CN105372617A - Three-phase capacitor type voltage transformer error integral verification method - Google Patents
Three-phase capacitor type voltage transformer error integral verification method Download PDFInfo
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- CN105372617A CN105372617A CN201510923504.5A CN201510923504A CN105372617A CN 105372617 A CN105372617 A CN 105372617A CN 201510923504 A CN201510923504 A CN 201510923504A CN 105372617 A CN105372617 A CN 105372617A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a three-phase capacitor type voltage transformer error integral verification method. The method includes the following steps that: a voltage regulator, an exciting transformer and a reactor are connected with one another in sequence, and a standard PT and three-phase CVTs are connected in parallel with the output end of the reactor; the secondary output high-voltage end of the standard PT is connected with the a interface of a three-phase multifunction calibrator; the secondary output low-voltage end of the standard PT is connected with the x interface and k interface of the three-phase multifunction calibrator; the secondary output high-voltage ends of the three-phase CVTs are connected with the secondary output high-voltage end of the standard PT simultaneously; the secondary output low-voltage ends of the three-phase CVTs are connected with the Da interface, Db interface and Dc interface of the three-phase multifunction calibrator respectively; the primary low-voltage end of the standard PT and the primary low-voltage ends of the three-phase CVTs are grounded a one-point manner respectively; and voltage boosting is adjusted, and the error value of the three-phase CVT to be measured is obtained from the output result of the three-phase multifunction calibrator. With the three-phase capacitor type voltage transformer error integral verification method of the invention adopted, the error performance of the CVT under an actual running state can be detected accurately, and the number of times of voltage boosting can be decreased, and the safety of equipment can be increased; and data can be automatically recorded and stored, so that test efficiency can be improved.
Description
Technical field
The present invention relates to capacitance type potential transformer error testing technical field, be specially a kind of three-phase Capacitor voltage transformer error overall calibration method.
Background technology
Capacitance type potential transformer (CapacitorVoltageTransformer, CVT) with traditional electromagnetic potential transformer (PotentialTransformer, PT) compare, have that electric field intensity nargin is large, insulating reliability is high, capacitive part can doublely do coupling condenser for radio frequency carrier channel, ferroresonance can not be formed, the advantages such as thunder and lightning wave head, low price can be cut down with switched fracture capacitance.CVT had been widely used in the electric system of 110kV and above in recent years.Can realize accurately examining and determine the error of CVT, be directly connected to power grid security, the justice of economical operation and high pressure measurement and just.
Because CVT presents capacitive characteristics, at present the main method of series resonance reactor boosting that adopts carries out single-phase error calibrating to CVT, as shown in Figure 1.But adopt single plane method to there is following drawback: it is large that the testing equipments such as the change of (1) reactor, excitation and pressure regulator have volume, heavy feature, then need the testing equipments such as the artificial reactor of ornaments again when often finishing a CVT error test commutation, the single-phase calibrating of CVT is wasted time and energy, inefficiency.(2) for field erected CVT, adjacent object or adjacent phase electrification in high voltage part all can change the stray capacitance of the high-pressure section of this phase CVT and the distribution of stray capacitance over the ground.Therefore the on-the-spot CVT accuracy run easily is subject to the impact of proximity effect.And single-phase error calibration method and actual operating mode do not conform to, the error performance under on-the-spot actual motion state accurately cannot be detected.(3) calibrating of CVT site error adopts traditional calibration equipment, rear manual record raw data of having boosted.Need cost additionally manually to carry out the revision of the convention and arrangement to data after test, finally form examining report.This process is loaded down with trivial details, easily make mistakes, inefficiency.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of simultaneously can boosting to three of a same interval CVT, the overall calibration method of error under three-phase Capacitor voltage transformer (VT) actual motion state can be detected, the method testing efficiency and accuracy higher.Technical scheme is as follows:
A kind of three-phase Capacitor voltage transformer error overall calibration method, comprising:
A) connecting test circuit:
Test circuit comprises pressure regulator, exciting transformer, reactor, standard P T and three-phase multifunctional tester;
Pressure regulator input end is connected to single-phase AC 220V power supply, and output terminal is connected to the input end of exciting transformer;
Exciting transformer exports low pressure end ground connection, exports one end that high-pressure side is connected to reactor;
The other end of reactor is connected to a secondary input end of standard P T;
The secondary of standard P T exports a interface that high-pressure side is connected to three-phase multifunctional tester, and secondary exports x interface and the k interface that low pressure end is connected to three-phase multifunctional tester; And standard P T low pressure end one point earth;
B) three-phase CVT to be measured is accessed test circuit:
One secondary input end of three-phase CVT to be measured is connected to the output terminal of reactor, secondary exports the secondary output high-pressure side that high-pressure side is connected to standard P T simultaneously, and the secondary of A phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
ainterface, the secondary of B phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
binterface, the secondary of C phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
cinterface; And three-phase CVT low pressure end one point earth;
C) regulate boosting, obtain the error amount of A phase CVT to be measured, B phase CVT and C phase CVT from the Output rusults of three-phase multifunctional tester.
