KR101559725B1 - Prediagnosis prevention device for switchgear - Google Patents

Prediagnosis prevention device for switchgear Download PDF

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Publication number
KR101559725B1
KR101559725B1 KR1020150039851A KR20150039851A KR101559725B1 KR 101559725 B1 KR101559725 B1 KR 101559725B1 KR 1020150039851 A KR1020150039851 A KR 1020150039851A KR 20150039851 A KR20150039851 A KR 20150039851A KR 101559725 B1 KR101559725 B1 KR 101559725B1
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South Korea
Prior art keywords
sensor
switchgear
ultrasonic
partial discharge
arc
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KR1020150039851A
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Korean (ko)
Inventor
신양섭
최인호
강성신
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선도전기주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Testing Relating To Insulation (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

An ultrasonic sensor (10), an electromagnetic wave sensor (12), and an arc sensor (18) installed in an operation switchboard;
A load current sensor (16) installed inside the switchgear and detecting a load current of the switchgear through a current transformer;
A temperature sensor (14) installed inside the switchboard to detect the temperature of the conductor contact portion and the insulator in the switchgear in a non-contact manner; And
When ultrasonic partial discharge and electromagnetic wave partial discharge are sensed within the switchgear within the sensing and sensing range provided by the sensors 10, 12, 14, 16 and 18, Information on "Ai (arc generation event)" according to the occurrence of the arc is displayed on the display unit 30 in the form of coordinates "Nae (ultrasonic pulse number)" according to the ultrasonic partial discharge, "Nrf And detects an abnormality relating to insulation deterioration in the switchboard by reflecting defect information preset in relation to the ultrasonic partial discharge and the electromagnetic wave partial discharge, And a signal processing unit (20) for judging whether the temperature of the insulator is abnormal or not.

Description

{Prediagnosis prevention device for switchgear}

The present invention relates to a switchboard diagnostic apparatus.

Industrialization, and informationization, and the ripple effect is increasing in the case of an accident of a power supply system of a power plant installed in a system. Accordingly, before the occurrence of an accident, various techniques for detecting an abnormal signal of the electric power facility and diagnosing the condition have been attempted.

Generally, when a high voltage is applied to an air-insulated power device, a discharge is generated in the air having a lower breakdown voltage than the solid insulator. Here, abundant free electrons, ions, excited atoms are generated and various deterioration actions It gets to the solid. As a result of the partial discharge erosion, the erosion of the whole area of the discharge part due to the discharge is generated first, then the discharge energy is concentrated on the local part and the discharge energy density of this part is increased. And eventually leads to destruction of the penetration through the tunnel.

Partial discharge occurs in most of the insulation deterioration process, resulting in high frequency voltage and current, acoustic signal, light, decomposition gas, odor and electromagnetic wave radiation phenomenon. Diagnostic methods have been developed to detect such physical phenomena and to determine an abnormal state of the device.

- Methods for detecting electromagnetic waves include very high frequency (VHF) and ultra-high frequency (UHF) band signals and TEV (Transient electromagnetic voltage ) Are detected and diagnosed.

- As a method for detecting a sound signal, a method of detecting an acoustic signal generated in a partial discharge using an ultrasonic sensor, an ultrasonic sensor for receiving, etc. is applied.

- When a high frequency voltage current is detected, if a partial discharge occurs in the power device (transformer), a pulsed discharge current flows in the ground circuit. The current pulse accompanying this discharge current is called a Rogowski coil type high frequency CT High-frequency CT) and a method of detecting discharge current in a high-pressure bushing.

Joule heat is generated by the conduction current caused by the voltage applied to the insulator installed and operated inside the switchgear. Besides, electrochemical deterioration due to ion conduction, thermal effect due to dielectric loss, electromagnetic force due to short circuit high current and high voltage, The thermal particle impact action due to the electrostatic force effect and the partial discharge and the chemical action due to the excited molecules and ions are generated, and the insulating material is deteriorated.

