KR102609244B1 - The Earth Leakage Detector for Distribution Panel that Installed in Distribution Panel - Google Patents

Abstract

The present invention is an earth leakage alarm for a distribution board installed in a distribution board. A plurality of zero-phase current transformers are installed in the distribution board where the earth leakage alarm is installed, and the earth leakage alarm receives the detected current from each of the plurality of zero-phase current transformers and displays the detected current value. An earth leakage alarm installed in a distribution panel that transmits information related to the detected current to an external computing device and transmits an alarm command to an external computing device or alarm device based on the detected current and the preset upper alarm limit. It's about.

Description

Earth Leakage Detector for Distribution Panel that Installed in Distribution Panel}

The present invention is an earth leakage alarm for a distribution board installed in a distribution board. A plurality of zero-phase current transformers are installed in the distribution board where the earth leakage alarm is installed, and the earth leakage alarm receives the detected current from each of the plurality of zero-phase current transformers and displays the detected current value. An earth leakage alarm installed in a distribution panel that transmits information related to the detected current to an external computing device and transmits an alarm command to an external computing device or alarm device based on the detected current and the preset upper alarm limit. It's about.

In modern society, as the use of electricity increases and the amount of wire usage also increases, the number of electric leakage accidents due to poor condition of the wire's coating is also increasing. Electrical leakage accidents are a major threat to modern people who use electricity, such as economic damage from power outages or human casualties from fires, and many engineers are currently developing methods to minimize damage from electric leakage accidents.

Conventional technology to minimize damage from electric leakage accidents involves detecting leakage current through a zero-phase current transformer (ZCT) in a switchboard and operating a circuit breaker to block the current. Specifically, when a high-current circuit equipped with a zero-phase current transformer and a circuit breaker is in a general balanced state, the current flowing in each phase is a balanced current, so the current detected from the zero-phase current transformer is 0 [A], but when a ground leak occurs, an unbalanced current is generated in each phase. The leakage current is detected in the zero-phase current transformer, and the circuit breaker is activated based on the detected leakage current.

In general, an earth leakage alarm that can warn of a leak in a circuit is mandatory in a switchboard or switchboard. However, in reality, electric leakage accidents mainly occur at single-phase loads of 30A or less in distribution boards, and when electric leakage occurs, the load is cut off without warning, causing a sudden power outage. In modern society, sudden power outages often cause work to stop or production lines to stop, resulting in significant losses in terms of time and money.

On the other hand, the conventional zero phase current transformer is not installed in the distribution board, but is installed in the distribution board as in Republic of Korea Patent No. 10-1657044, so it is difficult to determine the specific source of the leakage in the power line connected to which load. There is. In other words, even if a short circuit occurs in the power line for one load, the specific source cannot be found as described above, so all power flowing from the distribution board to other loads must be cut off, resulting in time and cost losses. People using the load will feel uncomfortable.

Therefore, there is a need to develop technology that can monitor leakage current for each load and predict dangerous leakage currents before the load is shut off to respond to leakage accidents.

Republic of Korea Patent No. 10-1657044 (2016.09.07.)

The present invention is an earth leakage alarm for a distribution board installed in a distribution board. A plurality of zero-phase current transformers are installed in the distribution board where the earth leakage alarm is installed, and the earth leakage alarm receives the detected current from each of the plurality of zero-phase current transformers and displays the detected current value. An earth leakage alarm installed in a distribution panel that transmits information related to the detected current to an external computing device and transmits an alarm command to an external computing device or alarm device based on the detected current and the preset upper alarm limit. The purpose is to provide.

In order to solve the above problems, in one embodiment of the present invention, there is an earth leakage alarm for a distribution board installed in a distribution board, wherein the distribution board includes a plurality of zero-phase current transformers installed in a power line, and the earth leakage alarm includes a first It includes a main board, a second main board, a first case, and a second case, wherein the first main board includes a plurality of signal input units that receive current detected from a plurality of image current transformers as signals in analog form; ADC converting the analog signals received by the plurality of signal input units into digital signals; a control unit that controls the operation of the earth leakage alarm for the distribution board based on the current value included in the digital signal; A communication port that transmits data on the current to an external computing device according to a set protocol so that the user can remotely monitor the detected current and information related to the operation of the earth leakage alarm; and an alarm device connection unit that transmits the alarm command generated by the control unit to an external alarm device. A display unit to display; and a switch that can change the channel by a user's input; and the second case includes a button that covers the switch so that the user can press and operate the switch. to provide.

In one embodiment of the present invention, one zero-phase current transformer is installed in each of the plurality of circuit breakers installed in the distribution board, and a first groove is formed along the edge of the front portion of the first case on which the first main board is mounted. The second case is coupled to the first case, and a second groove of a different shape from the first groove is formed on the rear portion of the first case, so that the first case and the DIN rail are coupled in a sliding manner, and A step is formed on the side of the second case so that the plurality of signal input units are connected to a plurality of phase current transformers, and the DIN rail can be installed inside the distribution panel by being fixed with rail bolts.

In one embodiment of the present invention, the second main board is coupled to be spaced apart in a form that covers the front surface of the first main board, and the second case is coupled in a form that covers the front surface of the second main board, and the display unit The area covering can allow the LED output from the display unit to be visible from the outside.

In one embodiment of the present invention, the display unit includes a first display unit and a second display unit, and the control unit is capable of controlling the display unit to a normal mode or setting mode according to a user's input, and operating in the normal mode. The display unit displays the channel selected by the user's input on the first display unit, and displays the current value detected for the corresponding channel on the second display unit, and the display unit operating in the setting mode displays the channel selected by the user's input on the first display unit. Displays the setting item selected by the user's input, and displays the setting value for the setting item on the second display unit, and the setting items include upper alarm limit value, operation delay time, presence of automatic return mode, automatic return delay time, and a communication address. The set value is set by user input and may include one or more of a current value, time, On/Off value, and address value.

