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Winding temperature measuring method of oil-immersed power transformer

A power transformer and winding temperature technology, applied in thermometers, measuring devices, measuring heat, etc., can solve problems such as incorrect winding temperature measurement, save economic costs and maintenance costs, avoid inaccurate measurements, and improve operation and maintenance levels Effect

Inactive Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for measuring the winding temperature of an oil-immersed power transformer, so as to solve the problem in the prior art that the winding temperature measurement based on the thermal simulation experiment is incorrect due to defects.

Method used

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  • Winding temperature measuring method of oil-immersed power transformer
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  • Winding temperature measuring method of oil-immersed power transformer

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Embodiment Construction

[0023] Such as figure 2 , follow the steps below to complete the winding temperature test:

[0024] Step 1: According to the rated capacity S of the transformer to be tested, the rated voltage U and the rated current ratio N of the current transformer, calculate the rated secondary current I of the transformer to be tested under the rated load p , Among them, the rated capacity S, the rated voltage U and the rated current ratio N of the current transformer are fixed parameters of the transformer to be tested, which can be obtained from the nameplate of the transformer.

[0025] Step 2: According to the copper oil temperature difference △T of the transformer to be tested under the rated load, query the thermal simulation characteristics-temperature rise and current correspondence table, and obtain the rated heating current I s ; Among them, the copper oil temperature difference △T is a fixed parameter of the transformer to be tested, which can be obtained from the nameplate...

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Abstract

The invention relates to a winding temperature measuring method of an oil-immersed power transformer. A thermal simulation experiment principle is utilized, actual heating current is obtained after the steps of acquiring related parameters of the transformer, inquiring a thermal simulation features-temperature rise and current mapping table, computing and the like, actual copper oil temperature difference is obtained according to an actual heating current lock-up table, and top oil level temperature is superposed to obtain the winding temperature. The method has the advantages that a winding temperature meter used by the transformer in field can be replaced completely, and economic cost and maintenance cost for purchasing the winding temperature meter are saved greatly; the effect as same as that of measurement by the winding temperature meter can be achieved, and the temperature of a transformer winding can be uploaded to a monitoring data network accurately and inerrably; the problem of inaccuracy of winding temperature measurement caused by influences of the environmental temperature or self defects of the winding temperature meter can be solved completely, and operation and maintenance level of a transformer substation can be increased.

Description

technical field [0001] The invention relates to the technical field of power system measurement, in particular to a method for measuring the winding temperature of an oil-immersed power transformer. Background technique [0002] At present, most substations at home and abroad use the method of winding thermometer thermal simulation experiment to indirectly measure the winding temperature of oil-immersed transformers. Such as figure 1 As shown, the thermal simulation experiment is that the secondary current Ip output by the current transformer 1 is adjusted by the matching device 2, and the heating current Is that is proportional to the load is output, and flows through the heating element 3 embedded in the winding thermometer. The heat causes additional expansion of the temperature-sensing medium, thereby causing additional displacement of the elastic element, which drives the pointer to rotate to indicate the winding temperature. [0003] However, in actual use, it is fou...

Claims

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Application Information

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IPC IPC(8): G01K7/00
Inventor 刘彦琴刘翔宇王华唐广瑜肖勇张华强杨红权胡琳胡祥胜
Owner STATE GRID CORP OF CHINA
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