CN117054833A - Method for monitoring partial discharge signals of switch cabinet on line - Google Patents
Method for monitoring partial discharge signals of switch cabinet on line Download PDFInfo
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- CN117054833A CN117054833A CN202311043047.1A CN202311043047A CN117054833A CN 117054833 A CN117054833 A CN 117054833A CN 202311043047 A CN202311043047 A CN 202311043047A CN 117054833 A CN117054833 A CN 117054833A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
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- 238000004458 analytical method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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- 230000036760 body temperature Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000010835 comparative analysis Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
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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
- 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
Abstract
The invention relates to a method for monitoring partial discharge signals of a switch cabinet on line, which comprises the following steps: s1, obtaining partial discharge signals on a switch cabinet through a sensor; s2, amplifying the discharge signal by using a signal amplifier, and converting the electric signal into a digital signal by using a digital converter; s3, performing blind signal processing on the digital signals, determining fault information of the multiple partial discharge sources and removing the fault information; s4, reprocessing the partial discharge signals, transmitting the judged partial discharge signals into a background terminal, comparing and analyzing waveforms of the partial discharge signals of the switch cabinet, and finally determining specific data parameters of the partial discharge signals; s5, transmitting the digital signal data to a platform display through a controller. The beneficial effects are that: the system solves the technical problems that in the offline application process of the system, fault hidden dangers cannot be timely monitored, power failure installation is needed, a signal needs to be led out from a high-pressure chamber, automatic alarm and positioning cannot be achieved, and complex database comparison is needed.
Description
Technical Field
The invention relates to the technical field of a switch cabinet partial discharge monitoring method, in particular to a method for monitoring a switch cabinet partial discharge signal on line.
Background
Partial discharge is a pulsed discharge that produces a series of physical and chemical changes in the interior and surrounding space of the electrical device, such as optical, acoustic, electrical and mechanical vibrations, which are accompanied by the partial discharge to provide a detection signal for monitoring the internal insulation state of the electrical device. When an insulation defect occurs inside the high-voltage electrical equipment, the generation of a partial discharge signal is accompanied. Through detection and analysis of the partial discharge signals, whether insulation hidden danger exists in the high-voltage electrical equipment can be judged, and potential accidents are prevented from being further expanded.
Because the equipment insulation may have potential problems such as uneven thickness, excessive bubbles in the inside and the like when leaving a factory, after the equipment is electrified for a long time, the local electric field intensity in the dielectric medium or on the surface is too high, and the electric discharge which is caused by the breakdown of part of the equipment insulation system is caused by the long time left and right downwards, and the electric discharge can occur near a conductor (electrode) or at other positions. It causes direct collision of charged particles, resulting in severe damage such as localized heating and even high temperatures.
The detection of partial discharge of a switchgear is generally carried out by the following method:
when the operation and maintenance personnel patrol and examine, can test all switch cabinets in the switch chamber fast, as the local discharge of an effective switch cabinet and patrol and examine the instrument, when there is the partial discharge phenomenon in scene, hand-held type equipment can detect relevant data on the spot to directly show partial discharge amplitude magnitude, pulse number and discharge intensity on hand-held type equipment, can hear the discharge sound, but in the off-line application process, can't monitor the trouble hidden danger in time.
The mobile type is used for upgrading and developing application, namely a TEV sensor and an ultrasonic sensor are arranged in a switch cabinet to form a 24-hour online detection unit, and then an online monitoring system is formed by a monitoring host with a communication interface, so that the conversion from mobile type application to online type application is realized. Because the sensor is installed in the high-voltage chamber, the switch cabinet is required to be installed in a power failure mode, however, the power failure is required to be installed, a signal is required to be led out of the high-voltage chamber through a lead wire, automatic alarming and positioning cannot be achieved, and complex database comparison is required.
Disclosure of Invention
In order to solve the technical problems that in the offline application process of the system, fault hidden danger cannot be monitored in time, power failure is needed to install, a signal needs to be led out from a high-voltage chamber, automatic alarm and positioning cannot be achieved, and complex database comparison is needed, the invention provides a method for monitoring a partial discharge signal of a switch cabinet on line.
