Title:
METHOD FOR AUTOMATICALLY ADJUSTING MALFUNCTION PROTECTION DELAY BY MEANS OF TAIL CURRENT IDENTIFICATION
Document Type and Number:
WIPO Patent Application WO/2021/047568
Kind Code:
A1
Abstract:
Disclosed is a method for restraining a tail current and preventing malfunction protection maloperation. A fault current is processed by means of a differential filtering algorithm to acquire first current data; the fault current is processed by means of a full-cycle Fourier algorithm to acquire second current data; the first current data is processed by means of half-wave integration to acquire third current data; and whether the third current data and the second current data both satisfy a malfunction action threshold is determined, and if the two both satisfy the malfunction action threshold, a malfunction protection action is started. The present invention is suitable for a scenario in which a relay protection secondary current transformer has a "tail current" after a short-circuit fault occurs in a power system, the effect of the tail current can be effectively reduced, and malfunction protection maloperation can be prevented.
Inventors:
ZHENG YUPING (CN)
WU TONGHUA (CN)
YU HONG (CN)
WANG XIAOHONG (CN)
DAI WEI (CN)
YAO GANG (CN)
WU TONGHUA (CN)
YU HONG (CN)
WANG XIAOHONG (CN)
DAI WEI (CN)
YAO GANG (CN)
Application Number:
PCT/CN2020/114354
Publication Date:
March 18, 2021
Filing Date:
September 10, 2020
Export Citation:
Assignee:
NARI TECHNOLOGY CO LTD (CN)
NARI NANJING CONTROL SYSTEM CO LTD (CN)
STATE GRID CORP CHINA (CN)
STATE GRID CHONGQING ELECTRIC POWER CO (CN)
NARI GROUP CORCOPRATION LTD (CN)
NARI NANJING CONTROL SYSTEM CO LTD (CN)
STATE GRID CORP CHINA (CN)
STATE GRID CHONGQING ELECTRIC POWER CO (CN)
NARI GROUP CORCOPRATION LTD (CN)
International Classes:
H02H7/22; G01R19/165
Foreign References:
| CN106451369A | 2017-02-22 | |||
| CN105914714A | 2016-08-31 | |||
| US5419197A | 1995-05-30 | |||
| CN110768218A | 2020-02-07 |
Other References:
YUE YU, YARONG GUO, YANJUN LI, YONG LI, YU LIU, RONGRONG ZHAN: "Research on Delay Optimization of Breaker Failure Protection Based on the CT Current Tail Truncation Algorithm", POWER SYSTEM TECHNOLOGY, vol. 41, no. 1, 1 January 2017 (2017-01-01), pages 285 - 290, XP055791475, ISSN: 1000-3673, DOI: 10.13335/j.1000-3673.pst.2016.0601
Attorney, Agent or Firm:
NANJING ZONGHENG INTELLECTUAL PROPERTY AGENT CO., LTD. (CN)
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