Voltage sensor for gas insulated electric apparatus

摘要

Disclosed is a voltage sensor for a gas insulated electrical apparatus which requires no grounding field and which provides high accuracy with a simple structure. The voltage sensor includes a capacitor type voltage divider having a floating electrode (5a,5b,5c) at a position opposed to a high-voltage conductor (3a,3b,3c) through an insulation sealing terminal (8a,8b,8c) mounted to a flange of a branch pipe (2a,2b,2c) provided on an inner surface of an annular grounding container (1) ; an ohm resistor (11a,11b,11c) for voltage division which has an impedance that is sufficiently smaller than the impedance between the floating electrode (5a,5b,5c) and the annular grounding container (1); and a converting portion (26a,26b,26c) which converts the detection voltage of the high-voltage conductor to a voltage value that allows processing on the secondary side.