Automatic insulation test equipment for testing high voltage ele

Details Automatic insulation test equipment for testing high voltage ele Automatic insulation test equipment for testing high voltage ele

1994-08-16

1996-05-07

Regan, Maura K.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324772, G01R 3102

Patent

active

055149677

ABSTRACT:
Insulation test equipment for testing high voltage electrical equipment at rated voltage levels up to above 5 kV. A multistage rectifier-capacitor voltage multiplier ladder is used to boost the test voltage to the desired level, while keeping the current and load capacity to a safe, low level. If an appreciable amount of current is attempted to be drawn, such as might occur with accidental human contact, the rectifier--capacitor ladder breaks down to limit the voltage and current to safe levels. Two separate current limit resistors are provided for both outgoing and incoming voltages of the test equipment. One is installed in the test apparatus and the other is installed on the high voltage fuse at the contact point between the motor windings and the test lead. The voltages and insulation current generated by the test equipment are monitored indirectly through opto-coupler circuits to isolate and protect the monitoring circuits and the operator.

REFERENCES:
patent: 2881361 (1959-04-01), Wood
patent: 2999189 (1961-09-01), Gerrard
patent: 3141128 (1964-07-01), Behr
patent: 4338561 (1982-07-01), Zaengl et al.
patent: 4679111 (1987-07-01), Koch et al.
patent: 4709293 (1987-11-01), Gershen et al.
patent: 5172289 (1992-12-01), Zelm
patent: 5179490 (1993-01-01), Lawrence

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