On-line monitoring method for oil-immersed transformer

A technology for oil-immersed transformers and oil tanks, which is applied to transformer/inductor parts, instruments, measuring electricity, etc., can solve the problems of low accuracy and inaccurate measured temperature, and achieves improved accuracy and reduced occurrence The effect of reducing deviation and reducing judgment error

Active Publication Date: 2018-09-28
北京华电中试电力工程有限责任公司
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AI Technical Summary

Problems solved by technology

[0004] Generally, the temperature sensor is used to detect the oil temperature and the ambient temperature; however, in the prior art, there is one sensor for detecting the oil temperature and the ambient temperature, and these two temperature sensors are in fixed positions, sometimes the local oil temperature and the local ambient temperature will be higher or lower low, which is prone to inaccurate measured temperature, resulting in low accuracy in monitoring abnormal conditions of oil-immersed transformers

Method used

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Examples

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Embodiment Construction

[0027] An online monitoring method for an oil-immersed transformer, comprising the following steps:

[0028] (1) Monitor the temperature of the top layer of oil in the fuel tank: It is detected by the first temperature sensor in the fuel tank, and driven by the cylinder, the first temperature sensor moves back and forth horizontally, and the time for the piston rod of the cylinder to stretch once is N1 seconds; the first temperature The sensor outputs the detected first detection value every second;

[0029] (2) Monitoring the ambient temperature: It is detected by the second temperature sensor near the oil-immersed transformer, and driven by the motor, the second temperature sensor rotates around the output shaft of the motor, and the time for the output shaft of the motor to rotate one circle is N2 seconds, N2= N1=N; the second temperature sensor outputs the detected second detection value every second;

[0030] (3) Processing module: the processing module communicates with...

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PUM

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Abstract

The invention relates to the technical field of on-line monitoring of power transformers, and discloses an on-line monitoring method for an oil-immersed transformer. The technical solution thereof comprises the following steps that: (1) a temperature sensor on the top of the oil-immersed transformer detects the temperature of the top oil in the oil tank; (2) the temperature sensor near the oil-immersed transformer detects the ambient temperature; (3) the temperature value of the top oil measured by the temperature sensor per second is compared with the flash point of the transformer oil; the ambient temperature value per second is compared with the preset maximum allowable temperature value; and the top oil temperature value per second is subtracted from the ambient temperature value per second; and (4) the alarm device alarms when receiving an abnormal signal. The method has the effect of improving the accuracy of monitoring the abnormal condition of the oil immersed transformer.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of power transformers, in particular to an on-line monitoring method of an oil-immersed transformer. Background technique [0002] The oil temperature of oil-immersed power transformer is directly related to the service life of oil-immersed power transformer and the operation safety of power transmission and transformation system, so it is necessary to monitor the temperature of oil-immersed power transformer oil. By monitoring and analyzing the temperature of the transformer oil and the ambient temperature, it can be judged whether the temperature of the transformer oil is normal, and then it can be concluded whether the working state of the transformer is abnormal. [0003] When abnormal conditions such as abnormal operation of the radiator, partial short circuit of the iron core, and partial inter-turn short circuit of the winding occur in the oil-immersed transformer, the oil temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/40G01R31/00
CPCG01R31/00H01F27/402H01F2027/404
Inventor 李玉彬
Owner 北京华电中试电力工程有限责任公司
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