CN106645876A - Measurement system and measurement method for high-frequency transit voltage in GIS - Google Patents
Measurement system and measurement method for high-frequency transit voltage in GIS Download PDFInfo
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- CN106645876A CN106645876A CN201611249697.1A CN201611249697A CN106645876A CN 106645876 A CN106645876 A CN 106645876A CN 201611249697 A CN201611249697 A CN 201611249697A CN 106645876 A CN106645876 A CN 106645876A
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- hand hole
- gis
- hole cover
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a measurement system and a measurement method for high-frequency transit voltage in a GIS. The measurement system comprises the components of a hand hole cover board, a polytetrafluoroethylene insulating sleeve, a polytetrafluoroethylene insulating film and a middle pole plate. The polytetrafluoroethylene insulating film is arranged between the hand hole cover board and the middle pole plate for keeping insulation between the hand hole cover board and the middle pole plate. The middle pole plate has a panel structure. The middle pole plate is fixed to the inside surface of the hand hole cover plate through a plurality of screws. Insulating sleeves for insulating are arranged between the plurality of screws and the middle pole plate. A BNC probe output base is fixed on the outside surface of the hand hole cover board. The center of the middle pole plate is provided with a middle pole plate coaxial conductor. The electrode core of the BNC probe output base is electrically connected with the middle pole plate coaxial conductor. The measurement system and the measurement method have advantages of high convenience in mounting, simple structure, high testing safety and high precision.
Description
Technical field
The invention belongs to High-Voltage Measurement Technology research field, more particularly to a kind of measurement of GIS internal high frequencies transient voltage
System and method.
Background technology
Factor affected by environment is little because of its for gas insulated transformer substation (Gas Insulated Substation), take up room
Little, operational reliability is high, little maintenance the advantages of obtained increasingly extensive application in nearly two, 30 years.With operation electricity
The raising of air pressure in pressure and GIS, the fast transient process caused because of the operation of disconnecting switch, earthed switch and breaker will
Become apparent from and seriously, and some harmful effects may be caused to system, when especially disconnecting switch suits unloaded bus, because of it
The probability and frequency ratio of operation is larger, and the operation cycle is long, causes overvoltage phenomenon and electromagnetic compatibility problem inevitable, more
To get over the concern for causing common people.
The Transient Electromagnetic Phenomena caused by switching manipulation in GIS is mainly shown as：Fast transient mistake on GIS bus casings
Transient state ground potential on voltage (VFTO), GIS housings raises (TEV), and because GIS inside produces high frequency very fast transient electricity
Stream (VFTC), and transient electromagnetic field (TEM) and electromagnetic interference (EMI) are produced in GIS surrounding spaces, cause the nothing to secondary device
Interference, as shown in Figure 1.
Wherein, fast transient overvoltage VFTO and VFTC be most typically in GIS, harm most serious a kind of electro-magnetic transient show
As.In operation, because its switch speed is slow, contact gap repeatedly to restrike disconnecting switch can occur, produce extremely steep row
Ripple is simultaneously rapid in GIS pipelines to be there is refraction, reflection and is superimposed, the fast transient overvoltage for producing the higher-order of oscillation be VFTO and
VFTC.The waveform of typical VFTO and VFTC, as shown in Figures 2 and 3.
According to electromagnetic field principle, VFTC and VFTO has certain correlation, while VFTO generation transient overvoltages just
Transient state overcurrent can be produced, is shown according to experiment, VFTO has the characteristics that：
1) wavefront is very steep, the rise time short (3～20ns), and voltage build-up rate is high, up to 40MV/s；
2) frequency is high, is concentrated mainly in the range of 0.5～150MHz, reaches as high as 300MHz；
3) amplitude is not high, and representative value is 1.5～2.0p.u., reaches as high as 2.5p.u..
VFTO is mainly acted between GIS inner conductors and housing, jeopardizes GIS internal units, and especially benzvalene form is insulated
The insulation harm of son is very big.When the VFTO in GIS is propagated in traveling wave mode along bus, the skin effect of high frequency electric makes electricity
Flow and flowed along the outer surface of bus and the inner surface of shell, after reaching sleeve pipe, a part is propagated along trolley line, to being attached thereto
Electrical equipment (such as transformer, overhead transmission line) cause direct insulation damages；Another part is then coupled between housing and ground,
Make to form the rising of transient state ground potential on GIS housings, i.e. TGPR, amplitude range is typically between 0.1～0.25p.u..It is tens of to upper
The characteristics of hundred kilovolts of TGPR has short duration, high frequency and big steepness, constitutes overvoltage and threatens to secondary device.
At present, both at home and abroad to the research of VFTO characteristics, it can be seen that the research of VFTO and VFTC characteristics is primarily present as
Lower problem：
(1) the existing research to fast transient overvoltage is more, but less to fast transient overcurrent characteristic research, due to
Current measurement is more difficult in the case of high potential, and outside is larger to current interference, and shielding problem is relatively difficult to resolve certainly.
(2) the GIS disconnecting switch speed in actual motion is relatively low, and speed is single, it is difficult to which the division for changing disconnecting switch is made a noise
Speed, studies more difficult to producing the impact of VFTO and VFTC in the case where speed conditions are closed in various different isolation.For isolation is closed
Impact of the divide-shut brake speed to VFTO, disconnecting switch movement velocity is slower, and the number of times of repeated breakdown is then more when separating brake, then
Residual charge on unloaded bus will be fewer, and the amplitude that VFTO produced during making a noise is closed next time is also lower, not
Provide experimental data.Overlapping, noisy number of times is more, and residual charge can be fewer, the explanation without theoretical side.
(3) research to disconnecting switch hf electric arc characteristic is not accurate enough, and the determination to first breakdown Zhong Hu roads resistance lacks
Weary foundation, it is impossible to determine that arc road resistance is the arc resistance value of the resistance value in loop or an arcing.
Due to voltage can in GIS external testings, therefore at present the measuring method for GIS transient overvoltage VFTO compared with
It is many.GIS current probes are the sensors for measuring GIS inner conductor transient currents.During GIS disconnecting switch divisions,
Its transient current frequency characteristic is similar with fast transient overvoltage (VFTO) characteristic, and its electric current HFS upper frequency limit reaches
100MHz, its low frequency part is in hundreds of kHz.The basic skills of measurement high frequency transient current is measured using Luo-coil.Measurement
The Luo-coil of higher frequency current response, its volume size is all less, so the conductor of measurement electric current can not be too big, additionally, there may be
Measurement Insulation Problems.Therefore electric current is measured with Luo-coil, need to solves and measure conductor size and coordinate, measure Insulation Problems.Root
Analyze according to Primary Study, using Luo-coil measurement electric current, its complex structure difficulty is larger, solves cost also big.
Therefore, to the measurement of GIS inside VFTC it is at present an industry difficult problem, is badly in need of a kind of simple structure, test safety,
And the measuring system and method for high precision, the Transient Electromagnetic Phenomena of GIS is studied.
The content of the invention
It is an object of the invention to provide the measuring system and method for a kind of GIS internal high frequencies transient voltage, with solution
State technical problem.The inventive method is a kind of current measuring range for 50kV～500kV, Measurement bandwidth be 50Hz～100MHz (-
3db), measure error≤3%, the measuring method of the GIS internal high frequency transient currents of voltage measurement response time≤2ns is installed
The side for the very fast transient electric current VFTO measurements of GIS inside that convenient, simple structure is integrated with test safety, high precision
Method, the measurement for GIS internal high frequency transient voltages provides a kind of simple, efficient method.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of measuring system of GIS internal high frequencies transient voltage, including hand hole cover plate, teflon insulation set, poly- four
PVF insulation film and middle plate；A strata tetrafluoroethene insulation film is provided between hand hole cover plate and middle plate, is protected
Hold the insulation between hand hole cover plate and middle plate；Middle plate is slab construction；Middle plate is fixed on by some screws
The medial surface of hand hole cover plate, is provided with insulation sleeve insulation between some screws and middle plate；On the lateral surface of hand hole cover plate
Be fixed with BNC probe output seats, middle plate center is provided with middle plate coaxial conductor, the electrode cores of BNC probe output seats with
Middle plate coaxial conductor is electrically connected with.
Further, BNC probes output seat is threadedly secured on hand hole cover plate.
Further, also including voltage probe output end seal closure, voltage probe output end seal closure is fastened by steel
Screw is fixed on hand hole cover plate outer surface, and covers BNC probe output seats；Voltage probe output end seal closure and hand hole cover plate
Between by sealing ring seal.
Further, a kind of measuring system of GIS internal high frequencies transient voltage is installed in the hand hole of GIS device,
Middle plate is placed between GIS mesohighs conductor and hand hole cover plate, and electric capacity C1 is formed between high-pressure conductor and middle plate, middle
Electric capacity C2, C1 and C2 are formed between pole plate and hand hole cover plate and constitutes a capacitive divider.
A kind of measuring method of GIS internal high frequencies transient voltage, it is characterised in that based on a kind of GIS internal high frequencies transient state
The measuring system of voltage, comprises the following steps：
1) before a kind of measuring system of GIS internal high frequencies transient voltage is arranged in GIS device to be measured, to described one
Planting the measuring system of GIS internal high frequency transient voltages carries out Experimental Calibration, determines its intrinsic standoff ratio；
2) a kind of measuring system of GIS internal high frequencies transient voltage is arranged on into GIS device hand hole position to be measured, in
Between pole plate be placed between GIS mesohighs conductor and hand hole cover plate；
3) electric capacity C1 is formed between high-pressure conductor and middle plate, electric capacity C2 is formed between middle plate and hand hole cover plate,
C1 and C2 constitutes a capacitive divider；It is interim to remove voltage probe output end seal closure, measurement BNC probe outputs during measurement
Voltage between seat shell and electrode cores, i.e. voltage between middle plate and hand hole cover plate, according to step 1) determined point
Pressure ratio, by the voltage-to-ground for being calculated high-pressure conductor.
Relative to prior art, the present invention has following technique effect：The present invention is by the hand hole cover plate of GIS device
One piece of middle plate is set, and middle plate is placed between GIS mesohighs conductor and hand hole cover plate, high-pressure conductor and middle plate it
Between formed electric capacity C1, between middle plate and hand hole cover plate formed electric capacity C2, C1 and C2 composition one capacitive divider, work as partial pressure
After determination, the voltage at electric capacity C2 two ends is measured, by calculating the voltage-to-ground that high-pressure conductor is obtained.Installation side of the invention
Just, simple structure and test safety, high precision.
Current measuring range of the present invention be 50kV～500kV, Measurement bandwidth be 50Hz～100MHz (- 3db), measure error
≤ 3%, the voltage measurement response time≤2ns.The present invention is a kind of side for the very fast transient electric current VFTO measurements of GIS inside
Method, the measurement for GIS internal high frequency transient voltages provides a kind of simple, efficient method.
The present invention is studied the Transient Electromagnetic Phenomena inside GIS device, and then by code test, to GIS device
Performance evaluated, also apply be applicable to the research to transient state electromagnetic environment in transformer station in addition, improve above-mentioned technology application
Precision and the degree of accuracy.
Description of the drawings
Fig. 1 is the Transient Electromagnetic Phenomena schematic diagram in GIS；
Fig. 2 is GIS inside typical case's VFTO waveforms；Voltage waveform when wherein Fig. 2 (a) closes a floodgate for disconnecting switch；Fig. 2 (b) is
Waveform during disconnecting switch separating brake；
Fig. 3 is GIS inside typical case's VFTC waveforms；Transient current waveform when wherein Fig. 3 (a) closes a floodgate for disconnecting switch；Fig. 3
Transient current waveform when () is closed a floodgate for disconnecting switch b；
Fig. 4 is GIS voltage probe schematic diagrams；
Fig. 5 is GIS voltage probe structure charts.
In figure, 1, hand hole cover plate；2nd, voltage probe output end seal closure；3rd, teflon insulation set；4th, polytetrafluoroethyl-ne
Alkene insulation film；5th, middle plate；11st, steel fastening screw；12nd, sealing ring；13rd, BNC probes output seat；14th, middle plate
Coaxial conductor；15 insulation sleeves.
Specific embodiment
Refer to shown in Fig. 4, the present invention designs one and installs voltage probe in GIS hand holes cap locations.
Middle plate and hand hole cover plate are a pair of aluminum metal polar plates in Fig. 4.Hand hole cover plate is GIS tank body hand hole cover plates,
It is fixed by screw on GIS housings, current potential is ground potential, different size hand can be made according to different electric pressure GIS sizes
The supporting installation of blind patch.Middle plate is placed between GIS mesohighs conductor and hand hole cover plate, therefore, high-pressure conductor and dynode
Electric capacity C1 is formed between plate, electric capacity C2, C1 and C2 is formed between middle plate and hand hole cover plate and is constituted a capacitive divider, when
After intrinsic standoff ratio determines, the voltage at electric capacity C2 two ends is measured, by calculating the voltage-to-ground that high-pressure conductor is obtained.Actual measurement
It is stable state and the transient voltage amount of measuring simultaneously at short notice, with known steady state voltage Amplitude Ration to transient voltage amplitude, you can
Obtain voltage transient amount.
Refer to shown in Fig. 5, a kind of measuring system of GIS internal high frequencies transient voltage of the invention, including hand hole cover plate 1,
Voltage probe output end seal closure 2, teflon insulation set 3, teflon insulation film 4 and middle plate 5.
A strata tetrafluoroethene insulation film is provided between hand hole cover plate 1 and middle plate 5, holding hand hole cover plate 1 is with
Between insulation between pole plate 5.Middle plate 5 is slab construction；Probe output characteristics is high resistant, is connected with measuring instrument and preferably adopts
10:1 or 100:The measurement test pencil probe connection of 1 high value standard, test pencil probe input impedance is 10M Ω or 100M Ω.Probe output
Using coaxial transmission system, make probe that there is preferable transmission performance.To ensure the sealing property of probe, sonde configuration is using double
Coaxial sealant pouring and sealing and sealing ring 12 at 3 in sealing structure, i.e. Fig. 5, ensure to greatest extent the sealing property popped one's head in.Middle plate
By the insulation in Fig. 5 between fastening screw and middle plate between fixed screw and middle plate between 5 and hand hole cover plate 1
Set 15 is insulated.The BNC probe output shells of seat 13 are threadedly secured on hand hole cover plate 1, wherein electrode cores and dynode
Plate coaxial conductor 14 welds together.
Voltage probe output end seal closure 2 is fixed on the outer surface of hand hole cover plate 1 by steel fastening screw 11；Voltage is visited
Sealed by sealing ring 12 between head output end seal closure 2 and hand hole cover plate 1.The surrounding of middle plate 5 is solid by multiple screws
It is scheduled on the inner surface of hand hole cover plate 1, this etc. is provided with insulation sleeve 15 between fastening screw and middle plate, hand hole cover plate 1 is with
Between pole plate 5 have a strata tetrafluoroethene insulation film.The center of middle plate 5 is provided with middle plate coaxial conductor 14, hand hole cover
The center of plate 1 is provided with BNC probe output seats 13, and middle plate coaxial conductor 14 is connected with the electrode cores of BNC probe output seats 13.
According to different electric pressure GIS device hand hole positions and cover plate size, process and assemble voltage probe, the two probes
In addition to the size of the cover plate is variant, other parts are identical.Each ready-made probe in a pre-installation will be by its point of Experimental Calibration
Pressure ratio.
A kind of measuring method of GIS internal high frequencies transient voltage of the present invention, comprises the following steps：
1) before a kind of measuring system of GIS internal high frequencies transient voltage is arranged in GIS device to be measured, to described one
Planting the measuring system of GIS internal high frequency transient voltages carries out Experimental Calibration, determines its intrinsic standoff ratio；
2) a kind of measuring system of GIS internal high frequencies transient voltage is arranged on into GIS device hand hole position to be measured, in
Between pole plate be placed between GIS mesohighs conductor and hand hole cover plate；
3) electric capacity C1 is formed between high-pressure conductor and middle plate, electric capacity C2 is formed between middle plate and hand hole cover plate,
C1 and C2 constitutes a capacitive divider；It is interim to remove voltage probe output end seal closure 2, measurement BNC probe outputs during measurement
Voltage between 13 shells of seat and electrode cores, i.e. voltage between middle plate and hand hole cover plate, according to step 1) determined
Intrinsic standoff ratio, by the voltage-to-ground for being calculated high-pressure conductor.
Step 3) in actually measurement be stable state and the transient voltage amount of measuring simultaneously at short notice, with known steady state voltage width
Value compares transient voltage amplitude, you can obtain voltage transient amount.
Claims (5)
1. a kind of measuring system of GIS internal high frequencies transient voltage, it is characterised in that including hand hole cover plate (1), polytetrafluoroethylene (PTFE)
Insulation sleeve (3), teflon insulation film (4) and middle plate (5)；
Be provided with a strata tetrafluoroethene insulation film between hand hole cover plate and middle plate, keep hand hole cover plate and middle plate it
Between insulation；
Middle plate is slab construction；Middle plate is fixed on the medial surface of hand hole cover plate, some spiral shells by some screws
Insulation sleeve insulation is provided between nail and middle plate；
BNC probes output seat (13) is fixed with the lateral surface of hand hole cover plate, middle plate center is provided with the same spindle guide of middle plate
Body (14), the electrode cores of BNC probe output seats are electrically connected with middle plate coaxial conductor.
2. the measuring system of a kind of GIS internal high frequencies transient voltage according to claim 1, it is characterised in that BNC pops one's head in
Output seat (13) is threadedly secured on hand hole cover plate.
3. the measuring system of a kind of GIS internal high frequencies transient voltage according to claim 1, it is characterised in that also include
Voltage probe output end seal closure (2), voltage probe output end seal closure is fixed on outside hand hole cover plate by steel fastening screw
On surface, and cover BNC probes output seat (13)；It is close by sealing ring between voltage probe output end seal closure and hand hole cover plate
Envelope.
4. the measuring system of a kind of GIS internal high frequencies transient voltage according to claim 1, it is characterised in that described
The measuring system for planting GIS internal high frequency transient voltages is installed in the hand hole of GIS device, and middle plate is placed in GIS mesohighs and leads
Between body and hand hole cover plate, electric capacity C1 is formed between high-pressure conductor and middle plate, formed between middle plate and hand hole cover plate
Electric capacity C2, C1 and C2 constitute a capacitive divider.
5. a kind of measuring method of GIS internal high frequencies transient voltage, it is characterised in that based on any one of Claims 1-4 institute
A kind of measuring system of the GIS internal high frequencies transient voltage stated, comprises the following steps：
1) before a kind of measuring system of GIS internal high frequencies transient voltage is arranged in GIS device to be measured, to described one kind
The measuring system of GIS internal high frequency transient voltages carries out Experimental Calibration, determines its intrinsic standoff ratio；
2) a kind of measuring system of GIS internal high frequencies transient voltage is arranged on into GIS device hand hole position to be measured, dynode
Plate is placed between GIS mesohighs conductor and hand hole cover plate；
3) between high-pressure conductor and middle plate formed electric capacity C1, between middle plate and hand hole cover plate formed electric capacity C2, C1 with
C2 constitutes a capacitive divider；It is interim to remove voltage probe output end seal closure during measurement, outside measurement BNC probe output seats
Voltage between voltage between shell and electrode cores, i.e. middle plate and hand hole cover plate, according to step 1) intrinsic standoff ratio that determined,
By the voltage-to-ground for being calculated high-pressure conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249697.1A CN106645876A (en) | 2016-12-29 | 2016-12-29 | Measurement system and measurement method for high-frequency transit voltage in GIS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249697.1A CN106645876A (en) | 2016-12-29 | 2016-12-29 | Measurement system and measurement method for high-frequency transit voltage in GIS |
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| CN106645876A true CN106645876A (en) | 2017-05-10 |
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| CN201611249697.1A Pending CN106645876A (en) | 2016-12-29 | 2016-12-29 | Measurement system and measurement method for high-frequency transit voltage in GIS |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525958A (en) * | 2017-07-05 | 2017-12-29 | 中国电力科学研究院 | A kind of transient state device and method that induced voltage measures over the ground being used for power equipment |
| CN110501619A (en) * | 2019-08-30 | 2019-11-26 | 国网山西省电力公司电力科学研究院 | A kind of high frequency response partial pressure measuring apparatus |
| CN112730951A (en) * | 2020-12-29 | 2021-04-30 | 国网陕西省电力公司电力科学研究院 | Method for measuring TEV and TGPR in gas insulated substation |
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| CN203037716U (en) * | 2012-12-10 | 2013-07-03 | 青海电力科学试验研究院 | Transformer and reactor entrance VFTO high-frequency signal test device for GIS transformer station |
| CN103235166A (en) * | 2013-04-17 | 2013-08-07 | 清华大学 | Hand-hole type capacitive voltage divider |
| CN103630732A (en) * | 2013-11-19 | 2014-03-12 | 杭州休普电子技术有限公司 | Isolation passive high-voltage electrified indication device |
| CN104502751A (en) * | 2014-12-10 | 2015-04-08 | 国家电网公司 | Simulation circuit model for acquiring transient potential uplift of GIS (Gas-Insulator Switchgear) device shell |
| CN104833907A (en) * | 2015-05-27 | 2015-08-12 | 华北电力大学（保定） | System for testing GIS partial discharge and VFTO |
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| CN101782603A (en) * | 2010-03-08 | 2010-07-21 | 华北电力大学 | Flat-plate VFTO measuring sensor |
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| CN203037716U (en) * | 2012-12-10 | 2013-07-03 | 青海电力科学试验研究院 | Transformer and reactor entrance VFTO high-frequency signal test device for GIS transformer station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525958A (en) * | 2017-07-05 | 2017-12-29 | 中国电力科学研究院 | A kind of transient state device and method that induced voltage measures over the ground being used for power equipment |
| CN110501619A (en) * | 2019-08-30 | 2019-11-26 | 国网山西省电力公司电力科学研究院 | A kind of high frequency response partial pressure measuring apparatus |
| CN112730951A (en) * | 2020-12-29 | 2021-04-30 | 国网陕西省电力公司电力科学研究院 | Method for measuring TEV and TGPR in gas insulated substation |
| CN112730951B (en) * | 2020-12-29 | 2023-06-27 | 国网陕西省电力公司电力科学研究院 | Method for measuring TEV and TGPR in gas-insulated substation |
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Application publication date: 20170510 |