KR102684955B1 - Switchgear (High-voltage panel, Low-voltage panel, Motor control panel, Distribution board) Capable of Predicting Fire Explosion Signs and Detecting Partial Discharge Signals using Dual-type Sensors and HFCT Sensors - Google Patents

Abstract

The present invention detects the temperature inside the enclosure, appropriately adjusts the supply and discharge direction of external air according to the temperature distribution, and detects partial discharge signals to prevent fire and explosion due to insulation deterioration of power equipment. This relates to a switchboard (high-voltage panel, low-voltage panel, motor control panel, distribution panel) that can predict signs of fire and explosion and detect partial discharge signals using type sensors and HFCT sensors.
In order to solve the above problems, a switchgear capable of predicting fire explosion signs and detecting partial discharge signals using a dual-type sensor and an HFCT sensor according to the present invention includes an enclosure; A plurality of dual type sensors; A plurality of HFCT sensors; hybrid antenna; monitoring device; and a cooling device.

Description

Switchgear (High-voltage panel, Low-voltage panel, Motor control panel, Distribution board) Capable of Predicting Fire Explosion Signs and Detecting Partial Discharge Signals using Dual-type Sensors and HFCT Sensors}

The present invention relates to a switchgear (high-voltage panel, low-voltage panel, motor control panel, distribution board) capable of predicting signs of fire and explosion and detecting partial discharge signals using a dual-type sensor and an HFCT sensor. More specifically, it relates to a switchboard (high-voltage panel, low-voltage panel, motor control panel, distribution panel) that can predict signs of fire and explosion and detect partial discharge signals using a dual-type sensor and an HFCT sensor. A dual-type sensor and HFCT prevent fires and explosions by detecting temperature signals and partial discharge signals and detecting partial discharge signals occurring in the ground wire through the HFCT sensor to monitor overheating and insulation deterioration of power equipment installed inside the switchgear. This relates to a switchboard (high-voltage panel, low-voltage panel, motor control panel, distribution board) that can predict fire explosion signs and detect partial discharge signals using sensors.

In general, most power accidents in power facilities that make up the switchboard, including the high-voltage panel, low-voltage panel, motor control panel, and distribution board, are caused by explosion of the equipment due to overheating and fire due to insulation deterioration. Therefore, in recent years, the temperature inside the switchboard has increased. Various technologies are being developed to prevent power accidents by monitoring overheating or insulation deterioration due to temperature changes.

As a prior art for the above purpose, Patent Registration No. 1033096 discloses a safety device, an angle-adjustable ventilator, and a cooling efficiency improvement switchboard including the same (hereinafter referred to as 'patent document').

The patent document includes a cover unit that is provided on the outside of a switchboard to protect a blade, and is provided with a plurality of covers having a plurality of dense vents, the cover portion being installed so that the vents of the plurality of covers are arranged alternately; An angle adjustment bracket installed on the switchboard door and provided between the blade and the cover part, the intake is tilted toward the bottom and the exhaust is tilted at a specific angle toward the top, so as to tilt the blade at a certain angle; and a safety circuit connected to the switchboard and the blades and including a limit switch that blocks power for rotation of the blade when at least one switchboard door is opened, wherein the ventilator is composed of a first and a second ventilator, The first ventilator is installed at a lower part of one side of the switchboard, has a first blade facing downward, and is installed so that the first blade rotates toward the inside of the switchboard to perform an intake function, and the second ventilator is installed at the bottom of the switchboard. On the other side, the second blade is installed upside down so that it is provided inside the switchboard, the second blade faces downward, and the second blade is installed to rotate toward the outside of the switchboard to perform an exhaust function.

However, since the above patent document operates with the intake and exhaust directions fixed while the angle of the blade is adjusted, there is a problem in that effective cooling of power equipment that has overheated inside the switchgear is not achieved.

Therefore, the structure has been improved to detect the temperature inside the enclosure to appropriately adjust the supply and discharge direction of external air according to the temperature distribution, and to detect partial discharge signals to prevent fires and explosions due to insulation deterioration of power equipment. The development of a well-equipped switchgear is required.

KR 10-1033096 B1 (2011. 04. 27.) KR 10-2022-0145065 A (2022. 10. 28.) KR 10-2022-0137440 A (2022. 10. 12.) KR 10-2020-0013408 A (2020. 02. 07.)

The present invention was developed to solve the problems of the conventional switchgear capable of detecting overheating and insulation deterioration as described above. The problem to be solved by the present invention is to detect the temperature inside the enclosure and supply external air according to the temperature distribution. Predict signs of fire and explosion and detect partial discharge signals using a dual-type sensor and HFCT sensor that can prevent fires and explosions due to insulation deterioration of power equipment by appropriately adjusting the discharge direction and detecting partial discharge signals. The goal is to provide as many switchboards (high-voltage panel, low-voltage panel, motor control panel, distribution board) as possible.

