KR102539108B1 - Intelligent electronic device with diagnostic and monitoring functions - Google Patents

Abstract

The present invention relates to an intelligent electronic device, comprising: an environmental sensor for detecting the various environmental information of components of a power device; an analog interface for converting current and voltage detected as analog signals into digital signals, and converting analog signals among the information detected by the environmental sensor into digital signals; a digital input/output unit for receiving the state information of a circuit breaker and receiving digital signals among the information detected by the environmental sensor; a control unit for controlling the circuit breaker according to the digital signals input through the analog interface and the digital input/output unit, and inspecting the state of the components constituting the power device; and a display unit for displaying the state of the circuit breaker and the inspection result of the components.

Description

Intelligent electronic device with diagnostic and monitoring functions}

The present invention relates to an intelligent electronic device having a diagnosis and monitoring function, and more particularly, to an intelligent electronic device capable of diagnosing and monitoring the state of a power device.

In general, power devices such as switchgear include a circuit breaker capable of selectively cutting off the supply of power as needed. It is necessary to prevent power outages by detecting the state of the circuit breaker and the state of the distribution line to control the precise operation of the circuit breaker.

As such, an intelligent electronic device (IED) has been introduced as a device for detecting and controlling the state of a circuit breaker.

Currently, the function of an intelligent electronic device is used as a role of diagnosing a circuit breaker, such as Patent Publication No. 10-2019-0116735 (published on October 15, 2019, circuit breaker diagnosis device and method using an intelligent electronic device).

As in the prior art, an intelligent electronic device is used as a means capable of providing a trip signal to enable normal operation of a circuit breaker by detecting circuit breaker state information and line current information.

In the prior art, there was a limitation in that only the circuit breaker state was detected and other state or monitoring information of the circuit breaker could not be processed.

For example, a high-voltage vacuum circuit breaker (VCB) using a vacuum interrupter (VI) can supply power with good conductors normally, and quickly cut off large currents in the event of overload or short circuit to monitor devices that must secure insulation. can't

A high-voltage vacuum circuit breaker (VCB) must maintain a specific vacuum level for breaking operation in case of overload or short circuit, but since a monitoring device other than an intelligent electronic device must be used to monitor this, a distributed monitoring system for monitoring power devices is using

Such a distributed monitoring system not only separates in terms of cost, but also has a problem in that work efficiency deteriorates because each monitoring device must be checked individually and the inspection must also be performed on each.

An object to be solved by the present invention in consideration of the above problems is to provide an intelligent electronic device capable of diagnosing and monitoring by integrating various monitoring target elements of a power device.

An intelligent electronic device of the present invention for solving the above technical problem is an environmental sensor for detecting various environmental information of components of a power device, and converting current and voltage detected as analog signals into digital signals, and the environmental sensor An analog interface for converting an analog signal into a digital signal among information detected by the circuit breaker, a digital input/output unit for receiving state information of a circuit breaker and a digital input/output unit for receiving a digital signal among information detected by the environmental sensor, the analog interface and digital input/output It may include a control unit that controls the circuit breaker according to digital signals input through the unit and checks the state of the components constituting the power device, and a display unit that displays the state of the circuit breaker and the inspection result of the components.

In an embodiment of the present invention, a communication unit for transmitting the state of the circuit breaker and inspection results of components may be further included.

In an embodiment of the present invention, the environmental sensor may include a vacuum sensor for detecting a vacuum level of a vacuum circuit breaker of a power device.

In an embodiment of the present invention, the environmental sensor includes internal temperature sensors for detecting the temperature of each component inside the power device, and an external temperature sensor for detecting the outside temperature of the power device, and the control unit includes each of the components. It is possible to monitor the possibility of fire and estimate the remaining life of the component using the temperature of the outside air and the temperature of the outside air.

In an embodiment of the present invention, the environmental sensor, including a partial discharge sensor, may monitor deterioration of the insulation of the power device in the control unit.

