Walter L Hinman

US Patent:

40539407, Oct 11, 1977

Filed:

Aug 20, 1976

Appl. No.:

5/716045

Inventors:

Walter L. Hinman - New Providence NJ
Russell W. Gonnam - Morris Plains NJ

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H02H 726
H02H 328

US Classification:

361 68

Abstract:

Phase comparison relaying apparatus wherein the keying threshold levels at the local and remote ends of a protected power line section are each offset by a different value from the effective zero axis of the current waveform. One of the keying threshold values is set at a magnitude which will cause a trip response in the presence of low or medium magnitudes of outfeed current. The other keying threshold level is set at a magnitude which will cause a trip response in the presence of maximum magnitudes of expected outfeed current. The upper and lower current margin threshold levels are set to appropriately reflect the keying threshold level with which they are respectively associated. In addition, the transmmitter having the higher keying threshold level is located at that end of the protected line section where outfeed is expected.

US Patent:

39860795, Oct 12, 1976

Filed:

Feb 7, 1975

Appl. No.:

5/548135

Inventors:

Walter L. Hinman - New Providence NJ
Russell W. Gonnam - Morris Plains NJ

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H02H 726
H02H 328

US Classification:

317 27R

Abstract:

A phase comparison relaying network wherein a transmitter keying threshold is set at a predetermined value of the current wave at the transmitter end which is offset from the effective zero axis of the current wave. This yields a signal which, when phase compared with the current wave at the receiver end of the protected line section, permits a tripping response in the presence of "outfeed" current at the "weak feed" end of the protected line section which might occur during an internal fault.

US Patent:

39834557, Sep 28, 1976

Filed:

Jan 15, 1975

Appl. No.:

5/541369

Inventors:

Walter L. Hinman - New Providence NJ

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H02H 726

US Classification:

317 27R

Abstract:

This disclosure relates to a segregated phase comparison relaying system which is of the type wherein the current at each end of each of the conductors of a protected section of a three-phase transmission network is phase compared over a communication network for determining whether the fault of the faulted conductor is located within or external to the protected section of the transmission network. Under certain conditions it is desirable to transmit a breaker opening signal from one end (transmitting end) of the protected section to the other end (receiving end) thereof to provide a direct transfer-trip at the receiving end in response to the detection at the transmitting end of a fault which might not cause the breaker at the receiving end to open when using the segregated phase comparing system. Such direct transfer-trip resulting faults may be caused by numerous fault conditions such as, for example, the partial faulting of a voltage changing power transformer located within the protected network section, or the failure of a breaker other than the breaker at the receiving end to open and interrupt the fault current. As disclosed herein the direct transfer-trip signal is transmitted from the transmitting end to the receiving end by altering the normal phase comparing transmission into a peculiar predetermined pattern.

US Patent:

49396170, Jul 3, 1990

Filed:

May 5, 1989

Appl. No.:

7/349330

Inventors:

Gary R. Hoffman - Setauket NY
Walter L. Hinman - New Providence NJ

Assignee:

Dowty RFL Industries Inc. - Boonton NJ

International Classification:

H02H 300

US Classification:

361 64

Abstract:

The invention is directed to an improved method and apparatus for monitoring the status of an AC electrical transmission line connected between first and second locations. In a disclosed embodiment of the method of the invention, first signal parameter values are generated, for the first location, by time integrating between zero-crossings of an AC signal parameter measured at the first location. Second signal parameter values are generated, for the second location, by time integrating between zero-crossings of the AC signal parameter measured at the second location. The second signal parameter values are transmitted to the first location. In a form of this embodiment, the second signal parameter values transmitted for each of the three phases are transmitted only for time periods between successive zero-crossings beginning with a zero-crossing of one sense (e. g. positive-going zero-crossings), and the second signal parameter value for the ground reference return is transmitted only for time periods between successive zero-crossings beginning with a zero-crossing of an opposite sense (e. g. negative-going zero-crossings) to said one sense.

US Patent:

40578410, Nov 8, 1977

Filed:

Aug 20, 1976

Appl. No.:

5/716048

Inventors:

Walter L. Hinman - New Providence NJ
Russell W. Gonnam - Morris Plains NJ

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H07H 328

US Classification:

361 64

Abstract:

Phase comparison relaying apparatus associated with the local and remote end terminals of a protected line section wherein the phase comparison is performed at one terminal by unsupervised circuitry to generate an echo trip signal which is employed to effect breaker tripping at the other terminal. Additional circuitry supervises the generation of a breaker trip signal for use at the terminal where the echo trip signal is generated without preventing generation and transmission of the echo trip signal. The use of such circuitry is described in the operating context of phase comparison relaying apparatus adapted to utilize offset keying. Also described is the effectiveness of such circuitry during open breaker or zero-feed conditions.