Microprocessor based motor protective relay with maximum number

Details Microprocessor based motor protective relay with maximum number Microprocessor based motor protective relay with maximum number

1987-03-31

1987-12-15

Scott, J. R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 24, 318473, 318101, H02H 504

Patent

active

047137185

ABSTRACT:
A motor protection relay is provided which is programmable to limit the number of starts which are allowed in a given interval of time. In accordance with the algorithm associated with the relay microprocessor for controlling the starts per time, old starts which no longer fall within the same time constraint set by the operator or user are discarded and the time constraint is updated according to the next oldest start time.

REFERENCES:
patent: 3387182 (1968-06-01), Fourr
patent: 3875463 (1975-04-01), Reuter et al.
patent: 3875487 (1975-04-01), White
patent: 4042966 (1977-08-01), Newell et al.
patent: 4044288 (1977-08-01), Godfrey
patent: 4079432 (1978-03-01), Godfrey
patent: 4434390 (1984-02-01), Elms
patent: 4476423 (1984-10-01), Mallick, Jr. et al.
patent: 4494162 (1985-01-01), Eyler
"IQ-2000.TM. Model B Motor Command System User's Manual", Apr. 1985, relevant material may be found on any page.

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