The switchgear capable of predicting fire explosion signs and detecting partial discharge signals using a dual-type sensor and an HFCT sensor according to the present invention to solve the above problems includes a rectangular box-shaped enclosure having a predetermined size; A plurality of dual-type sensors installed inside the enclosure to detect temperature and partial discharge signals and transmit the detected signals wirelessly; A plurality of HFCT sensors installed on a ground wire installed inside the enclosure to detect a partial discharge signal; A hybrid antenna installed on one side of the enclosure and wirelessly receiving signals transmitted from the dual-type sensor; a monitoring device that receives a temperature signal and a partial discharge signal received from the hybrid antenna and determines whether overheating or insulation is abnormal by receiving the partial discharge signal through the plurality of HFCT sensors; And a cooling device for cooling by controlling the direction of air supplied and discharged into the interior of the enclosure through a plurality of air supply units installed at predetermined intervals on the side of the enclosure, wherein the plurality of dual-type sensors include the It is configured to simultaneously detect a temperature signal for detecting the temperature inside the enclosure and a partial discharge signal radiated into the air, and the monitoring device monitors the temperature inside the enclosure based on temperature information detected through the plurality of dual-type sensors. A matrix is created, and based on the generated temperature matrix, outside air is controlled to flow in through the air supply unit located close to a relatively high temperature area, and the air inside the enclosure is supplied to the outside through another unselected air supply unit. is controlled to be discharged, and estimates whether and where partial discharge occurs by comparing partial discharge signals detected through the plurality of dual-type sensors and the plurality of HFCT sensors, and installs inside the enclosure based on the estimated position. It is characterized by specifying the target of the power equipment and guiding the inspection target.

In the present invention, the air supply units are installed opposite to each other on the front and rear or left and right sides of the enclosure, and the temperature matrix is such that, based on the air supply unit, the internal space of the enclosure is 8 in the front-back, up-down, and left-right directions. Another feature is that it is divided into three zones.

In addition, in the present invention, the hybrid antenna is configured to receive a frequency band in the range of 800 MHz to 1.1 GHz, and the monitoring device switches the frequency band received from the hybrid antenna at a predetermined time period so that the temperature signal and the partial discharge signal alternate. Another feature is that it is controlled to be received.

In addition, the present invention includes a temperature measuring unit where the dual type sensor measures the temperature inside the enclosure; And another feature includes a partial discharge signal detection unit that detects a partial discharge electromagnetic wave signal inside the enclosure.

Another feature of the present invention is that the plurality of HFCT sensors are configured to have a frequency bandwidth of 100 kHz to 20 MHz.

In addition, the present invention includes an upper case where the plurality of HFCT sensors have a predetermined size with an open bottom; a lower case of a predetermined size that selectively covers the bottom of the upper case; And another feature includes a sensor module that is accommodated inside the upper and lower cases and detects a partial discharge signal through a ground line.

In addition, another feature of the present invention is that the plurality of HFCT sensors are further equipped with an ozone detection sensor that detects ozone generated inside the enclosure.

Another feature of the present invention is that the plurality of HFCT sensors are further equipped with a nitrogen monoxide detection sensor that detects nitrogen monoxide generated inside the enclosure.

According to the present invention, an air supply unit is installed at the front and rear or at the top and bottom of the left and right sides of the switchboard, and the internal space of the switchboard is divided into eight areas in the front and rear, top and bottom, and left and right directions to form a temperature matrix, so that the area where overheating occurs. It has the advantage of being able to cool quickly and effectively by supplying outside air to the side.

In addition, temperature signals and partial discharge signals are detected through a dual-type sensor and a hybrid antenna, and partial discharge signals, ozone concentration, and nitrogen monoxide concentration are detected through the HFCT sensor, and the monitoring device determines whether partial discharge has occurred and the location of partial discharge. Since signs of fire and explosion are predicted, there is an advantage in preventing fire and explosion caused by partial discharge.

