KR101232739B1 - A distributing board and motor control center, cabinet panel for sensing and arc or corona by detection of electromagnetic waves and uv - Google Patents

Abstract

PURPOSE: A switchgear, a motor control board, and a distribution panel board having an arc and corona discharge monitoring diagnostic function are provided to prevent malfunction by controlling an installation environment of an electromagnetic wave reception antenna according to variation of an internal installation environment. CONSTITUTION: An electromagnetic wave detection unit(111) measures the frequency of the electromagnetic wave signal radiated by discharge generated in the internal power equipment. An ultraviolet detection unit(112) measures the wavelength of the ultraviolet ray radiated by discharge generated in the internal power equipment. A reference electromagnetic wave generation unit(115) generates intermediate frequency measured by the electromagnetic wave detection unit and a reference signal with a preset intensity of electromagnetic wave in regard to an intermediate frequency. A collection unit(120) judges normality of the electromagnetic wave detection unit according to whether the reception intensity of the received reference signal is out of range by receiving the generated reference signal, collects frequency of the measured electromagnetic wave and collects the wavelength of the measured ultraviolet ray from the ultraviolet detection unit according to a judged result. A diagnostic unit(130) diagnoses a type of discharge by analyzing collected measured data from the collection unit. [Reference numerals] (120) Collection unit; (130) Diagnostic unit

Description

Distributing board and motor control panel and distribution panel with arc and corona discharge monitoring and diagnosis panel by electromagnetic wave and ultraviolet ray detection

The present invention installs an electromagnetic wave receiving antenna and an ultraviolet sensor in a switchgear, a motor control panel, and a distribution panel to diagnose the arc or corona caused by a poor connection or disconnection of the switchgear and a motor control panel, a distribution panel, and an arc and corona by ultraviolet detection. The present invention relates to a switchgear, a motor control panel and a distribution panel having a discharge monitoring diagnosis function.

Due to the advancement of the industry, electric power demand is continuously increasing, and accidents caused by electric power facilities in the switchboard are frequently occurring. These accidents can lead to technical losses as well as economic losses.

Typically, the arc insulation of internal lines due to vibrations and shocks generated during operation of transformers or contact points in switchboards oxidizes and thermally decomposes surrounding insulation to form a carbonized conductive path. As Joule heat is generated by the movement of electrons around the carbonization conductive path, insulation strength is lowered, and an accident such as an electric fire or an electric shock occurs. Accordingly, researches on various inspection techniques have been conducted to prevent accidents occurring in switchboards.

Conventionally, an electromagnetic wave detection method for measuring an electromagnetic wave radiated during insulation deterioration and confirming an abnormality of a switchboard has been proposed. The conventional electromagnetic wave detection method detects electromagnetic waves in the VHF and UHF bands in the frequency ranges of 30 Hz to 300 MHz, 300 MHz to 3 GHz, and exhibits high resonance and sensitivity, but is easily affected by vibration and external disturbance waves, and thus accurate degradation measurement. This is difficult.

In addition, in the prior art, it is not possible to confirm whether the initial installation environment and setting of the electromagnetic wave reception antenna have changed due to vibrations and dust generated in the switchgear and the motor control panel and the distribution panel, and the change in the internal environment and the installation environment of the switchgear and the motor control panel and the distribution panel. Also can not be confirmed.

Therefore, in the related art, malfunction of the electromagnetic wave reception antenna can be prevented due to a change in the installation environment.

Korean Registered Patent No. 0938883 (2010.01.19)

The present invention has been made to solve the above-mentioned problems, and the electromagnetic wave to check the normal operation of the electromagnetic wave receiving antenna installed in the switchgear and motor control panel, the distribution panel and the change of the installation environment by using the reference signal generator; It is to provide a switchgear, a motor control panel and a distribution panel having an arc and corona discharge monitoring and diagnosis function by ultraviolet detection.

In addition, the present invention measures the ultraviolet rays and electromagnetic waves emitted when a discharge occurs in the power distribution panel and motor control panel, power equipment installed inside the distribution panel and analyzed the measured data to the arc of the switchgear and motor control panel, the distribution panel and the arc due to disconnection Another object of the present invention is to provide a switchgear, a motor control panel, and a distribution panel having an arc and corona discharge monitoring and diagnosis function by detecting electromagnetic waves and ultraviolet rays to diagnose the occurrence of corona.

