A digital distance relay using negative sequence current

Author

Ohura, Y. ; Matsuda, T. ; Suzuki, M. ; Andow, F. ; Kurosawa, Y. ; Takeuchi, A.

Author_Institution

Tokyo Electr. Power Co. Inc., Japan

Volume

5

Issue

1

fYear

1990

fDate

1/1/1990 12:00:00 AM

Firstpage

79

Lastpage

84

Abstract

The configuration and performance of a recently developed digital distance relay using negative sequence current for remote backup protection are described. Since relays for remote backup protection are designed for remote faults, the fault current that is input to the relay is small due to the influence of current distribution factors. This in turn makes the relay sensitive to the effects of load current. In order to resolve this problem, a distance relay using negative-sequence current has been developed and put into use. The characteristics of this relay are: (1) the effects of load current are reduced, so the relay rarely maloperated due to load current during a fault; and (2) the hardware configuration of a digital relay that performs calculation on a negative component is simple and thus relatively error-free

Keywords

fault currents; relay protection; current distribution factors; digital distance relay; fault current; load current; negative sequence current; remote backup protection; Circuit faults; Current measurement; Digital relays; Impedance measurement; Phase measurement; Power system protection; Power system relaying; Protective relaying; Size measurement; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.107259

Filename

107259