Title:
A ZERO-SEQUENCE CURRENT BRAKING METHOD FOR POWER TRANSFORMER DIFFERENTIAL PROTECTION
Document Type and Number:
WIPO Patent Application WO/2005/078886
Kind Code:
A1
Abstract:
The invention discloses a technical improved solution of transformer differential protection. A phase zero-sequence ratio braking unit is formed by using one phase differential current in transformer longitudinal differential protection and the zero-sequence current in Y 0 side of the transformer, the phase braking signal is outputted so that the corresponding phase ratio differential unit of transformer longitudinal differential protection is braked when the ratio value is less than the correcting value K. It can prevent the mal-operation of transformer longitudinal differential protection caused by ground fault outside the Y0 side region, while the normal operation of longitudinal differential protection in the region under the fault is not affected. It is suitable for the longitudinal differential protection of power transformer.
Inventors:
XU XIDONG (CN)
Application Number:
PCT/CN2005/000194
Publication Date:
August 25, 2005
Filing Date:
February 16, 2005
Export Citation:
Assignee:
UNIV ZHEJIANG (CN)
XU XIDONG (CN)
XU XIDONG (CN)
International Classes:
H02H7/045; (IPC1-7): H02H7/045
Foreign References:
| CN1402400A | 2003-03-12 | |||
| CN1419327A | 2003-05-21 | |||
| CN1402900A | 2003-03-12 | |||
| CN1047887A | 1990-12-19 |
Attorney, Agent or Firm:
ZHEJIANG HANGZHOU JINTONG PATENT AGENCY CO., LTD. (47 Huancheng North Road Hangzhou, Zhejiang 3, CN)
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