In order to achieve the above object, the switchgear and motor control panel, the distribution panel having the arc and corona discharge monitoring and diagnosis function by the electromagnetic wave and ultraviolet light detection according to the present invention radiates by the discharge generated in the power switchboard and motor control panel, power equipment inside the distribution panel Electromagnetic wave detection unit for measuring the frequency of the electromagnetic wave signal, ultraviolet ray detection unit for measuring the wavelength of the ultraviolet radiation emitted by the discharge generated in the power distribution panel, motor control panel, power equipment in the distribution panel, and frequency of the electromagnetic wave signal measured by the electromagnetic wave detection unit A reference wave generator for generating a reference signal with an intermediate frequency of the frequency band to which the frequency band belongs and a predetermined radio wave intensity; and receiving the electromagnetic wave signal through the electromagnetic wave detector, controlling the reference wave generator after a predetermined time. When generating the reference signal The received reference signal is received to determine whether the electromagnetic detection unit is normal according to whether the received intensity of the received reference signal is out of an acceptable range, and the frequency of the measured electromagnetic signal is collected according to the determination result. And a collecting unit collecting the wavelengths of ultraviolet rays measured by the ultraviolet detecting unit, and a diagnosing unit diagnosing the discharge form by analyzing the measurement data collected by the collecting unit.

The electromagnetic wave detector is characterized in that for measuring the frequency band of 0.1MHz ~ 800MHz.

The ultraviolet detection unit is characterized in that for measuring the ultraviolet wavelength band of 210nm ~ 400nm.

The allowable range is characterized in that the range of ± 10% of the propagation intensity.

The collecting unit checks whether the reception intensity of the electromagnetic wave signal detected by the electromagnetic wave detecting unit is within a reference range when the electromagnetic wave detecting unit is confirmed to be normal.

The reference range is characterized in that 42 ㏈㎶ / m ~ 70 ㏈㎶ / m.

The collection unit collects the frequency of the detected electromagnetic wave signal as measurement data if the received intensity of the detected electromagnetic wave signal is within a reference range, and if the received intensity of the detected electromagnetic wave signal is outside the reference range, It is characterized in that the frequency is not collected as measurement data.

The discharge form is characterized in that the arc or corona.

The present invention can determine whether the installation environment of the switchgear and the motor control panel, the distribution panel by checking whether the electromagnetic wave receiving antenna is installed in the first installed state using the reference signal generator, the change in the installation environment of the switchboard and motor control panel, distribution panel Accordingly, it is possible to prevent malfunction by adjusting the installation environment of the electromagnetic wave receiving antenna.

The present invention measures the ultraviolet rays and electromagnetic waves emitted when a discharge occurs in a power distribution panel and a motor control panel, a power device installed inside the distribution panel, and analyzes the measured data measured by the arc in the switchgear and motor control panel, the connection panel and disconnection Or you can diagnose the occurrence of corona.

1 is a block diagram showing a degradation diagnostic system of the switchgear according to the present invention.
Figure 2a is a block diagram showing a detection apparatus included in the degradation diagnostic system of the switchgear according to the present invention.
2B is a block diagram illustrating the diagnosis unit illustrated in FIG. 1.
3 is a circuit diagram of an amplifier provided in the electromagnetic wave detector illustrated in FIG. 2A.
FIG. 4 is a circuit diagram of an amplifier included in the ultraviolet detector illustrated in FIG. 2A.
5 is a flowchart illustrating a method for diagnosing degradation of a switchgear, a motor control panel, and a distribution panel according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The degradation diagnosis system proposed in the present invention can be applied to a distribution panel, a motor control center, a distribution panel, and the like.

1 is a block diagram showing a degradation diagnostic system of the switchgear according to the present invention, Figure 2a is a block diagram showing a detection device included in the degradation diagnostic system of the switchgear according to the present invention, Figure 2b is FIG. 3 is a block diagram illustrating the diagnosis unit, and FIG. 3 is a circuit diagram of an amplifier included in the electromagnetic wave detector illustrated in FIG. 2A, and FIG. 4 is a circuit diagram of the amplifier provided in the ultraviolet detector illustrated in FIG. 2A. In this embodiment, the case is applied to the switchgear has been described as an example.

