Capacitive voltage transformer for a metal-enclosed, gas-filled

Details Capacitive voltage transformer for a metal-enclosed, gas-filled Capacitive voltage transformer for a metal-enclosed, gas-filled

1998-03-17

1999-11-23

Wong, Peter S.

Electric power conversion systems

Current conversion

With voltage division by storage type impedance

361287, 361305, H02M 306, H01G 500, H01G 4008

Patent

active

059911778

ABSTRACT:
The capacitive voltage transformer is provided for a metal-enclosed, gas-filled high-voltage system. It has a cylindrical capacitor having two coaxially arranged, electrically conducting cylinders (12, 13), of which one internally arranged cylinder (12) is at a high voltage potential and outwardly bounds a current-carrying conductor (5) of the system. An externally arranged one of the two cylinders (13) is inserted in an electrically insulated fashion into the metal enclosure (4). In a first embodiment of the voltage transformer the internal cylinder (12) has an enclosing tube (16) formed from a material having a lower coefficient of linear thermal expansion than copper. In a second embodiment there is provided, for the purpose of correcting the transformed voltage values, a device which detects the value of the current carried in the conductor (5), and in which the change in the capacitance of the cylindrical capacitor is determined as a function of a change in temperature caused by the current carried in the conductor (5). The accuracy of the transformed voltage values is increased by both embodiments.

REFERENCES:
patent: 3646412 (1972-02-01), Boersma et al.
patent: 4320337 (1982-03-01), Hartmann et al.
patent: 4591783 (1986-05-01), Mastner
patent: 4772983 (1988-09-01), Kerber et al.
patent: 5272460 (1993-12-01), Baumgartner et al.
patent: 5432438 (1995-07-01), Baumgartner et al.
patent: 5444599 (1995-08-01), Dupraz et al.

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