In one embodiment of the present invention, the automatic return mode is turned On/Off by a user's input, and when the automatic return mode is Off, the detected current value exceeds the upper alarm limit and the operation delay time elapses. From this point until the user takes direct action, the control unit transmits an alarm command to the alarm device connection unit at preset times, and when the automatic reset mode is On, the detected current value exceeds the upper alarm limit and the operation delay time From this point on, the control unit transmits an alarm command to the alarm device connection unit at the preset time, but after the detected current value returns to the preset normal range and the automatic return delay time elapses, the control unit sends an alarm to the alarm device connection unit. It is possible to determine whether command transmission has been interrupted.

In one embodiment of the present invention, the upper alarm limit corresponds to the upper limit of the current set to enable response before a power outage due to leakage current occurs, and is lower than the current value that initiates the operation of the circuit breaker, and the operation delay time is detected. After the current value exceeds the alarm upper limit, it corresponds to the time until the control unit transmits an alarm command to the alarm device connection unit, and the automatic return delay time is the current value detected when the automatic return mode is On. This may correspond to the time until the control unit stops transmitting the alarm command to the alarm device connection unit after the upper alarm limit is exceeded and the alarm returns to the preset normal range.

In one embodiment of the present invention, the control unit includes a first confirmation step of checking whether the detected current value exceeds the upper alarm limit; A second confirmation step of checking whether the number of times that the amount of change in the current value continuously exceeds the preset standard for a preset unit time is more than the preset number of times; An alarm command transmission step of transmitting an alarm command to the alarm device connection unit based on the judgment result of one or more of the first confirmation step and the second confirmation step may be performed.

In one embodiment of the present invention, a step is formed on the side of the earth leakage alarm installed in the distribution board, so that the earth leakage alarm and the video current transformer are efficiently connected even in a narrow space, thereby minimizing the size of the earth leakage alarm and increasing the efficiency of the space inside the distribution board. It can have the desired effect.

In one embodiment of the present invention, the earth leakage alarm is coupled to the DIN rail in a sliding manner, and the DIN rail and the earth leakage alarm are fixedly installed inside the distribution panel through rail bolts, so that the user can easily repair or replace the earth leakage alarm installed in the distribution board. It can have the effect of enabling you to do so.

In one embodiment of the present invention, a zero-phase current transformer is installed in each of the plurality of power lines of the distribution board, so that the circuit breaker connected to the load where an electric leakage accident is predicted to occur is operated to block the electrical connection only for the corresponding load, and for the remaining loads. Electrical connections can be maintained as is, minimizing damage caused by short circuits.

In one embodiment of the present invention, when a dangerous level of current is detected from the zero phase current transformer before the circuit breaker starts operating, an alarm command is transmitted to the alarm device to warn the user in advance, so that the user can You can respond in advance and have the effect of stably operating the power system of the load.

In one embodiment of the present invention, the information related to the current detected from the zero phase current transformer and the operation of the earth leakage alarm is transmitted to an external computing device so that the user can remotely monitor the information, thereby providing convenience to the user. You can.

In one embodiment of the present invention, the trend of the detected current is identified and the alarm device is activated based on the current trend to enable the user to take action in advance, so that the user can take action in advance before an electric leakage accident occurs. This can have the effect of stably operating the power system of the corresponding load.

Figure 1 schematically shows the structure of a distribution panel in which a plurality of zero-phase current transformers are installed according to an embodiment of the present invention.
Figure 2 schematically shows the structure of a distribution board equipped with an earth leakage alarm according to an embodiment of the present invention.
Figure 3 schematically shows the components and connection method of an earth leakage alarm according to an embodiment of the present invention.
Figure 4 schematically shows the display of the front part and display part of the earth leakage alarm according to an embodiment of the present invention.
Figure 5 schematically shows a plurality of setting items according to an embodiment of the present invention.
Figure 6 schematically shows the execution process of the control unit depending on whether the automatic recovery mode is active or not according to an embodiment of the present invention.
Figure 7 schematically shows the steps performed by the control unit according to an embodiment of the present invention.
Figure 8 schematically shows the steps performed by the control unit according to another embodiment of the present invention.
Figure 9 schematically shows the amount of change in current detected for a preset unit time according to one embodiment and another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to facilitate a general understanding of one or more aspects. However, it will also be appreciated by those skilled in the art that this aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain example aspects of one or more aspects. However, these aspects are illustrative and some of the various methods in the principles of the various aspects may be utilized, and the written description is intended to encompass all such aspects and their equivalents.

Additionally, various aspects and features may be presented by a system that may include multiple devices, components and/or modules, etc. It is also understood that various systems may include additional devices, components and/or modules, etc. and/or may not include all of the devices, components, modules, etc. discussed in connection with the drawings. It must be understood and recognized.

As used herein, “embodiments,” “examples,” “aspects,” “examples,” etc. may not be construed to mean that any aspect or design described is better or advantageous over other aspects or designs. . The terms '~part', 'component', 'module', 'system', 'interface', etc. used below generally refer to computer-related entities, such as hardware, hardware, etc. A combination of and software, it can mean software.

Additionally, the terms “comprise” and/or “comprising” mean that the feature and/or element is present, but exclude the presence or addition of one or more other features, elements and/or groups thereof. It should be understood as not doing so.

Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term and/or includes any of a plurality of related stated items or a combination of a plurality of related stated items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are generally understood by those skilled in the art to which the present invention pertains. It has the same meaning as Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the embodiments of the present invention, have an ideal or excessively formal meaning. It is not interpreted as

Figure 1 schematically shows the structure of a distribution panel 1000 in which a plurality of phase current transformers 1200 are installed according to an embodiment of the present invention.

