CN104678263B - A kind of industrial frequency experiment method suitable for equal potential shielded capacitor voltage transformer - Google Patents
A kind of industrial frequency experiment method suitable for equal potential shielded capacitor voltage transformer Download PDFInfo
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- CN104678263B CN104678263B CN201310611820.XA CN201310611820A CN104678263B CN 104678263 B CN104678263 B CN 104678263B CN 201310611820 A CN201310611820 A CN 201310611820A CN 104678263 B CN104678263 B CN 104678263B
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- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000010998 test method Methods 0.000 claims abstract description 14
- 239000012212 insulator Substances 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 8
- 239000012774 insulation material Substances 0.000 claims description 4
- 230000008961 swelling Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 11
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- 238000004146 energy storage Methods 0.000 description 2
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Abstract
The present invention relates to a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer, the method is suitable for the gap between the internal layer main capacitor and outer layer auxiliary capacitor of the equal potential shielded capacitor voltage transformer；Method includes the following steps: test voltage is applied between the two end electrodes and ground of the auxiliary capacitor, the main capacitor two end electrodes are grounded；The test voltage is increased to test voltage value from lower voltage, is kept for 5 minutes, is dropping to lower voltage.This method can verify the radial insulation intensity between the internal layer main capacitor and outer shield auxiliary capacitor of the every section equivalent potential screen capacitor unit of extra-high-voltage equal potential shielded capacitor voltage transformer, it is ensured that it is able to bear ectonexine overvoltage without puncturing.
Description
Technical field:
The present invention relates to a kind of industrial frequency experiment methods, are more particularly to a kind of for equal potential shielded capacitor voltage mutual inductance
Gap industrial frequency withstand voltage test method between main capacitor and auxiliary capacitor in device.
Background technique:
AC extra high voltage technology of transmission of electricity in China's is quickly grown in recent years, this just proposes the accurate measurement of extra-high voltage grid voltage
High request is gone out.High voltage meter mainly has following three kinds at present: electromagnetic potential transformer, capacitance type potential transformer
And electronic type voltage transformer.Electromagnetic potential transformer is chiefly used in the voltage measurement of 110kV or less voltage class, capacitive battery
Pressure mutual inductor is commonly used to the voltage measurement of 110kV above.Electronic type voltage transformer is still within research and development at present
And experimental stage, the problems such as voltage measurement accuracy, laser life-span, system reliability, need to further be researched and solved, at present still
Engineer application is not put into.
For the voltage class of 500kV or more, especially for extra-high voltage grade (1000kV), electromagnetic potential transformer by
It in insulation difficulty and is easy that ferromagnetic resonance occurs in primary side and then causes electric power accident, do not use.Capacitor voltage is mutual
Sensor because its structure is simple, with power grid ferromagnetic resonance, high reliability will not occur for low cost, primary side, by
It is widely used in the measurement of ultra-high/extra-high voltage voltage class network voltage.
But for the capacitance type potential transformer for being applied to ultra-high/extra-high voltage field, there are following technical difficulties:
(1) influence of the stray capacitance to capacitance type potential transformer accuracy of measurement over the ground
Northwest China power grid 750kV capacitance type potential transformer actual measured results show caused by stray capacitance over the ground
Measurement error may be up to 0.2% or more.Stray capacitance is reduced to accuracy by using the method for increasing capacitance in the industry at present
The influence of measurement.But for extra-high voltage grade (1000kV or more), stray capacitive currents are significantly increased, up to 20mA.
Capacitance type potential transformer at this time, even if capacitance increases to 10000pf, class of accuracy is also unable to reach 0.1 grade of standard.
(2) field-checking is difficult
After usual capacitance type potential transformer is installed at the scene, need to carry out field-checking so as to timely contrast differences and angular difference
It is modified.But in ultra-high voltage transformer station, since the factors such as substation's place situation, the serious electromagnetic interference in scene exist,
So it is extremely difficult to carry out field-checking to extra-high voltage capacitor voltage transformer.
(3) transient state individual features problem
The extensive use of digital relay protection system proposes higher and higher want to the response characteristic of voltage transformer
It asks, it is desirable that transformer secondary voltage should quick and precisely reflect the variation of primary voltage.Related regulatory requirements, transformer primary is over the ground
After short circuit, secondary voltage should be down to 0.1 times of initial value or less within 0.2 second.Existing CVT is all made of energy-storage travelling wave tube composition
Ferromagnetic resonance damper, to inhibit issuable ferromagnetic resonance in electromagnetic unit.The introducing of energy-storage travelling wave tube makes the sound of mutual inductor
Characteristic is answered to be deteriorated, it is difficult to meet the requirement that extra-high voltage grid relay protection quick and precisely acts.