The intelligent electronic device of the present invention collects various status data of power devices in addition to monitoring the state of circuit breakers of power devices, and performs diagnosis using this, thereby unifying the diagnosis and monitoring system of power devices, thereby providing convenience and reliability. has the effect of increasing

1 is a block diagram of an intelligent electronic device according to a preferred embodiment of the present invention.
FIG. 2 is a block configuration diagram of the environment sensor in FIG. 1 .
3 is a flowchart of one embodiment of a method for monitoring a power device using the present invention.
4 is a detailed flowchart of step S50.
5 is a detailed flowchart of step S60.

In order to fully understand the configuration and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be implemented in various forms and various changes may be made. However, the description of the present embodiment is provided to complete the disclosure of the present invention and to completely inform those skilled in the art of the scope of the invention to which the present invention belongs. In the accompanying drawings, the size of the components is enlarged from the actual size for convenience of description, and the ratio of each component may be exaggerated or reduced.

Terms such as 'first' and 'second' may be used to describe various elements, but the elements should not be limited by the above terms. The above terms may only be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a 'first element' may be named a 'second element', and similarly, a 'second element' may also be named a 'first element'. can Also, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms used in the embodiments of the present invention may be interpreted as meanings commonly known to those skilled in the art unless otherwise defined.

Hereinafter, an intelligent electronic device according to a preferred embodiment of the present invention will be described with reference to the drawings.

1 is a block diagram of an intelligent electronic device according to an embodiment of the present invention.

Referring to FIG. 1, the intelligent electronic device of the present invention includes an analog interface 10 for receiving analog signals such as current and voltage according to the state of a circuit breaker of a power device, and a digital signal for detecting the state of the circuit breaker and controlling its operation. A digital input/output unit 20 that outputs, an environment sensor 30 that detects and inputs environmental information of components constituting the power device through the analog interface 10 or the digital input/output unit 20, and the received The control unit 40 that controls the operation of the circuit breaker according to the analog signal and the digital signal and diagnoses the components, the display unit 50 that displays the diagnosis result of the control unit 40, and the diagnosis result of the control unit 40 It may be configured to include a communication unit 60 that transmits to the outside.

Hereinafter, the configuration and operation of the intelligent electronic device of the present invention configured as described above will be described in more detail.

First, in the analog interface 10, a current detected by a current sensor detecting a secondary side current of a circuit breaker in a power device may be input, and a voltage detected by a voltage sensor detecting a voltage of a transmission line may be input. there is. The analog interface 10 includes an analog-to-digital converter to convert the detected current and voltage values into digital signals so that the controller 40 can check them.

The digital input/output unit 20 may detect state information of the circuit breaker and output a trip signal for controlling opening and closing of the circuit breaker to the circuit breaker.

The configuration and operation of the analog interface 10 and the digital input/output unit 20 above may be the same as those of a general intelligent electronic device (IED).

However, conventional analog interfaces are limited to receiving analog values of current or voltage and converting them into digital signals.

It should be understood that the present invention is intended to further expand diagnostic and monitoring functions to conventional intelligent electronic devices, and thus, the analog interface 10 and the digital input/output unit 20 enable input and control of more diverse signals.

2 is a detailed block configuration diagram of the environmental sensor 30.

Referring to FIG. 2, the environmental sensor 30 includes a plurality of internal temperature sensors 31, external temperature sensors 32, vacuum sensors 33, humidity sensors 34, vibration sensors 35, and partial discharge sensors 36. ) may be included.

The environmental sensor 30 is an aggregate of a plurality of sensors, and the information detected by the environmental sensor 30 is converted into a signal recognizable by the control unit 40 through the analog interface 10 or the digital input/output unit 20. .

That is, if the individual sensors constituting the environment sensor 30, such as the internal temperature sensor 31 and the external temperature sensor 32, are analog sensors, they are connected to the analog interface 10, and if the individual sensors are digital sensors, they are connected to the digital input/output unit. (20) can be connected.

The operation of the individual sensors constituting the environment sensor 30 will be described in more detail as follows.