Figure 1 is a configuration diagram showing an example of a switchgear (high-voltage panel, low-voltage panel, motor control panel, distribution panel) capable of predicting fire explosion signs and detecting partial discharge signals using a dual-type sensor and an HFCT sensor according to the present invention.
Figure 2 is a diagram showing a dual-type sensor according to the present invention.
Figure 3 is a diagram showing an example of a HFCT sensor according to the present invention.
4 and 5 are diagrams showing examples of hybrid antennas according to the present invention.
Figure 6 is a configuration diagram showing an example of a monitoring device according to the present invention
Figure 7 is a diagram showing an example in which the internal temperature matrix of the enclosure according to the present invention is divided.
Figure 8 is a configuration diagram showing an example of a cooling device according to the present invention.
Figure 9 is a diagram showing an example of operation of the cooling device according to the present invention.
Figure 10 (a, b, c, d, e) is a diagram showing an example of an antenna designed to select the structure of a hybrid antenna according to the present invention.
Figures 11 to 15 are graphs showing return loss characteristics for each antenna according to Figure 10.

Hereinafter, the present invention will be described in detail according to the accompanying drawings showing preferred embodiments.

The present invention detects the temperature inside the enclosure, appropriately adjusts the supply and discharge direction of external air according to the temperature distribution, and detects partial discharge signals to prevent fire and explosion due to insulation deterioration of power equipment. The purpose of the present invention is to provide a switchboard (high-voltage panel, low-pressure panel, motor control panel, distribution board) capable of predicting signs of fire and explosion and detecting partial discharge signals using a type sensor and an HFCT sensor. This invention is an enclosure as shown in FIG. (10), includes a dual type sensor 20, HFCT sensor 30, hybrid antenna 40, monitoring device 50, and cooling device 60.

The enclosure 10 is formed in a square box shape to protect various devices for the switchboard inside from external forces.

As shown in FIG. 1, this enclosure 10 has an openable door (no reference numeral) installed on one side, and one or more dual-type sensors 20, which will be described later, are installed inside the door, and on one side A hybrid antenna 40 and a monitoring device 50, which will be described later, are respectively installed.

The dual type sensor 20 is installed inside the enclosure 10 and detects the internal temperature and partial discharge signal of the enclosure 10 at the same time.

As shown in FIG. 2, this dual-type sensor 20 has a base portion 21 in the shape of a rectangular plate with a predetermined width and length, and is installed at one end of the base portion 21 to measure temperature. Part 22, a partial discharge signal detection part 23 installed at the other end of the base part 21 to detect a partial discharge electromagnetic wave signal, and a temperature signal measured while located on one side of the temperature measuring part 22. A first antenna unit 24 that transmits toward the hybrid antenna 40, and a second antenna unit positioned on one side of the partial discharge signal detection unit 23 and transmitting the detected partial discharge signal toward the hybrid antenna 40 ( 25) and a power supply unit 26 that applies power to the temperature measurement unit 22 and the partial discharge signal detection unit 23.

At this time, the dual type sensor 20 may be made of a thin flexible sheet structure with a thickness of 2 to 5 mm and then attached to the inside of the enclosure 10 through adhesive or double-sided tape, or alternatively, the base portion 21 ) may be configured to be installed on one side of the permanent magnet (not shown) and then attached to the enclosure 10 by magnetic force.

In addition, the first antenna unit 24 is configured to transmit the temperature signal measured by the temperature measurement unit 22 as a UHF (Ultra High Frequency) signal in the 800 ~ 950 MHz band, and the second antenna unit 25 is configured to transmit the temperature signal measured by the temperature measurement unit 22 as a UHF (Ultra High Frequency) signal in the 800 ~ 950 MHz band. It may be configured to transmit the partial discharge signal detected by the signal detection unit 23 as a UHF (Ultra High Frequency) signal in the 1 to 1.1 GHz band.

In addition, the power supply unit 26 may be configured as an energy harvesting type that generates electricity using any energy selected from heat, electromagnetic waves, and vibration. In this case, the power supply unit 26 has MUC ( Not shown), a capacitor (not shown), and a rectifier circuit (not shown) may be further included.

In addition, a plurality of dual-type sensors 20 according to the present invention may be installed for each inner area of the enclosure 10 in order to effectively control the direction of air flowing in and out through the cooling device 60, which will be described later. For example, As shown in Figure 9, a pair of dual type sensors (20A, 20B) can be installed on the inner upper part of the enclosure 10, and another pair of dual type sensors (20C, 20D) can be installed on the inner lower part. As described above, the temperature matrix inside the enclosure 10 is determined by the monitoring device 50, which will be described later, through the temperature information detected by the plurality of dual-type sensors 20 installed at the top and bottom of the enclosure 10, respectively. is created.

The HFCT sensor 30 is installed on the ground wire installed inside the enclosure 10 and detects a partial discharge signal.

As shown in FIG. 3, the HFCT sensor 30 includes an upper case 31 of a predetermined size with an open bottom, and a lower case 32 of a predetermined size that selectively covers the bottom of the upper case 31. and a sensor module 33 that is accommodated inside the upper and lower cases 31 and 32 and detects a partial discharge signal through a ground wire.

