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 PDFInfo
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- 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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- signal
- surge voltage
- gis
- partial discharge
- oscillation mode
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- Testing Relating To Insulation (AREA)
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
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.
Priority Applications (1)
| 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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| 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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| CN106932697A true CN106932697A (en) | 2017-07-07 |
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| CN201710255131.8A Pending 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)
| 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 |
-
2017
- 2017-04-19 CN CN201710255131.8A patent/CN106932697A/en active Pending
Patent Citations (7)
| 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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