The internal temperature sensor 31 may detect the temperature of components of a power device, such as a switchboard, for example. By detecting the temperature of the component through the internal temperature sensors 31, abnormal overheating can be detected and the risk of fire occurrence can be monitored.

The external temperature sensor 32 detects the external temperature of the power device.

The reason and operation of detecting the external air temperature of the power device using the external temperature sensor 32 will be described later in more detail.

The vacuum sensor 33 detects the degree of vacuum of the vacuum circuit breaker. The degree of vacuum of the vacuum circuit breaker detected by the vacuum sensor 33 is provided to the control unit 40 through the analog interface 10 or the digital input/output unit 20 according to the method of the vacuum sensor 33, and the control unit 40 detects The state of the vacuum circuit breaker can be monitored using the vacuum level obtained.

In addition, the humidity sensor 34 of the environment sensor 30 may be provided in plural, and the humidity of the inside and outside of the power device may be detected and provided to the control unit 40 . The humidity sensor 34 can check whether the humidity difference between the inside and outside of the power device is normal. The control unit 40 determines that the power device is flooded or leaked when the difference in humidity between the inside and outside is less than the reference value, displays a flood check on the display unit 50, and transmits it to the outside through the communication unit 60.

The communication unit 60 may use serial communication or Ethernet communication, or both serial communication and Ethernet communication, and may use wireless Ethernet communication as needed.

The vibration sensor 35 of the environmental sensor 30 detects the vibration of the power device. The detection of the vibration may be performed by detecting the direction and magnitude of the vibration.

Electric power devices generally generate constant vibration and noise during operation. The control unit 40 checks whether the vibration detected by the vibration sensor 35 is normal, and if the vibration is abnormal, determines that an abnormality has occurred, displays it on the display unit 50, and transmits the abnormal state through the communication unit 60. .

In the present invention, various data is transmitted. That is, it is necessary to transmit protection relay related data and environment data, and at this time, the communication unit 60 may use a virtual port to transmit various data through a single port. The control unit 40 can simultaneously operate a sequence for transmitting protection relay-related data and a sequence for transmitting environmental data by using a single port in time division.

The partial discharge sensor 36 of the environment sensor 30 detects discharge generated in the power device. Partial discharge may be caused by mechanical stress or aging of insulation, and the partial discharge sensor 36 may be installed in the main insulation part of the power device to detect partial discharge and check whether insulation characteristics are deteriorated.

As such, the present invention can check various states of power devices by adding the environmental sensor 30 to an intelligent electronic device.

The intelligent electronic device of the present invention can detect the temperature and external temperature of the components to check aging of the components and predict the remaining lifespan. The prediction of the remaining life will be described in more detail.

3 is a flowchart of a monitoring judgment example of the control unit 40 .

Referring to FIG. 3 , the control unit 40 detects the temperature of the components constituting the power device through a plurality of internal temperature sensors 31 (S10), and the outside air outside the power device through the external temperature sensor 32 Temperature detection step (S20), temperature pattern calculation step (S30) of patterning by using the temperature of the components and the outside temperature in the controller 40, and time-sequentially arranging the temperature patterns for each component Checking the temperature pattern change by period (S40), monitoring the possibility of fire by checking the temporal change trend of the temperature pattern (S50), and the type and function information of each component stored in the memory 41 and the pattern It is configured to include a step (S60) of estimating the degree of aging deterioration using the temperature pattern of each component.

Hereinafter, a monitoring example of the present invention configured as described above will be described in more detail.

First, in the present invention, the internal temperature and the external temperature of the power device are detected together, the difference between the internal temperature and the external temperature of the power device is obtained, and temperature monitoring and aging estimation are performed using this.

For this purpose, the internal temperature sensor 31 and the external temperature sensor 32 of the environment sensor 30 are used.

At this time, as described above, the internal temperature sensors 31 detect the temperature of each of the components requiring temperature detection, and the number of internal temperature sensors 31 is the same as the number of components requiring temperature detection.

The internal temperature sensor 31 can be applied regardless of its type.

When installed, the internal temperature sensor 31 checks the type of each detected component, performs 1:1 matching between the internal temperature sensor 31 and the type of component, and stores matching information in the memory 41.

