A reliable digital directional relay based on compensated voltage comparison for EHV transmission lines

Author

Xia, Y.Q. ; He, J.L. ; Li, K.K.

Author_Institution

Dept. of Electr. Eng., Hong Kong Polytech., Hong Kong

Volume

7

Issue

4

fYear

1992

fDate

10/1/1992 12:00:00 AM

Firstpage

1955

Lastpage

1962

Abstract

A digital directional relay based on compensated voltage comparison has been implemented with a 16 bit microcontroller. The authors describe the digital implementation of the phase-angle comparators which make use of fundamental frequency components of the compensated voltages. A simple hybrid hardware structure and intelligent software routines have been developed to ensure high reliability. Using an adaptive sampling interval, the relay can maintain its overall performance even for faults that occur during power frequency disturbances. Dynamic tests on a 500 kV, 290 km transmission line analog model confirmed that the relay can provide correct operation for various faults during different operating conditions of the protected line

Keywords

compensation; microcontrollers; power system protection; power transmission lines; relay protection; 16 bit microcontroller; 290 km; 500 kV; EHV transmission lines; adaptive sampling interval; compensated voltage comparison; digital directional relay; dynamic tests; intelligent software; phase-angle comparators; power frequency disturbances; Digital relays; Frequency; Hardware; Intelligent structures; Maintenance; Microcontrollers; Protective relaying; Sampling methods; Testing; Voltage;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.156999

Filename

156999