And in capacitance type potential transformer, measurement partial pressure main capacitor and annular electrode and shielding auxiliary capacitor
Between be not allow for any electrical connection, i.e., for integral capacitor divider, by several sections measure partial pressure main capacitor
An electric loop in series is independent from each other with each shielding with auxiliary capacitor group shield loop in series.With
Gas insulating material, insulating oil or other interior insulation material holding capacitor device unit internal measurements met the requirements divide main electricity
Radial good insulation between container and annular electrode and shielding auxiliary capacitor.
Switching impulse transient operating mode when exchanging steady state condition and switching overvoltage wave via line is transmitted to substation
Under, guarantee reliable electric insulation between measurement partial pressure main capacitor and shielding auxiliary capacitor, so that it is guaranteed that novel spy
The normal operation of high pressure equal potential shielded capacitor voltage transformer is vital.
Summary of the invention:
The object of the present invention is to provide a kind of industrial frequency experiment method suitable for equal potential shielded capacitor voltage transformer,
The main electricity of internal layer of this method verifying every section equivalent potential screen capacitor unit of extra-high-voltage equal potential shielded capacitor voltage transformer
Radial insulation intensity between container and outer shield auxiliary capacitor, it is ensured that its be able to bear ectonexine overvoltage without
Breakdown.
To achieve the above object, the invention adopts the following technical scheme: a kind of equal potential shielded capacitor voltage transformer
Industrial frequency withstand voltage test method, the method be suitable for the equal potential shielded capacitor voltage transformer internal layer main capacitor
With the gap between outer layer auxiliary capacitor；Method includes the following steps:
(1) test voltage is applied between the two end electrodes and ground of the auxiliary capacitor, the main capacitor both ends
Electrode is grounded；
(2) test voltage is increased to test voltage value from initial voltage value, is kept for 5 minutes, is dropping to lower electricity
Pressure.
A kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer provided by the invention, the step
(1) for test voltage to be applied between the two end electrodes and ground of the main capacitor, the two end electrodes of the auxiliary capacitor
It is grounded.
A kind of industrial frequency withstand voltage test method of potential screen capacitance type potential transformer provided by the invention, the method exist
It is carried out in single-unit equivalent potential screen capacitor；
The initial voltage value and test voltage value of the step (2) are according to the single-unit equivalent potential screen capacitor
Electric parameter selects corresponding test voltage value with test requirements document.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, the single-unit equivalent potential screen capacitor include pivot flange, be arranged in it is between the upper and lower pivot flange, from inside to outside according to
The secondary main capacitor being coaxially provided with, interior insulation material, annular electrode and insulating sleeve；The top and bottom end of the insulating sleeve point
The sleeve flange that She You not be connected with the pivot flange, in annular electrode upper and lower side institute corresponding with its upper and lower side
It states and is equipped with auxiliary capacitor between pivot flange.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, the main capacitor are respectively equipped with the supporting insulator connecting with the pivot flange up and down, and the supporting insulator is located at
On the axle center of the insulating sleeve.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, guide flange is respectively equipped at the top and bottom of the main capacitor, and the inner headed face of the guide flange is arranged in the branch
Outside the periphery for supportting insulator bottom end.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, is arranged between the inner headed face of the guide flange at the top of the main capacitor and the supporting insulator periphery that there are one
Fixed down suction, the size in the gap is by the guide flange, the relative mounting location of the supporting insulator and institute
Main capacitor maximum swelling amount is stated to determine.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, is equipped with the valve rubber matched at the top of the supporting insulator, and the gap is greater than the rubber mat thickness；
The guide flange inner headed face of the main capacitor end and the supporting insulator bottom end that is inserted
Periphery is connected radially by valve rubber.
Another preferred a kind of industrial frequency withstand voltage test method of potential screen capacitance type potential transformer provided by the invention,
The guide flange being arranged at the top of the main capacitor is exhausted by its side inner headed face and the support corresponding thereto
The top side periphery of edge is flexibly connected；
The guide flange and the supports insulative subactivity corresponding thereto of the main capacitor bottom end are set
Connection.
Another preferred a kind of industrial frequency withstand voltage test side of equal potential shielded capacitor voltage transformer provided by the invention
Method, the auxiliary capacitor are connect by stud and nut with the annular electrode, and the stud passes through the auxiliary capacitor
Extend to its corresponding described pivot flange；
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, the present invention detection every section equivalent potential screen capacitor unit of extra-high-voltage equal potential shielded capacitor voltage transformer
Internal layer main capacitor and outer shield auxiliary capacitor between radial insulation intensity, it is ensured that it is able to bear ectonexine mistake
Voltage is without puncturing；
2, the test method in the present invention effectively avoids the generation of resonance in test loop；
3, test method of the invention is simple, convenient in operation.