As shown in FIG. 1, the distribution board 1000 includes a plurality of circuit breakers 1100, and one zero-phase current transformer 1200 is installed on each power line connecting the circuit breaker 1100 and the load 2000.

In the distribution board 1000, a zero-phase current transformer 1200 is installed on the power line connecting the breaker 1100 and the load 2000, and the zero-phase current transformer 1200 reduces the leakage current generated for the load 2000. detect. That is, the zero-phase current transformer 1200 detects leakage current for the load 2000 assigned to it, and the circuit breaker 1100 assigned to the load 2000 operates based on the detected leakage current. Since a zero-phase current transformer is not installed inside a conventional distribution panel, leakage current cannot be detected for each load, so even if an electric leakage accident occurs in the distribution panel, it is difficult to find the load where the electric leakage accident occurred, and repair work for the leakage accident is often delayed.

Therefore, the present invention detects leakage current for each of a plurality of loads (2000) by installing a zero-phase current transformer (1200) on the power line connecting the load (2000) with the circuit breaker (1100) included in the distribution board (1000). This is a technical feature of the present invention.

In addition, in the conventional distribution panel 1000, when a short circuit occurs, the circuit breaker 1100 is activated and power is cut off, so people using the power device or power system suffer a lot of damage in terms of time and money due to a sudden power outage. .

Therefore, the present invention installs a zero-phase current transformer 1200 on the power line of the distribution board 1000 to detect leakage current occurring for each load 2000, and detects leakage current (current detected from the zero-phase current transformer 1200) based on the leakage current. A technical feature of the present invention is to provide an advance warning so that users can take action before an electric leakage accident occurs.

Meanwhile, preferably, the same number of zero-phase current transformers 1200 as the number of loads 2000 managed by the distribution board 1000 are installed in the distribution board 1000, and the zero-phase current transformers 1200 are connected to the circuit breaker 1100 and The power line connecting the load 2000 is installed in a penetrating manner.

Figure 2 schematically shows the structure of a distribution panel 1000 on which an earth leakage alarm 1300 is installed according to an embodiment of the present invention.

As shown in FIG. 2, an earth leakage alarm 1300 for a distribution board is installed in a distribution board 1000, wherein the distribution board 1000 includes a plurality of zero-phase current transformers 1200 installed in a power line, and the earth leakage alarm (1300) includes a first main board 1310, a second main board 1320, a first case 1330, and a second case 1340, and the first main board 1310 has a plurality of A plurality of signal input units 1311 that receive the current detected from the image current transformer 1200 as an analog signal; An ADC (1312) that converts the analog signals received by the plurality of signal input units (1311) into digital signals; A control unit 1313 that controls the operation of the earth leakage alarm 1300 for the distribution board based on the current value included in the digital signal; A communication port 1314 that transmits data on the current to an external computing device 3000 according to a set protocol so that the user can remotely monitor the detected current and information related to the operation of the earth leakage alarm 1300; And an alarm device connection unit 1315 that transmits the alarm command generated by the control unit 1313 to an external alarm device 4000. The second main board 1320 includes a plurality of video current transformers 1200, respectively. a display unit 1321 that displays the channel assigned to and the current value detected for the channel; and a switch 1322 that can change the channel by a user's input, wherein the second case 1340 covers the switch 1322 so that the user can press and operate the switch 1322. includes a button;

Specifically, the earth leakage alarm 1300 includes a first main board 1310 that analyzes the current detected from the video current transformer 1200 and informs the user, and a second main board 1320 that displays the detected current.

The first main board 1310 includes a signal input unit 1311, an ADC 1312, a control unit 1313, a communication port 1314, and an alarm device connection unit 1315, and each device is connected by wire or wirelessly. Can communicate with other devices.

The signal input unit 1311 receives the current detected from the image current transformer 1200 as an analog signal. More specifically, the first main board 1310 includes a plurality of signal input units 1311 and receives currents detected from a plurality of image current transformers 1200 through the plurality of signal input units 1311.

The ADC 1312 converts the analog signal received by the signal input unit 1311 into a digital signal so that the control unit 1313 can easily process it.

The control unit 1313 receives the current converted into a digital signal from the ADC 1312, analyzes the current, and controls the operation of the earth leakage alarm 1300. More specifically, the current detected from the zero phase current transformer 1200 is a leakage current, and the control unit 1313 checks whether the leakage current is safe through a plurality of confirmation steps, and sends the alarm device connection unit 1315 according to whether it is safe. Send an alarm command.

The communication port 1314 provides information related to the detected current and the operation of the leakage alarm 1300 so that the user can remotely monitor information about the leakage current through the external computing device 3000. 3000) is transmitted according to the protocol set. As an embodiment of the present invention, the communication port 1314 uses the RS-485 communication protocol, which is one of serial communication, to transmit information to the earth leakage alarm 1300 and an external computing device 3000 located at a long distance. Available.

The alarm device connection unit 1315 transmits the alarm command received from the control unit 1313 to the external alarm device 4000. The alarm device connection unit 1315 can be connected to the external alarm device 4000 wirelessly or wired.

The alarm device 4000 is an alarm system that provides an alarm so that users can quickly recognize an electric leakage accident, and includes a buzzer or LED. The alarm device 4000 in another embodiment of the present invention may further include an external computing device 3000 or a terminal, and may enable the user to quickly recognize the corresponding alarm by sending a message, etc.

The second main board 1320 includes a display unit 1321 and a switch 1322, and each device can communicate electrical signals with the control unit 1313 connected by wire.

