CN-115453299-B - GIS partial discharge laboratory effective simulation and multisource detection system and method

CN115453299BCN 115453299 BCN115453299 BCN 115453299BCN-115453299-B

Abstract

The invention discloses a GIS partial discharge laboratory effective simulation and multisource detection system and method, which utilize a pressurizing circuit module to raise test voltage to initial partial discharge voltage and output pulse current signals and power frequency periodic signals, collect pulse current signals, high-frequency electromagnetic wave signals, ultrasonic signals and optical signals generated by partial discharge in a GIS, judge the occurrence of the partial discharge in the GIS, obtain the discharge quantity and discharge state of the partial discharge through a pulse current method, simultaneously obtain time and phase information generated by the partial discharge through the power frequency periodic signals, and obtain the GIS internal insulation fault information through detecting and decomposing the composition components and concentration of the gas after the partial discharge experiment is completed. The invention can realize the effective simulation of partial discharge of the real GIS in a laboratory under the condition of not damaging the GIS body.

Inventors

YANG XU
HUANG QINQING
ZHOU WEN
ZHANG GUOZHI
CHEN XIAOXIN
LIU YI
CHENG LIN
JIANG YI
LUO CHUANXIAN
ZHANG JING
WEN HAO
QIU HU
CHENG LIFENG

Assignees

国网电力科学研究院武汉南瑞有限责任公司
国网电力科学研究院武汉南瑞有限责任公司
国网电力科学研究院有限公司
国网电力科学研究院有限公司
国网浙江省电力有限公司电力科学研究院
国网浙江省电力有限公司电力科学研究院
国网浙江省电力有限公司
国网浙江省电力有限公司

Dates

Publication Date: 20260421
Application Date: 20221031
Priority Date: 20221031

Claims (7)

