Comparison and calibration of two kinds of transformer differential protection

Huadian Technology ›› 2011, Vol. 33 ›› Issue (10): 51-53.

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Comparison and calibration of two kinds of transformer differential protection

GE Xiaojun

Shentou Second Power Plant, State Grid Energy Development Corporation Limited, Shuozhou 036011, China

Received:1900-01-01 Revised:1900-01-01 Online:2011-10-25 Published:2011-10-25

Abstract

Abstract: The transformer microcomputer differential protection is very different from the conventional differential protection in their principle and the device structure. And the microcomputer differential protection devices, which are manufactured by different companies, are different from each other; so they must be treated earnestly and respectively in field calibration. The difference of protective principle between the two devices, which are the RCS978, manufactured by Nanjing Nanrui Relay Protection Company Limited, and the CSC326, the product of Beijing Sifang Relay Protection and Automation Company Limited, was compared. Based on this, taking the Y0/Y0/D11 threewinding transformer as example, the calibration step and calibration method of differential protection were introduced.

Key words: transformer, differential protection, calibration

GE Xiaojun. Comparison and calibration of two kinds of transformer differential protection[J]. Huadian Technology, 2011, 33(10): 51-53.

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