CN104678263A - Power frequency testing method for equipotential shielding capacitor type voltage transformer - Google Patents
Power frequency testing method for equipotential shielding capacitor type voltage transformer Download PDFInfo
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- CN104678263A CN104678263A CN201310611820.XA CN201310611820A CN104678263A CN 104678263 A CN104678263 A CN 104678263A CN 201310611820 A CN201310611820 A CN 201310611820A CN 104678263 A CN104678263 A CN 104678263A
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Abstract
The invention relates to a power frequency withstand voltage testing method for an equipotential shielding capacitor type voltage transformer, and is suitable for a gap between an inner main capacitor and an outer auxiliary capacitor of the equipotential shielding capacitive type voltage transformer. The method comprises the following steps of applying the testing voltage between electrodes at the two ends of the auxiliary capacitor and the ground, wherein the electrodes at the two ends of the auxiliary capacitor are respectively grounded; increasing the testing voltage from lower voltage to higher voltage, maintaining for five minutes, and decreasing to the lower voltage. The method has the advantages that the radial insulation strength between the inner main capacitor and the outer shielding auxiliary capacitor of each equipotential shielding capacitor unit of an ultra-high voltage equipotential shielding capacitor type voltage transformer can be verified, and the breakdown is avoided when overvoltage happens.
Description
Technical field:
The present invention relates to a kind of industrial frequency experiment method, more specifically relate to a kind of for the main capacitor in equal potential shielded capacitor voltage transformer and the gap power frequency withstand test method between auxiliary capacitor.
Background technology:
Rapidly, this just proposes high request to the Measurement accuracy of extra-high voltage grid voltage in China's AC extra high voltage technology of transmission of electricity development in recent years.Current high voltage meter mainly contains following three kinds: electromagnetic potential transformer, capacitance type potential transformer and electronic type voltage transformer.Electromagnetic potential transformer is used for the voltage measurement of below 110kV electric pressure, and capacitance type potential transformer is commonly used to the voltage measurement of 110kV above.Electronic type voltage transformer is still in research and development and experimental stage at present, and the problems such as its voltage measurement accuracy, laser life-span, system reliability need be researched and solved further, not yet drop into engineer applied at present.
For the electric pressure of more than 500kV, especially for extra-high voltage grade (1000kV), electromagnetic potential transformer is owing to insulating difficulty and easily at primary side generation ferroresonance and then cause electric power accident, not adopting.Capacitance type potential transformer because its structure is simple, low cost, primary side can not with electrical network generation ferroresonance, high reliability, be widely used in ultra-high/extra-high voltage electric pressure line voltage and measured.
But for being applied to the capacitance type potential transformer in ultra-high/extra-high voltage field, there is following technical difficulty:
(1) over the ground stray capacitance on the impact of capacitance type potential transformer accuracy of measurement
NORTHWEST CHINA electrical network 750kV capacitance type potential transformer actual measured results shows, the measuring error that stray capacitance causes over the ground can up to more than 0.2%.At present in the industry by adopting the method increasing electric capacity to reduce the impact of stray capacitance on accuracy measurement.But for extra-high voltage grade (1000kV and more than), stray capacitive currents enlarges markedly, and can reach 20mA.Capacitance type potential transformer now, even if electric capacity increases to 10000pf, its class of accuracy also cannot reach the standard of 0.1 grade.
(2) field-checking difficulty
After usual capacitance type potential transformer is installed at the scene, need to carry out field-checking so that contrast differences and angular difference are revised in time.But at ultra-high voltage transformer station, because the factors such as transformer station's place situation, on-the-spot serious electromagnetic interference (EMI) exist, so it is very difficult to carry out field-checking to extra-high voltage capacitor voltage transformer.
