Reclosing relay with nonvolatile memory of operations
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United States of America Patent
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-
Jul 4, 1989
Issued Date -
N/A
app pub date -
Nov 24, 1987
filing date -
Jul 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reclosing relay for use in an electrical power system with a circuit breaker for clearing line faults by tripping and reclosing. The breaker has auxiliary contacts defining the state of the circuit breaker as open or closed. The reclosing relay includes a circuit responsive to the auxiliary contacts for producing a first signal representative of the state of the breaker and another circuit for generating a second signal when a loss of power to the reclosing relay is anticipated. The reclosing relay further includes an electronic circuit connected to the first signal producing circuit and the second signal generating circuit for supplying a reclose command for the breaker when the breaker is open by executing one or more operations in a predetermined reclosing sequence, for storing information in response to the second signal identifying which operation in the reclosing sequence is currently being executed, and for using the stored information to continue from the identified operation in the reclosing sequence upon restoration of power. Other features of reclosing relays and methods of operating them are also disclosed.
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