The invention is realized by adopting the following technical scheme: the method for monitoring the partial discharge signal of the switch cabinet on line is characterized by comprising the following steps of:
s1, obtaining partial discharge signals on a switch cabinet through a sensor;
s2, amplifying the discharge signal by using a signal amplifier, and converting the electric signal into a digital signal by using a digital converter;
s3, performing blind signal processing on the digital signals, determining fault information of the multiple partial discharge sources and removing the fault information;
s4, reprocessing the partial discharge signals, transmitting the judged partial discharge signals into a background terminal, comparing and analyzing waveforms of the partial discharge signals of the switch cabinet, and finally determining specific data parameters of the partial discharge signals;
s5, transmitting the digital signal data to a platform display through a controller.
Further, the sensor is an ultrasonic sensor, a UHF sensor or a TEV sensor, and the sensor is installed outside the switch cabinet by adsorption when the power is cut off or when the power is not cut off.
Further, in the step 3, the angle of arrival or the direction of arrival of the partial discharge source is determined by blind beam forming, and the position of the partial discharge source is determined according to the angle of arrival or the direction of arrival.
Further, in the step 4, the comparison analysis of the waveforms of the partial discharge signals on the switch cabinet can compare the period and the amplitude data parameters of the waveforms, and compare the waveforms with the waveforms of the original normal switch cabinet equipment, and the specific data parameters of the partial discharge signals can be intuitively known through a tree diagram or a positive-to-negative diagram.
Further, the digital signal output end is connected with an audible and visual alarm through a controller.
Compared with the prior art, the invention has the beneficial effects that:
1. this patent adopts ultrasonic wave, UHF or TEV and two unification detection technique, can also monitor cubical switchboard cabinet body temperature simultaneously. The core technology of the product is electromagnetic wave space fault early warning technology, realizes anti-interference and no false alarm, has strong installation advantages, does not need power failure installation, and is a switch cabinet partial discharge monitoring device for non-contact monitoring equipment operation state, which has AI intelligence and can automatically identify and position faults;
2. the interference signals in the digital radio frequency information are restrained by adopting blind beam forming, and the useful signals and the interference signals are separated, so that the identification is more accurate and flexible, the partial discharge signals in the equipment are comprehensively and perfectly detected, the interference degree of an external interference signal source on the detection of the partial discharge signals can be maximally reduced, the monitoring accuracy of the partial discharge signals is ensured, and the detection error of the partial discharge signals is reduced.
Drawings
FIG. 1 is a schematic flow chart of the monitoring method of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
Referring to fig. 1, a method for online monitoring partial discharge signals of a switch cabinet is characterized by comprising the following steps:
s1, obtaining partial discharge signals on a switch cabinet through a sensor;
s2, amplifying the discharge signal by using a signal amplifier, and converting the electric signal into a digital signal by using a digital converter;
s3, performing blind signal processing on the digital signals, determining fault information of the multiple partial discharge sources and removing the fault information;
s4, reprocessing the partial discharge signals, transmitting the judged partial discharge signals into a background terminal, comparing and analyzing waveforms of the partial discharge signals of the switch cabinet, and finally determining specific data parameters of the partial discharge signals;
s5, transmitting the digital signal data to a platform display through a controller.
The specific embodiment of the scheme is that the sensor is an ultrasonic sensor, a UHF sensor or a TEV sensor, and the working frequency band of the UFH sensor is 300-1500 MHz, so that the interference can be effectively avoided, and the UFH sensor has stronger anti-interference capability; the circularly polarized omnidirectional receiving antenna can be used for non-contact monitoring of the partial discharge signal of the switch cabinet in the power distribution room, and is safe and efficient; the installation is carried out without power failure, and the normal operation of the equipment is not affected; complex field interference is automatically removed through a special noise filtering channel, and the accuracy of a test result is ensured; the double test channels are arranged, so that data comparison can be performed, and the working efficiency can be improved; the partial discharge AI analysis function algorithm with the expert data analysis function is provided, so that analysis and judgment can be automatically assisted, and human misjudgment can be reduced.
The embodiment of the scheme is that a real-time online detection technology is adopted, the switch cabinet forms a switch cabinet partial discharge online monitoring system by installing the partial discharge monitoring device, the state of the switch cabinet is monitored in real time, early warning can be carried out in time when a problem is found, and the partial discharge sensor part can be directly adsorbed and installed outside the switch cabinet without power failure installation.
