Protective grounding and referencing arrangement for high voltag

Details Protective grounding and referencing arrangement for high voltag Protective grounding and referencing arrangement for high voltag

1987-12-14

1989-11-21

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 48, 361 50, 363 35, 363 52, H02H 904

Patent

active

048826464

ABSTRACT:
A protective grounding and referencing arrangement for a high-voltage, high-energy bulk supply is provided in the present invention. Isolation from ground is provided through the use of an isolation transformer connected between the a-c utility supply and the rectifiers which are provided for conversion to d-c. The d-c bus and its energy storage capacitors are then referenced to ground by a high resistance divider network. In such an arrangement the likelihood of an insulation breakdown to ground is significantly reduced. More importantly, in the event that such a breakdown should occur from one or the other terminal of the d-c bus the fault currents that result are limited by the referencing arrangement to a safe level. The energy hazard is thus very significantly reduced for the equipment.

REFERENCES:
patent: 4551780 (1985-11-01), Canay
patent: 4573098 (1986-02-01), Williston
patent: 4709164 (1987-11-01), Giesl

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