In general, there are many ways to determine the lifetime of a power device, but in particular, the lifetime of the insulation can be regarded as the lifetime of the device. However, in case of deterioration of the insulation, it is necessary to replace all of the insulation or replace it with a new one. In general, the life span of the insulation of the power equipment It becomes a life span.

The ultrasonic detection method is less susceptible to electromagnetic interference and can detect a signal without installing a partial discharge coupler. Also, in some environments where the device is used, it is possible to detect a more accurate partial discharge signal when used in combination with an electrical detection method. The advantage of the ultrasonic diagnosis is that it is possible to determine the location of the anomalous occurrence, which makes it easy to repair the anomalous area and minimizes repair cost and time.

The Φ-qn analysis technique for analyzing the phase (Φ), the magnitude (q) and the pulse generation number (n) of the partial discharge pulse is used to analyze the abnormal state due to the partial discharge applied to the conventional ultra high- Specifically, one cycle of the power source phase is divided into a certain number of phase angle windows, and a partial discharge is formed by the maximum and average size of the partial discharge generated in each phase window and the frequency of occurrence. In order to express the feature of the partial discharge occurrence distribution, the partial discharge type specified from the defect known by using the operator such as the kurtosis, the degree of distortion, the degree of correlation, the asymmetry, the peak number and the phase angle ratio of the discharge generation voltage, It is possible to analyze the cause of the defect by comparing it with a previously generated patten vector.

The Φ-qn analysis method and the pattern recognition method, which are mainly used in an ultra-high voltage power plant, detect and partially process the UHF band partial discharge signal, which complicates the hardware configuration and requires expensive diagnostic equipment and software .

When the partial discharge inside the switchgear is detected by using an electromagnetic sensor, there is a problem that a wrong signal is processed due to inflow of a broadcasting frequency of a mobile phone frequency, a TV radio,

Although the ultrasonic detection method is based on the detection of the signal of the mechanical wave generated from the discharge power source, the ultrasonic wave is not affected by electromagnetic waves. However, if the ultrasonic wave does not distinguish the external mechanical shock and the external noise, There is a problem that a wrong signal is processed and a wrong signal is generated.

On the other hand, the ultrasonic sensor is generally unable to directly measure the intrinsic partial discharge amount Q by using the magnitude (amplitude) of the vibration frequency period and the frequency.

When a partial discharge occurs in the electric power facility, a pulse current is generated and a signal having a wide frequency distribution ranging from an audible frequency to a very high frequency band is generated. In the acoustic (ultrasonic) measurement method, the ultrasonic wave is inputted to the ultrasonic sensor through pressure medium vibration wave through the medium inside the electric power facility, converts the inputted acoustic signal into an electric signal, amplifies and removes noise, The partial discharge amount can be indirectly measured.

The configuration of the ultrasonic measurement circuit is generally a sensor, an amplifier, and a filter which are an ultrasonic wave detecting unit, and amplifies and filters the ultrasonic waves inputted from the sensor into an appropriate size and frequency band to measure various characteristic values such as an ultrasonic wave size, occurrence frequency, .

Partial discharges can be caused by various types of defects, and the characteristics of the partial discharges are different according to the deterioration process for each room power source. The Φ-qn analysis method, which is a method of analyzing the pattern of the partial discharge based on the power phase, is used to estimate the degree of some kinds of defects.

(1) Registered Patent Publication No. 10-0931992 (Date of Publication: December 14, 2009) "System and method for self-diagnosing insulation deterioration and abnormal temperature" (2) 10-1077441 (Published Oct. 26, 2011) "Real-time Deterioration Detection Device Using Ultra-High Frequency Vibration Sensor and Switchboard Using the Same" (3) Patent Registration No. 10-1070832 (Published Oct. 10, 2011) &Quot; Method and apparatus for predicting insulation deterioration of power < RTI ID = 0.0 >< / RTI &

The present invention has been devised to solve the above-mentioned problems, and it is an object of the present invention to provide a system and method for detecting ultrasonic waves, electromagnetic waves and arcs due to discharges inside a power- It is an object of the present invention to provide a power and room diagnosis apparatus for determining a deterioration and an abnormal state in a power and room system in advance by combining a local overheat accompanied by a current carrying capability and thermal deterioration of an insulating material.

