Zone protective directional relay scheme

Details Zone protective directional relay scheme Zone protective directional relay scheme

1985-10-15

1987-08-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 68, 361 81, 361 82, 361 84, H02H 728

Patent

active

046897089

ABSTRACT:
A protective system for protecting elements (for example D) of an electric power system allocates a protection zone to each element. The protection zones are defined by switching points (for example 19', . . . , 24') which isolate the associated element (for example D) from the power system. Each of these switching points is associated with a transmitter/actuator unit (for example 19, . . . , 24). The transmitter/actuator units (for example 19, . . . , 24) produce "open" commands for their associated switching points (for example 19', . . . , 24') if it is determined that a fault has occurred inside the associated protection zone. The "open" commands for the switching points (for example 19', . . . , 24') are formed locally within the vicinity of each of the switching points. This is realized by the transmitter/actuator units (for example 22) which contain two evaluating units (for example 22D, 22L8) which are respectively allocated to different protection zones, and in that all evaluating units allocated to one protection zone (for example 19D, . . . , 24D) communicate with each other via local data links (N) and remote data links (F).

REFERENCES:
patent: 4538195 (1985-08-01), Elmore
patent: 4538196 (1985-08-01), Sun

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