(3) transient state individual features problem
The response characteristic of widespread use to voltage transformer (VT) of digital relay protection system proposes more and more higher requirement, requires that transformer secondary voltage quick and precisely should reflect the change of primary voltage.Respective rules requirement, after transformer primary shorted to earth, secondary voltage should be down to less than 0.1 times of initial value within 0.2 second.The ferroresonance damper that existing CVT all adopts energy-storage travelling wave tube to form, to suppress issuable ferroresonance in electromagnetic unit.The introducing of energy-storage travelling wave tube makes the response characteristic of mutual inductor be deteriorated, and is difficult to the requirement meeting extra-high voltage grid relay protection quick and precisely action.
And in capacitance type potential transformer, measure between dividing potential drop main capacitor and ring electrode and shielding auxiliary capacitor and do not allowed any electrical connection, namely, for integral capacitor voltage divider, a dividing potential drop main capacitor electric loop in series is measured by some joints and each shielding auxiliary capacitor group shield loop in series is separate.With gas insulating material, insulating oil or other meet the demands in good insulation radial between insulating material keeping capacitor unit internal measurement dividing potential drop main capacitor and ring electrode and shielding auxiliary capacitor.
Under switching impulse transient operating mode when interchange steady state condition and switching overvoltage ripple via line are delivered to transformer station, ensure to measure reliable electric insulation between dividing potential drop main capacitor and shielding auxiliary capacitor, thus the normal operation guaranteeing novel extra-high-voltage equal potential shielded capacitor voltage transformer is vital.
Summary of the invention:
The object of this invention is to provide a kind of industrial frequency experiment method being applicable to equal potential shielded capacitor voltage transformer, the method checking extra-high-voltage equal potential shielded capacitor voltage transformer often saves the radial insulation intensity between the internal layer main capacitor of equivalent potential screen capacitor unit and outer shielding auxiliary capacitor, guarantees that it can bear ectonexine superpotential and can not puncture.
For achieving the above object, the present invention is by the following technical solutions: a kind of power frequency withstand test method of equal potential shielded capacitor voltage transformer, and described method is applicable to the gap between the internal layer main capacitor of described equal potential shielded capacitor voltage transformer and outer auxiliary capacitor; The method comprises the following steps:
(1) between two end electrodes trial voltage being applied to described auxiliary capacitor and ground, the equal ground connection of described main capacitor two end electrodes;
(2) described trial voltage is increased to trial voltage value from initial voltage value, keeps 5 minutes, is dropping to low voltage.
The power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer provided by the invention, described step (1) be trial voltage is applied to described main capacitor between two end electrodes and ground, the equal ground connection of two end electrodes of described auxiliary capacitor.
The power frequency withstand test method of a kind of potential screen capacitance type potential transformer provided by the invention, described method is carried out in single-unit equivalent potential screen capacitor;
The described initial voltage value of described step (2) and trial voltage value select corresponding trial voltage value according to the electric parameter of described single-unit equivalent potential screen capacitor to testing requirements.
The power frequency withstand test method of another preferred a kind of equal potential shielded capacitor voltage transformer provided by the invention, described single-unit equivalent potential screen capacitor comprises pivot flange, is arranged on main capacitor between upper and lower described pivot flange, that be coaxially provided with successively from inside to outside, interior insulating material, ring electrode and insulating sleeve; Top and the bottom of described insulating sleeve are respectively equipped with the sleeve flange be connected with described pivot flange, between the described pivot flange that described ring electrode upper and lower side is corresponding with its upper and lower side, be provided with auxiliary capacitor.
The power frequency withstand test method of a preferred a kind of equal potential shielded capacitor voltage transformer more provided by the invention, described main capacitor is respectively equipped with the supporting insulator be connected with described pivot flange up and down, and described supporting insulator is positioned on the axle center of described insulating sleeve.
The power frequency withstand test method of another preferred a kind of equal potential shielded capacitor voltage transformer provided by the invention, top and the bottom of described main capacitor are respectively equipped with guide flange, and the inner headed face of described guide flange is arranged on outside the periphery of described supporting insulator bottom.
The power frequency withstand test method of another preferred a kind of equal potential shielded capacitor voltage transformer provided by the invention, be arranged between the inner headed face of the described guide flange at described main capacitor top and described supporting insulator periphery and leave certain down suction, the size in described gap is determined by the relative installation of described guide flange, described supporting insulator and described main capacitor maximum swelling amount.