In order to achieve this object,

According to an aspect of the present invention,

An ultrasonic sensor 10, an electromagnetic wave sensor 12, and an arc sensor 18 installed inside the operation switchboard;

A load current sensor (16) installed inside the switchgear and detecting a load current of the switchgear through a current transformer;

A temperature sensor (14) installed inside the switchboard to detect the temperature of the conductor contact portion and the insulator in the switchgear in a non-contact manner; And

When ultrasonic partial discharge and electromagnetic wave partial discharge are sensed within the switchgear within the sensing and sensing range provided by the sensors 10, 12, 14, 16 and 18, Information on "Ai (arc generation event)" according to the occurrence of the arc is displayed on the display unit 30 in the form of coordinates "Nae (ultrasonic pulse number)" according to the ultrasonic partial discharge, "Nrf And detects an abnormality relating to insulation deterioration in the switchboard by reflecting defect information preset in relation to the ultrasonic partial discharge and the electromagnetic wave partial discharge, And a signal processing unit (20) for judging whether the temperature of the insulator is abnormal or not;

And a control unit.

The signal processing unit 20 recognizes each of the sensing signals provided from the ultrasonic sensor 10 and the electromagnetic wave sensor 12 at the same time as a certain occurrence frequency and uses it as an intrinsic partial discharge signal for use in the determination of the insulation deterioration.

The electromagnetic wave sensor 12 is patterned on the surface of the parabolic surface with the center of the parabolic surface as the center, and the electromagnetic wave is focused on the surface of the parabolic surface, Is effectively performed.

The signal processing unit 20 receives each sensing signal provided from the ultrasonic sensor 10 and the electromagnetic sensor 12 through a low-pass filter or a high-pass filter to minimize a signal input in a band corresponding to noise. do.

The arc sensor 18 senses the occurrence of an arc with respect to the generation of light exceeding the reference reference light quantity and determines the occurrence of an arc in consideration of the rate of change of the light quantity with respect to the quantity of light corresponding to the sunlight, And does not detect any other light as arcing.

When the temperature deviation at which the temperature of one phase of the three-phase alternating current inside the switchgear increases is larger than the reference value, the signal processing unit 20 calculates the slope of the temperature rise from the reference value in combination with the load current magnitude of the switchgear Is displayed on the display unit (30) when the electric current is suddenly appeared to be higher than the reference value, thereby alerting the abnormal state of the conductor contact portion and the insulator in the switchgear.

The present invention has been made in view of the above problems, and it is an object of the present invention to improve the reliability of detection of an intrinsic partial discharge signal by simultaneously sensing electromagnetic waves and ultrasonic signals generated in a medium frequency band generated during insulation deterioration in a switchboard, "Nae (ultrasonic pulse number)" according to the ultrasonic partial discharge, "Nrf (electromagnetic wave pulse number)" according to the electromagnetic partial discharge and "Ai (arc occurrence event)" according to the arc occurrence are displayed in the coordinate area It is possible to detect an abnormality of the power supply performance abnormality due to the insulation deterioration in the interior of the switchgear in advance by reflecting the defect information preset in relation to the ultrasonic partial discharge and the electromagnetic partial discharge.