At this time, the sensor module 33 may be configured to form a ring shape by separately assembling two cores having a semicircular shape so that a ground wire passes through them.

And inside the upper case 31, a PCB 34 with a communication module 35 installed can be installed to transmit the information collected by the sensor module 33 to the monitoring device 50, which will be described later, through a wire.

In addition, an ozone detection sensor 36 and a nitrogen monoxide detection sensor 37 may be further installed on one side of the PCB 34 to detect ozone and nitrogen monoxide generated inside the enclosure 10, respectively, and these ozone detection sensors The information detected by the nitrogen monoxide detection sensor (36) and the nitrogen monoxide detection sensor (37) is transmitted to the monitoring device (50) through the communication module (35).

In addition, the upper case 31 and the lower case 32 may be configured so that one end is coupled with a hinge and the other end can be opened and closed through a locking device such as a clip, and through this, the inside of the upper and lower cases 31 and 32 A ground wire (no reference numeral) is installed to penetrate the sensor module 33 accommodated in and then the lock is locked to prevent the ground wire from being arbitrarily separated from the sensor module 33.

In addition, the ozone detection sensor 36 and the nitrogen monoxide detection sensor 37 are installed to be exposed to one side of the upper case 31, or an opening (no reference numeral) of a predetermined size is formed to allow air to enter the upper case 31. It can be configured to flow freely into the interior, and through this, the concentration of ozone and nitrogen monoxide contained in the air inside the enclosure 10 is detected.

In addition, the sensor module 33 can reliably detect partial discharge signals occurring in the ground wire and adjusts the number of turns of the induction coil wound around the core to remove signals in unnecessary bands to have a frequency bandwidth of 100 kHz to 20 MHz. It can be configured.

In general, a partial discharge signal shows a wide frequency spectrum where the current pulse (hereinafter referred to as 'partial discharge signal') occurring at the origin (PD) is from hundreds of MHz to hundreds of GHz, and has a rise time of a few nanoseconds or less. , When detected through the sensor module 33, most of the frequencies in the high frequency band are removed, and as a result, frequency components of less than 10 MHz are detected depending on the distance from the origin of the partial discharge.

In addition, by installing a plurality of HFCT sensors 30 at equal intervals, it is possible to check the HFCT sensor 30 located close to the origin of the partial discharge through the time difference of the partial discharge signal detected by each HFCT sensor 30. It is possible, and it is possible to estimate the device in which partial discharge occurred based on the location of the HFCT sensor 30 confirmed in this way.

To this end, the time of each sensor module 20 of the plurality of HFCT sensors 30 is synchronized based on the universal time adjusted from the pulse per second signal (PPS) of GPS.

In addition, changes in the concentration of ozone and nitrogen monoxide detected by the ozone and nitrogen monoxide detection sensors 36 and 37 of the HFCT sensor 30, which detect the same partial discharge signal, are detected, and through this, the monitoring device 50 detects partial discharge. As a result, it is possible to more accurately predict whether arcs will occur and signs of fire or explosion.

The hybrid antenna 40 is installed on one side of the enclosure 10 to receive temperature signals and partial discharge signals measured or detected by the dual type sensor 20 and transmit them to the monitoring device 50, which will be described later.

This hybrid antenna 40 includes an antenna housing 41 having a predetermined size, as shown in FIG. 4, and an antenna block 42 of a predetermined size installed inside the antenna housing 41.

At this time, the antenna block 42 can be configured in the 800 MHz to 1.1 GHz band range to simultaneously receive the temperature signal transmitted from the temperature measurement unit 22 and the partial discharge signal transmitted from the partial discharge signal detection unit 23. .

For this purpose, the antenna block 42 is formed to have a rectangular plate-shaped base plate 42A having a predetermined length as shown in FIG. 5, and a predetermined length along the length L of the base plate 42A. A protrusion 42B of a predetermined length formed through an incision (no reference numeral) at a predetermined interval G is located in the center of the base plate 42A and connects the protrusion 42B in the vertical direction. A space 42D of a predetermined size is formed so that the connection portion 42C of width W2 and the protrusions 42B formed in the vertical direction and located on the left and right with respect to the connection portion 42C are spaced apart from each other at a predetermined distance. Includes.

And one end of the cut portion is formed to contact two vertically symmetrical diagonals that pass through the virtual center point (CP) of the base plate (42A), and one end of the protrusion (42B) is formed to contact the left and right sides that pass through the virtual center point (CP). It is formed to contact two symmetrical diagonals, and through this, the space 42D is naturally formed in the range of the second angle A2 between the protrusions 42B.

