H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/24, 317/7
H02H 7/045 (2006.01) H02H 5/08 (2006.01) H02H 7/04 (2006.01)
Patent
CA 1249652
22 ABSTRACT OF THE DISCLOSURE Apparatus for the supervision of a sudden pres- sure relay (SPR) system which protects a power system network transformer having a plurality of windings associ- ated with each phase of the power system network is dis- closed. This apparatus overcomes the difficulties associated with previous overcurrent supervision of the SPR system for multiple-winding transformers. The apparatus utilizes a maximum restraint signal selection network which offers a discriminating differentiation between high and low current levels in all of the transformer windings and accomplishes this in one embodiment with a single measuring unit per phase of the power system network. For each phase, when the selected maximum restraint signal exceeds a predetermined level, the supervisory unit blocks the SPR from operating the breakers which isolate the power trans- former from the power system network. This blocking condition is relieved after a predetermined time period from when the selected restraint signal falls below the predetermined level. The apparatus is further capable of detecting both an internal fault condition and an inrush energization condition of the power transformer and for inhibiting the blockage of the SPR from operating the breakers during either of these detected conditions.
502652
Elmore Walter A.
Li Hung J.
Oldham And Company
Westinghouse Electric Corporation
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