CN106932697A - GIS equipment partial discharge detection means under oscillation mode surge voltage - Google Patents

GIS equipment partial discharge detection means under oscillation mode surge voltage Download PDF

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Publication number
CN106932697A
CN106932697A CN201710255131.8A CN201710255131A CN106932697A CN 106932697 A CN106932697 A CN 106932697A CN 201710255131 A CN201710255131 A CN 201710255131A CN 106932697 A CN106932697 A CN 106932697A
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CN
China
Prior art keywords
signal
surge voltage
gis
partial discharge
oscillation mode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710255131.8A
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Chinese (zh)
Inventor
郝春艳
郭军科
贺欣
于香英
高宇
赵鹏
苏展
卢立秋
于金山
甘智勇
刘鸿芳
刘盛终
马伯杨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd
Original Assignee
TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd filed Critical TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd
Priority to CN201710255131.8A priority Critical patent/CN106932697A/en
Publication of CN106932697A publication Critical patent/CN106932697A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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 of components, parts or materials
    • G01R31/1254Testing 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 of components, parts or materials of gas-insulated power appliances or vacuum gaps

Abstract

The present invention relates to GIS equipment partial discharge detection means under a kind of oscillation mode surge voltage, including oscillatory surge voltage generator, the output of oscillatory surge voltage generator is applied in GIS device, simultaneously capacitive divider is connected between the output of oscillatory surge voltage generator and ground, the High Frequency Current Sensor for measuring GIS equipment partial discharge signal is installed in GIS device, the output of High Frequency Current Sensor is connected with signal conditioner, the output of signal conditioner is connected with high-speed collection card, high-speed collection card also receives electric discharge reference quantity signal simultaneously, high-speed collection card will receive signal and export after analog-to-digital conversion gives analysis main frame, local discharge signal is carried out feature extraction and pattern-recognition by analysis main frame, it is determined that the degree and type of electric discharge.The present invention can preferably detect the various defects in GIS inside, be that GIS puts into operation and provides practical safety guarantee.

