CN114089018A - Method for testing faults of electromagnetic units of capacitor voltage transformer - Google Patents
Method for testing faults of electromagnetic units of capacitor voltage transformer Download PDFInfo
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- CN114089018A CN114089018A CN202111304308.1A CN202111304308A CN114089018A CN 114089018 A CN114089018 A CN 114089018A CN 202111304308 A CN202111304308 A CN 202111304308A CN 114089018 A CN114089018 A CN 114089018A
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- damping
- faults
- capacitor voltage
- voltage transformer
- electromagnetic unit
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
Abstract
The invention discloses a method for testing the faults of an electromagnetic unit of a capacitor voltage transformer, which relates to the technical field of electric power, can not monitor the state of the faults of heating of an oil tank and abnormal secondary voltage caused by damage of an electromagnetic unit damper at present and can not solve the faults of the electromagnetic unit of the capacitor voltage transformer by effective verification means, and discloses a method for testing the faults of the electromagnetic unit of the capacitor voltage transformer, wherein the faults of the electromagnetic unit are mostly secondary winding faults through routine tests on the electromagnetic unit of the capacitor voltage transformer, the structure and the parameters of a secondary loop winding of the capacitor voltage transformer are researched, an effective method for pressurizing a damping winding and verifying whether the damping current is in a standard value is provided, so that the difficulty in judging the heating faults of the electromagnetic unit of the capacitor voltage transformer is solved, and an effective solution is provided for the detection of the electromagnetic unit faults of all the capacitor voltage transformers.
Description
Technical Field
The invention relates to the technical field of power equipment fault testing, in particular to a method for testing a fault of an electromagnetic unit of a capacitor voltage transformer.
Background
The project belongs to the electrical engineering subject and relates to the high-voltage engineering major, wherein a 66kV I bus capacitor voltage transformer A, B phase electromagnetic unit is heated when a certain 750kV transformer substation is electrified, the fault is not found in the traditional electrified detection, and the fault is also a new fault of the contact capacitor voltage transformer, and is a primary centralized embodiment of the faults of all capacitor voltage transformer electromagnetic units.
Disclosure of Invention
The project provides an effective verification method for the faults of the electromagnetic units of the capacitor voltage transformer, the faults of the electromagnetic units of the capacitor voltage transformer are mostly found to be secondary winding faults through routine tests on the electromagnetic units of the capacitor voltage transformer, the structure and parameters of a secondary loop winding of the capacitor voltage transformer are researched, and an effective verification method for pressurizing a damping winding and verifying whether the damping current is at a standard value is provided, so that the difficulty of the heating faults of the electromagnetic units of the capacitor voltage transformer is solved, and an effective solution is provided for the detection of the faults of the electromagnetic units of all the capacitor voltage transformers.
The detection of the electromagnetic unit is specifically divided into two steps: 1) whether the secondary winding is damaged or not is verified by measuring whether the insulation resistance and the direct current resistance meet the regulations or not, and if the secondary winding is abnormal, the secondary winding fails; if the damping current is normal, the next step is carried out, 2) the state of the damper is checked, the two ends of the damping windings da-dn are short-circuited, the d 1-d 2 connecting sheets are opened, meanwhile, the N-X connecting sheets are also required to be opened, so that the intermediate transformer runs in a no-load mode during a high-voltage test, an independent damping loop capable of testing the two ports is formed, a power frequency voltage with an effective value of 100V is applied to the two ports d 1-d 2 of the damper, the damping current is tested, and finally the criterion is as follows according to the test result: if the damping current is 0, it indicates that the damping loop is open-circuited, the damping resistor may be burnt, if the damping current is greater than 0 and not greater than 1A, the damping loop is normal, otherwise, if the damping current exceeds the range, it is determined that the damper capacitor has a fault, and the principle is as shown in formula-1.
In the formula: nominal value of each element: 50 mH; c is 200F, the effective value of the damping current rating is about 1A.
The invention has the beneficial effects that:
the method has the advantages that the method has guiding significance for operation maintenance and fault analysis of the electromagnetic unit of the voltage transformer in the power system along with the wide application of project achievements, the fault cause analysis of the electromagnetic unit of the voltage transformer and the provided effective verification method are popularized and applied in the power system, the fault rate of the electromagnetic unit of the voltage transformer in the power system can be reduced by more than 80%, economic and social benefits are very obvious, the maintenance efficiency of the electromagnetic unit of the voltage transformer is greatly improved, the fault rate of the electromagnetic unit is reduced, the effective verification method for the fault of the electromagnetic unit is provided, the progress of the power system is powerfully promoted, and the important role is played in guaranteeing the safety of a power grid and promoting the healthy development of economy and society.
Drawings
FIG. 1 is a schematic diagram of the testing method of the present invention.