1 is a block diagram showing an embodiment of a power and room diagnosis apparatus according to the present invention.
FIGS. 2 to 4 are views showing examples in which the ultrasonic sensor and the electromagnetic wave sensor shown in FIG. 1 are implemented.
FIG. 5 is a graph showing an example of the determination of the insulation performance abnormality of the signal processing unit shown in FIG. 1. FIG.
Fig. 6 is a table showing examples of determination of abnormality in electrification performance of the signal processing unit shown in Fig. 1. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of a power and room diagnosis apparatus according to the present invention. The ultrasonic sensor 10, the electromagnetic wave sensor 12, the temperature sensor 14, the load current sensor 16, the arc sensor 18, A signal processing section 20 and a display section 30.

2 to 4 are views showing examples of the implementation of the ultrasonic sensor 10 and the electromagnetic wave sensor 12 shown in FIG.

FIG. 5 is a graph showing an example of the insulation performance abnormality determination of the signal processing unit 20 shown in FIG. 1, and FIG. 6 is a table showing a determination example of the abnormality in the energization performance of the signal processing unit 20 shown in FIG.

Hereinafter, the present invention will be described in detail.

1 to 6, the ultrasonic sensor 10, the electromagnetic wave sensor 12, and the arc sensor 18 are installed inside the operation &

2 to 4, the ultrasonic sensor 10 protrudes from the center of the parabolic surface of the concave portion having the parabolic surface to effectively perform the ultrasonic wave collecting And the electromagnetic wave sensor 12 is patterned around the center of the parabolic surface on the surface of the parabolic surface to effectively perform the electromagnetic wave focusing.

On the other hand, one end of the supporting column is coupled to the center of the back surface of the concave portion, the other end of the supporting column is coupled to the spherical object, and the spherical shaped object is loosely and properly buried in the base, The ultrasonic sensor 10 and the electromagnetic sensor 12 can freely adjust the direction of the corresponding ultrasonic waves and electromagnetic waves.

The arc sensor 18 senses the arc generation with respect to the light generation over the sensing reference light quantity and judges whether or not an arc is generated in consideration of the variation rate of the light quantity with respect to the light quantity corresponding to the solar light. It is preferable that the light is not detected as arcing.

The load current sensor 16 is installed inside the switchgear and detects the load current of the switchgear through the current transformer and provides it to the signal processor 20.

The temperature sensor 14 is provided inside the power switchboard to detect the temperature of the conductor contact portion and the insulator inside the power switchboard in a non-contact manner and provides the signal to the signal processor 20.

The signal processing unit 20 receives the sensing signals provided from the sensors 10, 12, 14, 16 and 18, detects the ultrasonic partial discharge and the electromagnetic partial discharge within the power supply and distribution panel, Information on "Ai (arc generation event)" in accordance with the occurrence of an arc and "Nrf (number of electromagnetic wave pulses)" in accordance with the partial discharge of electromagnetic wave and "Nae (ultrasonic pulse number) And detects an abnormality relating to insulation deterioration inside the switchgear by reflecting preset defect information related to the ultrasonic partial discharge and the electromagnetic partial discharge, and judges from the temperature sensing signal provided from the temperature sensor (14) It is determined whether or not the temperature is abnormal.

It is preferable that the signal processing unit 20 recognize each of the detection signals provided from the ultrasonic sensor 10 and the electromagnetic wave sensor 12 at the same time as a certain occurrence frequency to be an intrinsic partial discharge signal and use it for the insulation deterioration determination.

In addition, the signal processing unit 20 may receive each sensing signal provided from the ultrasonic sensor 10 and the electromagnetic sensor 12 through a low-pass filter or a high-pass filter to minimize the inflow of signals in a band corresponding to noise.

When the temperature deviation at which the temperature rises above any one of the three-phase alternating currents in the switchgear 20 is larger than the reference value, the signal processing unit 20 determines that the slope of the temperature rise is higher than the reference value It is preferable to display the corresponding portion on the display unit 30 to warn the abnormal state of the conductor contact portion and the insulator inside the power transmission / distribution panel.

There is a large difference in the values detected between the ultrasonic sensor 10 and the electromagnetic wave sensor 12 with respect to the same partial discharge amount (PD value) in the case of an insulation abnormality.