Description

GIS equipment partial discharge detection means under oscillation mode surge voltage
Technical field
The present invention relates to the superfrequency Partial Discharge Detection of GIS under oscillation mode surge voltage.By High Frequency Current Sensor The local discharge signal of GIS under oscillation mode surge voltage is measured, carrying out denoising, feature extraction and pattern by software analysis knows Not, it is power system security fortune it is determined that the type and extent of the electric discharge of part, exclude the potential safety hazard that GIS device inside is present Row makes important leverage sheet.
Background technology
GIS (Gas Insulated Switchgear) equipment from 20th century since the sixties is practical, due to its structure Compact, floor space is small, reliability is high, flexible configuration, easy for installation, high safety, strong environmental adaptability the advantages of, at me It is used widely in state's power system high voltage power transmission and transforming system.GIS device is due in the design of product, Parts Purchasing, factory The factor of the too many levels such as processing, transport, in-site installation, inside may contain various defects.However as equipment voltage The continuous improvement of grade, equipment power frequency pressure test and partial discharge detection under voltage levels can not meet requirement detection Go out all defect.Research shows that ac voltage withstanding experiment and its partial discharge detection lack to the surface contamination of GIS inner insulators or air gap class Falling into has sensitivity higher, but collects for internal fields such as the metal spines and electrode surface cut on conductor or earth terminal In the not enough even failure of situation ability of discovery.And surge voltage can limit coronaization effect, the hair of electron avalanche can be promoted Exhibition, forms the bigger electric discharge of density, has greatly help to the detection of shelf depreciation, i.e., the discharge capacity under surge voltage is larger Partial discharge pulse be easier to be detected, while vibratory impulse voltage is for the pollution in the presence of inspection equipment and anomalous electric field knot Structure is especially effective.Therefore, the partial discharge experiment added in GIS device field test under oscillation mode surge voltage is capable of detecting when more More pressure-resistant and its partial discharge tests be can't detect internal flaw, to ensuring that equipment safety operation has important practical significance.
The content of the invention
The purpose of the present invention is directed to the deficiencies in the prior art, and proposes GIS device office under a kind of oscillation mode surge voltage Portion's discharging detection device.
The present invention solves its technical problem and takes following technical scheme to realize:
GIS equipment partial discharge detection means under a kind of oscillation mode surge voltage, including oscillatory surge voltage generator, shake The oscillatory surge voltage signal for swinging impulse voltage generator output is applied on the high voltage bus of GIS device, produces GIS device Shelf depreciation, meanwhile, connection is provided with the electricity of electric discharge reference quantity signal between the output of oscillatory surge voltage generator and ground Hold divider, the High Frequency Current Sensor for measuring GIS equipment partial discharge signal is installed on the grounding terminal of GIS device, it is high The output end of frequency current sensor is connected by transmission cable with the input of signal conditioner, the office that signal conditioner will be received Portion's discharge signal is filtered, and high-speed collection card is sent to after filtering low interference signal, high-speed collection card accepts filter simultaneously after Local discharge signal and electric discharge reference quantity signal, high-speed collection card will receive signal and export after analog-to-digital conversion to be led to analysis Local discharge signal is carried out feature extraction and pattern-recognition by machine, analysis main frame, it is determined that the degree and type of electric discharge.
And, oscillatory surge voltage generator is the generator that surge voltage is produced based on ball gap spark discharge principle, and Experiment oscillation mode is produced to impact wave voltage by wave regulating resistor and harmonic inductance.
And, the transmission cable between the High Frequency Current Sensor and signal conditioner carries out letter using double layer screen line Number transmission.
And, the signal conditioner detects partial discharge pulse signal by the way of broadband detection and high-pass filter, By the displacement current of high-pass filter filtering low.
And, the High Frequency Current Sensor and signal conditioner are placed in shield shell.
Advantages and positive effects of the present invention are:
Partial discharge detection of the present invention under before GIS puts into operation using oscillatory surge voltage is tested, by High Frequency Current Sensor Local discharge signal in detection GIS, is processed via signal conditioner, after capture card gathered data, is entered by shelf depreciation software Row analyzing and processing, can intuitively be displayed in the discharge signal occurred in the wave head of oscillatory surge voltage and wave rear, and pass through Discharge characteristic determines electric discharge type.This detection method can effectively detect ac voltage withstanding and its partial discharge experiment detection sensitivity Low defect, the especially pollution to GIS inner electrode surfaces and anomalous electric field structure are sensitiveer.Match somebody with somebody with ac voltage withstanding experiment Close using can preferably detect the various defects in GIS inside, be that GIS puts into operation and provides practical safety guarantee.