Detailed description of the invention
Fig. 1 is test schematic of the invention；
Fig. 2 is test schematic of the invention；
Fig. 3 is the equivalent potential screen capacitor axial section in the present invention；
Wherein, 1- main capacitor, 2- insulating sleeve, 3- auxiliary capacitor, 4- annular electrode, 5- supporting insulator, 6- branch
Staying is blue；7- sleeve flange, 8- valve rubber, the gap 9-, 10- guide flange.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in Figure 1-3, the industrial frequency withstand voltage test method of the invention equal potential shielded capacitor voltage transformer of this example is suitable
For the gap between the main capacitor and auxiliary capacitor of the equal potential shielded capacitor voltage transformer；This method include with
Lower step:
(1) test voltage is applied to the auxiliary capacitor C2Two end electrodes and ground between, the main capacitor C1Two
Termination electrode is grounded；
(2) test voltage is persistently increased to test voltage value from lower voltage initial value, is kept for 5 minutes, is continuing
Lower voltage is dropped to, then is cut off the power.
The lower voltage initial value and test voltage value in the step (2) is according to the single-unit equivalent potential screen electricity
The electric parameter of container selects corresponding test voltage value with test requirements document.
The step (1) is that test voltage is applied to the main capacitor C1Two end electrodes and ground between, it is described auxiliary
Help capacitor C2Two end electrodes be grounded.The method carries out in single-unit equivalent potential screen capacitor.
The single-unit equivalent potential screen capacitor include pivot flange 6, be arranged in it is between the upper and lower pivot flange 6, by
It is interior to the main capacitor 1, interior insulation material, annular electrode 4 and the insulating sleeve 2 that are sequentially coaxially equipped with outside；The insulating sleeve 2
Top and bottom end are respectively equipped with the sleeve flange 2 being connected with the pivot flange 6,4 upper and lower side of annular electrode with and its
Auxiliary capacitor 3 is equipped between the corresponding pivot flange 6 of upper and lower side.
About 1 main capacitor is respectively equipped with the supporting insulator 5 connecting with the pivot flange 6, and the support is exhausted
Edge 5 is located on the axle center of the insulating sleeve 2.
The top and bottom of the main capacitor 1 are respectively equipped with guide flange 10, and the inner headed face of the guide flange 10 is set
It sets outside the periphery of 5 bottom end of supporting insulator.
Be arranged in the guide flange 10 at 1 top of the main capacitor inner headed face and 5 outer circle of supporting insulator
There are certain down suction 9 between face, the size in the gap 9 by the guide flange 10, the supporting insulator 5 it is opposite
Installation site and 1 maximum swelling amount of the main capacitor determine.
The valve rubber 8 matched is equipped at the top of the supporting insulator 5, it is thick that the gap 9 is greater than the valve rubber 8
Degree；
10 inner headed face of the guide flange of the main capacitor end and 5 bottom end of the supporting insulator being inserted
Periphery connected radially by valve rubber 8.
Be arranged in the guide flange 10 at 1 top of the main capacitor by its side inner headed face with corresponding thereto
The top side periphery of the supporting insulator 5 is flexibly connected；The guide flange of 1 bottom end of main capacitor is set
10 are flexibly connected with the supporting insulator 5 corresponding thereto.
The auxiliary capacitor 3 is connect by stud and nut with the annular electrode 4, and the stud passes through the auxiliary
Capacitor 3 extends to its corresponding described pivot flange 6；
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (5)
1. a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer, the method is suitable for described equal electricity
Gap between the internal layer main capacitor and outer layer auxiliary capacitor of bit mask capacitance type potential transformer；It is characterized by: the party
Method the following steps are included:
(1) test voltage is applied between the two end electrodes and ground of the auxiliary capacitor, the main capacitor two end electrodes
It is grounded；
(2) test voltage is increased to test voltage value from initial voltage value, is kept for 5 minutes, is dropping to lower voltage；
The method carries out on single-unit equivalent potential screen capacitor unit；
The initial voltage value and test voltage value of the step (2) are according to the electric parameter of the single-unit equivalent potential screen capacitor
Corresponding test voltage value is selected with test requirements document；
The single-unit equivalent potential screen capacitor include pivot flange, be arranged in it is between the upper and lower pivot flange, from inside to outside
Main capacitor, interior insulation material, annular electrode and the insulating sleeve being sequentially coaxially equipped with；The top and bottom end of the insulating sleeve
It is respectively equipped with the sleeve flange being connected with the pivot flange, it is corresponding with its upper and lower side in the annular electrode upper and lower side
Auxiliary capacitor is equipped between the pivot flange；
The main capacitor is respectively equipped with the supporting insulator connecting with the pivot flange up and down, and the supporting insulator is located at
On the axle center of the insulating sleeve；
Guide flange is respectively equipped at the top and bottom of the main capacitor, the inner headed face of the guide flange is arranged in the branch
Outside the periphery for supportting insulator bottom end；
Be arranged between the inner headed face of the guide flange at the top of the main capacitor and the supporting insulator periphery there are
Certain down suction, the size in the gap by the guide flange, the supporting insulator relative mounting location and
The main capacitor maximum swelling amount determines.
