Accession Number : AD0475133

Title :   INSTANTANEOUS OVERVOLTAGE PROTECTION FOR AIRCRAFT A.C. GENERATORS.

Descriptive Note : Technical rept.,

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

Personal Author(s) : McKenzie, R. L. A. ; Sims, R. F.

Report Date : JUL 1965

Pagination or Media Count : 18

Abstract : Overvoltage protection in current use on aircraft a.c. systems incorporates a substantial time delay to avoid unwanted tripping with transient voltage rises due to switching etc. Consequently, on the occurrence of a genuine fault, consuming equipment is subjected to an excessive voltage for a considerable time before the fault is cleared. By making overvoltage protection depend on the direction of the change of alternator excitation current as well as on the voltage level, overvoltage faults may be cleared with no deliberate time delay and with no danger of inadvertent operation due to load switching or fault clearance. The circuit and testing of such a form of overvoltage protection are described. (Author)

Descriptors :   (*GENERATORS, AIRBORNE), AIRCRAFT, ALTERNATING CURRENT, FAILURE, DELAY CIRCUITS, TESTS, VOLTAGE, VOLTAGE REGULATORS, GREAT BRITAIN.

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE