Large power transformer application field capacity verification method

A technology for power transformers and verification methods, which is applied in the direction of measuring electrical variables, instruments, and measuring electricity, and can solve the problems of lack of large-scale power transformer capacity verification methods

Inactive Publication Date: 2015-07-29
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] The present invention solves the problem of lack of large-scale power transformer capacity verification method at present, and provides a large-scale power transformer application site capacity verification method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The on-site capacity verification method for large-scale power transformers is realized by the following steps:

[0017] 1) Measure the oil temperature t on the upper layer of the transformer and the ambient temperature, and adjust the transformer to the rated split;

[0018] 2) Test the DC resistance R, and convert it to the value at 75°C, R 75 =(235+75) / (235+t)×R;

[0019] 3) Calculate the rated current of each side according to the transformer capacity on the nameplate and the voltage level of each side;

[0020] 4) Measure no-load loss and no-load current;

[0021] 5) Compare the no-load loss obtained by measurement with the no-load loss of the corresponding transformer model in GB / T6451-2008 “Technical parameters and requirements for three-phase oil-immersed power transformers”. If the measured no-load loss is greater than the national standard, the capacity is insufficient; If the measured no-load loss is less than the national standard, proceed to the next ste...

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Abstract

The invention relates to a power transformer capacity verification method, particularly relates to a large power transformer application field capacity verification method, and solves a problem of lacking the large power transformer capacity verification method at present. The technical scheme is that transformer capacity is estimated by applying the corresponding relation of transformer model numbers and no-load loss numerical values specified in the GB/T6451-2008 "three-phase oil immersed power transformer technical parameters and requirements"; and transformer capacity is verified by no-load current, and finally transformer capacity is proved by comparison of calculation of the sum of DC resistance loss and no-load loss at temperature of 75 DEG C and load loss. The GB50150 "electrical equipment handover testing standard" is supplemented and improved by the method, and vulnerability in large transformer capacity management is compensated.

Description

technical field [0001] The invention relates to a method for verifying the capacity of a power transformer, in particular to a method for verifying the field capacity of a large-scale power transformer. Background technique [0002] There is a difference between the capacity marked on the nameplate of a large power transformer and its actual capacity. Therefore, its capacity needs to be verified at the application site before official use. There is no corresponding verification method in GB50150 "Electrical Equipment Handover Test Standard". Therefore, there is a lack of standardized power transformer capacity verification or verification methods in work practice. Contents of the invention [0003] The invention solves the problem of lack of a large-scale power transformer capacity verification method at present, and provides a large-scale power transformer application site capacity verification method. [0004] The present invention is realized by adopting the following ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 王建伟张学东包同刚刘玲雷丽萍于强孙凯姚永林史海青胡德恩
Owner STATE GRID CORP OF CHINA
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