At this time, the first angle A1 between the two diagonals forming vertical symmetry can be 40 to 45°, and the second angle A2 between the two diagonals forming left and right symmetry can be formed at 55 to 60°. The protrusions 42B and the cutouts located in each direction are formed to cross each other, and the protrusions 42B and the cutouts on the left and right are formed in a shape rotated by 180° based on the virtual center point CP.

Additionally, the connection portion 42C may be formed to have a width of 1 to 3 mm. This is to prevent delay loss of the signal received through each protrusion 42B while preventing the connection portion 42C from being easily short-circuited. .

A frequency signal in the 800 MHz to 1.1 GHz band is received through the hybrid antenna 40 configured as above and then transmitted to the monitoring device 50, which will be described later.

The monitoring device 50 uses the temperature signal and partial discharge signal received through the hybrid antenna 40 to determine the internal state of the enclosure 10, that is, whether there is overheating or insulation abnormality, and takes appropriate action to the worker as necessary. It is a guiding structure.

As shown in FIG. 6, this monitoring device 50 is wired and connected to the hybrid antenna 40 through a cable to receive signals and perform signal switching to switch the frequency band of the received signal at predetermined time intervals. unit 51, a temperature signal processing unit 52 that removes noise from the temperature signal received in the 800 to 950 MHz band through the signal switching unit 51 and then amplifies it, and through the signal switching unit 51, 1 A partial discharge signal processor 53 that removes noise from the partial discharge signal received in the ~1.1 GHz band and then amplifies it, the temperature signal processor 52, and the temperature signal and partial discharge transmitted from the partial discharge signal processor 53. An A/D conversion unit 54 that converts a signal into a digital signal, a communication unit 55 that transmits the digital signal converted through the A/D conversion unit 54 to a cloud server or smart device through wired or wireless communication, and It includes a display unit 56 that outputs temperature and insulation abnormality status on the display based on the digital signal converted through the A/D conversion unit 54.

In addition, the monitoring device 50 is configured to set the switching period (interval) of the signal switching unit 51, and when a temperature or partial discharge signal exceeding the set value is received, the switching of the signal is stopped for a set time. , it can be controlled to determine whether there is an insulation condition abnormality such as overheating or partial discharge by continuously receiving a signal in which an abnormality is detected for a set period of time.

At this time, if the signal for which an abnormality is detected is continuously received as a signal exceeding the set value, the occurrence of overheating or partial discharge according to the signal is simultaneously announced through the communication unit 55 and the display unit 56, and the corresponding monitoring device 50 It can be controlled to generate a warning light or alarm.

In addition, if the signal for which an abnormality is detected is not continuously received as a signal above the set value, but is received as a signal below the set value, it is judged to be a misdetection of the temperature or partial discharge signal, etc., and then the signal switching unit 51 The signal is switched again and controlled to be received.

Here, the signal switching unit 51 can be set to switch signals at intervals of 1 to 2 seconds, which means that even if a time difference of 1 to 2 seconds occurs through the signal switching unit 51, the temperature and whether partial discharge occurs are monitored in real time. This is because there is no time difference that the user can feel during monitoring, and therefore, it is possible to provide monitoring information at the same level as substantially continuous real-time monitoring.

In addition, the time for continuously detecting abnormal signals can be set to 5 to 10 seconds, and in addition, even if the abnormal signals are not continuous while continuously detecting abnormal signals, if 2 to 5 abnormal signals are received, the corresponding signal It may be configured to guide the user by determining that overheating or an insulation condition has occurred, which means that if overheating or fire occurs inside the enclosure (10), an overheating signal is generated due to the distance between the dual type sensor (20) and the heat source and the movement of heat. This is because the signal may not be received continuously, and partial discharge signals may occur irregularly.

In addition, the monitoring device 50 transmits signals by wire through a plurality of HFCT sensors 30, and the signals transmitted in this way are converted into digital signals through the partial discharge signal processing unit 43 and the A/D conversion unit 54. After conversion, it is output through the display unit 56.

In addition, since it is determined whether a partial discharge has occurred by comparing the temperature signal and the partial discharge signal detected through the plurality of dual type sensors 20 and the HFCT sensor 30, respectively, it is relatively inexpensive compared to determining whether a partial discharge has occurred using a single sensor. It can be accurately detected, and at the same time, it is possible to detect changes in ozone and nitrogen monoxide concentration to determine whether partial discharge has occurred, the location of partial discharge, signs of fire and explosion, etc., and provide guidance.