In addition, the external temperature sensor 32 detects the external temperature of the power device. At this time, the external temperature refers to the outside of the power device, and does not necessarily mean the outdoor temperature. That is, when the power device is disposed indoors, it may be the indoor temperature.

The external temperature sensor 32 can also be applied to the implementation of the present invention regardless of its type.

In step S10, the temperature of internal components of the power device is detected, and in step S20, the external temperature of the power device is detected.

The temperature detection result of each step S10 and S20 is input to the controller 40 through the analog interface 10 or the digital input/output unit 20.

The control unit 40 may use a conventional processor or a computing device including the processor.

The control unit 40 obtains a temperature pattern by using the difference between the temperature detection result of each component in step S10 and the outdoor temperature detection result in step S20, which are detected at the same time as in step S30.

Here, the temperature detection result of each component may be different, and since the outdoor temperature is measured as one value at the same time point, the temperature characteristics of each component with respect to the outdoor temperature can be obtained.

The temperature patterning used in the present invention can be achieved by subtracting the outdoor temperature from the temperature detection result of the component, and as another example, a relative ratio can be detected by dividing the temperature detection result of the component by the outdoor temperature.

As such, the temperature pattern is to form a value excluding the influence of the outside air temperature during processing using temperature, and it is possible to check the temperature change of each component that occurs during the actual operation of the power device excluding the influence of the outside air.

In particular, the temperature pattern may be periodically collected. The collection period of the temperature pattern may be arbitrarily set.

The temperature patterns obtained in this way are arranged time-sequentially in step S40 in the control unit 40, and a change in temperature patterns for each component can be detected.

Next, in step S50, the change trend of the temperature pattern is detected, and the possibility of fire occurrence is predicted.

More specifically, FIG. 4 is a detailed flowchart of step S50.

Referring to FIG. 4, it is determined whether a section in which the trend of change in the temperature pattern is changed to more than a set slope has occurred (S51), and if there is a section where the change in the slope is more than the set slope, it is checked whether the value of the current temperature pattern is equal to or greater than the set fire risk temperature (S52). ).

As a result of the check in the step S52, if the fire risk set temperature is higher, a fire risk alarm is issued (S54). The fire risk alert at this time is displayed on the display unit 50 and transmitted to the outside through the communication unit 60.

If it is less than the fire risk set temperature, it is checked whether the change section of the current set slope or more has occurred more than the set number of times (S53).

If it does not occur more than the set number of times, step S51 is performed again, and if it occurs more than the set number of times, aging deterioration estimation is performed (S60).

Through this process, the temperature of the component excluding the influence of the outside temperature and the temperature change trend can be checked, and the temperature of the component can be more accurately detected and the risk of fire can be monitored accordingly.

5 is a detailed flowchart of the aging deterioration estimation step.

Referring to FIG. 5, the aging deterioration estimation step (S60) includes a step of checking the material properties of the corresponding component stored in the memory 41 (S61), and a step of checking the component type to determine whether the corresponding component is a movable part or a fixed part ( S62) and estimating the degree of deterioration of the corresponding component using the size and change trend of the temperature pattern according to the confirmed material characteristics and the type characteristics of the component (S63).

Components of a power device operate at high temperatures for a long time, and when exposed to high temperatures for a long time, a layer deficient in a specific element may be formed depending on the material, or there may be a difference in the degree of precipitation of impurities into grain boundaries.

In the memory 41, the degree of formation of the deficient layer of the specific element according to the material and the value of the precipitation degree of the impurities are stored, and in step S61, the state due to the change in the internal structure can be confirmed by checking the material characteristics.

In addition, in step S62, the type of component is confirmed. At this time, the type of component is to check the mechanical properties of the component. When a component is mechanically operated, stress due to mechanical operation repeatedly occurs, so the expected life due to aging deterioration is shorter than that of a component that is not operated and is fixedly installed. It has a characteristic.

In this way, it is possible to perform more accurate aging deterioration estimation by estimating aging deterioration by checking whether or not the components are mechanically operated.

