Protective relaying apparatus of the unblock type

Details Protective relaying apparatus of the unblock type Protective relaying apparatus of the unblock type

H - Electricity

02

H

348/28

H02H 7/26 (2006.01)

Patent

CA 1053359

PROTECTIVE RELAYING APPARATUS OF THE UNBLOCK TYPE ABSTRACT OF THE DISCLOSURE Protective relaying apparatus for power trans- mission lines of the unblocking type which utilizes a fault signal from a remote portion of the protected line to initiate a normal transient blocking timer which in the absence of a local fault signal (within its timing period) will initiate a desensitizing operation and pre- vent the tripping of the local breaker due to the presence of transient and an additional timer arranged to be ener- gized in response to a local fault signal and effective when timed out to initiate the normal transient blocking timer in the absence of the remote fault signal. In a modified form of the apparatus, the concurrent reception of the received and local signals (indicative of a fault in the line section protected thereby) deactivates the normal timer and prevents its further timing operation to increase the margin of coordination when transient blocking should not occur.

283282

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