The cooling device 60 supplies external air to the inside of the enclosure 10 and discharges the internal air to the outside to cool the power equipment installed inside the enclosure 10, thereby preventing overheating of the power equipment.

As shown in FIG. 7, this cooling device 60 is equipped with a total of eight air supply units 61, 62, 63, and 64, one pair each at the top and bottom in the front-back direction or the left and right sides, and these air supply units 61 , 62, 63, 64) are installed to face each other in the front-back direction or the left and right sides and are arranged to supply external air to the inside.

The air supply units (61, 62, 63, 64) configured as above supply external air to the inside of the enclosure (10) when power is selectively applied through the monitoring device (50), and in a state where power is not supplied. is used as a passage through which the air inside the enclosure 10 is discharged to the outside.

Above, when power is applied to the air supply units (61, 62, 63, 64), external air is supplied to the inside of the enclosure (10), and when the power is cut off, external air is supplied into the enclosure (10) through another air supply unit ( Although it is shown and explained that the air) is configured to cool the power equipment and then be naturally exhausted to the outside, more preferably, the air supply units (61, 62, 63, 64) have two units to allow air to be blown in both directions. It may be composed of a blowing fan, and through this, one blowing fan selected from among the two blowing fans is operated to supply outside air to the inside of the enclosure 10 or to discharge the air inside the enclosure 10 to the outside. It becomes possible.

Accordingly, by controlling the monitoring device 50, the direction in which external air is supplied into the interior of the enclosure 10 and the direction in which air is discharged from the interior of the enclosure 10 to the outside are selected to control the air supply units 61, 62, 63, and 64. By controlling the operation of , it becomes possible to change the direction of the air flow inside the enclosure 10.

In addition, the monitoring device 50 divides the internal space of the enclosure 10 into a total of eight divided areas by dividing it in the front-back, up-down, and left-right directions based on the positions of the air supply units 61, 62, 63, and 64. A temperature matrix is configured to be created, and dual-type sensors 20 are installed in each of the eight zones thus divided. Through this, the temperature matrix is generated in real time through temperature signals detected by each dual-type sensor 20. It is reflected and monitored.

Meanwhile, the cooling device 60 includes, in addition to the air supply units 61, 62, 63, and 64, upper and lower auxiliary fans 65, 66 for cooling the busbar, which is a component that mainly emits heat inside the enclosure 10. Additional upper and lower auxiliary fans 65 and 66 may be installed at predetermined intervals above and below the busbar 1, as shown in FIG. 8, and are installed below the busbar 1. It is arranged so that air flows upward.

And between the upper and lower auxiliary fans (65, 66), a pair of air guides (67, 68) are installed at a predetermined distance on both sides of the busbar (1) and have a predetermined length up and down, and these upper and lower The internal air of the enclosure (10) flows into the busbar (1) through the auxiliary fans (65, 66) and the air guides (67, 68) to cool the surface of the busbar (1), and then the monitoring device (50) It is discharged to the outside through the air supply units (61, 62, 63, 64) selected by .

At this time, the air guides (67, 68) naturally allow the surrounding air to flow vertically from the bottom to the top via the busbar (1) due to the operation of the upper and lower auxiliary fans (65, 66). It may have a structure in which a plurality of guide plates (no reference numerals) are disposed upwardly toward the busbar 1 and have a predetermined length in the horizontal direction so that the guide plate flows into the rectangular frame-shaped frame in the vertical direction.

Through the configuration of the upper and lower auxiliary fans (65, 66) and air guides (67, 68) as described above, outside air flows into the interior through the air supply units (63, 64) installed at the bottom of the enclosure (10), and the upper In a state where the air inside the enclosure (10) is set to be discharged to the outside through another air supply unit (61, 62) installed in, if the temperature of the busbar (1) is detected to have risen above the set temperature, the temperature in Figure 9 As shown, the upper and lower auxiliary fans (65, 66) are further operated to control the outdoor air flowing in through the lower air supply units (63, 64) to flow toward the upper side via the busbar (1). As a result, the busbar 1 is quickly cooled below the set temperature by air introduced from the outside.

Meanwhile, the present applicant selected a structure of the hybrid antenna 40 that can simultaneously receive signals in two different frequency bands measured and transmitted through the dual type sensor 20, that is, temperature signals and partial discharge signals. As shown in Figure 10, dipole (a), fat-dipole (b), log-periodic (c), spiral (d) and log-spiral (Log- Each spiral and e) antenna was designed, and the frequency characteristics (return loss) of each designed antenna were tested.

As a result, as shown in Figure 11, the dipole type (a) had the highest reception sensitivity of over -20dB in the 2.7GHz band, and the effective reception range was approximately 2.6 to 2.8GHz.

