Apparatus for reducing stresses that initiate restrike of breake

Details Apparatus for reducing stresses that initiate restrike of breake Apparatus for reducing stresses that initiate restrike of breake

1988-01-11

1988-10-25

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

With operation facilitating feature

307135, 361 5, 361 13, 361 43, H02H 722

Patent

active

047806222

ABSTRACT:
Re-strike in the circuit breaker of a capacitive load applied across an AC voltage power supply is reduced or avoided by connecting across the capacitor bank a tuned discharge circuit. The tuned discharge circuit includes a transformer with a primary connected in parallel with the capacitor bank and a secondary which can be shorted through a switch. The leakage reactance of the transformer is equated to the capacitive reactance of the capacitor bank so that the tuned circuit discharges the capacitor voltage in phase with the supply voltage. The discharge takes place through a number of cycles thus gradually increasing the voltage across the breaker gap. The switch in the secondary preferably comprises an anti-parallel pair of thyristors fired by a circuit responsive to current zero in the capacitive circuit detected over a delay period to avoid firing at normal zero crossing current.

REFERENCES:
patent: 3532900 (1970-10-01), Rhyne, Jr.
patent: 3955134 (1967-05-01), Woodford
patent: 4056836 (1977-11-01), Knauer
patent: 4405965 (1983-09-01), Weldon et al.
patent: 4464696 (1984-08-01), Masui et al.
patent: 4485422 (1984-11-01), Takanashi
patent: 4550356 (1985-10-01), Takahashi
patent: 4555658 (1985-11-01), Hausler et al.
patent: 4618905 (1986-10-01), Tokuyama et al.
patent: 4636708 (1987-01-01), Whyte
patent: 4670810 (1987-06-01), Valeur

Affiliated with

Also associated with

Rating

Apparatus for reducing stresses that initiate restrike of breake does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for reducing stresses that initiate restrike of breake, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for reducing stresses that initiate restrike of breake will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2270830