Brief description of the drawings
Fig. 1 is system structure diagram of the invention.
Fig. 2 is system flow block diagram of the invention;
Fig. 3 is current sensor schematic diagram in the present invention, wherein, i (t) is partial discharge current signal, and e (t) is induced voltage Signal;
Specific embodiment
The embodiment of the present invention is further described below:It is emphasized that embodiment of the present invention is explanation Property, rather than limited, therefore the present invention is not limited to the embodiment described in specific embodiment, every by this area The other embodiment that technical staff's technology according to the present invention scheme draws, also belongs to the scope of protection of the invention.
GIS equipment partial discharge detection means under a kind of oscillation mode surge voltage, as shown in the figures 1 and 2, including oscillatory surge Voltage generator, the oscillatory surge voltage signal of oscillatory surge voltage generator output is applied on the high voltage bus of GIS device, Make to produce shelf depreciation on the internal cavity of GIS device or disc insulator, meanwhile, in the output of oscillatory surge voltage generator It is connected between ground as surge voltage signal extraction unit, the electric capacity point for providing local discharge signal reference quantity signal Depressor, installs High Frequency Current Sensor on the grounding terminal of GIS device, and High Frequency Current Sensor measures the part of GIS device Discharge signal, the output end of High Frequency Current Sensor is connected by transmission cable with the input of signal conditioner, by what is measured Local discharge signal sends signal conditioner to, and the output end of signal conditioner is connected with high-speed collection card, and signal conditioner will The local discharge signal of reception is filtered, and high-speed collection card is sent to after filtering low interference signal, and high-speed collection card connects simultaneously The reference quantity signal of the local discharge signal of filtered local discharge signal and the conveying of surge voltage signal extraction unit is received, it is high Fast capture card gathers local discharge signal, realizes analog-to-digital conversion, and the output end of high-speed collection card is connected with analysis main frame, analysis master Local discharge signal is carried out feature extraction and pattern-recognition by machine, it is determined that the degree and type of electric discharge.
In specific implementation of the invention, oscillatory surge voltage generator is to produce impact based on ball gap spark discharge principle The generator of voltage, and the effect generation experiment oscillation mode impact wave voltage for passing through wave regulating resistor and harmonic inductance.Vibration punching Hitting voltage generator specifically produces rising edge for 1.2 μ s, and half peak value is 48 μ s, and frequency of oscillation is 360kHz, and amplitude is up to 150kV Adjustable oscillatory surge voltage waveform.
In specific implementation of the invention, as shown in figure 3, the High Frequency Current Sensor specifically uses a nickel zinc magnet ring It is as the magnetic core of High Frequency Current Sensor.The internal-and external diameter of magnet ring is respectively 26mm, 45mm, a height of 15mm, and initial permeability is 10, the coiling number of turn is 22, a width of 1M-120M of sensor strip.
In specific implementation of the invention, the transmission cable between the High Frequency Current Sensor and signal conditioner is used Double layer screen line carries out signal transmission, to reduce the interference of ambient signal.
In specific implementation of the invention, because surge voltage will bring displacement current problem, the frequency of surge voltage in itself Spectrum is wider, and frequency ranges up to hundreds of kHz, and its displacement current for producing has a strong impact on the signal to noise ratio of partial discharge pulse, and partial discharge is believed Number measurement produce interference.Due to SF6Partial discharge pulse current frequency spectrum in gas-insulated is up to several GHz, therefore the signal is adjusted Reason device detects partial discharge pulse signal by the way of broadband detection and high-pass filter, by high-pass filter filtering low Displacement current, the local discharge signal of reserved high-frequency improves the signal to noise ratio of local discharge signal.
In specific implementation of the invention, in order to eliminate the interference between forceful electric power and light current, by high frequency electric sensing Device and signal conditioner are placed in shield shell.
In specific implementation of the invention, the high-speed collection card is 4 passage pci interface capture cards, and single channel highest is adopted Sample rate is 40M, and resolution ratio 14, entrance potential range is 5V, for gathering local discharge signal, realizes analog-to-digital conversion.
In specific implementation of the invention, local discharge signal is carried out the analysis main frame into feature extraction and pattern is known Not, it is determined that the degree and type of electric discharge, specifically refer to analyze the Analysis of Partial Discharge software in main frame, based on LabVIEW platform Exploitation, there is filtering and noise reduction, and Partial discharge signal contrasts phase analysis with shockwave signal, and Partial discharge signal type diagnostic is added to data Storehouse and historical data management function, information are directly perceived, easy to operate.