In the specific embodiment of the scheme, in the step 3, the angle of arrival or the direction of arrival of the partial discharge source is determined through blind beam forming, and the position of the partial discharge source is determined according to the angle of arrival or the direction of arrival, in the step 4, the period and the amplitude data parameter of the waveform can be compared through the comparative analysis of the waveform of the partial discharge signal on the switch cabinet, and compared with the waveform of the original normal switch cabinet equipment, and the specific data parameter of the partial discharge signal can be intuitively known through a tree diagram or a positive-to-negative diagram.
The specific embodiment of the scheme is that the digital signal output end is connected with an audible and visual alarm through a controller.
The method and the device can help users to realize the operation state partial discharge real-time monitoring and operation and maintenance big data monitoring analysis of the power distribution equipment, and improve the management efficiency; the accident potential caused by inconvenient long-period inspection can be reduced, and the operation safety of equipment is ensured. All four typical defects possibly occurring in insulators, circuit breakers, cables and the like in the switch cabinet can be automatically identified: air gap discharge (such as defect of factory design of a contact box), surface discharge (dirt accumulation and wetting), suspension point discharge (screw loosening of phase bus bar), corona discharge (cable sheath damage).
The system has high sensitivity (1 pC discharge can be measured at a distance of 10 meters), has strong anti-interference capability, can detect partial discharge by detecting an ultrahigh frequency (adjustable 300-3000 MHz) signal in electromagnetic waves emitted in the switch cabinet, and avoids other periodic interference signals (mostly within a 300MHz range) under corona (200 MHz) which is difficult to avoid in an electrical test method.
The specific embodiment of the scheme is that the identification of the partial discharge is mainly performed by comprehensively analyzing the phase characteristics and the waveform characteristics of the partial discharge at present. The phase characteristics are symmetry about a time axis and that discharge pulses occur near peaks and valleys in a power frequency signal period.
According to the specific embodiment of the scheme, through the signal amplification, conversion and fault information elimination, the colleague can effectively obtain the position information of partial discharge by observing and comparing correct data information, so that accurate judgment and analysis are carried out on the position information, and finally the accurate position information of the partial discharge can be obtained.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (5)
1. The method for monitoring the partial discharge signal of the switch cabinet on line is characterized by comprising the following steps of:
s1, obtaining partial discharge signals on a switch cabinet through a sensor;
s2, amplifying the discharge signal by using a signal amplifier, and converting the electric signal into a digital signal by using a digital converter;
s3, performing blind signal processing on the digital signals, determining fault information of the multiple partial discharge sources and removing the fault information;
s4, reprocessing the partial discharge signals, transmitting the judged partial discharge signals into a background terminal, comparing and analyzing waveforms of the partial discharge signals of the switch cabinet, and finally determining specific data parameters of the partial discharge signals;
s5, transmitting the digital signal data to a platform display through a controller.
2. The method for monitoring the partial discharge signal of the switch cabinet on line according to claim 1, wherein the sensor is an ultrasonic sensor, a UHF sensor or a TEV sensor, and the sensor is installed in a mode of installing an object in a high-voltage cable chamber when power is cut off or in a mode of installing the object outside the switch cabinet through adsorption when power is not cut off.
3. The method for on-line monitoring of partial discharge signals of a switchgear according to claim 1, wherein in the step 3, the angle of arrival or the direction of arrival of the partial discharge source is determined by blind beam forming, and the position of the partial discharge source is determined according to the angle of arrival or the direction of arrival.
4. The method for on-line monitoring of partial discharge signals of a switchgear according to claim 1, wherein in the step 4, the comparison analysis of waveforms of the partial discharge signals on the switchgear can compare the period and amplitude data parameters of the waveforms, and compare the waveforms with the waveforms of the original normal switchgear equipment, so that specific data parameters of the partial discharge signals can be intuitively known through a tree diagram or a positive-to-negative diagram.
5. The method for on-line monitoring of partial discharge signals of a switch cabinet according to claim 1, wherein the digital signal output end is connected with an audible and visual alarm through a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311043047.1A CN117054833A (en) | 2023-08-18 | 2023-08-18 | Method for monitoring partial discharge signals of switch cabinet on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311043047.1A CN117054833A (en) | 2023-08-18 | 2023-08-18 | Method for monitoring partial discharge signals of switch cabinet on line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117054833A true CN117054833A (en) | 2023-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311043047.1A Pending CN117054833A (en) | 2023-08-18 | 2023-08-18 | Method for monitoring partial discharge signals of switch cabinet on line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117054833A (en) |
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2023
- 2023-08-18 CN CN202311043047.1A patent/CN117054833A/en active Pending
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