The display unit 1321 displays information on leakage current in real time so that the user can easily check the leakage current detected for each load 2000. Preferably, the information displayed by the display unit 1321 and the data on leakage current transmitted to the external computing device 3000 through the communication port 1314 at the same time are the same, so that the user can avoid a leakage accident while looking at the display unit 1321. can be recognized or predicted. In addition, the display unit 1321 operates in a normal mode or a setting mode and displays different information for each mode, and a detailed description of the information displayed by the display unit 1321 will be described later with reference to FIG. 4.

The switch 1322 is operated by the user's input and transmits the user's desired command to the control unit 1313. The user can check the current detected from each of the plurality of phase current transformers 1200 through input to the switch 1322, or operate the earth leakage alarm 1300 in normal mode or setting mode. Meanwhile, in one embodiment of the present invention, the switch 1322 corresponds to a push switch, and in another embodiment of the present invention, the switch 1322 is used by the user using the earth leakage alarm 1300. Depending on convenience, various switches such as a toggle switch, rotary switch, and touch switch may be included, and the user can easily operate the earth leakage alarm 1300 depending on the type of the switch. It is desirable that the shapes of the buttons covering the switches are also different so that this can be done.

Figure 3 schematically shows the components and connection method of the earth leakage alarm 1300 according to an embodiment of the present invention.

As shown in FIG. 3, one zero-phase current transformer 1200 is installed in each of the plurality of circuit breakers 1100 installed in the distribution board 1000, and the first case (1310) is mounted on the first main board 1310. 1330) A first groove 1331 is formed along the edge of the front part so that the second case 1340 is coupled to the first case 1330, and the second case 1340 is attached to the rear part of the first case 1330. A second groove 1332 of a different shape from the first groove 1331 is formed so that the first case 1330 and the DIN rail 5000 are coupled in a sliding manner, and the side portion of the second case 1340 has a step. The plurality of signal input units 1311 are connected to the plurality of phase current transformers 1200, and the DIN rail 5000 is installed inside the distribution board 1000 by being fixed with rail bolts.

In addition, the second main board 1320 is spaced apart and coupled in a way that covers the front surface of the first main board 1310, and the second case 1340 covers the front surface of the second main board 1320. It is combined in a shape, and the area covering the display unit 1321 allows the LED output from the display unit 1321 to be visible from the outside.

Schematically, Figure 3 (a) shows the components and connection method of the earth leakage alarm 1300, and Figure 3 (b) shows the external appearance of the earth leakage alarm 1300 to which the DIN rail 5000 is coupled.

Specifically, Figure 3(a) shows the schematic components and connection method of the earth leakage alarm 1300.

The first main board 1310 is mounted on the first case 1330, and the second main board 1320 is spaced apart and coupled to cover the first main board 1310. More specifically, the first main board 1320 is coupled to the first case 1330. The signal input unit 1311, communication port 1314, and alarm device connection unit 1315 included in the main board 1310 are each connected by wire to the video current transformer 1200, the external computing device 3000, and the alarm device 4000. When connected, the second main board 1320 is combined with the first main board 1310 so as not to interfere with the corresponding wired connection.

The second case 1340 is combined with the first case 1330 to cover the first main board 1310 and the second main board 1320. More specifically, a first groove 1331 is formed along the edge of the front portion of the first case 1330 as shown in (a) of FIG. 3 to separate the first case 1330 and the second case 1340. ) is stably combined.

In addition, a step is formed on the side surface of the second case 1340 as shown in (a) of FIG. 3, so that a plurality of signal input units 1311 can be connected to a plurality of image current transformers 1200, and communication The port 1314 can be connected to the external computing device 3000, and the alarm device connection unit 1315 can be connected to the external alarm device 4000, which has the effect of increasing the efficiency of the space inside the distribution board 1000. It can be.

Additionally, the interior of the second case 1340 is made up of empty space so that the first main board 1310 and the second main board 1320 do not physically interfere with the second case 1340. Prevents a situation in which an error occurs due to physical interference in the earth leakage alarm (1300).

Figure 3(b) shows a method of combining the earth leakage alarm 1300 and the DIN rail 5000. Specifically, a second groove 1332 is formed on the rear portion of the first case 1330 so that the DIN rail 5000 can be coupled to it, as shown in (b) of FIG. 3. The earth leakage alarm (1300) is coupled to the DIN rail (5000) in a sliding manner through the second groove (1332), and the DIN rail (5000) is installed and fixed inside the distribution board (1000) through rail bolts, and is installed to prevent earth leakage. The alarm 1300 is also fixed and coupled to the DIN rail 5000 through a rail bolt, so when the user wants to repair the earth leakage alarm 1300, the earth leakage alarm 1300 can be easily separated from the distribution board 1000. .

Meanwhile, the width or length of the earth leakage alarm 1300 and the DIN rail 5000 shown in (b) of FIG. 3 are one embodiment of the present invention, and can be changed as another embodiment of the present invention according to the user's needs. there is.

Figure 4 schematically shows the display of the front part and display part 1321 of the earth leakage alarm 1300 according to an embodiment of the present invention.

As shown in FIG. 4, the display unit 1321 includes a first display unit and a second display unit, and the control unit 1313 controls the display unit 1321 to the normal mode or setting mode according to the user's input. The display unit 1321 operating in the normal mode displays the channel selected by the user's input on the first display unit, displays the current value detected for the corresponding channel on the second display unit, and sets the The display unit 1321 operating in the mode displays the setting item selected by the user's input on the first display unit and the setting value for the corresponding setting item on the second display unit, and the setting item includes an upper alarm limit value, It includes one or more of operation delay time, automatic return mode, automatic return delay time, and communication address, and the setting value is set by user input, and includes current value, time, On/Off value, and address value. Includes 1 or more of:

Schematically, (a) of FIG. 4 shows the front part of the earth leakage alarm 1300, and (b) of FIG. 4 shows the display of the display unit 1321.

