Switchgear voltage sensor

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor

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Details

361 6, 361187, 324126, 324133, G01R 1504, G01R 500

Patent

active

042413737

ABSTRACT:
A switchgear assembly which includes a vacuum interrupter, a current transformer, and a capacitive voltage sensor, all embedded within a cast epoxy housing mounted to a solidly grounded support structure. The voltage sensor includes a first capacitor, which is formed by an interrupter conductor stud, a plate, and the cast epoxy disposed therebetween, and a second capacitor, which is connected between the plate and a metal tube extending outside the housing. The tube is connected to ground through a conductive coating, applied to the housing, having an impedance which is very low in comparison to the impedance of the first capacitor. The voltage signal on the plate, which is proportional to the stud voltage, is supplied through the center conductor of a coaxial lead to one input of a voltage level sensing circuit, where it is amplified, rectified, and compared with a reference voltage to produce a positive output signal whenever the stud voltage exceeds a first value, and thereafter produce a negative output signal whenever the stud voltage decreases to less than a second value lower than the first value. The conductive shield of the coaxial lead has a first end connected to the metal tube and a second end connected to the ground terminal of the voltage level sensing circuit and to ground through a ground path having a low impedance in comparison to the impedance of conductive coating ground path between the metal tube and the grounded support structure.

REFERENCES:
patent: 3001100 (1961-09-01), Schuh et al.
patent: 3524133 (1970-08-01), Arndt
patent: 3932810 (1976-01-01), Kohler et al.
patent: 3970932 (1976-07-01), Harvey
patent: 3991367 (1976-11-01), Chapman et al.
patent: 3999087 (1976-12-01), Compton
patent: 4052668 (1977-10-01), Schmitt et al.
patent: 4074193 (1978-02-01), Kohler
patent: 4121154 (1978-10-01), Keating
patent: 4124790 (1978-11-01), Kumbera et al.
Maddox, "High Input Impedance Capacitance Coupled Voltage Probes," Technical Digest, Western Electric, No. 45, Jan. 1977, pp. 27-29.
Fletcher, "Overvoltage Counter for Distribution Lines," Proc. IEE, vol. 124, No. 6, Jun. 1977, pp. 565-566.

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