Induction voltage divider based method for judging detection error exception of voltage transformer

A technology of inductive voltage divider and voltage transformer, which is applied in the direction of instruments, measuring electric variables, measuring devices, etc., can solve the problems of voltage transformer verification error, standard voltage transformer out-of-tolerance, voltage transformer out-of-tolerance, etc., to achieve The effect of high accuracy level, low cost and small size

Inactive Publication Date: 2011-02-09
ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO +1
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Problems solved by technology

[0003] The object of the present invention is, in order to solve the problem of the abnormality of the field verification error of the voltage transformer, how to judge the problem of whether the verified voltage transfor

Method used

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  • Induction voltage divider based method for judging detection error exception of voltage transformer
  • Induction voltage divider based method for judging detection error exception of voltage transformer
  • Induction voltage divider based method for judging detection error exception of voltage transformer

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] Step 1: On the basis of the original wiring, first compare the standard voltage transformer and the induction voltage divider by ( figure 2 )or( image 3 ) connection mode access;

[0049] The second step: calculate the value of the voltage division coefficient K, and set it in the induction voltage divider;

[0050] (1) Suppose the rated primary voltage U of the tested product (when U>35kV):

[0051] K=NkV / U=35kV / U

[0052] When U=220kV, K=0.159;

[0053] When U=110kV, K=0.318;

[0054] (2) Suppose the rated primary voltage U of the tested product (when U<35kV):

[0055] K=U / NkV=U / 35kV

[0056] When U=10kV, K=0.286;

[0057] The third step: calculate the test voltage U t the percentage value of;

[0058] (1) Suppose the rated primary voltage U of the tested product (when U>NkV):

[0059] When U=220kV, U t =NkV / U×100%=35 / 220×100%=15.9%;

[0060]W...

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Abstract

The invention relates to an induction voltage divider based method for judging detection error exception of a voltage transformer. According to a transformer error theory and an induction voltage divider theory, the method cascades an induction voltage divider and a standard voltage transformer to form a comparison standard voltage transformer in any transformation ratio for respectively comparing the errors of a voltage transformer to be tested and the standard voltage transformer so as to accurately judge exceptional error reasons occurring in the on-site detection process of the voltage transformer. The invention has the advantages of high accuracy grade, small size, portability, convenient judgment method, strong operability, low cost, high efficiency, scientific and accurate conclusion, and the like and is suitable for judging and processing the error exception in the detection process of the voltage transformer on site or in a laboratory.

Description

technical field [0001] The invention relates to a method for judging the abnormal situation of the verification error of a voltage transformer based on an induction voltage divider, and belongs to the technical field of verification of voltage transformers for electric power metering. Background technique [0002] The voltage transformer is installed in a power plant or a substation, and the field verification of the voltage transformer often has abnormal verification errors, because the field situation is complex and changeable. The on-site verification of voltage transformers must be carried out when the equipment is powered off. Due to the particularity of power production related to the national economy and people's livelihood, there are very limited power outages. Therefore, the on-site verification of power equipment has a time limit. The verification equipment is cumbersome and bulky, and usually needs to be transported to the test site by car for a long distance. Whe...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 靳绍平李欣聂方明李东江
Owner ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO
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