Specifically, the second case 1340 has a hole formed so that each terminal of the signal input unit 1311, the communication port 1314, and the alarm device connection unit 1315 included in the first main board 1310 is connected to an earth leakage alarm. It is exposed at the front of 1300, and by connecting the terminals of the zero-phase current transformer 1200 and the signal input unit 1311 with a wire, the earth leakage alarm 1300 receives the current detected from the zero-phase current transformer 1200. As shown in (a) of FIG. 4, each phase current transformer 1200 is connected to two terminals (S (Source) and L (Load)), and is connected to the distribution panel 1000 through a plurality of signal input units 1311. ) A plurality of video current transformers (1200) and an earth leakage alarm (1300) installed in the unit can be connected at the same time. On the front of the earth leakage alarm 1300, the channel (CH) assigned to the video current transformer 1200 and the current value (mA) detected in the video current transformer 1200 are displayed by the display unit 1321, and the user inputs a button. You can check the current value detected for each of the plurality of channels in real time.

In addition, the display unit 1321 can operate in normal mode or setting mode according to the user's button input (SET button in Figure 4 (a)), and when operating in normal mode, it displays the above-mentioned channel and current value.

FIG. 4(b) exemplarily shows LEDs displayed on the first display unit and the second display unit included in the display unit 1321 when the display unit 1321 operates in the setting mode. In one embodiment of the present invention, the first display unit and the second display unit are 7-segment FND, and the first display unit displays HI when the user sets the upper alarm limit, On when the operation delay time is set, and oF when the automatic return delay time is set. , when setting the automatic reset mode, rt is output, and when setting the communication address, Id is output. The setting value set by the user can be displayed as a number or On/OFF on the second display, and the user can display the setting value within the preset setting range. It can be set as a setting value.

Preferably, the address value set when the user sets the communication address corresponds to the communication address of the device for the set protocol communication.

Meanwhile, the button (blue circle) shown in Figure 4 (a) is an embodiment of the present invention, and the functions of the SET button include entering the setting mode, selecting setting items, moving the setting value digits, and saving the setting value. The functions of the up button (▲) include starting to change the setting value of the setting item, increasing the setting value, etc., and the functions of the down button (▼) may include ending the setting while selecting the setting item, decreasing the setting value, etc. .

More preferably, as described above in FIG. 2, the button covers the switch 1322 for the user's convenience, and the functions included in each of the above-described SET button, up button, and down button are the switch 1322. ) corresponds to the function of

Figure 5 schematically shows a plurality of setting items according to an embodiment of the present invention.

As shown in Figure 5, the upper alarm limit corresponds to the upper limit of the current set to enable response before a power outage due to leakage current occurs, is lower than the current value that initiates the operation of the circuit breaker 1100, and the operation delay is The time corresponds to the time until the control unit 1313 transmits an alarm command to the alarm device connection unit 1315 after the detected current value exceeds the upper alarm limit, and the automatic return delay time is the automatic return mode. When is On, the detected current value exceeds the upper alarm limit and returns to the preset normal range, and corresponds to the time until the control unit 1313 stops transmitting the alarm command to the alarm device connection unit 1315.

Specifically, the present invention is to minimize economic losses due to power outages when the breaker 1100 is operated, before a power outage occurs, that is, when the current detected from the zero-phase current transformer 1200 starts to operate the breaker 1100. A technical feature of the present invention is that by providing a warning to the user before the current reaches the user, the user can recognize the occurrence of a potential electrical leak in the corresponding load 2000 and take action in advance.

Therefore, as shown in (a) of FIG. 5, the upper alarm limit is set lower than the starting current of the circuit breaker 1100, and when the current value detected from the zero-phase transformer 1200 exceeds the upper alarm limit, an alarm is sent to the user. Be able to provide it. Meanwhile, in one embodiment of the present invention, the upper alarm limit may be set to 80% to 90% of the starting current of the circuit breaker 1100, and the upper alarm limit may be set differently based on various environmental factors.

In addition, when the switch 1322 of the circuit or load 2000 is turned on or off, when components such as capacitors that are sensitive to changes in current are used to stabilize power supply, when there is an environmental change such as temperature or humidity, or when the power supply The leakage current may temporarily increase due to various factors, such as when the power is suddenly cut off and then supplied again. However, the leakage current, which increases for a short moment due to the above-mentioned situation and then returns to within the normal range, does not pose a significant risk to the load (2000). However, when an alert is provided to the user regarding such leakage current, the user may feel fatigued in response to the alert.

Therefore, as shown in (b) of FIG. 5, the present invention sets an operation delay time, and the control unit 1313 detects leakage current exceeding the upper alarm limit for a time shorter than the operation delay time. 1315) to avoid sending the alarm command. However, if the current value detected from the zero phase current transformer 1200 still exceeds the upper alarm limit even after the operation delay time has elapsed, the control unit 1313 starts transmitting an alarm command to the alarm device connection unit 1315.

Meanwhile, in one embodiment of the present invention, the control unit 1313 transmits an alarm command to the alarm device connection unit 1315 at preset times so that the alarm device 4000 periodically provides an alarm, while in other embodiments of the present invention In the example, the control unit 1313 continuously transmits alarm commands to the alarm device connection unit 1315, so that the alarm device 4000 can continuously provide alarms.

In addition, if the current value detected from the zero-phase current transformer 1200 exceeds the upper alarm limit and then automatically returns to within the preset normal range, no user action is required, so there is no need to provide an alarm to the user. . However, it also frequently occurs that the detected current value falls below the upper alarm limit and then quickly exceeds the upper alarm limit again. Therefore, the control unit 1313 does not stop transmitting the alarm command to the alarm device connection unit 1315 as soon as the detected current value falls below the upper alarm limit, but sets an automatic return delay time so that the detected current value is lowered below the upper alarm limit. If it falls below the upper alarm limit and is still below the upper alarm limit even after the automatic recovery delay time has passed, the control unit 1313 stops transmitting the alarm command to the alarm device connection unit 1315.