Referring to the drawings, the degradation diagnosis system detects the insulation state of the switchboard 1 based on the detection device D for detecting a parameter required for the degradation diagnosis of the switchgear 1 and the data detected through the detector D. It includes a diagnostic unit 130 to diagnose. The enclosure of the switchboard 1 is made of metal, the enclosure is grounded, and shields external radio waves.

As shown in FIG. 2A, the detection apparatus D includes an electromagnetic wave detector 111, an ultraviolet ray detector 112, a reference wave generator 115, and a collector 120.

The electromagnetic wave detector 111 detects electromagnetic waves emitted when the series arc discharge or the corona discharge occurs in the switchboard 1. The series arc discharge is generated from an aged cable or deteriorated terminal in the switchgear 1, and the corona discharge is generated from a power transformer such as a metering outfit (MOF) installed in the switchgear and a bushing or support insulator of a transformer. do.

The electromagnetic wave detector 111 includes a receiving antenna (not shown) for receiving electromagnetic waves of a specific frequency band and an amplifier (see FIG. 3) for amplifying the magnitude of the electromagnetic signal received through the receiving antenna. The receiving antenna is implemented as a planar (disc) antenna measuring a frequency band of 0.1 MHz to 800 MHz.

The ultraviolet detection unit 112 measures the light spectrum represented by the series arc discharge generated in the power device installed inside the switchgear. The ultraviolet detector 112 includes an ultraviolet sensor (not shown) that detects an ultraviolet component generated when an arc discharge occurs, and an amplifier (see FIG. 4) that amplifies a signal measured by the ultraviolet sensor. The ultraviolet sensor measures the ultraviolet wavelength band of 210nm ~ 395nm. As shown in FIG. 4, the amplifier includes a light receiving unit, a detection impedance and an amplifier (AMP), and the signal measured by the light receiving unit is connected to an input terminal of the amplifier through the detection impedance.

The amplifiers (see FIGS. 3 and 4) provided at the output terminals of the electromagnetic wave detector 111 and the ultraviolet ray detector 112, respectively, are for detecting minute electromagnetic waves and ultraviolet rays. The amplifier of the electromagnetic wave detector 111 has a gain of 40 kHz and a frequency response of 50 kHz to 35 MHz (-3 kHz), and the amplifier of the ultraviolet detector 112 has a gain of 20 dB and a frequency response of DC to 45 kHz (-3 dB).

The electromagnetic wave detector 111 and the ultraviolet ray detector 112 may be provided in plural inside the switchgear.

The reference wave generator 115 is installed in the switchboard 1 to generate and emit a reference signal with an intermediate frequency of a frequency band to which the electromagnetic wave detected by the electromagnetic wave detector 111 belongs and a radio wave preset for the intermediate frequency. do. The reference wave generator 115 generates a reference electromagnetic wave (reference signal) at a predetermined intermediate frequency and a radio wave intensity of a radiation frequency band for each discharge state.

For example, when a corona is generated between the terminals, since the radiation frequency bands are 10 MHz to 20 MHz and 0.1 MHz to 0.4 MHz, the reference radio wave generator 115 determines the intermediate frequency 15 based on information previously set. It generates a reference signal with a radio wave strength of 50 전파 / m and a reference signal with an intermediate frequency of 0.2 MHz with a radio wave strength of 60 ㏈㎶ / m.

The collector 120 collects measurement data measured by the electromagnetic wave detector 111 and the ultraviolet ray detector 112. The measurement data includes the frequency and reception intensity of the electromagnetic wave detected by the electromagnetic wave detector 111, and the wavelength of the ultraviolet ray detected by the ultraviolet ray detector 112.

The collection unit 120 digitally measures the analog signals measured by the plurality of channels 121 for connection with the electromagnetic wave detector 111 and the ultraviolet ray detector 112 and the electromagnetic wave detector 111 and the ultraviolet ray detector 112. It includes a communication module 123 for enabling wired and wireless communication between an analog-digital converter 122 for converting into a signal and an external terminal (for example, the diagnosis unit 130).