And, as shown in Figure 12, the fat-dipole type (b) has the highest reception sensitivity of over -2.5dB in the 1.7GHz band, and the effective reception range is approximately 1.6~1.7GHz.

In addition, as shown in Figure 13, the log-periodic type (c) was found to have a reception sensitivity of -9 db or more in the 800-900 MHz band and -11 db or more in the 2.4 GHz band, respectively. The effective reception range was found to be 800~1.4GHz and 2.2~2.3GHz.

In addition, as shown in Figure 14, the spiral (d) has a reception sensitivity of -13dB or more in the 1.1GHz band, -17dB or more in the 2.4GHz band, and -20dB in the 2.75GHz band. Each appeared, and the effective reception ranges were 1~1.1GHz, 2.3~2.4GHz, and 2.7~2.75GHz.

And, as shown in Figure 15, the log-spiral (e) was found to have a reception sensitivity of -1.5 dB or more in the 2 GHz band and -2.5 dB or more in the 2.5 GHz band, respectively, and the effective reception range was 2. It was found to be ~2.1GHz and 2.5~2.6GHz. Here, the reception sensitivity (return loss) means that the larger the value, the higher it is.

As a result of measuring the reception sensitivity of antennas designed in different shapes as above, the antenna types with high frequency sensitivity in a specific frequency band are the dipole type (Dipole, a) of -20 dB or more and the spiral type (Spiral, d) of -13 to -20 dB. ) was confirmed to be.

However, the hybrid antenna 40 of the present invention needs to receive temperature signals and partial discharge signals in frequency bands that do not interfere with each other through the dual type sensor 20, and the above dipole type (Dipole, a) Spiral (d) is not suitable because the effective reception range is narrow and frequency interference may occur.

Accordingly, it is necessary to select an antenna with high reception sensitivity and a wide effective reception range, and it was confirmed that the suitable antenna type is log-periodic (c) with a wide effective reception range of 800~1.4 GHz.

Accordingly, the hybrid antenna 40 of the present invention is designed in a log-periodic (c) type, and then the temperature signal is transmitted using a frequency in the 800-950 MHz band within a wide effective reception range of 800-1.4 GHz. The partial discharge signal is designed to be transmitted using a frequency in the 1 to 1.1 GHz band, making it possible to receive signals in two different frequency bands without mutual interference.

As described above, in the present invention, an air supply unit is installed at the front and back or at the top and bottom of the left and right sides of the switchboard, and the space inside the switchboard is divided into eight areas in the front-back, top-down, and left-right directions to form a temperature matrix, resulting in overheating. Outside air is supplied directly to the area where it is cooled, cooling it quickly and effectively.

In addition, temperature signals and partial discharge signals are detected through a dual-type sensor and a hybrid antenna, and partial discharge signals, ozone concentration, and nitrogen monoxide concentration are detected through the HFCT sensor, and the monitoring device determines whether partial discharge has occurred and the location of partial discharge. , signs of fire and explosion are predicted, so fire and explosion caused by partial discharge can be prevented.

Above, for convenience of explanation, reference numerals and names have been given to the drawings showing preferred embodiments and the configurations shown in the drawings. However, this is an embodiment according to the present invention, and the shapes shown in the drawings and the names given are The scope of the rights should not be construed as limited, and changes to various shapes that can be predicted from the description of the invention and simple substitution to a configuration that performs the same function are within the scope of changes that can be easily carried out by a person skilled in the art. You will see this as extremely self-evident.

10: Enclosure 20: Dual type sensor
21: base part 22: temperature measuring part
23: partial discharge signal detection unit 24: first antenna unit
25: second antenna unit 26: power supply unit
30: HFCT sensor 31: Upper case
32: lower case 33: sensor module
34: PCB 35: Communication module
36: Ozone detection sensor 37: Nitrogen monoxide detection sensor
40: Hybrid antenna 41: Antenna housing
42: Antenna block 42A: Base plate
42B: Protrusion 42C: Connection
42D: space 50: monitoring device
51: signal switching unit 52: temperature signal processing unit
53: Partial discharge signal processing unit 54: A/D conversion unit
55: communication unit 56: display unit
60: Cooling device 61, 62, 63, 64: Air supply unit
65: Upper auxiliary fan 66: Lower auxiliary fan
67, 68: Air guide A1: First included angle
A2: Second included angle CP: Virtual center point
G: Gap between incisions L: Length of base plate
W1: Width of base plate W2: Width of connection section

Claims (8)

