Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1974-10-09
1976-07-06
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324127, G01R 1900, G01R 122
Patent
active
039684326
ABSTRACT:
In an alternating current electric power system subject to rapid load voltage regulation as a result of variations in reactive load current, reactive load current compensation is provided by fixed capacitors and inductors in parallel with the load, the inductors being in series with static switches which are phase controlled to continuously maintain the net reactive compensating current substantially equal and opposite to the reactive component of load current. Compensation control determines firing time of the static switches in accordance with the magnitude of reactive load current and regulating means additionally controls firing time to maintain line current and voltage at a selected line location substantially in phase coincidence. A reactive load current sensor and a current angle sensor each utilize a signal voltage representative in phase and magnitude of line-to-neutral voltage at a high voltage "critical bus" location but derived from line-to-line voltage and line current at a remote low voltage system location.
REFERENCES:
patent: 3090006 (1963-05-01), Lenehan
General Electric Company
Haubner J. Wesley
Karlsen Ernest F.
Rolinec R. V.
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