CN105606872B - A kind of measurement method of GIS internal high frequencies transient current - Google Patents
A kind of measurement method of GIS internal high frequencies transient current Download PDFInfo
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- CN105606872B CN105606872B CN201610013108.3A CN201610013108A CN105606872B CN 105606872 B CN105606872 B CN 105606872B CN 201610013108 A CN201610013108 A CN 201610013108A CN 105606872 B CN105606872 B CN 105606872B
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Abstract
The present invention discloses a kind of measurement method of GIS internal high frequencies transient current, including：1) B dot coils are prepared；2) B dot coils are mounted on to a blind flange centre of GIS；3) mounted B dot coils are demarcated；4) when flowing through transient current in the Primary Conductor inside GIS, the output voltage of B dot coils is integrated, the transient current in Primary Conductor is obtained.The present invention can study the Transient Electromagnetic Phenomena inside GIS device, and then pass through code test, the performance of GIS device is evaluated, the research to transient state electromagnetic environment in substation is in addition can also be applied to, improves precision and the accuracy of above-mentioned technology application.
Description
Technical field
The invention belongs to High-Voltage Measurement Technology research fields, are related to a kind of measurement method of GIS internal high frequencies transient current.
Background technology
Gas insulated transformer substation (Gas Insulated Substation) is because its factor affected by environment is small, occupied space
Small, the advantages that operational reliability is high, seldom repair, has obtained increasingly extensive application in nearly two, 30 years.With operation electricity
The raising of pressure and air pressure in GIS, fast transient process will because of caused by the operation of disconnecting switch, earthing switch and breaker
It is more obvious and serious, and several harmful effects may be caused to system, when especially disconnecting switch suits unloaded busbar, because of it
The probability and frequency of operation are bigger, and the operation cycle is long, cause overvoltage phenomenon and electromagnetic compatibility problem inevitable, more
More to cause the concern of common people.
The Transient Electromagnetic Phenomena caused by switching manipulation is mainly shown as in GIS：Fast transient mistake on GIS bus casings
Transient state ground potential on voltage (VFTO), GIS shells increases (TEV), and due to generating high frequency very fast transient electricity inside GIS
It flows (VFTC), and transient electromagnetic field (TEM) and electromagnetic interference (EMI) is generated 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, a kind of electro-magnetic transient for endangering most serious it is existing
As.In operation, since its switch speed is slow, contact gap can occur repeatedly to restrike disconnecting switch, generate extremely steep row
Wave simultaneously in GIS pipelines rapidly occur refraction, reflection and superposition, generate the higher-order of oscillation fast transient overvoltage i.e. 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 have certain correlation, while VFTO generates transient overvoltage just
Transient state overcurrent is will produce, shows that VFTO has the characteristics that according to experiment：
1) wavefront is very steep, and the rise time is short (3~20ns), and voltage build-up rate is high, up to 40MV/s；
2) frequency is high, is concentrated mainly within the scope 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 shell, jeopardizes GIS internal units, is especially insulated to benzvalene form
The insulation harm of son is very big.When the VFTO in GIS is propagated in a manner of traveling wave along busbar, the skin effect of high-frequency current makes electricity
Stream is flowed along the inner surface of the outer surface of busbar and shell, and after reaching casing, a part is propagated along overhead line, to being attached thereto
Electrical equipment (such as transformer, overhead transmission line) cause direct insulation damages；Another part is then coupled between shell and ground,
Make to form the raising of transient state ground potential on GIS shells, i.e. TGPR, amplitude range is generally between 0.1~0.25p.u..It is tens of to upper
Hundred kilovolts of TGPR has the characteristics that the duration is short, frequency is high and steepness is big, and constituting overvoltage to secondary device threatens.
Currently, the research to VFTO characteristics both at home and abroad, it can be seen that the research of VFTO and VFTC characteristics be 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
More difficult in high potential current measurement and external larger to current interference, 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 noisy
Speed is studied more difficult to generating the influence of VFTO and VFTC in the case where speed conditions are closed in a variety of different isolation.For keeping apart
Influence of the divide-shut brake speed to VFTO is closed, disconnecting switch movement velocity is slower, and the number of repeated breakdown is then more when separating brake, that
Residual charge on unloaded busbar will be fewer, and the amplitude for closing noisy VFTO generated in the process next time is also lower, and
Do not provide experimental data.Coincidence is made a noise, and number is more, and residual charge can be fewer, not the explanation of theoretical side.
(3) not accurate enough to the research of disconnecting switch hf electric arc characteristic, the determination of the roads first breakdown Zhong Hu resistance is lacked
Weary foundation not can determine that arc road resistance is the resistance value in circuit or the arc resistance value of an arcing.
Due to voltage can in GIS external testings, at present for the measurement method of GIS transient overvoltages VFTO compared with
It is more.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 electric current high frequency section upper frequency limit reaches
100MHz, low frequency part is in hundreds of kHz.The basic skills for measuring high frequency transient current is measured using Rogowski coil.It measures
The Rogowski coil of higher frequency current response, volume size is all smaller, so the conductor for measuring electric current cannot be too big, additionally, there may be
Measure Insulation Problems.Therefore electric current is measured with Rogowski coil, need to solves and measure conductor size cooperation, measures Insulation Problems.Root
It is analyzed according to Primary Study, using Rogowski coil measurement electric current, its complicated difficulty is larger, and it is also big to solve cost.
Therefore, it is at present an industry problems to the measurement of the inside GIS VFTC, is badly in need of a kind of simple in structure, test safety,
And measurement method with high accuracy, the Transient Electromagnetic Phenomena of GIS is studied.
Invention content
The purpose of the present invention is to provide a kind of measurement methods of GIS internal high frequencies transient current, to solve above-mentioned technology
Problem.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of measurement method of GIS internal high frequencies transient current, includes the following steps：
1) B-dot coils are prepared；
2) B-dot coils are mounted on to a blind flange centre of GIS；
3) mounted B-dot coils are demarcated；
4) when flowing through transient current in the Primary Conductor inside GIS, the output voltage of B-dot coils is integrated, is obtained
To the transient current in Primary Conductor.
Further, B-dot coils bend to be formed using rigid metal full-shield cable；The B-dot coils include not closing
The ring part of conjunction, and the extension that extends from ring part；B-dot coils include three layers：The copper shield shell of outside, inside
Copper conductor and the insulator between copper conductor and copper shield shell；Extension tail portion is connected with BNC connector.
Further, the blind flange junction of B-dot coils and GIS seal and fix.
Further, mounted B-dot coils are demarcated in step 3), for obtain B-dot coils with it is primary
Mutual inductance M between conductor.
Further, the annular facial planes of B-dot coils is parallel with the Primary Conductor in GIS.
Further, the line footpath of copper conductor is 2mm.
Further, a diameter of 10cm, 15cm, 20cm, 25cm or 30cm of the inc ring part of B-dot coils.
Further, step 3) specifically includes following steps：After B-dot coils install, it is arranged on GIS outer sleeves
The Rogowski coil of one standard；When Primary Conductor generates a transient current, the induced current amplitude of Rogowski coil is measured, with
And the induced voltage amplitude of B-dot coils, B-dot coils and one are just obtained by induced current amplitude divided by induced voltage amplitude
Mutual inductance M between partial conductor completes the field calibration of B-dot coils.
Compared with the existing technology, the invention has the advantages that：
The present invention can study the Transient Electromagnetic Phenomena inside GIS device, and then by code test, to GIS
The performance of equipment is evaluated, and the research to transient state electromagnetic environment in substation is in addition can also be applied to, and is improved above-mentioned technology and is answered
Precision and accuracy.It is 0~3000A that the method for the present invention, which is a kind of current measuring range, Measurement bandwidth be 200kHz~
100MHz (- 3db), the measurement method of the GIS internal high frequency transient currents of measurement error≤3%；Equipment needed for the present invention carries
Convenient, simple in structure, test safety, precision are high, and one kind is provided simply, efficiently for the measurement of GIS internal high frequency transient currents
Method.
Description of the drawings
Fig. 1 is the Transient Electromagnetic Phenomena schematic diagram in GIS；
Fig. 2 is typical case's VFTO waveform diagrams inside GIS；Wherein Fig. 2 (a) is waveform when disconnecting switch is closed a floodgate, Fig. 2
(b) be disconnecting switch separating brake when waveform；
Fig. 3 is typical case's VFTC waveform diagrams inside GIS；Wherein Fig. 3 (a) is transient current wave when disconnecting switch is closed a floodgate
Shape, transient current waveform when Fig. 3 (b) is disconnecting switch separating brake；
Fig. 4 is B-dot schematic diagrams；Wherein, D is conductor, and Q is single-turn circular coil；
Fig. 5 is the GIS schematic view of the mounting position of current sensor；
Fig. 6 is the schematic diagram of current sensor.
Specific implementation mode
It please refers to shown in fig. 4 to fig. 6, to solve the problems, such as to measure GIS transient currents, the present invention is surveyed using B-dot methods
Measure electric current.B-dot is also known as magnetic coupling ring, is used for the measurement of variation magnetic field, the variation that can be also established by measuring the electric current of variation
Magnetic field achievees the purpose that measure electric current indirectly, its main feature is that frequency response is good, small easy to use, GIS is carried out using B-dot
The principle of measurement of transient current is as shown in Figure 4.
Conductor D is H away from coil Q Edge Distances, and mutual inductance between conductor D and coil Q is M, when conductor has electric current to flow through, then
Have：
U=Mdi/dt (1)
Coil Q output voltages are integrated, you can obtain the electric current in conducting wire D.The voltage magnitude and line of single-turn circular coil output
Diameter, the coil for enclosing annulus are related with spatial position between the spacing of conductor and coil annulus and conductor, when these parameters are consolidated
Fixed constant, then mutual inductance M values are determined, then the output voltage of single-turn circular coil and the electric current of conductor are complete correspondences.Using B-
Dot measures electric current, its advantage is that simple in structure, measurement frequency response range is wide, and implementation cost is low；The disadvantage is that needing in B-
Dot coils carry out field calibration after installing.
Developing B-dot coils need to be from insulation, output voltage amplitude, the airtight and coaxial transmission structure etc. between Primary Conductor
Aspect development and design.According to GIS structure sizes, B-dot coils can be mounted on the larger flange end cap centers GIS, flange end cap
Position (TCT interface SX in figure) and current sensor probe 1 are as shown in Figure 5.
In the present invention, B-dot coils are bent using rigid metal full-shield cable, by calculate can process multiple 10cm,
The B-dot coils of the different-diameters such as 15cm, 20cm, 25cm, 30cm, as shown in fig. 6, to mark timing adjustment at the scene, wherein
2 line footpath of copper conductor is 2mm, and annular copper conductor is not closed, and copper shield shell 3 with BNC connector 4 by screwed connection, lead by annular copper
Line is connect with electrode in BNC connector 4.Filled polytetrafluoroethylene insulator between copper conductor 2 and copper shield shell 3.
B-dot coil planes want fixed with cover board relative position, avoid making B-dot coil positions become because of vibration
Change and changes conversion coefficient.Sealing is with coaxial transmission system as GIS voltage probe structures.B-dot coils are being installed to GIS mistakes
Cheng Zhong should make B-dot coil planes parallel with the Primary Conductor of GIS.
A kind of measurement method of GIS internal high frequencies transient current of the present invention, includes the following steps：
1) it bends to form B-dot coils using rigid metal full-shield cable, which includes inc annular
Portion, and the extension that extends from ring part；B-dot coils include three layers：The copper of external copper shield shell 3, inside is led
Line 2 and the insulator between copper conductor 2 and copper shield shell 3；Extension tail portion is connected with BNC connector 4；
2) B-dot coils are mounted on to a blind flange centre of GIS；The blind flange junction of B-dot coils and GIS
It seals and fixes；BNC connector 4 is exposed to outside blind flange, for connecting data acquisition device；The annular facial planes of B-dot coils
It is parallel with the Primary Conductor in GIS；
3) mounted B-dot coils are demarcated：After B-dot coils install, the opposite position with Primary Conductor
Determination is set, but the proportionate relationship between the current value of Primary Conductor and the voltage of B-dot coils output needs to carry out live mark
It is fixed；Due to the limitation of the inner spaces GIS and Rogowski coil structure, Rogowski coil cannot be mounted on inside GIS；Field calibration
When after B-dot coils install, on GIS outer sleeves be arranged a standard Rogowski coil；One is generated in Primary Conductor
When a transient current, the induced current amplitude (A) of Rogowski coil and the induced voltage amplitude (mV) of B-dot coils are measured, is led to
It crosses induced current amplitude divided by induced voltage amplitude can obtain mutual inductance M (A/ between B-dot coils and Primary Conductor
mV)；
4) when flowing through transient current in the Primary Conductor inside GIS, the output voltage of B-dot coils is integrated, is obtained
To the transient current in Primary Conductor.