In this way, by providing an operation delay time and an automatic return delay time before the control unit 1313 operates for the leakage current detected from the zero-phase current transformer 1200, the safety of operating the distribution panel 1000 is improved and user convenience is improved. Height can be effective.

Figure 6 schematically shows the execution process of the control unit 1313 depending on whether the automatic recovery mode is active or not according to an embodiment of the present invention.

As shown in FIG. 6, the automatic return mode is turned on/off by the user's input, and when the automatic return mode is Off, the detected current value exceeds the upper alarm limit and the operation delay time has elapsed. From this point until the user takes direct action, the control unit 1313 transmits an alarm command to the alarm device connection unit 1315 at preset times, and when the automatic return mode is On, the detected current value exceeds the upper alarm limit. From the point where the operation delay time has passed, the control unit 1313 transmits an alarm command to the alarm device connection unit 1315 at each preset time, and the automatic reset occurs after the detected current value returns to within the preset normal range. After the delay time has elapsed, the control unit 1313 stops transmitting the alarm command to the alarm device connection unit 1315.

Schematically, Figure 6(a) shows the execution process of the control unit 1313 when the automatic restoration mode is in the Off state, and Figure 6(b) shows the execution process of the control unit 1313 when the automatic restoration mode is On. Show the process.

Specifically, when the detected current exceeds the upper alarm limit and the control unit 1313 starts transmitting the alarm command after the operation delay time has elapsed, the alarm device 4000 provides an alarm to the user. As described above in FIG. 5, in one embodiment of the present invention, an alarm command is transmitted to the alarm device 4000 at preset times, and the alarm device 4000 also generates an alarm at each preset time based on the transmitted alarm. Outputs .

When the automatic return mode is in the Off state due to the user's input, as shown in (a) of FIG. 6, the current value detected from the zero-phase current transformer 1200, which exceeded the upper alarm limit, falls below the upper alarm limit and returns to the preset normal range. Even if the user returns to the room, the control unit 1313 continues to transmit the alarm command. However, if the user directly takes action to stop the alarm, the control unit 1313 stops transmitting the alarm command. At this time, the control unit 1313 operates by prioritizing the input of the user's action regardless of the comparison result between the detected current value and the upper alarm limit value.

Meanwhile, when the automatic return mode is in the On state due to the user's input, the control unit 1313 stops transmitting the alarm command without user intervention, as shown in (b) of FIG. 6. More specifically, the current value detected from the zero-phase current transformer 1200, which exceeded the upper alarm limit, falls below the upper alarm limit, and after the automatic return delay time has elapsed, the control unit 1313 stops transmitting the alarm command.

Figure 7 schematically shows the execution steps of the control unit 1313 according to an embodiment of the present invention.

As shown in FIG. 7, the control unit 1313 performs a first confirmation step (S100) of checking whether the detected current value exceeds the upper alarm limit; A second confirmation step (S200) of checking whether the number of times that the amount of change in the current value continuously exceeds the preset standard for a preset unit time is more than the preset number of times; An alarm command transmission step (S300) of transmitting an alarm command to the alarm device connection unit 1315 based on the judgment results of one or more of the first confirmation step (S100) and the second confirmation step (S200) is performed.

Specifically, the first confirmation step (S100) is performed by the control unit 1313 and checks whether the current value detected from the zero phase current transformer 1200 exceeds the preset upper alarm limit. If the detected current value exceeds the upper alarm limit, the control unit 1313 determines that the probability of an electric leakage accident occurring is high.

The second confirmation step (S200) is performed by the control unit 1313 when the detected current value is below the upper alarm limit as a result of the determination of the first confirmation step (S100), and the detected current value for a preset unit time The amount of change is calculated, and when the amount of change in the corresponding current value for the preset unit time exceeds the preset standard continuously occurs, and the number of consecutive occurrences is more than the preset number, the control unit 1313 detects It is determined that the increasing trend of the detected current value is strong, and it is predicted that the detected current value will exceed the upper alarm limit.

The alarm command transmission step (S300) is performed by the control unit 1313, and is sent to the alarm device connection unit 1315 based on the judgment result of one or more of the first confirmation step (S100) and the second confirmation step (S200). Send an alarm command. Meanwhile, if it is determined that the detected current is not dangerous as a result of the determination in the first confirmation step (S100) and the second confirmation step (S200), the control unit 1313 repeatedly performs the above-described process to prevent an electric leakage accident. It can have a safe prevention effect.

Figure 8 schematically shows the execution steps of the control unit 1313 according to another embodiment of the present invention.

As another embodiment of the present invention, as shown in FIG. 8, the control unit 1313 further performs a third confirmation step, a first confirmation step to check whether the detected current value exceeds the upper alarm limit. (S100); A second confirmation step (S200) of checking whether the number of times that the amount of change in the current value continuously exceeds the preset first standard for a preset unit time is more than the preset number of times; With respect to the total of a plurality of current values detected from a plurality of current transformers 1200 installed in the distribution board 1000, the number of times that the amount of change in the current value for a preset unit time continuously exceeds the preset second standard is preset. A third confirmation step to check whether the number is more than the number of times; And an alarm command transmission step (S300) of transmitting an alarm command to the alarm device connection unit 1315 based on the judgment result of one or more of the first confirmation step (S100), the second confirmation step (S200), and the third confirmation step. ); can be performed.