1. A method for effectively simulating and detecting multiple sources based on a GIS partial discharge laboratory is characterized in that a pressurizing circuit module of the system is used for raising test voltage to initial partial discharge voltage Ui, detecting impedance is used for calibrating discharge quantity of a pulse current method, collecting pulse current signals generated by partial discharge of a test defect model in the test pressurizing process, the pressurizing circuit module is used for outputting the pulse current signals and power frequency periodic signals to an oscilloscope, an ultrahigh frequency sensor is used for detecting high-frequency electromagnetic wave signals generated by partial discharge of the test defect model, outputting the high-frequency electromagnetic wave signals to the oscilloscope through a coaxial signal wire, an ultrasonic sensor is used for detecting ultrasonic signals generated by partial discharge of the test defect model, outputting the ultrasonic signals to the oscilloscope through a coaxial signal wire, a fluorescent fiber sensor is used for detecting optical signals generated by partial discharge of the test defect model, outputting the optical signals to the oscilloscope through the coaxial signal wire, displaying the pulse current signals, the high-frequency electromagnetic wave signals, the ultrasonic signals and the optical signals, judging the occurrence of internal partial discharge, obtaining the quantity of the partial discharge through the pulse current method, the ultrahigh frequency sensor is used for detecting the high-frequency electromagnetic wave signals generated by partial discharge of the test defect model, the gas phase signals and the gas chromatograph, and the gas chromatograph is used for detecting the partial discharge information generated by partial discharge of the gas phase detector after the partial discharge of the gas chromatograph is detected, and the gas chromatograph is detected at the time is detected, and the gas phase information is obtained at the time of the gas chromatograph is obtained, acquiring insulation fault information in a GIS; The test defect model comprises a free metal particle discharge test defect model, wherein the model comprises a metal guide rod, a high-voltage electrode, a ground electrode and metal particles, wherein the middle of the metal guide rod is bent to be a right angle, one end of the metal guide rod can be matched with a high-voltage end outlet of a basin-type insulator, the other end of the metal guide rod can fix the high-voltage electrode of the test defect, the test defect model is placed in a real GIS test cavity, the high-voltage electrode of the test defect model is connected to the high-voltage end of the basin-type insulator by the metal guide rod, and the ground electrode of the test defect model is connected to the ground wire by a metal copper wire through an organic glass flange plate; The effective simulation and multi-source detection method comprises the following steps: Step 1, calibrating the discharge amount of a pulse current method; Step 2, raising the test voltage to be the initial partial discharge voltage Ui, and simultaneously outputting a pulse current signal and a power frequency periodic signal to an oscilloscope; Step 3, collecting pulse current signals generated by partial discharge in the GIS, and stopping pressurizing by the pressurizing circuit module if the obvious pulse current signals exist on the oscilloscope, and continuously pressurizing by the pressurizing circuit module until the obvious pulse current signals exist on the oscilloscope if the obvious partial discharge signals do not exist on the oscilloscope; Step 4, after an obvious pulse current signal exists on the oscilloscope, connecting an ultrahigh frequency sensor with the oscilloscope, detecting a high-frequency electromagnetic wave signal generated by partial discharge by the ultrahigh frequency sensor, and outputting the high-frequency electromagnetic wave signal to the oscilloscope; the method comprises the steps of connecting an ultrasonic sensor with an oscilloscope, detecting an ultrasonic signal generated by partial discharge by the ultrasonic sensor, and outputting the ultrasonic signal to the oscilloscope, connecting a fluorescent optical fiber sensor with the oscilloscope, detecting an optical signal generated by partial discharge by the fluorescent optical fiber sensor, and outputting the optical signal to the oscilloscope; Step 5, after the partial discharge experiment is completed, the gas collecting device collects gas in the GIS test cavity after the discharge experiment, the gas collecting bag transmits the collected gas after the partial discharge experiment to the gas chromatograph, and the gas chromatograph detects the composition components and the concentration of the decomposed gas to obtain the information of insulation faults in the GIS; The specific mode of the gas chromatograph for acquiring the GIS internal insulation fault information is that the gas chromatograph detects the composition components and the concentration of the decomposed gas, and the partial discharge state is judged by judging the composition components and the concentration of SF6 gas after partial discharge; And 5, the gas collecting device in the step transmits the gas to a gas collecting bag through a hose, the gas collecting bag transmits the collected gas after the partial discharge test to a gas chromatograph, and the gas collecting device also comprises a valve which is used for slowly pumping the gas collecting device.
2. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized in that: The pressurizing circuit module comprises a coupling capacitor C1, a voltage dividing capacitor C2 and a voltage dividing capacitor C3, wherein the coupling capacitor C1 and the detection impedance are used for outputting pulse current signals, and the voltage dividing capacitors C2 and C3 are used for outputting power frequency periodic signals.
3. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized by comprising the following steps of: The high-voltage end in the pressurizing circuit module is connected with the GIS sleeve high-voltage end, one end of the coupling capacitor C1 is connected with the GIS sleeve high-voltage end, the other end of the coupling capacitor C1 is connected with one end of the detection impedance, the other end of the coupling capacitor C1 outputs a pulse current signal to the oscilloscope, the other end of the detection impedance is connected with one end of the voltage dividing capacitor C3, the other end of the voltage dividing capacitor C3 is connected with one end of the voltage dividing capacitor C2, the other end of the voltage dividing capacitor C3 outputs a power frequency periodic signal to the oscilloscope, and the other end of the voltage dividing capacitor C2 is connected with the GIS sleeve high-voltage end.
4. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized in that: The ultra-high frequency sensor is placed in front of the organic glass flange plate, the ultrasonic sensor is attached to the upper portion of the GIS shell, the fluorescent optical fiber sensor is placed on the outer surface of the organic glass flange plate, and the fluorescent optical fiber sensor is covered by opaque cloth.
5. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized in that: the test defect model comprises a metal guide rod, a high-voltage electrode and a ground electrode, wherein the metal guide rod is used for simulating test defects, one end of the metal guide rod is connected with the high-voltage end of the basin-type insulator, the other end of the metal guide rod is connected with the high-voltage electrode, and the ground electrode is connected to the ground wire through a metal flange plate; the test defect model comprises a corona discharge test defect model, an air gap discharge test defect model, a suspension electrode discharge test defect model, a creeping discharge test defect model and a free metal particle discharge test defect model.
6. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized in that: the gas collecting device is used for conveying the gas to the gas collecting bag through the hose, the gas collecting bag is used for conveying the collected gas after the partial discharge test to the gas chromatograph, and the gas collecting device further comprises a valve used for slowly opening the gas collecting device.
7. The GIS partial discharge laboratory effective simulation and multi-source detection system-based effective simulation and multi-source detection method is characterized in that: The specific mode of the gas chromatograph for acquiring the GIS internal insulation fault information is that the gas chromatograph detects and decomposes the composition components and the concentration of the gas, and the partial discharge state is judged by judging the composition components and the concentration of SF6 gas after partial discharge and decomposing characteristic gas.