The collection unit 120 generates a reference signal by controlling the reference wave generator 115 when a predetermined time (for example, 1 to 2 seconds) elapses after receiving the electromagnetic signal through the electromagnetic wave detector 111. At this time, the reference wave generator 115 controls the reference signal at a predetermined intermediate frequency and a radio wave intensity with respect to a frequency band to which the frequency of the electromagnetic wave signal detected by the electromagnetic wave detector 111 under the control of the collecting unit 120 belongs. Generate. In the present exemplary embodiment, a reference signal is generated by generating a reference signal with an intermediate frequency of the frequency band to which the frequency of the electromagnetic wave signal detected by the electromagnetic wave detector 111 belongs, and a predetermined radio wave intensity for the intermediate frequency, as an example. In consideration of environmental factors such as equipment layout and size of switchgear, it can change and set the frequency, propagation intensity and frequency of reference signal. The selector switch may be added to the generator 115. In other words, the preset frequency, radio wave strength, frequency of occurrence, etc. may be selectively implemented according to the site situation where the switchboard is installed.

The collection unit 120 measures the reception intensity of the reference signal received after the reference signal is generated, and checks whether the measured reception intensity is outside the allowable range. Here, the allowable range is ± 10% of the propagation intensity (generating intensity) of the reference signal when the reference signal is generated.

The collector 120 determines that the electromagnetic wave detector 111 operates normally when the received intensity of the received reference signal is within the reference range, and the electromagnetic wave signal received by the electromagnetic wave detector 111 is an arc or corona inside the switchboard. Recognize that the signal generated by can be normally received. Therefore, the collection unit 120 collects the measurement data measured by the electromagnetic wave detector 111 and the ultraviolet ray detector 112 and transmits the measurement data to the diagnostic unit 130 to perform the diagnostic operation by the diagnostic unit 130.

When collecting the measurement data, the collection unit 120 checks whether the reception intensity of the electromagnetic wave signal received through the electromagnetic wave detection unit 111 falls within a reference range when the electromagnetic wave detection unit 111 is determined to be normal. The reference range is 42 mW / m to 70 mW / m, and is set in consideration of the size of the designer and the switchboard and the radiation wave energy sensitivity.

If the received intensity of the received electromagnetic wave signal is within the reference range, the collecting unit 120 determines that the received electromagnetic wave signal is caused by an arc or corona in the switchboard, and thus, the collection of the electromagnetic wave signal detected by the electromagnetic wave detector 111. Collect the frequency as measurement data. On the other hand, if the reception intensity of the received electromagnetic wave signal does not fall within a certain range, the collection unit 120 determines that the received electromagnetic wave signal is caused by the environmental change of the distribution panel, and does not collect the frequency of the corresponding electromagnetic wave signal as measurement data. . In addition, the collection unit 120 notifies the administrator of a change in the installation environment of the electromagnetic wave detection unit 111 through a message or an alarm sound.

The collector 120 determines that the electromagnetic wave detector 111 is abnormally operated when the received intensity of the received reference signal is outside the allowable range, and notifies the manager. That is, since the switchboard 1 according to the present invention includes the reference wave generator 115, whether the installation environment of the electromagnetic wave detector 111 has changed from the initial setting due to contamination caused by vibration and dust generated in the switchboard 1. The installation environment of the switchgear 1 can be checked due to external factors such as the installation of equipment that can act as a radio wave generation source around the switchgear 1.

In addition, the collecting unit 120 may be manufactured in one module by integrating with the electromagnetic wave detecting unit 111 and the ultraviolet detecting unit 112.

The diagnostic unit 130 is connected to the collection unit 120 by wire or wirelessly to receive the measurement data collected by the collection unit 120 from the collection unit 120. The collection unit 120 measures the measurement data for the detected electromagnetic wave signal only when it is determined that the electromagnetic wave signal detected by the electromagnetic wave detector 111 is an electromagnetic signal due to an arc or a corona generated in the distribution panel. To send).

The diagnosis unit 130 diagnoses the discharge type (type) by analyzing the electromagnetic wave frequency and the ultraviolet wavelength measured through the electromagnetic wave detector 111 and the ultraviolet ray detector 112 based on the criteria shown in [Table 1]. Here, the discharge forms include corona and series arcs. Ultraviolet wavelength and frequency band of [Table 1] were selected as the band detected when corona or serial arc occurred through experiment.