They are combined and labeled as Safety, Caution, and Warning according to the equivalent PPS (Pulse Per Second) value. At this time, if the arc signal is detected in the step state, it is warned as "dangerous".

The signal processing unit 20 described above can determine the insulation performance abnormality as shown in the graph of FIG.

Here, Nequiv: Equivalent PPS value in the ultrasonic sensor 10 and the electromagnetic sensor 12 with respect to the same apparent partial discharge amount (recognized as an (equivalent) signal only at the time of simultaneous detection of ultrasonic waves and electromagnetic waves)

Ai: Arcing event

Ttime: Time of signal and event occurrence

Further, the signal processing unit 20 can determine the disturbance performance abnormality as shown in the table of Fig.

Here, the temperature deviation between the phases: the maximum value of the maximum temperature deviation between A-B, B-C and A-C per unit time

Temperature gradient: The maximum value of the gradient of temperature change in each phase per unit time

Average load current: 3-phase load current average value

On the other hand, the display unit 30 is not attached to each of a plurality of switchboards, but is installed separately and divides a plurality of pieces of status information into one screen so as to reduce the price and centralize information. So as to share status information of a plurality of switching and power distribution boards.

As described above, according to the present invention, the detection of the intrinsic partial discharge signal is improved by simultaneously sensing the electromagnetic wave and the ultrasonic signal in the medium-frequency band generated during the insulation deterioration in the switchgear and the insulation deterioration inside the power- Information of "Nae (ultrasonic pulse number)" according to ultrasonic partial discharge, "Nrf (number of electromagnetic wave pulses)" according to electromagnetic partial discharge and "Ai (arc occurrence event) And it is possible to detect an abnormality of power supply performance abnormality due to insulation deterioration in the interior of the switchgear in advance by reflecting defective information set in advance in relation to ultrasonic partial discharge and electromagnetic wave partial discharge.

In addition, it is possible to know the magnitude of the load current provided from the current transformer by using a non-contact type temperature sensor, which is frequently caused in the power transmission / It is possible to display the warning on the display unit 30 so that the operator can see the operation abnormality and promptly perform the corresponding action.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

10: Ultrasonic sensor
12: Electromagnetic wave sensor
14: Temperature sensor
16: Load current sensor
18: arc sensor
20: Signal processor
30:

Claims (6)

