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Title:
METHOD FOR CALCULATING MINIMUM SWITCHING TIME OF CLOSING RESISTOR OF HIGH-CAPACITY MAIN TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/2015/101327
Kind Code:
A1
Abstract:
A method for calculating the minimum switching time of a closing resistor of a high-capacity main transformer. The method comprises the following steps: (1) calculating the time t1 when a magnetizing inrush current of the first closed phase produces the maximum value after being switched on; (2) calculating the lag time t2 when a magnetizing inrush current of the second closed phase produces the maximum value; and (3) calculating the minimum switching time tall, where tall = t1 + t2. By means of the method, the magnetizing inrush current of the main transformer can be suppressed under the conditions of high capacity and high remanence, thereby reducing the harmonic overvoltage risks of the weak-tie power grid that has the characteristics of long distance and small load.

Inventors:
WEI, Wei (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
DING, Lijie (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
ZHANG, Hua (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
TANG, Fan (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
TENG, Yufei (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
LI, Gan (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
Application Number:
CN2014/095863
Publication Date:
July 09, 2015
Filing Date:
December 31, 2014
Export Citation:
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Assignee:
STATE GRID CORPORATION OF CHINA (No. 86 West Chang'an Avenue, Xicheng, Beijing 1, 100031, CN)
ELECTRIC POWER RESEARCH INSTITUTE OF SICHUAN (No. 24, Qinghua Road Qingyan, Chengdu Sichuan 0, 610000, CN)
International Classes:
H02H9/02
Foreign References:
CN103730889A2014-04-16
CN202094605U2011-12-28
SU1270829A11986-11-15
Other References:
PENG, JINGPING ET AL.: "A New Restraint Technique of Transformer Inrush Current", JOURNAL OF HOHAI UNIVERSITY CHANGZHOU, vol. 21, no. 4, 31 December 2007 (2007-12-31), pages 67 AND - 74
HAO, ZHIGU O ET AL.: "Study on Inrush Current Restraining Technology when Energizing No-load Transformer", HIGH VOLTAGE APPARATUS, vol. 41, no. 2, 30 April 2005 (2005-04-30), pages 81 - 82
LI, PING ET AL.: "Research of Restraining of Transformer Excitation Inrush Current Based on Improved Series Closing Resistance", INDUSTRY AND MINE AUTOMATION, vol. 39, no. 4, 30 April 2013 (2013-04-30), pages 67
Attorney, Agent or Firm:
CHENGDU XINGZHI PATENT AGENCY (ORDINARY PARTNERSHIP) (He Xiaomao, B-1002´╝îCATIC International Plaza88th Jiaozi Avenue, Gaoxi, Chengdu Sichuan 0, 610000, CN)
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