The power frequency withstand test method of another preferred a kind of equal potential shielded capacitor voltage transformer provided by the invention, be provided with at described supporting insulator top the rubber gasket matched, described gap is greater than described rubber gasket thickness;
The described guide flange inner headed face of described main capacitor end is connected by rubber gasket diametrically with the periphery of the described supporting insulator bottom of inserting wherein.
The power frequency withstand test method of another preferred a kind of potential screen capacitance type potential transformer provided by the invention, the described guide flange being arranged on described main capacitor top is flexibly connected with side, the top periphery of described supporting insulator corresponding thereto by its side inner headed face;
The described guide flange being arranged on described main capacitor bottom is flexibly connected with described supporting insulator corresponding thereto.
The power frequency withstand test method of another preferred a kind of equal potential shielded capacitor voltage transformer provided by the invention, described auxiliary capacitor is connected with described ring electrode with nut by stud, and described stud extends through the described pivot flange of described auxiliary capacitor to its correspondence;
With immediate prior art ratio, the invention provides technical scheme and there is following excellent effect
1, the present invention detects extra-high-voltage equal potential shielded capacitor voltage transformer and often saves radial insulation intensity between the internal layer main capacitor of equivalent potential screen capacitor unit and outer shielding auxiliary capacitor, guarantees that it can bear ectonexine superpotential and can not puncture;
2, the test method in the present invention effectively avoids the generation of resonance in test loop;
3, test method of the present invention is simple, in convenient operation.
Accompanying drawing explanation
Fig. 1 is test schematic of the present invention;
Fig. 2 is test schematic of the present 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-ring electrode, 5-supporting insulator, 6-pivot flange; 7-sleeve flange, 8-rubber gasket, 9-gap, 10-guide flange.
Embodiment
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As Figure 1-3, the power frequency withstand test method of the invention equal potential shielded capacitor voltage transformer of this example is applicable to the gap between the main capacitor of described equal potential shielded capacitor voltage transformer and auxiliary capacitor; The method comprises the following steps:
(1) trial voltage is applied to described auxiliary capacitor C
2two end electrodes and ground between, described main capacitor C
1the equal ground connection of two end electrodes;
(2) described trial voltage continues to be increased to trial voltage value from low voltage initial value, keeps 5 minutes, at continuous decrease to low voltage, then cuts off the electricity supply.
Described low voltage initial value in described step (2) and trial voltage value select corresponding trial voltage value according to the electric parameter of described single-unit equivalent potential screen capacitor to testing requirements.
Described step (1) is for be applied to described main capacitor C by trial voltage
1two end electrodes and ground between, described auxiliary capacitor C
2the equal ground connection of two end electrodes.Described method is carried out in single-unit equivalent potential screen capacitor.
Described single-unit equivalent potential screen capacitor comprises pivot flange 6, is arranged on main capacitor 1 between upper and lower described pivot flange 6, that be coaxially provided with successively from inside to outside, interior insulating material, ring electrode 4 and insulating sleeve 2; Top and the bottom of described insulating sleeve 2 are respectively equipped with the sleeve flange 2 be connected with described pivot flange 6, between the described pivot flange 6 that described ring electrode 4 upper and lower side is corresponding with its upper and lower side, be provided with auxiliary capacitor 3.
Described main capacitor about 1 is respectively equipped with the supporting insulator 5 be connected with described pivot flange 6, and described supporting insulator 5 is positioned on the axle center of described insulating sleeve 2.
Top and the bottom of described main capacitor 1 are respectively equipped with guide flange 10, and the inner headed face of described guide flange 10 is arranged on outside the periphery of described supporting insulator 5 bottom.
Be arranged between the inner headed face of the described guide flange 10 at described main capacitor 1 top and described supporting insulator 5 periphery and leave certain down suction 9, the size in described gap 9 is determined by the relative installation of described guide flange 10, described supporting insulator 5 and described main capacitor 1 maximum swelling amount.