2B, the diagnosis unit 130 includes a communication unit 131, an input unit 132, a notification unit 133, an output unit 134, a storage unit 135, and a controller 136.

The communication unit 131 receives measurement data collected from the collecting unit 120 through wired or wireless communication with the communication module of the collecting unit 120. For example, the communication unit 131 performs RS-232 communication.

In addition, the communication unit 131 transmits the diagnosis result diagnosed by the diagnosis unit 130 to the manager terminal through wireless communication under the control of the control unit 136.

The input unit 132 is for user input and is implemented as a keypad or a touch pad.

The alarm unit 133 outputs an alarm sound to the outside depending on whether an arc or corona is generated. In other words, the alarm unit 133 outputs an alarm sound when an arc or corona occurrence is detected, and does not perform an alarm sound output when an arc or corona occurrence is not detected.

The output unit 134 is for outputting measurement data and diagnostic results, and includes a display device and / or a speaker. The display device may be implemented as an LCD, a transparent display, an OLED, an LED display, or the like.

The storage unit 135 stores diagnostic software, measurement data, diagnostic results, and the like for deterioration diagnosis.

The controller 136 controls the operation of each component constituting the diagnosis unit 130, and analyzes the measurement data received through the communication unit 131 to diagnose the discharge form and the generation position.

In addition, the control unit 136 transmits a diagnosis result to the manager terminal through the communication unit 131. Therefore, the manager may monitor in real time whether the arc or corona is generated through the diagnosis result and measurement data notified by the diagnosis unit 130.

5 is a flowchart illustrating a method for diagnosing degradation of a switchgear, a motor control panel, and a distribution panel according to the present invention.

Referring to FIG. 5, the electromagnetic wave detector 111 and the ultraviolet ray detector 112 measure minute electromagnetic waves and ultraviolet rays generated from a power switchboard, an electric motor control panel, and a power device installed in the distribution panel (S101). The electromagnetic wave detector 111 and the ultraviolet ray detector 112 transmit the measured data to the collector 120. The collector 120 collects the measured data and transmits the measured data to the diagnosis unit 130.

In this case, when the electromagnetic wave signal is detected by the electromagnetic wave detector 111, the collecting unit 120 controls the reference electric wave generator 115 after a predetermined time elapses and the intermediate frequency of the frequency band to which the frequency of the detected electromagnetic wave signal belongs. A reference signal is generated and radiated with a propagation intensity preset for a frequency. The collection unit 120 receives the reference signal generated from the reference wave generator 115 through the electromagnetic wave detector 111 and checks the reception intensity of the reference signal. If the reception intensity of the reference signal is within the allowable range, it is determined that the electromagnetic wave detector 111 is normal. Here, the allowable range is within ± 10% of the generation intensity of the reference signal.

When the electromagnetic wave detection unit 111 is confirmed to be normal, the collection unit 120 confirms the reception intensity of the electromagnetic wave signal detected by the electromagnetic wave detection unit 111. When the received intensity of the detected electromagnetic wave signal is within the reference range, it is determined that the detected electromagnetic wave signal is generated by an arc or corona generated inside the distribution panel, the motor control panel, and the distribution panel, and collects the frequency of the corresponding electromagnetic wave signal as measurement data.

On the other hand, if the received intensity of the detected electromagnetic signal is outside the reference range, the frequency of the electromagnetic wave signal detected by the electromagnetic wave detector 111 is not collected as measurement data.

As described above, the present invention includes the reference wave generating unit 115, and checks whether the electromagnetic wave detecting unit 111 is initially installed due to contamination due to vibration and dust, etc., so that the environment of the distribution panel, the motor control panel, and the distribution panel is maintained. You can see the change. In addition, the present invention can confirm the change in the installation environment due to new external factors, such as the additional switchgear and motor control panel, the addition of equipment that can act as a radio wave generation source around the distribution panel. Therefore, the manager can predict the malfunction of the electromagnetic wave detection unit 111 according to the switchboard, the motor control panel, the distribution panel internal environment change, and the installation environment change in advance and prevent it.

In addition, the reference wave generator 115 may further include a test button externally, and generate a reference signal according to the operation of the button to test a change in the installation environment of the electromagnetic wave detector 111.

