Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1976-03-22
1977-12-13
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 91, 361104, 363 56, 363159, H02H 7122
Patent
active
040633020
ABSTRACT:
A protection arrangement for an inverter having fuses connected in series with its d-c inputs is disclosed. In particular, in one form of the arrangement, an electronic voltage monitoring device is provided for monitoring the input d-c voltage to the inverter at the connection points of the inverter inputs and the fuses. If the voltage monitored by the monitoring device falls below a predetermined level, the monitoring device delivers a protection signal to the control unit of the inverter directing the latter to release firing pulses for extinguishing the valves in the valves branches of the inverter.
In another form of the arrangement, the voltage monitoring device monitors the voltage across each of the fuses at the d-c inputs of the inverter, and, if a monitored voltage exceeds a predetermined value, delivers a protection signal to the control unit of the inverter.
Additionally, where the inverter being protected is included in a cycloconverter, provision is made for ensuring that a protection signal is not delivered before sufficient time has elapsed for the intermediate d-c link voltage of the converter to reach a predetermined value.
REFERENCES:
patent: 3394299 (1968-07-01), Lawn et al.
patent: 3530360 (1970-09-01), Relation
patent: 3546692 (1970-12-01), Salzer
patent: 3852656 (1974-12-01), Bourbeau
patent: 3890562 (1975-06-01), West
patent: 3947748 (1976-03-01), Klein
Donig Gerhard
Muller Manfred
Miller J D
Salce Patrick R.
Siemens Aktiengesellschaft
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