| 摘要 |
PCT No. PCT/FR80/00007 Sec. 371 Date: Sep. 23, 1980 Sec. 102e Date: Sep. 19, 1980 PCT Filed: Jan. 23, 1980 Pub. No. WO80/01516 Pub. Date: Jul. 24, 1980. The present invention refers to capacitive voltage transformers. In accordance with one embodiment a capacitive voltage transformer has two capacitors connected in series between a point on a high voltage line and a reference point such as earth and two impedances connected in series with the two capacitors. A medium voltage electromagnetic detector is connected between the common point of the two capacitors and the common point of the two impedances. An electronic voltage detector is connected to the terminals of the series circuit formed by the two impedances, the values of the latter being selected in order that the instantaneous voltage at the terminals of the electronic detector is always a constant fraction of the voltage taken off between the line and the reference point. Application to the operation of highspeed static protections from a capacitive voltage transformer having a medium voltage electromagnetic circuit. |
