Characteristic timer for a protective relay

Details Characteristic timer for a protective relay Characteristic timer for a protective relay

1982-04-19

1983-12-13

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361 85, 328111, 307234, 307592, H02H 3093

Patent

active

044207891

ABSTRACT:
A characteristic timer for a protective relay utilized as part of a system that provides protection for a portion of a high voltage transmission line is disclosed. The characteristic timer provides a time-base for measuring the duration of a signal developed by the protective relay indicative of a normal or an abnormal condition related to the protective portion of the high voltage transmission line. The characteristic timer is comprised of digital devices, such as; programmable counters for preselecting the frequency related limits to which the developed signal is compared, counters that monitor the duration and presence of the developed signal, and a shift register that controls the resetting of the characteristic timer. If the developed signal is disrupted for a predetermined time the shift register resets the digital devices and awaits for the reoccurrence of the developed signal for a revised determination of its time duration. Conversely, if the disruption is less than the predetermined time the shift register allows the timer to continue its monitoring of the status signal to determine its frequency related duration. The characteristic timer also has means for enhancing the resetting time of the protective relay.

REFERENCES:
patent: 4180842 (1979-12-01), Keeney
patent: 4191847 (1980-03-01), Mayer
patent: 4219860 (1980-08-01), DePuy
patent: 4271449 (1981-06-01), Grogan

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