An ultrasonic sensor 10, an electromagnetic wave sensor 12, and an arc sensor 18 installed inside the operation switchboard;
A load current sensor (16) installed inside the switchgear and detecting a load current of the switchgear through a current transformer;
A temperature sensor (14) installed inside the switchboard to detect the temperature of the conductor contact portion and the insulator in the switchgear in a non-contact manner; And
When ultrasonic partial discharge and electromagnetic wave partial discharge are sensed within the switchgear within the sensing and sensing range provided by the sensors 10, 12, 14, 16 and 18, Information on "Ai (arc generation event)" according to the occurrence of the arc is displayed on the display unit 30 in the form of coordinates "Nae (ultrasonic pulse number)" according to the ultrasonic partial discharge, "Nrf And detects an abnormality relating to insulation deterioration in the switchboard by reflecting defect information preset in relation to the ultrasonic partial discharge and the electromagnetic wave partial discharge, And a signal processing unit (20) for judging whether the temperature of the insulator is abnormal or not;
And a control unit for controlling the power of the vehicle.
The method according to claim 1,
Wherein the signal processing unit (20) recognizes each of the sensing signals provided from the ultrasonic sensor (10) and the electromagnetic wave sensor (12) at the same time as a certain occurrence frequency and uses it for the determination of the insulation deterioration Diagnostic device.
The method according to claim 1,
The electromagnetic wave sensor 12 is patterned on the surface of the parabolic surface with the center of the parabolic surface as the center, and the electromagnetic wave is focused on the surface of the parabolic surface, Wherein the controller is operative to effectively perform the first and second control signals.
The method according to claim 1,
The signal processing unit 20 receives each sensing signal provided from the ultrasonic sensor 10 and the electromagnetic sensor 12 through a low-pass filter or a high-pass filter to minimize a signal input in a band corresponding to noise. The power supply system.
The method according to claim 1,
The arc sensor 18 senses the occurrence of an arc with respect to the generation of light exceeding the reference reference light quantity and determines the occurrence of an arc in consideration of the rate of change of the light quantity with respect to the quantity of light corresponding to the sunlight, And does not detect any other light as an arc.
The method according to claim 1,
When the temperature deviation at which the temperature of one phase of the three-phase alternating current inside the switchgear increases is larger than the reference value, the signal processing unit 20 calculates the slope of the temperature rise from the reference value in combination with the load current magnitude of the switchgear Is displayed on the display unit (30) when the electric power is suddenly displayed on the display unit (30), and warns the abnormal state of the conductor contact portion and the insulator in the switchgear.
KR1020150039851A 2015-03-23 2015-03-23 Prediagnosis prevention device for switchgear KR101559725B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957409B1 (en) 2018-10-25 2019-03-14 김병근 Distribution Board with Earthquake Detection and Self-diagnosis Function(High-voltage Switchgear, Low-voltage Switchgear, Motor Control Center, Cabinet Panel)
KR102066535B1 (en) * 2019-07-04 2020-02-11 한광전기공업주식회사 Partial discharge detection system using optical fiber ultrasonic sensor in high voltage power system
CN113325257A (en) * 2021-05-27 2021-08-31 云南电网有限责任公司电力科学研究院 Method for judging arc process of arc extinguish chamber by using circuit breaker radiation electromagnetic wave signal
CN113341277A (en) * 2021-04-19 2021-09-03 云南电网有限责任公司临沧供电局 Insulator fault assessment method based on multi-frequency ultrasonic waves and experimental platform thereof
KR102525869B1 (en) 2022-12-06 2023-04-26 삼풍전기 주식회사 Optoelectronic sensor with a function to simultaneously detect fire and discharging arc occurring in the switchboard and to find the occuring location and control device thereof
CN117892067A (en) * 2024-03-15 2024-04-16 国网上海市电力公司 Low-frequency current partial discharge monitoring anti-interference method, device, equipment and medium

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957409B1 (en) 2018-10-25 2019-03-14 김병근 Distribution Board with Earthquake Detection and Self-diagnosis Function(High-voltage Switchgear, Low-voltage Switchgear, Motor Control Center, Cabinet Panel)
KR102066535B1 (en) * 2019-07-04 2020-02-11 한광전기공업주식회사 Partial discharge detection system using optical fiber ultrasonic sensor in high voltage power system
CN113341277A (en) * 2021-04-19 2021-09-03 云南电网有限责任公司临沧供电局 Insulator fault assessment method based on multi-frequency ultrasonic waves and experimental platform thereof
CN113325257A (en) * 2021-05-27 2021-08-31 云南电网有限责任公司电力科学研究院 Method for judging arc process of arc extinguish chamber by using circuit breaker radiation electromagnetic wave signal
CN113325257B (en) * 2021-05-27 2023-01-20 云南电网有限责任公司电力科学研究院 Method for judging arc process of arc extinguish chamber by using circuit breaker radiation electromagnetic wave signal
KR102525869B1 (en) 2022-12-06 2023-04-26 삼풍전기 주식회사 Optoelectronic sensor with a function to simultaneously detect fire and discharging arc occurring in the switchboard and to find the occuring location and control device thereof
CN117892067A (en) * 2024-03-15 2024-04-16 国网上海市电力公司 Low-frequency current partial discharge monitoring anti-interference method, device, equipment and medium
CN117892067B (en) * 2024-03-15 2024-05-28 国网上海市电力公司 Low-frequency current partial discharge monitoring anti-interference method, device, equipment and medium

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