Apparatus for automatic relay system testing

Claim 2

Apparatus for automatic-testing of a protective relaying system having first and second directional comparison relay circuits interconnected and being in combination with transfer trip transmitter and receiver interconnection in parallel with the relay circuit interconnection, said transmitter normally transmitting a first frequency guard signal and being controllable to transmit a second frequency trip signal indicative of a pre-set condition, said apparatus comprising: first means receiving test sequence energization and thereafter generating a series of test actuations; second means connected to be energized by a selected one of said test actuations to control said transfer trip transmitter to transmit said trip signal; and third means responsive to said transfer trip receiver upon receiving said second frequency trip signal to cause characteristic energization of said relay circuit interconnection to indicate at said first means the reception of said trip frequency signal by said receiver.

Claim 3

Apparatus as set forth in claim 1 wherein said first means comprises: program switch means which is periodically energized to effect a plurality of said test initiation actuations in a pre-set sequence.

Claim 4

Apparatus as set forth in claim 2 wherein said program switch means comprises: motor means energizable to provide constant rotational output; plural actuation means each receiving said rotational output; and plural switch means positioned adjacent each of said plural actuation means to be actuated thereby in accordance with pre-set program sequence.

Claim 5

Apparatus as set forth in claim 1 wherein said second means comprises: receive relay means energized in response to presence of said characteristic energization of said relay circuit interconnection to enable said first means test initiation actuation to key said transfer trip transmitter to the trip transmission.

Claim 6

Apparatus as set forth in claim 4 which is further characterized to include: switch means actuated by said receive relay means energization to operate a trip key input to said transfer trip transmitter.

Claim 7

Apparatus as set forth in claim 1 wherein said third means includes: remote program switch means energized to generate a series of second test actuations in synchronism with said first means test actuations.

Claim 8

Apparatus as set forth in claim 6 wherein said remote program switch means comprises: motor means energizable to provide constant rotational output; plural actuation means each receiving said rotatIonal output; and plural switch means positioned adjacent each of said plural actuation means to be actuated thereby in accordance with pre-set program sequence.

Claim 9

Apparatus as set forth in claim 6 which is further characterized to include: guard relay means energized upon guard frequency signal being received at said transfer trip receiver to enable said characteristic energization of said relay circuit interconnection as effected by a pre-set one of said second test actuations.

Claim 10

Apparatus as set forth in claim 8 wherein: said relay circuit interconnection consists of a transmitter and receiver interconnected for two-way carrier communication.

Claim 11

Apparatus as set forth in claim 8 wherein said second means comprises: receive relay means energized in response to presence of said characteristic energization of said relay circuit interconnection to enable said first means test initiation actuation to key said transfer trip transmitter to the trip transmission.

Claim 12

Apparatus for automatic testing of protective relay systems of the scheme where two-way directional comparison circuitry operating between first and second positions functions in parallel with first and second transfer trip channels transmitting either guard or trip signal in each direction between said first and second positions, the apparatus comprising: first program means located at said first position and providing a series of first test actuations after initial energization; second program means located at said second position and providing a series of second test actuations after initial energization; first and second guard relay means located at respective first and second positions and each being enabled upon receipt of guard signal to provide respective first and second guard outputs during a selected one of respective first and second test actuations; first and second circuit means located at respective first and second locations, each receiving said first and second guard outputs to cause respective bi-directional characteristic indication transmission by said directional comparison circuitry; first and second relay means located at respective first and second locations, each being responsive to reception of characteristic indication on said directional comparison circuitry to generate respective first and second trip outputs; and first and second test actuation means each conducting respective first and second trip outputs when actuated closed by respective first and second program means to key trip signal transmission of a respective transfer trip channel.

Claim 13

Apparatus for automatic testing of protective relay systems of the scheme where two-way directional comparison circuitry operating between first and second positions functions in parallel with first and second transfer trip channels transmitting either guard or trip signal in each direction between said first and second positions, the apparatus comprising: first program means located at said first position and providing a series of first test actuations after initial energization; second program means located at said second position and providing a series of second test actuations after initial energization; first and second guard relay means located at respective first and second positions and each being enabled upon receipt of guard signal to provide respective first and second guard outputs during a selected one of respective first and second test actuations; first and second circuit means located at respective first and second locations, each receiving said first and second guard outputs to cause respective bi-directional characteristic indication transmission by said directional comparison circuitry; first and second relay means located at respective first and second locations, each being responsive to reception of characteristic indication on said directional comparison circuitry to generate respective first and second trip outputs; and first and second test actuation means each conducting respective first and second trip outputs when actuated closed by respective first and second program means to key trip signal transmission of a respective transfer trip channel.

Claim 14

Apparatus as set forth in claim 11 wherein each of said first and second program means comprises: motor means energizable to provide constant rotational output; plural actuation means each receiving said rotational output; and plural switch means positioned adjacent each of said plural actuation means to be actuated thereby in accordance with pre-set program sequence.

Claim 15

Apparatus as set forth in claim 11 wherein: said two-way directional comparison circuitry consists of a transmitter and receiver interconnected for two-way carrier communication.

Claim 16

Apparatus as set forth in claim 11 which is further characterized to include: additional transfer trip communication channel interconnected in parallel with said two-way directional comparison circuitry and functioning in combination therewith to transmit either guard or trip signals in each direction between said first and second positions; third and fourth guard relay means located at respective first and second positions and each being enabled upon receipt of guard signal transmitted by said additional transfer trip channel to provide respective third and fourth guard outputs during a selected one of respective first and second test actuations; third and fourth circuit means located at respective first and second locations, each receiving said third and fourth guard outputs to cause respective bi-directional characteristic indication transmission by said directional comparison circuitry; third and fourth relay means located at respective first and second locations, each being responsive to reception of characteristic indication on said directional comparison circuitry to generate respective third and fourth trip command outputs to conduct during selected test actuations of said first and second program means to key trip signal transmission of a respective additional transfer trip channel.