Protective relaying system

Details Protective relaying system Protective relaying system

H - Electricity

02

H

354/222, 348/24

H02H 3/28 (2006.01) H02H 1/00 (2006.01) H02H 3/05 (2006.01) H02H 3/30 (2006.01) H02H 7/26 (2006.01)

Patent

CA 1108765

PROTECTIVE RELAYING SYSTEM ABSTRACT OF THE DISCLOSURE In a protective system which operates in response to a plurality of state quantities, for example voltage and current, one of which being a digital code signal having a long code length and transmitted over a trans- mission circuit, the density of the code errors of the digital code signal is detected. A plurality of state quantities are processed by a processor including first means responsive to the digital code signal and second means not responsive to the digital code signal. Either one of the first and second means is selected according to the density of the code errors. According to this invention it is possible to operate the relaying system at high speed and high accuracy without being affected by code errors produced during the transmission thereof and without the necessity of using any locking means. By using the detected code errors the relay can operate either a differential relay or a distance relay.

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