Microcomputer based reclosing relay
Patent 4994934 Issued on February 19, 1991. Estimated Expiration Date: 
December 1, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 1, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesTiming controller for a recloser relay Microprocessor based recloser control System for monitoring the operating condition of a switch to prevent overstress Recloser control with independent memory Tape player assembly having a capstan mounted on a pivotal plate Patent #: 4931890 InventorAssigneeApplicationNo. 444648 filed on 12/01/1989US Classes:361/71, Automatic reclosing361/75, With time delay before reclosing361/92, Undervoltage700/292System protection (e.g., circuit interrupter, circuit limiter, voltage suppressor)ExaminersPrimary: DeBoer, Todd E.Attorney, Agent or FirmInternational ClassH02H 007/22AbstractA microcomputer based reclosing relay performs a number of sequences to generate a succession of reclosure signals for a circuit breaker at timed intervals. The digital processing unit of the relay maintains flags, counts and running times for generating the succession of timed reclosures in a volatile memory. Periodically, these flags, counts and running times are copied to a non-volatile memory such as an EEPROM. Upon restoration of power following an interruption of power which results in loss of the contents of the volatile memory, the digital processing unit recopies the flags, counts and running times saved in the non-volatile memory back into the volatile memory, so that the relay can resume generating the succession of reclosures from the point at which power was lost. The flags and counts are copied to the EEPROM only when they change state, while the running times are only saved once a second to prolong the service life of the EEPROM. | |