Next, the control unit 40 estimates aging deterioration of the corresponding component by using the size of the temperature pattern obtained in advance and the increasing trend of the temperature pattern. In other words, it is possible to predict the life of components and estimate the replacement time.

Detailed aging deterioration estimation can be made sequentially.

First, the size of the temperature pattern is checked to predict the lifespan according to the material of the component (first estimated value).

Then, a second estimate value is obtained by correcting the obtained first estimate value according to the type of component.

At this time, the correction value for correcting the second estimated value can be given a value of 0 for a fixed component without moving, and a value of -N for a component that is an auxiliary movable component. Here, N is an arbitrary number, and the second estimation value is obtained by performing correction to further reduce the remaining life indicated by the first estimation value in the case of a movable product.

Then, a third estimate value, which is a final life prediction result, is estimated by correcting the second estimate value by using the trend of increase in the temperature pattern.

At this time, a correction value for estimating the third estimation value can be obtained by an equation of -X/n.

X is the slope of the temperature pattern transition of the component, and n is assumed to be a constant.

That is, the larger the slope, the larger the absolute value of the correction value, and the more rapid the change trend of the temperature pattern is, the shorter the estimated remaining lifespan is corrected.

The estimated degree of aging deterioration may be displayed on a display unit (not shown) or the like, or may be processed to be recognized by a manager through a communication unit (not shown).

In this way, the present invention can monitor the fire risk using the temperature of the internal components of the power device excluding the outside temperature, and can estimate the remaining life of each component using the component temperature and the temperature change trend of the components.

Information on the remaining service life of components may be displayed on the display unit 50 and transmitted to the outside through the communication unit 60 .

As such, the present invention can check various states of power devices by extending the function of an intelligent electronic device (IED) that performs circuit breaker status inspection and control, and can predict aging by checking aging of individual components.

Embodiments according to the present invention have been described above, but these are only examples, and those skilled in the art will understand that various modifications and embodiments of equivalent range are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

10: analog interface 20: digital input/output unit
30: environmental sensor 40: control unit
50: display unit 60: communication unit

Claims (5)

Environmental sensors for detecting various environmental information of the components of the power device;
an analog interface for converting current and voltage detected as analog signals into digital signals and converting analog signals among information detected by the environment sensor into digital signals;
A digital input/output unit for receiving state information of the circuit breaker and receiving a digital signal among information detected by the environment sensor;
A control unit controlling a circuit breaker according to digital signals input through the analog interface and the digital input/output unit and checking the state of components constituting the power device; and
Including a display unit for displaying the status of the circuit breaker and inspection results of components,
The environmental sensor,
Internal temperature sensors for detecting the temperature of each component inside the power device; and
Including an external temperature sensor for detecting the external temperature of the power device,
The control unit monitors the possibility of a fire using the temperature of each component and the outside temperature and estimates the remaining life of the component,
The control unit detects changes in the internal structure using the material characteristics of the component and the degree of formation of the deficient layer of the unique element according to the material stored in the memory and the precipitation degree of impurities, and estimates the degree of deterioration according to the mechanical properties of the component,
The difference between the internal temperature detected by the internal temperature sensor and the external temperature detected by the external temperature sensor is obtained to predict a first estimated value, which is a lifespan according to the size of the temperature pattern and the material of the component,
After correcting the first estimated value according to the mechanical properties of the component to obtain the second estimated value,
An intelligent electronic device characterized in that a third estimate value, which is a final life prediction result, is obtained by correcting the second estimate value using the increase trend of the temperature pattern. According to claim 1,
The intelligent electronic device further comprising a communication unit for transmitting the state of the circuit breaker and the inspection result of the components to the outside. According to claim 1,
The environmental sensor,
An intelligent electronic device including a vacuum sensor for detecting the vacuum level of a vacuum circuit breaker of a power device. delete According to claim 1,
The environmental sensor,
Including partial discharge sensors,
An intelligent electronic device, characterized in that the control unit monitors the deterioration of the insulation of the power device.

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