Polarizing potential transfer switch circuit for use with power

Details Polarizing potential transfer switch circuit for use with power Polarizing potential transfer switch circuit for use with power

1991-07-29

1993-11-16

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307125, 361 86, H02B 124

Patent

active

052626792

ABSTRACT:
The polarizing potential transfer switch system takes advantage of an existing loss-of-potential (LOP) circuit (32) in a power transmission line protective system to differentiate between a trip signal produced by the distance elements in a protective relay (22) due to the operation of the transfer switch and a true fault condition. This is accomplished by a logic circuit (40) which includes a first timer (58) which permits the operator of the transfer switch (10) five seconds to complete the potential transfer operation between two buses (14 and 16) and a second timer (68) which gives the LOP circuit (32) a selected number of cycles in which to block a trip signal produced by the distance elements in the relay (22).

REFERENCES:
patent: 4234901 (1980-11-01), Strickland, Jr.
patent: 4745512 (1988-05-01), Hampson
patent: 4835651 (1989-05-01), Li et al.

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