Further, described reactor adopts turnable resonator reactor.
Further, described pressure regulator adopts automatic coupling voltage regulator.
The invention has the beneficial effects as follows:
1) the present invention can detect the three-phase CVT error effect amount that the mutual interference of electric field brings under actual motion state, thus accurately detect the error performance under CVT actual motion state, ensure that the performance reliability of CVT, better meet the service requirement of intelligent grid;
2) the present invention can meet the requirement of the CVT test of 500kV and following electric pressure, and once boosting can detect three-phase CVT error performance, greatly shortens working hours, and reduces boosting number of times, adds the security of equipment;
3) all testing equipments can concentrate in together at detection three-phase CVT by the present invention, and avoid carrying back and forth, greatly save artificial and time cost, work on the spot efficiency significantly improves;
4) the present invention can obtain the signal of the three tested CVT in road and a road respective standard device simultaneously, and carries out error performance calculating, calculates the error performance data obtaining three-phase CVT simultaneously, substantially increases testing efficiency;
5) the present invention adopts three-phase multifunctional tester, can realize the automatic rounding of three-phase error information, storage and export function, eliminate and manually record raw data, greatly reduce the error rate of data, is conducive to preservation and the management of error information.
Accompanying drawing explanation
Fig. 1 is the single-phase CVT error testing test connection figure adopted at present.
Fig. 2 is three-phase CVT error Whole verification test connection figure of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.Fig. 2 is three-phase CVT error Whole verification test connection figure, have employed the three-phase multifunctional tester with three-phase error comparison function, three-phase multifunctional tester also has data automatic rounding, storage and export function, eliminate and manually record raw data, reduce the error rate of data, be conducive to preservation and the management of error information.
Test method is as follows:
1) connecting test circuit:
Wherein, test circuit comprises pressure regulator, exciting transformer, reactor, standard P T and three-phase multifunctional tester.
During test, select single-phase AC 220V power supply supply pressure regulator, the defeated output terminal of pressure regulator is connected to the input end of exciting transformer.Pressure regulator adopts automatic coupling voltage regulator.
Exciting transformer exports low pressure end ground connection, and export one end that high-pressure side is connected to reactor, the other end of reactor is connected to a secondary input end of standard P T.Reactor adopts turnable resonator reactor.
The secondary of standard P T exports a interface that high-pressure side is connected to three-phase multifunctional tester, and secondary exports x interface and the k interface that low pressure end is connected to three-phase multifunctional tester; And standard P T low pressure end one point earth.
2) three-phase CVT to be measured is accessed test circuit:
One secondary input end of three-phase CVT to be measured is connected to the output terminal of reactor, secondary exports the secondary output high-pressure side that high-pressure side is connected to standard P T simultaneously, and the secondary of A phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
ainterface, the secondary of B phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
binterface, the secondary of C phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
cinterface; And three-phase CVT low pressure end one point earth.
3) regulate boosting, obtain the error amount of A phase CVT to be measured, B phase CVT and C phase CVT from the Output rusults of three-phase multifunctional tester:
Three-phase multifunctional tester adopts standard output secondary singal as monitor signal, utilizes D
a, D
b, D
cinterface respectively with the potential difference calculating error values of k interface, namely the error amount of A phase CVT to be measured is D
athe potential difference of interface and k interface; The error amount of B phase CVT to be measured is D
bthe potential difference of interface and k interface; The error amount of C phase CVT to be measured is D
cthe potential difference of interface and k interface.
Finally directly can derive probation redport from three-phase multifunctional tester.
