Static relays permit enhanced protection

Author

Bailey, Bruce ; Jakominich, Dan

Author_Institution

Siemens Power Transmission & Distribution, Raleigh, NC, USA

Volume

5

Issue

2

fYear

1999

Firstpage

10

Lastpage

17

Abstract

Multi-function multi-phase static overcurrent relays, using digital technology available today, provide basic time, (51) (51G) (51N) and instantaneous (50) (50G) (50N) three phase and ground overcurrent protection, and may offer some or all of the following additional functions: undervoltage (27); overvoltage (59); reverse phase sequence (47); negative phase sequence voltage (47N); directional overcurrent (67) (67N); frequency (81O/U); reverse interlocking trip coil monitoring; and battery monitoring. This article describes two applications that use some of the additional functions in such a relay: reverse interlocking, also using the directional overcurrent (67) function; and ground fault detection for systems utilizing high resistance grounding. The first application was installed on a 4160 volt power system which was supplied by two 5000 kVA transformers

Keywords

earthing; fault location; overcurrent protection; power system protection; relay protection; 4160 V; battery monitoring; digital technology; directional overcurrent; enhanced protection; frequency; ground fault detection; ground overcurrent protection; high resistance grounding; multi-function multi-phase static overcurrent relays; negative phase sequence voltage; overvoltage; power system; reverse interlocking; reverse interlocking trip coil monitoring; reverse phase sequence; static relays; three phase overcurrent protection; transformers; undervoltage; Batteries; Coils; Digital relays; Electrical fault detection; Frequency; Monitoring; Power system relaying; Protection; Protective relaying; Voltage control;

fLanguage

English

Journal_Title

Industry Applications Magazine, IEEE

Publisher

ieee

ISSN

1077-2618

Type

jour

DOI

10.1109/2943.750387

Filename

750387