The third confirmation step may be performed by the control unit 1313 when it is determined that the increasing trend of the current value detected from the zero phase current transformer 1200 is not strong as a result of the determination of the second confirmation step (S200). Specifically, the third confirmation step calculates the total of a plurality of current values detected from a plurality of current transformers 1200 installed in the distribution board 1000, and the amount of change in the total of the plurality of current values with respect to a preset unit time. When cases exceeding the preset second standard occur continuously and the number of consecutive occurrences is greater than the preset number, the control unit 1313 increases the leakage current for the entire load 2000 managed by the distribution board 1000. It is determined that the trend is strong and it is predicted that the value of the leakage current will exceed the preset upper alarm limit.

In addition, as another embodiment of the present invention, the control unit 1313 may further perform a fourth confirmation step, and the fourth confirmation step is a preset number of consecutive occurrences as a result of the determination of the third confirmation step. If it is less than the number of times, it may be performed by the control unit 1313. The fourth confirmation step determines whether the ratio of the number of times the current value increases and the number of times the current value decreases for a preset unit time for a certain period of time exceeds the preset third standard, and determines whether the current detected from the zero-phase transformer 1200 It is possible to predict whether the value will exceed the upper alarm limit. Specifically, when the number of times the current value increases is greater than the number of times the current value decreases, and the ratio exceeds the preset third standard, the control unit 1313 determines that the leakage current detected from the zero phase current transformer 1200 is If it is determined that the upper alarm limit will be exceeded, the alarm command transmission step (S300) is performed.

Meanwhile, as an example of the present invention, the first confirmation step (S100), the second confirmation step (S200), and the third confirmation step were performed in time series order as shown in FIG. 8, but in another embodiment of the present invention, The first confirmation step (S100), the second confirmation step (S200), and the third confirmation step are performed simultaneously and independently of each other, so that the alarm command transmission step (S300) is determined as a result of the first confirmation step (S100), If there is a risk of electric leakage accident as a result of one or more of the judgment results of the second confirmation step (S200) and the judgment results of the third confirmation step, the control unit 1313 performs the alarm command transmission step (S300). .

Figure 9 schematically shows the amount of change in current detected for a preset unit time according to one embodiment and another embodiment of the present invention.

Schematically, Figure 9 (a) shows the performance process of the first confirmation step (S100), Figure 9 (b) shows the performance process of the second confirmation step (S200), and Figure 9 (c) ) shows the performance process of the third confirmation step.

Figure 9(a) schematically shows the execution process of the first confirmation step (S100). The first confirmation step (S100) checks whether the current value detected from the zero phase current transformer 1200 exceeds the upper alarm limit.

Figure 9(b) exemplarily shows the execution process of the second confirmation step (S200) assuming that the preset number of times is 4. Specifically, for a unit time that is all preset to the same time, such as t ₂ -t ₁ , t ₃ -t ₂ , t ₄ -t ₃ , and t ₅ -t ₄ , the current value detected from the zero-phase transformer 1200 When the amount of change (A ₂ -A ₁ /t ₂ -t ₁ ) exceeds the preset first standard, the control unit 1313 records the image for the subsequent preset unit time through the second confirmation step (S200). The amount of change in the current value detected from the current transformer 1200 (A ₃ -A ₂ /t ₃ -t ₂ , A ₄ -A ₃ /t ₄ -t ₃ , A ₅ -A ₄ /t ₅ -t ₄ ) is as described above. Check whether the preset first standard is continuously exceeded, and as a result of the confirmation, A ₂ -A ₁ /t ₂ -t ₁ , A3-A ₂ /t ₃ -t ₂ , A ₄ -A ₃ /t ₄ -t ₃ , A ₅ -A ₄ /t ₅ -t ₄ If the values all exceed the preset first standard, the leakage current detected from the corresponding zero phase current transformer 1200 is judged to be dangerous and the alarm command transmission step (S300) is performed. Perform.

Figure 9(c) exemplarily shows the execution process of the third confirmation step under the assumption that the preset number of times is 4. Through the third confirmation step, the control unit 1313 sums up all the plurality of leakage currents detected from the plurality of image current transformers 1200 (channel 1, channel 2, and channel 3) (channel 1 + channel 2 + channel 3). )do. As described above in (b) of FIG. 9, for a unit time that is all set to the same time, such as t ₂ -t ₁ , t ₃ -t ₂ , t ₄ -t ₃ , and t ₅ -t ₄ , a plurality of When the amount of change in current value (S ₂ -S ₁ /t ₂ -t ₁ ) detected from the zero phase current transformer 1200 exceeds the preset second standard, the control unit 1313 performs a second confirmation step (S200). Through this, the amount of change in the current value detected from the zero phase current transformer 1200 for the subsequent preset unit time (S ₃ -S ₂ /t ₃ -t ₂ , S ₄ -S ₃ /t ₄ -t ₃ , S ₅ - Check whether S ₄ /t ₅ -t ₄ ) continuously exceeds the preset second standard, and as a result of the confirmation, S ₂ -S ₁ /t ₂ -t ₁ , S3-S ₂ /t ₃ -t ₂ , S ₄ -S ₃ /t ₄ -t ₃ , S ₅ -S ₄ /t ₅ -t ₄ all exceed the preset second standard, the leakage current detected from the corresponding zero phase current transformer 1200 is considered dangerous. After making the decision, the alarm command transmission step (S300) is performed.

As described above, the earth leakage alarm 1300 can exert the effect of increasing the stability of the load 2000 against earth leakage accidents by precisely performing a plurality of verification steps and monitoring leakage current.

In one embodiment of the present invention, a step is formed on the side of the earth leakage alarm installed in the distribution board, so that the earth leakage alarm and the video current transformer are efficiently connected even in a narrow space, thereby minimizing the size of the earth leakage alarm and increasing the efficiency of the space inside the distribution board. It can have the desired effect.

In one embodiment of the present invention, the earth leakage alarm is coupled to the DIN rail in a sliding manner, and the DIN rail and the earth leakage alarm are fixedly installed inside the distribution panel through rail bolts, so that the user can easily repair or replace the earth leakage alarm installed in the distribution board. It can have the effect of enabling you to do so.