A rectangular box-shaped enclosure (10) having a predetermined size;
A plurality of dual-type sensors 20 installed inside the enclosure 10 to detect temperature and partial discharge signals and transmit the detected signals wirelessly;
A plurality of HFCT sensors 30 installed on a ground line installed inside the enclosure 10 to detect a partial discharge signal;
A hybrid antenna 40 installed on one side of the enclosure 10 and wirelessly receiving a signal transmitted from the dual type sensor 20;
A monitoring device 50 that receives a temperature signal and a partial discharge signal received from the hybrid antenna 40 and determines whether overheating or insulation is abnormal by receiving the partial discharge signal through the plurality of HFCT sensors 30; and
A cooling device 60 that cools by controlling the direction of air supplied and discharged into the interior of the enclosure 10 through a plurality of air supply units installed at predetermined intervals on the side of the enclosure 10;
Including,
The plurality of dual type sensors 20,
It is configured to simultaneously detect a temperature signal for detecting the temperature inside the enclosure 10 and a partial discharge signal radiated into the air,
The monitoring device 50,
A temperature matrix inside the enclosure 10 is generated based on the temperature information sensed through the plurality of dual-type sensors 20, and the temperature matrix is generated at a location close to a relatively high temperature area based on the generated temperature matrix. Outside air is controlled to flow in through the air supply unit, and the air inside the enclosure (10) is controlled to be discharged to the outside through another unselected air supply unit,
By comparing the partial discharge signals detected through the plurality of dual-type sensors 20 and the plurality of HFCT sensors 30, it is estimated whether and where partial discharge occurs, and the enclosure 10 is based on the estimated position. It specifies the target of the power equipment installed inside and guides the inspection target.
The air supply unit is,
Installed opposite to each other on the front and rear or left and right sides of the enclosure 10,
The temperature matrix is,
Based on the air supply unit, the internal space of the enclosure 10 is divided into eight zones in the front-back, up-down, and left-right directions,
In the cooling device 60,
Upper and lower auxiliary fans 65 and 66 are installed to cool the busbar that emits heat inside the enclosure 10,
The upper and lower auxiliary fans (65, 66) are,
It is installed at predetermined intervals on the upper and lower sides with respect to the busbar (1) and is arranged so that air flows from below to the top of the busbar (1),
Between the upper and lower auxiliary fans 65 and 66,
Predict signs of fire and explosion using a dual-type sensor and an HFCT sensor, characterized in that a pair of air guides (67, 68) having a predetermined length up and down are installed on both sides of the busbar (1) at a predetermined distance and Switchboard capable of detecting partial discharge signals.
delete In claim 1,
The hybrid antenna 40,
It is configured to receive a frequency band ranging from 800 MHz to 1.1 GHz,
The monitoring device 50,
Prediction of signs of fire and explosion and partial discharge using a dual-type sensor and an HFCT sensor, characterized in that the frequency band received from the hybrid antenna 40 is controlled to receive alternately a temperature signal and a partial discharge signal by switching at a predetermined time period. A switchboard capable of detecting signals.
In claim 3,
The dual type sensor 20,
A temperature measuring unit 22 that measures the temperature inside the enclosure 10; and
a partial discharge signal detection unit 23 that detects a partial discharge electromagnetic wave signal inside the enclosure 10;
A switchgear capable of predicting signs of fire and explosion and detecting partial discharge signals using a dual-type sensor and an HFCT sensor, which includes a.
In claim 1,
The plurality of HFCT sensors 30,
A switchgear capable of predicting fire explosion signs and detecting partial discharge signals using a dual-type sensor and an HFCT sensor, which is configured to have a frequency bandwidth of 100 kHz to 20 MHz.
In claim 1 or claim 5,
The plurality of HFCT sensors 30,
an upper case (31) having a predetermined size and an open bottom;
a lower case 32 of a predetermined size that selectively covers the bottom of the upper case 31; and
a sensor module (33) accommodated inside the upper and lower cases (31, 32) and detecting a partial discharge signal through a ground wire;
A switchgear capable of predicting signs of fire and explosion and detecting partial discharge signals using a dual-type sensor and an HFCT sensor, which includes a.
In claim 6,
The plurality of HFCT sensors 30,
A switchgear capable of predicting signs of fire and explosion and detecting partial discharge signals using a dual-type sensor and an HFCT sensor, characterized in that an ozone detection sensor 36 that detects ozone generated inside the enclosure 10 is further installed.
In claim 6,
The plurality of HFCT sensors 30,
A distribution board capable of predicting signs of fire and explosion and detecting partial discharge signals using a dual-type sensor and an HFCT sensor, characterized in that a nitrogen monoxide detection sensor 37 that detects nitrogen monoxide generated inside the enclosure 10 is further installed. .

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