Claims (5)
1. a kind of measurement method of GIS internal high frequencies transient current, which is characterized in that include the following steps：
1) B-dot coils are prepared；
2) B-dot coils are mounted on to a blind flange centre of GIS；
3) mounted B-dot coils are demarcated；
4) when flowing through transient current in the Primary Conductor inside GIS, the output voltage of B-dot coils is integrated, obtains one
Transient current in partial conductor；
B-dot coils bend to be formed using rigid metal full-shield cable；The B-dot coils include inc ring part, with
And the extension extended from ring part；B-dot coils include three layers：External copper shield shell, internal copper conductor and
Insulator between copper conductor and copper shield shell；Extension tail portion is connected with BNC connector；
Step 3) specifically includes following steps：After B-dot coils install, sieve of a standard is set on GIS outer sleeves
Family name's coil；When Primary Conductor generates a transient current, the induced current amplitude and B-dot coils of Rogowski coil are measured
Induced voltage amplitude, just obtained between B-dot coils and Primary Conductor by induced current amplitude divided by induced voltage amplitude
Mutual inductance M, complete B-dot coils field calibration.
2. a kind of measurement method of GIS internal high frequencies transient current according to claim 1, which is characterized in that B-dot lines
The blind flange junction of circle and GIS seals and fixes.
3. a kind of measurement method of GIS internal high frequencies transient current according to claim 1, which is characterized in that B-dot lines
The annular facial planes of circle is parallel with the Primary Conductor in GIS.
4. a kind of measurement method of GIS internal high frequencies transient current according to claim 2, which is characterized in that copper conductor
Line footpath be 2mm.
5. a kind of measurement method of GIS internal high frequencies transient current according to claim 1, which is characterized in that B-dot lines
A diameter of 10cm, 15cm, 20cm, 25cm or 30cm of the inc ring part of circle.
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| CN201610013108.3A CN105606872B (en) | 2016-01-08 | 2016-01-08 | A kind of measurement method of GIS internal high frequencies transient current |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608389A (en) * | 2012-03-13 | 2012-07-25 | 华北电力大学 | Measurement method and measurement system for VFTC (very fast transient current) |
| CN103236684A (en) * | 2013-04-17 | 2013-08-07 | 清华大学 | High-frequency magnet ring device for restraining very fast transient overvoltage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064539A (en) * | 2006-09-06 | 2008-03-21 | Mitsubishi Electric Corp | Electronic ammeter |
-
2016
- 2016-01-08 CN CN201610013108.3A patent/CN105606872B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608389A (en) * | 2012-03-13 | 2012-07-25 | 华北电力大学 | Measurement method and measurement system for VFTC (very fast transient current) |
| CN103236684A (en) * | 2013-04-17 | 2013-08-07 | 清华大学 | High-frequency magnet ring device for restraining very fast transient overvoltage |
Non-Patent Citations (2)
| Title |
|---|
| 基于B-Dot的kA级短脉冲电流测量方法;谭榕容等;《太赫兹科学与电子信息学报》;20151231;第13卷(第6期);正文第0-3节 * |
| 磁绝缘传输线电流测量差模式B-dot探头;呼义翔等;《强激光与粒子束》;20121031;第24卷(第10期);正文第2节 * |
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Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID SHAANXI ELECTRIC POWER Research Institute Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee before: State Grid Corporation of China Patentee before: STATE GRID SHAANXI ELECTRIC POWER Research Institute |
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Effective date of registration: 20221221 Address after: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: STATE GRID SHAANXI ELECTRIC POWER Research Institute Patentee after: National Network (Xi'an) Environmental Protection Technology Center Co.,Ltd. Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Patentee before: STATE GRID CORPORATION OF CHINA Patentee before: STATE GRID SHAANXI ELECTRIC POWER Research Institute |