The control unit 136 of the diagnosis unit 130 receives measured data transmitted from the collection unit 120 through the communication unit 131, and analyzes the received measured data to diagnose a discharge type (type). (S102) That is, the diagnosis unit 130 selects any one of the diagnosis results of [Table 1] by analyzing the measurement data collected by the collection unit 120.

The controller 136 performs a corresponding operation according to the diagnosis result (S103). When the occurrence of an arc or corona is diagnosed, the controller 136 outputs an alarm sound through the notification unit 133 and transmits a diagnosis result to the manager terminal through the communication unit 131. The diagnosis results include whether discharge is generated and the type of discharge generated.

If the discharge is not detected, the control unit 136 transmits the measured data to the manager terminal through the communication unit 131 and performs the steps S101 to S103 again.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

111: electromagnetic wave detection unit
112: UV detection unit
115: reference wave generator
120: collector
130: diagnostic unit

Claims (8)

An electromagnetic wave detection unit measuring a frequency of an electromagnetic wave signal emitted by a discharge generated from a power distribution panel, a motor control panel, and a power device inside the distribution panel;
UV detection unit for measuring the wavelength of the ultraviolet radiation emitted by the discharge generated in the switchgear, motor control panel, power equipment in the distribution panel,
A reference radio wave generator for generating a reference signal with an intermediate frequency of a frequency band to which the frequency of the electromagnetic wave signal measured by the electromagnetic wave detector belongs and a radio wave preset for the intermediate frequency;
When receiving an electromagnetic wave signal through the electromagnetic wave detector, after a predetermined time elapses, the reference wave generator generates the reference signal, receives the generated reference signal, and whether the received intensity of the received reference signal is outside the allowable range. A collecting unit for determining whether the electromagnetic wave detecting unit is normal, collecting a frequency of the measured electromagnetic wave signal according to the determination result, and collecting wavelengths of ultraviolet rays measured by the ultraviolet detecting unit;
Switchgear and motor control panel having a diagnostic function for detecting the arc and corona discharge by the electromagnetic wave and ultraviolet radiation characterized in that it comprises a diagnostic unit for analyzing the measurement data collected by the collecting unit and the distribution panel. The method of claim 1,
The electromagnetic wave detection unit is a switchgear and motor control panel, a distribution panel having an arc and corona discharge monitoring and diagnostic function by detecting electromagnetic waves and ultraviolet rays, characterized in that measuring the frequency band of 0.1MHz ~ 800MHz. The method of claim 1,
The ultraviolet detection unit is a switchgear and motor control panel, a distribution panel having an arc and corona discharge monitoring and diagnosis function by electromagnetic and ultraviolet detection, characterized in that for measuring the ultraviolet wavelength band of 210nm ~ 400nm. The method of claim 1,
The permissible range is a switchgear and motor control panel, a distribution panel having an arc and corona discharge monitoring and diagnostic function by the electromagnetic wave and ultraviolet detection, characterized in that the range of ± 10% of the radio wave intensity. The method of claim 1,
The collection unit has an arc and corona discharge monitoring and diagnosis function by detecting electromagnetic waves and ultraviolet rays, characterized in that if the electromagnetic wave detection unit is confirmed to be normal, the reception intensity of the electromagnetic wave signal detected by the electromagnetic wave detection unit is within a reference range. Switchgear, motor control panel, distribution panel. The method of claim 5,
The reference range is 42 ㏈㎶ / m ~ 70 ㏈㎶ / m switchgear and motor control panel, the distribution panel having an arc and corona discharge monitoring and diagnostic function by the electromagnetic wave and ultraviolet detection. The method of claim 5,
The collection unit collects the frequency of the detected electromagnetic wave signal as measurement data if the received intensity of the detected electromagnetic wave signal is within a reference range, and if the received intensity of the detected electromagnetic wave signal is outside the reference range, A switchgear and a motor control panel and a distribution panel having an arc and corona discharge monitoring and diagnosis function by detecting electromagnetic waves and ultraviolet rays, characterized in that frequency is not collected as measured data. The method of claim 1,
The discharge type is a switchgear and motor control panel, a distribution panel having an arc and corona discharge monitoring and diagnostic function by the electromagnetic wave and ultraviolet light detection, characterized in that the arc or corona.

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