Method for judging abnormity of balance winding of large transformer

A technology for balancing windings and transformers, which is applied in transformer testing, electrical winding testing, multi-phase network asymmetry reduction, etc. It can solve problems such as complex operations, and achieve the effects of simple test methods, reduced manpower, and fewer test instruments

Pending Publication Date: 2022-08-05
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the invention is complex in operation and cannot quickly and timely judge the abnormality of the balance winding of a large transformer

Method used

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  • Method for judging abnormity of balance winding of large transformer
  • Method for judging abnormity of balance winding of large transformer
  • Method for judging abnormity of balance winding of large transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 Show, a method to judge the abnormal winding winding of large transformers, including the following steps:

[0033] S1: Apply a symmetrical 380V AC voltage to the normal running transformer high -voltage side, and measure the voltage at both ends of the balance winding. It is used as the initial value u 0 It

[0034] S2: When the failure needs to be judged, 380V AC voltage is applied to the high -voltage side of the transformer, and the voltage at both ends of the balancing winding opening is measured. 1 It

[0035] S3: According to the measured voltage u 1 Test with the initial test U 0 Compare whether the balance winding is abnormal.

[0036] In S1, the three -phase voltage U AB0 U BC0 U CA0 Symmetry ≤ ± 2 %.

[0037] In S2, the voltage method of the measurement of the balancing winding opening is::

[0038] (1) Remove the high -voltage side, mid -voltage side, and low -voltage side lead of the transformer, and the balance winding opens open;

[0039] (2) A ...

Embodiment 2

[0045] like figure 1 Show, a method to judge the abnormal winding winding of large transformers, including the following steps:

[0046] S1: Apply a symmetrical 380V AC voltage to the normal running transformer high -voltage side, and measure the voltage at both ends of the balance winding. It is used as the initial value u 0 ; AB0 U BC0 U CA0 Symmetry ≤ ± 2 %.

[0047] S2: When the failure needs to be judged, 380V AC voltage is applied to the high -voltage side of the transformer, and the voltage at both ends of the balancing winding opening is measured. 1 ; The method of measuring the voltage at both ends of the balancing winding opening is:

[0048] (1) Remove the high -voltage side, mid -voltage side, and low -voltage side lead of the transformer, and the balance winding opens open;

[0049] (2) A 380V AC voltage is applied to the three phases of the transformer high -voltage side A, B, and C. AB1 U BC1 U CA1 When the voltage symmetry ≤ ± 2 %, the voltage meter measured the vo...

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PUM

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Abstract

The invention discloses a method for judging abnormity of a balance winding of a large transformer, and belongs to the technical field of transformer abnormity diagnosis. The method comprises the following steps: applying symmetrical 380V alternating-current voltage to three phases of a high-voltage side of a normally operating transformer, measuring voltage at two ends of a balance winding, and taking the voltage as an initial value U0; when a fault needs to be judged, applying 380V alternating-current voltage to the high-voltage side of the transformer, and measuring the voltage U1 at the two ends of the opening of the balance winding; and comparing the measured voltage U1 with an initial test value U0 to judge whether the balance winding is abnormal or not. The test method is simple, the number of test instruments is small, manpower is greatly reduced, and abnormity of the balance winding of the large transformer can be rapidly and accurately judged.

Description

Technical field [0001] The invention involves the field of abnormal diagnostic technology in transformer, which is specifically a method to judge large transformer balance winding abnormalities. Background technique [0002] The transformer is one of the most commonly used devices in the power system. Because it is large, expensive and long -term loaded, the current flowing through the winding is large, coupled with environmental pollution, various overvoltage, etc., it is easy to produce it. Various defects, if you do not get accurate judgment and timely treatment, will cause great losses. After the failure, according to the requirements of the regulations, the test of large transformer balance winding tests, including winding DC resistance, insulation resistance, medium loss factor, and electricity capacity. If the transformer balances winding, there is a slight short circuit between turbine and layers. Even if the DC resistance is qualified, the potential failure already exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/72G01R31/62
CPCG01R31/72G01R31/62Y02E40/50
Inventor 裴继东银高胜曹心怡何晨飞梁璐王锦博王辛辛董晓晨李茜王鹏飞李闯王佳佳李鹏远
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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