Title:
METHOD FOR DETECTING TRANSFORMER TAIL CURRENT
Document Type and Number:
WIPO Patent Application WO/2017/059655
Kind Code:
A1
Abstract:
A method for detecting a tail current of a transformer, (1) detecting monotonicity of a sample value; (2) if the sample value has a monotonic increasing/decreasing feature, and exceeds a time setting, then the sample current is determined as a tail current. The method for detecting the monotonicity of the sample value is: calculating the differences of a current sampling point and the previous N sampling points, if the differences are greater than zero, then the current sampling point has a monotonic increasing feature; on the contrary, if the differences are less than zero, then the current sampling point has a monotonic decreasing feature, 1
Inventors:
LIU DONGCHAO (CN)
LIU KUI (CN)
ZHAO QINGCHUN (CN)
ZHU XIAOTONG (CN)
LIU KUI (CN)
ZHAO QINGCHUN (CN)
ZHU XIAOTONG (CN)
Application Number:
PCT/CN2016/075774
Publication Date:
April 13, 2017
Filing Date:
March 07, 2016
Export Citation:
Assignee:
NR ELECTRIC CO LTD (CN)
NR ENGINEERING CO LTD (CN)
NR ENGINEERING CO LTD (CN)
International Classes:
G01R35/02; G01R19/00; H02H7/22
Foreign References:
| CN104134972A | 2014-11-05 | |||
| CA2630639A1 | 2007-05-31 | |||
| CN101201390A | 2008-06-18 | |||
| JPH03106116A | 1991-05-02 |
Other References:
GAO, PENG ET AL.: "Impact of Tail Current of CT on Breaker Failure Protection", GUANGDONG ELECTRIC POWER, vol. 25, no. 7, 31 July 2012 (2012-07-31)
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM (ORDINARY PARTNERSHIP) (CN)
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