Claims (5)

1. GIS equipment partial discharge detection means under a kind of oscillation mode surge voltage, it is characterised in that:Including oscillatory surge voltage Generator, the oscillatory surge voltage signal of oscillatory surge voltage generator output is applied on the high voltage bus of GIS device, is made GIS device produces shelf depreciation, meanwhile, connection is provided with electric discharge reference between the output of oscillatory surge voltage generator and ground The capacitive divider of signal is measured, the high frequency electric for measuring GIS equipment partial discharge signal is installed on the grounding terminal of GIS device Sensor, the output end of High Frequency Current Sensor is connected by transmission cable with the input of signal conditioner, signal conditioner The local discharge signal of reception is filtered, high-speed collection card is sent to after filtering low interference signal, high-speed collection card is simultaneously Local discharge signal after accepting filter and electric discharge reference quantity signal, high-speed collection card will receive signal carry out it is defeated after analog-to-digital conversion Go out to give analysis main frame, local discharge signal is carried out feature extraction and pattern-recognition by analysis main frame, it is determined that the degree and class of electric discharge Type.
2. GIS equipment partial discharge detection means under oscillation mode surge voltage according to claim 1, it is characterised in that: Oscillatory surge voltage generator is the generator that surge voltage is produced based on ball gap spark discharge principle, and by wave regulating resistor and Harmonic inductance produces experiment oscillation mode to impact wave voltage.
3. GIS equipment partial discharge detection means under oscillation mode surge voltage according to claim 1, it is characterised in that: Transmission cable between the High Frequency Current Sensor and signal conditioner carries out signal transmission using double layer screen line.
4. GIS equipment partial discharge detection means under oscillation mode surge voltage according to claim 1, it is characterised in that: The signal conditioner detects partial discharge pulse signal by the way of broadband detection and high-pass filter, by high-pass filter The displacement current of filtering low.
5. GIS equipment partial discharge detection means under oscillation mode surge voltage according to claim 1, it is characterised in that: The High Frequency Current Sensor and signal conditioner are placed in shield shell.
CN201710255131.8A 2017-04-19 2017-04-19 GIS equipment partial discharge detection means under oscillation mode surge voltage Pending CN106932697A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201710255131.8A CN106932697A (en) 2017-04-19 2017-04-19 GIS equipment partial discharge detection means under oscillation mode surge voltage

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102081136A (en) * 2010-12-01 2011-06-01 西安交通大学 Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage
CN103308736A (en) * 2013-07-03 2013-09-18 国家电网公司 Small-size integrated steep pulse generating device
CN103323754A (en) * 2013-06-09 2013-09-25 辽宁省电力有限公司大连供电公司 Impulse withstand voltage testing device for GIS devices of transformer stations
CN103675623A (en) * 2013-12-07 2014-03-26 西安交通大学 Method and system for detecting partial discharging of GIS under impulse voltage
CN104375066A (en) * 2014-11-07 2015-02-25 国家电网公司 GIS partial discharge mode identification method under oscillation mode impulse voltage
CN104459497A (en) * 2014-12-18 2015-03-25 西安交通大学 Device for measuring and analyzing partial discharge under surge voltage
CN106249118A (en) * 2016-09-20 2016-12-21 国网天津市电力公司 Based on GIS device superfrequency partial discharge detecting system under surge voltage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102081136A (en) * 2010-12-01 2011-06-01 西安交通大学 Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage
CN103323754A (en) * 2013-06-09 2013-09-25 辽宁省电力有限公司大连供电公司 Impulse withstand voltage testing device for GIS devices of transformer stations
CN103308736A (en) * 2013-07-03 2013-09-18 国家电网公司 Small-size integrated steep pulse generating device
CN103675623A (en) * 2013-12-07 2014-03-26 西安交通大学 Method and system for detecting partial discharging of GIS under impulse voltage
CN104375066A (en) * 2014-11-07 2015-02-25 国家电网公司 GIS partial discharge mode identification method under oscillation mode impulse voltage
CN104459497A (en) * 2014-12-18 2015-03-25 西安交通大学 Device for measuring and analyzing partial discharge under surge voltage
CN106249118A (en) * 2016-09-20 2016-12-21 国网天津市电力公司 Based on GIS device superfrequency partial discharge detecting system under surge voltage

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Application publication date: 20170707

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