2. a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer as described in claim 1, special
Sign is: the step (1) is that test voltage is applied between the two end electrodes and ground of the main capacitor, the auxiliary electricity
The two end electrodes of container are grounded.
3. a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer as described in claim 1, special
Sign is: the valve rubber matched is equipped at the top of the supporting insulator, the gap is greater than the rubber mat thickness；
The outer circle of the guide flange inner headed face of the main capacitor end and the supporting insulator bottom end being inserted
Face is connected radially by valve rubber.
4. a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer as claimed in claim 3, special
Sign is: the guide flange at the top of the main capacitor is arranged in and passes through the branch of its side inner headed face corresponding thereto
The top side periphery for supportting insulator is flexibly connected；
The guide flange that the main capacitor bottom end is arranged in is flexibly connected with the supporting insulator corresponding thereto.
5. a kind of industrial frequency withstand voltage test method of equal potential shielded capacitor voltage transformer as described in claim 1, special
Sign is: the auxiliary capacitor is connect by stud and nut with the annular electrode, and the stud passes through the auxiliary electricity
Container extends to its corresponding described pivot flange.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310611820.XA CN104678263B (en) | 2013-11-26 | 2013-11-26 | A kind of industrial frequency experiment method suitable for equal potential shielded capacitor voltage transformer |
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| CN201310611820.XA CN104678263B (en) | 2013-11-26 | 2013-11-26 | A kind of industrial frequency experiment method suitable for equal potential shielded capacitor voltage transformer |
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| CN104678263A CN104678263A (en) | 2015-06-03 |
| CN104678263B true CN104678263B (en) | 2019-01-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4340924A (en) * | 1980-10-27 | 1982-07-20 | General Electric Company | Grading means for high voltage metal enclosed gas insulated surge arresters |
| CN1584615A (en) * | 2004-06-15 | 2005-02-23 | 崔文军 | Method and apparatus for industrial frequency voltage holding test of switch on column |
| CN1912638A (en) * | 2006-08-17 | 2007-02-14 | 国网武汉高压研究院 | Can type capacitor voltage mutual inductor |
| CN101464489A (en) * | 2009-01-21 | 2009-06-24 | 中国第一冶金建设有限责任公司 | Industrial frequency inductance-regulation resonance pressure-resistant method |
| CN102024557A (en) * | 2009-09-21 | 2011-04-20 | 江苏思源赫兹互感器有限公司 | Electronic type current transformer |
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
-
2013
- 2013-11-26 CN CN201310611820.XA patent/CN104678263B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4340924A (en) * | 1980-10-27 | 1982-07-20 | General Electric Company | Grading means for high voltage metal enclosed gas insulated surge arresters |
| CN1584615A (en) * | 2004-06-15 | 2005-02-23 | 崔文军 | Method and apparatus for industrial frequency voltage holding test of switch on column |
| CN1912638A (en) * | 2006-08-17 | 2007-02-14 | 国网武汉高压研究院 | Can type capacitor voltage mutual inductor |
| CN101464489A (en) * | 2009-01-21 | 2009-06-24 | 中国第一冶金建设有限责任公司 | Industrial frequency inductance-regulation resonance pressure-resistant method |
| CN102024557A (en) * | 2009-09-21 | 2011-04-20 | 江苏思源赫兹互感器有限公司 | Electronic type current transformer |
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
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Effective date of registration: 20170601 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China-EPRI Electric Power Engineering Co., Ltd. Applicant after: Electric Power Research Institute of State Grid Anhui Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Smart Grid Institute Applicant before: China-EPRI Electric Power Engineering Co., Ltd. Applicant before: Electric Power Research Institute of State Grid Anhui Electric Power Company |
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