Claims (3)
1. a three-phase Capacitor voltage transformer error overall calibration method, is characterized in that, comprising:
Connecting test circuit:
Test circuit comprises pressure regulator, exciting transformer, reactor, standard P T and three-phase multifunctional tester;
Pressure regulator input end is connected to single-phase AC 220V power supply, and output terminal is connected to the input end of exciting transformer;
Exciting transformer exports low pressure end ground connection, exports one end that high-pressure side is connected to reactor;
The other end of reactor is connected to a secondary input end of standard P T;
The secondary of standard P T exports a interface that high-pressure side is connected to three-phase multifunctional tester, and secondary exports x interface and the k interface that low pressure end is connected to three-phase multifunctional tester; And standard P T low pressure end one point earth;
Three-phase CVT to be measured is accessed test circuit:
One secondary input end of three-phase CVT to be measured is connected to the output terminal of reactor, secondary exports the secondary output high-pressure side that high-pressure side is connected to standard P T simultaneously, and the secondary of A phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
ainterface, the secondary of B phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
binterface, the secondary of C phase CVT exports the D that low pressure end is connected to three-phase multifunctional tester
cinterface; And three-phase CVT low pressure end one point earth;
Regulate boosting, obtain the error amount of A phase CVT to be measured, B phase CVT and C phase CVT from the Output rusults of three-phase multifunctional tester.
2. three-phase Capacitor voltage transformer error overall calibration method according to claim 1, is characterized in that, described reactor adopts turnable resonator reactor.
3. three-phase Capacitor voltage transformer error overall calibration method according to claim 1, is characterized in that, described pressure regulator adopts automatic coupling voltage regulator.
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| CN201510923504.5A CN105372617A (en) | 2015-12-11 | 2015-12-11 | Three-phase capacitor type voltage transformer error integral verification method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911502A (en) * | 2016-06-12 | 2016-08-31 | 江西飞尚科技有限公司 | Integral capacitance inconsistence improvement method in magnetic flux collection device |
| CN106772200A (en) * | 2017-01-25 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | CVT error in dipping anomaly assessment method and system based on capacitive earth current |
| CN110689252A (en) * | 2019-09-20 | 2020-01-14 | 云南电网有限责任公司电力科学研究院 | Capacitive voltage transformer metering error situation sensing system |
| CN112180137A (en) * | 2020-09-28 | 2021-01-05 | 国网山东省电力公司莱芜供电公司 | High-precision capacitance voltage division type voltage transformer and voltage measurement method |
| CN112305484A (en) * | 2020-09-16 | 2021-02-02 | 国网河北省电力有限公司电力科学研究院 | Method and device for judging harmonic measurement accuracy of capacitor voltage transformer |
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| CN202134388U (en) * | 2011-05-31 | 2012-02-01 | 中国西电电气股份有限公司 | One-time adjusting mechanism of capacitance voltage transformer |
| WO2013063856A1 (en) * | 2011-11-03 | 2013-05-10 | 四川电力科学研究院 | Method for testing error influence amount on high voltage three-phase current transformer by high voltage leakage current |
| CN104155627A (en) * | 2014-08-18 | 2014-11-19 | 国家电网公司 | Error characteristic detection method of extra high voltage capacitive voltage transformer |
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| CN101738591A (en) * | 2008-11-13 | 2010-06-16 | 国网电力科学研究院 | On-site CVT integrated verification system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911502A (en) * | 2016-06-12 | 2016-08-31 | 江西飞尚科技有限公司 | Integral capacitance inconsistence improvement method in magnetic flux collection device |
| CN105911502B (en) * | 2016-06-12 | 2019-02-22 | 江西飞尚科技有限公司 | A kind of inconsistent ameliorative way of integrating capacitor in magnetic flux Acquisition Instrument |
| CN106772200A (en) * | 2017-01-25 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | CVT error in dipping anomaly assessment method and system based on capacitive earth current |
| CN106772200B (en) * | 2017-01-25 | 2023-07-21 | 云南电网有限责任公司电力科学研究院 | CVT metering error abnormity evaluation method and system based on capacitance-to-ground current |
| CN110689252A (en) * | 2019-09-20 | 2020-01-14 | 云南电网有限责任公司电力科学研究院 | Capacitive voltage transformer metering error situation sensing system |
| CN110689252B (en) * | 2019-09-20 | 2023-07-18 | 云南电网有限责任公司电力科学研究院 | Capacitive voltage transformer metering error situation awareness system |
| CN112305484A (en) * | 2020-09-16 | 2021-02-02 | 国网河北省电力有限公司电力科学研究院 | Method and device for judging harmonic measurement accuracy of capacitor voltage transformer |
| CN112305484B (en) * | 2020-09-16 | 2023-02-28 | 国网河北省电力有限公司电力科学研究院 | Method and device for judging harmonic measurement accuracy of capacitor voltage transformer |
| CN112180137A (en) * | 2020-09-28 | 2021-01-05 | 国网山东省电力公司莱芜供电公司 | High-precision capacitance voltage division type voltage transformer and voltage measurement method |
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