Detailed Description
Embodiment 1, as shown in the figure, the present invention provides a method for testing a fault of an electromagnetic unit of a capacitor voltage transformer;
firstly, whether a secondary winding is damaged or not is verified by measuring whether insulation resistance and direct current resistance meet regulations or not, and if the secondary winding is abnormal, the secondary winding fails; if the damping loop is normal, the next step is carried out, the state of the damper is checked secondly, the d 1-d 2 connecting sheet is opened by short-circuiting da-dn, and meanwhile, the N-X connecting sheet is opened, so that the intermediate transformer runs in a no-load mode during a high-voltage test, an independent damping loop capable of testing two ports is formed, power frequency voltage with the effective value of 100V is applied to the two ports d 1-d 2 of the damper, the current of the damping loop is tested, and finally the judgment is carried out according to the test result;
the judgment basis is as follows:
if the damping current is 0, the damping loop is open-circuited, and the damping resistor may be burnt out;
if the damping current is greater than 0 and not greater than 1A, the damping loop is normal;
if the damping current is far larger than 1A, judging that the damper capacitor has a fault;
the rated values of damping currents of different products (different types and voltage levels) are different, and the standard values in the method cannot be directly applied, the method is mainly characterized in that a thought for solving the problems is provided by taking a high-voltage test as a means, therefore, an electric schematic diagram and design parameters of a damper of a manufacturer are referred, the rated values are calculated according to a formula-1, in addition, the testing method can be widely applied to applying a power frequency voltage l 0V from a d 1-d 2 terminal, and then testing the current of a damping loop, under the normal condition, the damping current is not more than 0.1A, meanwhile, the testing is combined with three-phase transverse comparison and longitudinal comparison comprehensive analysis of historical data, and the judgment accuracy is ensured.
Claims (1)
1. A method for testing the fault of an electromagnetic unit of a capacitor voltage transformer is characterized by comprising the following steps: the method comprises the following steps:
(1) whether the secondary winding is damaged or not is verified by measuring whether the insulation resistance and the direct current resistance meet the regulations or not, and if the secondary winding is abnormal, the secondary winding fails; if the standard condition is normal, the next step is carried out;
(2) checking the state of the damper, short-circuiting the two ends of the damping windings da-dn, opening d 1-d 2 connecting sheets, and opening N-X connecting sheets to enable the intermediate transformer to run in no-load mode during high-voltage test and form an independent damping loop capable of testing the two ports, applying power frequency voltage with an effective value of 100V to the two ports d 1-d 2 of the damper to test the damping current of the damper, and finally verifying according to a test result, wherein the criterion is as follows: if the damping current is 0, it indicates that the damping loop is open-circuited, the damping resistor may be burnt out, if the damping current is greater than 0 and not greater than 1A, the damping loop is normal, otherwise, if the damping current exceeds the range, it is determined that the damper capacitor has a fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111304308.1A CN114089018A (en) | 2021-11-05 | 2021-11-05 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111304308.1A CN114089018A (en) | 2021-11-05 | 2021-11-05 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
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| Publication Number | Publication Date |
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| CN114089018A true CN114089018A (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111304308.1A Pending CN114089018A (en) | 2021-11-05 | 2021-11-05 | Method for testing faults of electromagnetic units of capacitor voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487915A (en) * | 2022-04-18 | 2022-05-13 | 广东电网有限责任公司佛山供电局 | Method and system for detecting damper of capacitive voltage transformer |
Citations (4)
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| CN103884953A (en) * | 2014-03-07 | 2014-06-25 | 中国南方电网有限责任公司超高压输电公司广州局 | Damping loop fault diagnosis system of capacitor voltage transformer |
| CN203849352U (en) * | 2014-03-07 | 2014-09-24 | 中国南方电网有限责任公司超高压输电公司广州局 | Apparatus for diagnosing fault of damping loop of capacitor voltage transformer |
| CN106990380A (en) * | 2017-05-31 | 2017-07-28 | 国网河南省电力公司平顶山供电公司 | Live capacitance type potential transformer fault detection method |
| CN112731255A (en) * | 2020-12-11 | 2021-04-30 | 云南电网有限责任公司红河供电局 | System and method for detecting damping loop of capacitive voltage transformer |
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2021
- 2021-11-05 CN CN202111304308.1A patent/CN114089018A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884953A (en) * | 2014-03-07 | 2014-06-25 | 中国南方电网有限责任公司超高压输电公司广州局 | Damping loop fault diagnosis system of capacitor voltage transformer |
| CN203849352U (en) * | 2014-03-07 | 2014-09-24 | 中国南方电网有限责任公司超高压输电公司广州局 | Apparatus for diagnosing fault of damping loop of capacitor voltage transformer |
| CN106990380A (en) * | 2017-05-31 | 2017-07-28 | 国网河南省电力公司平顶山供电公司 | Live capacitance type potential transformer fault detection method |
| CN112731255A (en) * | 2020-12-11 | 2021-04-30 | 云南电网有限责任公司红河供电局 | System and method for detecting damping loop of capacitive voltage transformer |
Non-Patent Citations (1)
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| 张志东: "电容式电压互感器电磁单元故障检定方法", 《电力科学与工程》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114487915A (en) * | 2022-04-18 | 2022-05-13 | 广东电网有限责任公司佛山供电局 | Method and system for detecting damper of capacitive voltage transformer |
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