Title:
ZERO-SEQUENCE RESISTIVE CURRENT DIFFERENTIAL PROTECTION METHOD FOR INTER-STATION TIE LINE OF SMALL-RESISTANCE GROUNDING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/021515
Kind Code:
A1
Abstract:
The present application discloses a zero-sequence resistive current differential protection method for an inter-station tie line of a small-resistance grounding system, comprising the following steps: 1) collecting a three-phase current (A) of a three-phase current transformer at a transmitting end of a tie line and a zero-sequence voltage (B) of a power station bus at the transmitting end of the tie line, and collecting a three-phase current (C) of a three-phase current transformer at a receiving end of the tie line and a zero-sequence voltage (D) of the power station bus at the receiving end of the tie line; 2) calculating a zero-sequence resistive current (G) at the transmitting end of the tie line according to (E) and (F); 3) calculating a zero-sequence resistive current (J) at the receiving end of the tie line according to (H) and (I); 4) calculating a zero-sequence resistive differential current (M) and a braking current (N) according to (K) and (L); and 5) in the case of (O) or (P), performing a zero-sequence differential protection action.
Inventors:
HE XINLIN (CN)
WU HAO (CN)
LI YI (CN)
GUO LIN (CN)
YANG ZHILONG (CN)
WANG CHUANGBO (CN)
LIU XUHUI (CN)
LI CHUNLI (CN)
LEI YANG (CN)
ZHANG PENG (CN)
FANG ZICHAO (CN)
NI JIWEN (CN)
WU HAO (CN)
LI YI (CN)
GUO LIN (CN)
YANG ZHILONG (CN)
WANG CHUANGBO (CN)
LIU XUHUI (CN)
LI CHUNLI (CN)
LEI YANG (CN)
ZHANG PENG (CN)
FANG ZICHAO (CN)
NI JIWEN (CN)
Application Number:
PCT/CN2022/142779
Publication Date:
February 01, 2024
Filing Date:
December 28, 2022
Export Citation:
Assignee:
XIAN THERMAL POWER RES INST CO (CN)
International Classes:
H02H7/26; G01R31/08
Foreign References:
| CN115224676A | 2022-10-21 | |||
| CN107317312A | 2017-11-03 | |||
| CN108776284A | 2018-11-09 | |||
| CN112436492A | 2021-03-02 | |||
| CN113241739A | 2021-08-10 | |||
| US20190137556A1 | 2019-05-09 |
Attorney, Agent or Firm:
SUNSHINE INTELLECTUAL PROPERTY INTERNATIONAL CO., LTD. (CN)
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