Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1987-12-24
1989-03-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 91, 361 92, H02H 324
Patent
active
048149349
ABSTRACT:
A voltage fault detector (10) for producing a trip signal causing switching from a first AC voltage source (12) to a second AC voltage source (14) is disclosed. A plurality of comparators (18,20,22) monitor a signal which is proportional to the magnitude of the voltage of a first AC voltage source (12) to determine if sample values fall within predetermined ranges. A counter (30) counts the number of samples falling outside the predetermined range to generate the trip signal when the count reaches a predetermined limit. The counter (30) is augmented for each sample which is outside the predetermined range and decremented for each sample which is within the predetermined range. A plurality of latches (24,26,28) are respectively coupled to a different one of the comparators for applying the output level signal from one of the comparators to the counter at predetermined times under the control of clock signal pulse trains generated by a combinational logic circuit (32) which are respectively applied to a different one of the plurality of latches. The voltage fault detector (10) may be used to monitor the condition of one or more phases of a backup voltage source.
REFERENCES:
patent: 3337742 (1967-08-01), Baehr et al.
patent: 3505598 (1967-08-01), Merrill
patent: 4075502 (1978-02-01), Walley, Jr.
patent: 4087697 (1978-05-01), Johnson
patent: 4096395 (1978-06-01), Bogel et al.
patent: 4156280 (1979-05-01), Griess
patent: 4219858 (1980-08-01), DePuy et al.
patent: 4219860 (1980-08-01), DePuy
patent: 4231029 (1980-10-01), Johnston
patent: 4356553 (1982-10-01), Steinle et al.
patent: 4384213 (1983-05-01), Bogel
patent: 4405867 (1983-09-01), Moakler et al.
patent: 4423458 (1983-12-01), Stich
patent: 4446498 (1984-05-01), Stich
patent: 4475047 (1984-10-01), Ebert, Jr.
patent: 4520275 (1985-05-01), Marusik
patent: 4528458 (1985-07-01), Nelson et al.
patent: 4535409 (1985-08-01), Jindrick et al.
patent: 4540892 (1985-09-01), Carvalho
patent: 4583004 (1986-04-01), Yearsin
patent: 4605982 (1986-08-01), Harner et al.
patent: 4625283 (1986-11-01), Hurley
patent: 4628397 (1986-12-01), Gareis et al.
patent: 4638175 (1987-01-01), Bradford et al.
patent: 4677311 (1987-06-01), Morita
patent: 4685020 (1987-08-01), Driscoll et al.
patent: 4703191 (1987-10-01), Ferguson
patent: 4717984 (1988-01-01), Henry et al.
Danby Clive M.
Jones Gregory D.
Owens William R.
Thiel Clifford G.
Jennings Derek S.
Pellinen A. D.
Sundstrand Corp.
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