In one embodiment of the present invention, a zero-phase current transformer is installed in each of the plurality of power lines of the distribution board, so that the circuit breaker connected to the load where an electric leakage accident is predicted to occur is operated to block the electrical connection only for the corresponding load, and for the remaining loads. Electrical connections can be maintained as is, minimizing damage caused by short circuits.

In one embodiment of the present invention, when a dangerous level of current is detected from the zero phase current transformer before the circuit breaker starts operating, an alarm command is transmitted to the alarm device to warn the user in advance, so that the user can You can respond in advance and have the effect of stably operating the power system of the load.

In one embodiment of the present invention, the information related to the current detected from the zero phase current transformer and the operation of the earth leakage alarm is transmitted to an external computing device so that the user can remotely monitor the information, thereby providing convenience to the user. You can.

In one embodiment of the present invention, the trend of the detected current is identified and the alarm device is activated based on the current trend to enable the user to take action in advance, so that the user can take action in advance before an electric leakage accident occurs. This can have the effect of stably operating the power system of the corresponding load.

As described above, although the embodiments have been described with limited examples and drawings, various modifications and variations can be made by those skilled in the art from the above description. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent. Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the claims described below.

1000: Distribution board
1100: circuit breaker 1200: video current transformer
1300: Earth leakage alarm
1310: First main board
1311: signal input unit 1312: ADC
1313: Control unit 1314: Communication port
1315: Alarm device connection part
1320: 2nd main board
1321: display unit 1322: switch
1330: Case 1
1331: 1st home 1332: 2nd home
1340: Case 2
2000: Load
3000: External computing device
4000: Alarm device
5000: DIN Rail

Claims (7)

As an earth leakage alarm for a distribution board installed in a distribution board,
The distribution board includes a plurality of zero phase current transformers installed on the power line,
The earth leakage alarm is,
Includes a first main board, a second main board, a first case, and a second case,
The first main board is,
A plurality of signal input units that receive current detected from a plurality of image current transformers as analog signals;
ADC converting the analog signals received by the plurality of signal input units into digital signals;
a control unit that controls the operation of the earth leakage alarm for the distribution board based on the current value included in the digital signal;
A communication port that transmits data on the current to an external computing device according to a set protocol so that the user can remotely monitor the detected current and information related to the operation of the earth leakage alarm; and
It includes an alarm device connection unit that transmits the alarm command generated by the control unit to an external alarm device,
The second main board is,
a display unit that displays channels assigned to each of the plurality of image current transformers and current values detected for the corresponding channels; and
Includes a switch that can change the channel by user input,
The second case includes a button that covers the switch so that the user can press and operate the switch.
In claim 1,
One zero phase current transformer is installed in each of the plurality of circuit breakers installed in the distribution board,
A first groove is formed along the edge of the front portion of the first case on which the first motherboard is mounted, so that the second case is coupled to the first case,
A second groove of a different shape from the first groove is formed on the rear portion of the first case, so that the first case and the DIN rail are coupled in a sliding manner,
A step is formed on a side portion of the second case so that the plurality of signal input units are connected to a plurality of image current transformers,
The DIN rail is an earth leakage alarm for a distribution panel that is installed inside the distribution panel by being fixed with rail bolts.
In claim 1,
The second main board is spaced apart and coupled to cover the front surface of the first main board,
The second case is coupled to cover the front of the second main board, and the area covering the display unit allows the LED output from the display unit to be visible from the outside.
In claim 1,
The display unit includes a first display unit and a second display unit,
The control unit can control the display unit in normal mode or setting mode according to user input,
The display unit operating in the normal mode,
Displaying a channel selected by a user's input on the first display unit and displaying a current value detected for the corresponding channel on the second display unit,
The display unit operating in the setting mode,
Displaying a setting item selected by a user's input on the first display unit, and displaying a setting value for the setting item on the second display unit,
The setting items include one or more of the alarm upper limit value, operation delay time, automatic return mode, automatic return delay time, and communication address,
The set value is set by user input and includes one or more of current value, time, On/Off value, and address value.
In claim 4,
The automatic return mode is turned on/off by user input.
When the automatic reset mode is Off, the control unit transmits an alarm command to the alarm device connection unit at preset times from the time the detected current value exceeds the upper alarm limit and the operation delay time has passed until the user takes direct action. do,
When the automatic reset mode is On, the detected current value exceeds the upper alarm limit and the control unit transmits an alarm command to the alarm device connection unit at the preset time from the point when the operation delay time has elapsed, and the detected current value An earth leakage alarm for a distribution panel in which the control unit stops transmitting an alarm command to the alarm device connection unit when the automatic return delay time has elapsed after returning to the preset normal range.
In claim 5,
The upper alarm limit corresponds to the upper limit of the current set to enable response before a power outage due to leakage current occurs, and is lower than the current value that initiates the operation of the circuit breaker,
The operation delay time corresponds to the time from when the detected current value exceeds the upper alarm limit until the control unit transmits an alarm command to the alarm device connection unit,
The automatic return delay time is the time until the control unit stops transmitting the alarm command to the alarm device connection unit after the current value detected when the automatic reset mode is On exceeds the upper alarm limit and returns to the preset normal range. Corresponding to the earth leakage alarm for the distribution panel.
In claim 4,
The control unit,
A first confirmation step of checking whether the detected current value exceeds the upper alarm limit;
A second confirmation step of checking whether the number of times that the amount of change in the current value continuously exceeds the preset standard for a preset unit time is more than the preset number of times;
An earth leakage alarm for a distribution panel that performs an alarm command transmission step of transmitting an alarm command to the alarm device connection unit based on the judgment result of one or more of the first confirmation step and the second confirmation step.