Be provided with at described supporting insulator 5 top the rubber gasket 8 matched, described gap 9 is greater than described rubber gasket 8 thickness;
Described guide flange 10 inner headed face of described main capacitor end is connected by rubber gasket 8 diametrically with the periphery of described supporting insulator 5 bottom of inserting wherein.
The described guide flange 10 being arranged on described main capacitor 1 top is flexibly connected with side, the top periphery of described supporting insulator 5 corresponding thereto by its side inner headed face; The described guide flange 10 being arranged on described main capacitor 1 bottom is flexibly connected with described supporting insulator 5 corresponding thereto.
Described auxiliary capacitor 3 is connected with described ring electrode 4 with nut by stud, and described stud extends through the described pivot flange 6 of described auxiliary capacitor 3 to its correspondence;
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of this right.
Claims (10)
1. a power frequency withstand test method for equal potential shielded capacitor voltage transformer, described method is applicable to the gap between the internal layer main capacitor of described equal potential shielded capacitor voltage transformer and outer auxiliary capacitor; It is characterized in that: the method comprises the following steps:
(1) between two end electrodes trial voltage being applied to described auxiliary capacitor and ground, the equal ground connection of described main capacitor two end electrodes;
(2) described trial voltage is increased to trial voltage value from initial voltage value, keeps 5 minutes, is dropping to described low voltage.
2. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 1, it is characterized in that: described step (1) be trial voltage is applied to described main capacitor between two end electrodes and ground, the equal ground connection of two end electrodes of described auxiliary capacitor.
3. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 1 or 2, is characterized in that: described method is carried out on single-unit equivalent potential screen capacitor unit;
The initial voltage value of described step (2) and trial voltage value select corresponding trial voltage value according to the electric parameter of described single-unit equivalent potential screen capacitor to testing requirements.
4. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 3, is characterized in that: described single-unit equivalent potential screen capacitor comprises pivot flange, is arranged on main capacitor between upper and lower described pivot flange, that be coaxially provided with successively from inside to outside, interior insulating material, ring electrode and insulating sleeve; Top and the bottom of described insulating sleeve are respectively equipped with the sleeve flange be connected with described pivot flange, between the described pivot flange that described ring electrode upper and lower side is corresponding with its upper and lower side, be provided with auxiliary capacitor.
5. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 4, it is characterized in that: described main capacitor is respectively equipped with the supporting insulator be connected with described pivot flange up and down, and described supporting insulator is positioned on the axle center of described insulating sleeve.
6. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 5, it is characterized in that: top and the bottom of described main capacitor are respectively equipped with guide flange, the inner headed face of described guide flange is arranged on outside the periphery of described supporting insulator bottom.
7. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 6, it is characterized in that: be arranged between the inner headed face of the described guide flange at described main capacitor top and described supporting insulator periphery and leave certain down suction, the size in described gap is determined by the relative installation of described guide flange, described supporting insulator and described main capacitor maximum swelling amount.
8. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 7, is characterized in that: be provided with at described supporting insulator top the rubber gasket matched, and described gap is greater than described rubber gasket thickness;
The described guide flange inner headed face of described main capacitor end is connected by rubber gasket diametrically with the periphery of the described supporting insulator bottom of inserting wherein.
9. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 8, is characterized in that: the described guide flange being arranged on described main capacitor top is flexibly connected with side, the top periphery of described supporting insulator corresponding thereto by its side inner headed face;
The described guide flange being arranged on described main capacitor bottom is flexibly connected with described supporting insulator corresponding thereto.
10. the power frequency withstand test method of a kind of equal potential shielded capacitor voltage transformer as claimed in claim 4, it is characterized in that: described auxiliary capacitor is connected with described ring electrode with nut by stud, described stud extends through the described pivot flange of described auxiliary capacitor to its correspondence.
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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 true CN104678263A (en) | 2015-06-03 |
| CN104678263B 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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