Phase discriminator circuit

Details Phase discriminator circuit Phase discriminator circuit

1981-08-18

1984-01-24

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328155, 307510, H03K 906, H03K 513, H03K 522

Patent

active

044279477

ABSTRACT:
An integrating phase discriminator circuit has an integration circuit including an operational amplifier to integrate bidirectional rectangular waveforms originating from those portions of two AC inputs having the same polarity. When an integrated value reaches an operating detecting level V.sub.D11 of a level detector when said level is equal to an integrated value V.sub.H for a phase difference of 90.degree. between the two inputs, an inoperative signal from the level detector changes to an operating signal. This causes an R-C differentiation circuit to apply a position pulse to the operational amplifier to forcibly raise the integrated value of its upper limit E.sub.P while a control circuit changes V.sub.D11 to a reset detecting level V.sub.D22 =E.sub.P -V.sub.H in the level detector, resulting in the continuous delivery of the operating signal. When the integrated value decreases to V.sub.D22, the level detector delivers the inoperative signal. The differentiation circuit then generates a negative pulse for forcibly lowering the integrated value to its lower limit of 0 through an operational amplifier. The level detector continuously delivers the inoperative signal while it has the detecting level changed from V.sub.D22 to V.sub.D11 by the control circuit.

REFERENCES:
patent: 3743951 (1973-07-01), Carroll
patent: 4053940 (1977-10-01), Hinman, Jr. et al.
patent: 4225795 (1980-09-01), Keeney
patent: 4306297 (1981-12-01), Sugihara et al.
patent: 4371974 (1983-02-01), Dugan
The General Electric Company, Ltd., Instruction and Maintenance Manual: Distance Protection Relay.
A. R. van C. Warrington, Protective Relays: Their Theory and Practice (vol. Two).

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