Protective relaying system

Details Protective relaying system Protective relaying system

1982-09-29

1985-03-26

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

364482, H02H 326

Patent

active

045077002

ABSTRACT:
A protective relaying system is disclosed which detects a fault in an electric power system having a circuit breaker by using a current and a voltage of the electric power system. The protective relaying system includes an input conversion/unit adapted to receive a first and a second input signals corresponding to said current and voltage, for converting the magnitude and/or the phase of the first and second input signals to produce least two electrical quantities a first electrical quantity and a third electrical quantity, and for outputting the second input signal without conversion as a second electrical quantity.
The protective relaying system also includes a comparing unit connected to receive first, second and third electrical quantities from the input conversion unit for comparing the first and second electrical quantities to produce a first logical state and comparing the third and fourth electrical quantities to produce a second logical state signal cyclically. The protective relaying system further includes a digital data processing unit for judging whether a specified logical condition between the first and second logical state signals holds for a predetermined number of times corresponding to a predetermined electrical angle, and for producing a protection relay output signal based on the judging result. The protection relay output signal is adapted for using to trip the circuit breaker.

REFERENCES:
patent: 4148087 (1979-04-01), Phadke
patent: 4212046 (1980-07-01), Andow et al.
patent: 4276605 (1981-06-01), Okamoto et al.
patent: 4286303 (1981-08-01), Genheimer et al.
patent: 4319298 (1982-03-01), Davis et al.
patent: 4333151 (1982-06-01), Matsushima
patent: 4365302 (1982-12-01), Elms
patent: 4377833 (1983-03-01), Udren
patent: 4420805 (1983-12-01), Yamaura et al.

Affiliated with

Also associated with

Rating

Protective relaying system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Protective relaying system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective relaying system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1297118