Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas

A technology of on-load tapping and gas detection, which is applied in the detection field, can solve problems affecting power safety production, transformer operation status, and increased maintenance costs, so as to reduce unplanned power outages and limit load time, avoid misjudgment of accidents, The effect of reducing labor intensity and unsafe factors

Inactive Publication Date: 2009-05-20
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] However, some on-load tap-changers have defects in design, process, material, installation, maintenance, etc., which increase the probability of failure. Among them, the leakage of insulating oil in the tap-changer to the transformer body is common in many power departments. If it happens, it is easy to cause the false appearance of accidents such as internal discharge of the transformer, which brings a lot of trouble to the electric workers, seriously affects the correct judgment of the internal operation status of the transformer, and affects the normal power safety production
At present, the method of judging the internal leakage of the transformer is mainly to manually detect the leakage point after the power outage, which not only increases the number of unplanned power outages, but also increases the corresponding maintenance costs

Method used

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  • Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas
  • Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas
  • Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas

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Experimental program
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Effect test

Embodiment 1

[0100] Take 50 tons of transformer body oil and 500 kg of tap changer insulating oil as an example:

[0101] Step 1. Determine the SF to add to the on-load tap-changer 6 Gas volume:

[0102] According to SF 6 Gas stability detection solubility 20μL / L and adding SF to insulating oil 6 The maximum volume percentage of gas is 6%, and the SF in the insulating oil of the on-load tap-changer is calculated according to the following formula 6 Minimum and maximum volumes for gases:

[0103] V=(M 1 +M 2 )÷0.89×20×10 -6

[0104] =(50000+500)÷0.89×20×10 -6 =1.1(L)

[0105] V'=M 2 ÷0.89×6%=500÷0.89×6%=33.7(L)

[0106] In the formula: the minimum volume of V-SF6 gas added, the unit is L;

[0107] m 1 - is the oil weight of the transformer body, in Kg;

[0108] m 2 - is the weight of transformer on-load switch oil, in Kg;

[0109] V' - the maximum volume of SF6 gas added, unit L;

[0110] Due to the addition of a minimum volume of SF to the insulating oil of the on-load tap-c...

Embodiment 2

[0125] Choose 110kV to build a substation, the transformer model is: SFZLB-31500 / 110, and the production number is: 818L06-1. The transformer has been put into operation since 1983. During operation, it was found that the oil weight of the on-load tap-changer was 400kg, and it was suspected that the oil chamber of the on-load tap-changer leaked into the main body;

[0126] Step 1: Determine SF 6 The amount of gas added:

[0127] Volume of on-load tap-changer: 400×0.89=449L

[0128] Addition amount of SF6 gas: 449×6%=27L

[0129] Step 2: Inject 27L of SF into the on-load tap-changer oil 6 gas:

[0130] Choose SF with a purity of 99.99% 6 Gas and precision regulating valves are connected with stainless steel pipes, and one side is connected to SF 6 The output port of the pressure reducing valve is connected to the air release nozzle of the gas relay of the on-load tap-changer on one side. Adjust the precision needle valve so that the SF 6 The gas flow rate is controlled ...

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Abstract

The invention relates to a method for detecting leakage of insulating oil in an on-load tapping switch of a transformer by using SF6 gas, which comprises the following steps: firstly, calculating volume of the SF6 gas in the insulating oil added to the on-load tapping switch; adding the SF6 gas to the insulating oil for the on-load tapping switch according to a calculated value; selecting an oil sample of transformer body oil; and using a gas chromatograph to carry out chromatographic analysis for the selected oil sample of the transformer body oil. If the SF6 gas is detected out, which proves that the on-load tapping switch leaks the insulating oil; and if no SF6 gas is detected out, which proves that the on-load tapping switch does not leak the insulating oil. The method determines the problem of oil leakage of the on-load tapping switch by using an indirect method to avoid occurrence of misjudgment accidents, can judge failure property and approximate position inside equipment to provide reliable scientific basis for maintenance work, reduce unplanned power failure and limited loading time of a transformer, greatly reduce economic expenditure on manpower, physical resources and materials, and reduce labor intensity, insecurity factors and the like.

Description

technical field [0001] The invention relates to a detection method, especially a method using SF 6 Gas detection methods for transformer on-load tap-changer insulation oil leakage. Background technique [0002] Transformers are important equipment for voltage level regulation in power systems. With the development of the power industry, most of the power transformers above 35kV are equipped with on-load tap changers. Their actions are accurate and fast, and can reduce and stabilize voltage fluctuations. The load current can be distributed compulsorily, thus ensuring the safe and reliable operation of the power grid. [0003] However, some on-load tap-changers have defects in design, process, material, installation, maintenance, etc., which increase the probability of failure. Among them, the leakage of insulating oil in the tap-changer to the transformer body is common in many power departments. If it happens, it is easy to cause the false appearance of accidents such as i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02G01P5/00
Inventor 王俊良曾定文白慧芳王振方段利伟郑俊阳杨海峰牛宇干
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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