Title:
非接地の直流電力供給システムのための地絡保護リレーシステムおよびその制御方法
Document Type and Number:
Japanese Patent JP2008504795
Kind Code:
A
Abstract:
The present invention provides a ground protection relay device, in which a current limiting means having different resistance characteristics according to voltage differences between both ends thereof is constructed in a ground protection relay, and particularly placed between the negative bus of a rectifier and the ground. Therefore, in a normal operating state, the current limiting means exhibits high resistance characteristics, thus limiting a leakage current to a reference level or less, while, at the time of a ground fault, the current limiting means exhibits small resistance characteristics, thus enabling a ground fault current having sufficient value for measurement to flow through the current limiting means. Further, the present invention provides a ground protection relay system and method of controlling the same, which determines the occurrence of a ground fault by measuring the value of ground fault current flowing through the current limiting means, and determines a faulty feeder by comparing variations in currents flowing through feeders with variation in ground fault current for the same period of time.
Inventors:
Chun Sang-Gi
Han Suk-Yen
Jeon Rag-Gyo
Kim Young-Sue
Han Suk-Yen
Jeon Rag-Gyo
Kim Young-Sue
Application Number:
JP2007517939A
Publication Date:
February 14, 2008
Filing Date:
December 21, 2004
Export Citation:
Assignee:
Korea Railroad Research Institute
International Classes:
H02H7/26; H02H3/16
Domestic Patent References:
| JPH02311123A | 1990-12-26 | |||
| JPH08205377A | 1996-08-09 | |||
| JP2003134657A | 2003-05-09 | |||
| JP2008502291A | 2008-01-24 | |||
| JPS5713924A | 1982-01-25 | |||
| JPS60160328A | 1985-08-21 | |||
| JP2003032882A | 2003-01-31 | |||
| JPH07227036A | 1995-08-22 |
Attorney, Agent or Firm:
Yoshiki Ishida