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Transformer oil paper insulation state testing device and control method based on return voltage method

A technology of recovery voltage and state testing, applied in the direction of testing dielectric strength, etc., can solve the problems of large error, complicated operation, unsuitable for on-site use, etc., achieve high accuracy, broad application prospects, and easy operation

Inactive Publication Date: 2013-04-24
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can reflect the aging state of transformer oil-paper insulation to a certain extent, but generally take paper samples through the hanging core, which is not only complicated to operate, has large errors, but also is destructive, so it is not suitable for on-site use

Method used

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  • Transformer oil paper insulation state testing device and control method based on return voltage method
  • Transformer oil paper insulation state testing device and control method based on return voltage method
  • Transformer oil paper insulation state testing device and control method based on return voltage method

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Experimental program
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Effect test

Embodiment 1

[0035] A transformer factory used the present invention to test a transformer with a capacity of 150MVA that was put into operation in 1987 before (test product 1) and after transformation (test product 2). Set the test voltage U c =2000V, charging time T c =500s, the charging and discharging time is longer than T c / T d =2. The test results are shown in Table 1.

[0036] Table 1 Test results

[0037]

[0038] Note: U rmax — Maximum recovery voltage, unit: V

[0039] S i — The initial slope of the recovery voltage, unit: V / s

[0040] t cdom — central time constant, unit: s

Embodiment 2

[0042] A residential area implemented a power distribution equipment renovation project, shut down and dismantled 2 transformers, both with a capacity of 630kVA, put into operation in 1987 and 2001, and numbered 1# and 2# respectively. The two transformers are tested respectively by using the present invention. Set charging time U c =1000V, charging time T c =200s, the charging and discharging time is longer than T c / T d =2. The test results are shown in Table 2.

[0043] Table 2 Test results

[0044] Transformer number

u rmax (V)

S i (V / s)

t cdom (s)

Insulation state

1#

34.6

37.8

12.4

Insulation aging is serious

2#

9.3

12.5

38.1

Good insulation performance

[0045] From the test results in Table 1, it can be seen that the U rmax and S i Greater than sample 2, t cdom smaller than sample 2.

[0046] The test results show that: the insulation effect of sample 1 is very poor, and the...

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Abstract

The invention discloses a transformer oil paper insulation state testing device and a control method based on a return voltage method, and relates to the technical field of power sector transformer maintenance. The transformer oil paper insulation state testing device comprises a testing device control unit 1, a high-voltage direct current power module 4, a switch module 5, and a return voltage collecting unit 6. The testing device control unit 1 is connected with the switch module 5 and the return voltage collecting unit 6 through universal serial bus (USB) 2.0 connectors. One end of the high-voltage direct current power module 4 is connected with a low-voltage winding of a tested transformer through a relay S1 of the switch module 5, and the other end of the high-voltage direct current power module 4 is connected with a high-voltage winding of the tested transformer. One end of the return voltage collecting unit 6 is connected with a relay S3 of the switch module 5, and the other end of the return voltage collecting unit 6 is connected with the high-voltage winding of the tested transformer. The testing device control unit 1 achieves that a high-voltage direct current voltage is applied between any two sides of a high-voltage side, a middle-voltage side and a low-voltage side of the transformer by controlling the on-off of the relay S1, S2 and S3 of the switch module. Return voltage signal acquisition is achieved. The technical problems that an original transformer oil paper insulation state needs to be diagnosed by suspended core taking paper pattern, operation is complex, and error is great are solved.

Description

technical field [0001] The invention relates to the technical field of transformer maintenance in the electric power industry, in particular to a transformer oil paper insulation state testing device and a control method based on a recovery voltage method. Background technique [0002] The large oil-immersed power transformer is the core of the power system. During long-term operation, especially under harsh conditions, the electrical and mechanical life of the transformer will drop sharply. If the insulation fault of the transformer is not found in time, it will not only affect the safe operation of the entire substation, but also cause a large-scale power outage, which will bring serious economic losses and even threaten personal safety. [0003] Traditional methods for diagnosing transformer oil-paper insulation state mainly include Dissolved Gas-in-oil Analysis (DGA, Dissolved Gas-in-oil Analysis), furfural content analysis in oil, and insulation paper polymerization deg...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 彭倩高波姚晓王晓剑甘德刚李先浪刘凡吴广宁周利军陈凌曹晓斌
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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