Description

GIS partial discharge laboratory effective simulation and multisource detection system and method Technical Field The invention relates to the technical field of detection of an insulating state of electric power equipment, in particular to a real GIS discharge laboratory effective simulation and optical, electric, acoustic, magnetic and chemical multisource detection system and method. Background The construction of the extra-high voltage power grid can solve the contradiction of energy configuration, power coordination and land resource caused by power development and reduce the energy and environmental pressure caused by national economy development. The equipment is very important for the smooth development of the ultra-high voltage power grid. GIS (Gas Insulated Switchgear, GIS for short) belongs to an important power distribution device in an extra-high voltage power grid due to small occupied area and good technical characteristics. However, during the manufacturing, installation, debugging and operation of the GIS device, insulation defects such as high-voltage conductor metal spikes, metal protrusions on the inner surface of the housing, particles attached to the surface of the insulator, etc., are unavoidable, and may cause local electric field distortion inside the GIS, thereby inducing discharge accidents. The GIS partial discharge detection method commonly used at present comprises an ultrasonic method, an ultrahigh frequency method, an optical detection method and a characteristic gas detection method. The ultrasonic method is an ultrasonic signal for detecting partial discharge radiation, the ultrahigh frequency method is a high-frequency electromagnetic wave signal for detecting partial discharge radiation, the optical detection method is an optical signal for detecting partial discharge, and the characteristic gas detection method is a method for detecting trace characteristic gas generated by decomposition of insulating gas such as SF6 and the like caused by partial discharge. Meanwhile, the intensity of partial discharge, namely the discharge quantity pC, is calibrated by a pulse current method. The research of utilizing light, electricity, sound, magnetism, chemistry and the like to detect and develop GIS partial discharge characteristics in a laboratory is the basis for effectively acquiring GIS internal discharge characteristics, and particularly if the research of effectively simulating partial discharge tests and multisource detection of discharge characteristics can be carried out in a true GIS (GIS with the same size and structure as an on-site GIS). However, partial discharge itself has a certain destructive property, each test can lead to the fact that the same test can not be carried out at the same position in the real GIS cavity, so that the area where the real GIS can carry out the partial discharge test is smaller and smaller, and finally, the whole real GIS can not carry out the research of the partial discharge test. The true GIS is high in price, for example, the selling price of the 220kV GIS reaches millions of yuan, the burden is heavy for most university laboratories, and if the partial discharge simulation research can be repeatedly carried out on the true GIS under the condition of not damaging the true GIS, the burden of the university laboratories can be greatly reduced. In addition, the real GIS is of a totally-enclosed metal structure, and the positions of an antenna sensor in an ultrahigh frequency method and an optical fiber sensor in an optical detection method and paths for acquiring SF6 gas in a chemical detection method are not installed, so that research on optical, electrical, acoustic, magnetic and chemical multi-source detection methods cannot be carried out on the real GIS in a laboratory under the conditions of not damaging the real GIS structure and damaging the balanced distribution of an electric field in the GIS. Disclosure of Invention The invention aims to provide an effective simulation and multisource detection system and method for a GIS partial discharge laboratory, which can effectively realize the effective simulation of the discharge defects and the effective detection of optical, electric, acoustic, magnetic and chemical decomposition components of the simulated discharge defects of a real GIS under the condition of not damaging the structure of the real GIS, and provide a new solution for the effective simulation of the discharge defects of the real GIS and the effective research of multisource discharge characteristics in the laboratory. The invention provides a GIS partial discharge laboratory effective simulation and multisource detection system, which comprises a pressurization circuit module, a detection impedance, an ultrahigh frequency sensor, an ultrasonic sensor, a fluorescent optical fiber sensor, a test defect model, an oscilloscope, a gas collecting device and a gas chromatograph, wherein the pressurization circuit module i