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Method for judging turn-to-turn insulation short circuit of electromagnetic voltage transformer

A technology of voltage transformer and turn-to-turn insulation, which is applied to the field of judging the short circuit of the turn-to-turn insulation of electromagnetic voltage transformers, can solve the problems of high use and maintenance costs, high cost and easy damage, etc., achieve accurate judgment, improve work efficiency, and facilitate Realized and practical effect

Active Publication Date: 2018-06-12
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above methods all need to be equipped with a large number of detection electronic components and intelligent processing modules, the cost is high and easy to be damaged, and the use and maintenance costs are relatively high, which is not conducive to quick and easy judgment under harsh or simple working conditions. Therefore, There is a need for a simple, convenient and easy-to-implement method for judging the inter-turn insulation short circuit of a voltage transformer

Method used

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  • Method for judging turn-to-turn insulation short circuit of electromagnetic voltage transformer
  • Method for judging turn-to-turn insulation short circuit of electromagnetic voltage transformer

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 , figure 2 As shown, judging by the common sense of the actual working conditions, taking the example that none of the three adjacent electromagnetic voltage transformers to be inspected is faulty or only one is faulty, the three voltage transformers are respectively defined as group A , Group B, and Group C, select 220V AC voltage regulator and 750V AC voltmeter, according to figure 1 Assemble the detection device for judging the inter-turn insulation short circuit of the electromagnetic voltage transformer. The specific judgment operation is divided into several situations:

[0031] Judgment 1: Connect the corresponding windings of the secondary sides of Group A and Group B in parallel, connect the AC ammeter in parallel between the high-voltage windings of Group A and Group B, and connect the secondary sides of Group A and Group B in parallel through the AC voltage regulator Slowly pressurize the terminal, and observe the voltage value of the AC a...

Embodiment 2

[0037] Judging according to the common sense of actual working conditions, taking the example that none of the three adjacent electromagnetic voltage transformers to be inspected is faulty or only one is faulty, the three voltage transformers are respectively defined as group A and group B , Group C, choose 220V AC voltage regulator and 750V AC voltmeter, different from Embodiment 1, in the wiring detection method of Embodiment 1, the situation of judging 2, 3, 4 is as follows:

[0038] Judgment 2: Connect the AC ammeter in parallel between the high-voltage windings of Group A and Group B, and slowly pressurize the parallel terminals of the secondary sides of Group A and Group B through the AC voltage regulator, and observe the voltage value of the AC ammeter; When the indication value increases significantly with the slow pressurization of the AC voltage regulator, and finally maintains a large indication value, it proves that there is an electromagnetic voltage transformer be...

Embodiment 3

[0042] The above embodiment mainly considers that none of the three adjacent electromagnetic voltage transformers has a fault or only one of them has a fault as an example, which can satisfy most of the fault situation judgments. When two or more electromagnetic voltage transformers appear When the transformer fails, it can be judged according to the following principle, that is, according to the method of embodiment 1, first pressurize and measure two adjacent electromagnetic voltage transformers. When the voltmeter indicates a large value, it means that there is an electromagnetic voltage transformer. If there is poor inter-turn insulation in the voltage regulator, it is necessary to reduce the voltage regulator to zero in time. Then repeat the above test with another unpressurized electromagnetic voltage transformer and any one of the overvoltage electromagnetic voltage transformers. When the measured voltage has two large values, it means that there is a problem with the v...

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Abstract

The invention provides a method for judging a turn-to-turn insulation short circuit of an electromagnetic voltage transformer. The method is applicable to an electromagnetic voltage transformer as single-phase usage or multi-single-phase electromagnetic voltage transformer combination for three-phase usage in a V-V shape. The method comprises the steps that voltage is applied to two adjacent electromagnetic voltage transformers, and measurement is performed, when a voltmeter indicates that the voltage is large, it illustrates that turn-to-turn insolation of one electromagnetic voltage transformer is poor and a voltage regulator needs to be adjusted to zero in time; the other electromagnetic voltage transformer to which no voltage is applied and any one electromagnetic voltage transformer to which voltage is applied are subjected to repeated experiments, and judgment is performed according to different conditions. Problems can be judged only through cooperation of simple components andsimple operation, use is easy, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power system safety protection methods, and in particular relates to a method for judging an insulation short circuit between turns of an electromagnetic voltage transformer. technical background [0002] At present, when the 10kV, 35kV, 110kV, and 220kV electromagnetic voltages have abnormal voltages, in order to ensure the safety of the power system and prevent accidents from expanding, the electromagnetic voltage transformers are generally taken out of operation and await inspection by professional testers. [0003] When the electromagnetic voltage transformer is operated for a long time, the temperature will naturally rise, and when the inter-turn insulation is poor, the insulation will also drop accordingly, forming an inter-turn short circuit, resulting in abnormal monitoring voltage. When the test personnel arrived at the work site for the test, the temperature of the electromagnetic voltage transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R35/02
CPCG01R31/72G01R35/02
Inventor 裴继东蒋延磊靳耀珂赵志南
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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