Apparatus for protecting vacuum interrupter type on-line tap cha

Details Apparatus for protecting vacuum interrupter type on-line tap cha Apparatus for protecting vacuum interrupter type on-line tap cha

1981-08-03

1983-06-14

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

323341, 361 5, H02P 1306

Patent

active

043886647

ABSTRACT:
An apparatus for protecting a vacuum interrupter type on-line tap changer in which a cross current flows between taps through a current limiting resistor for a predetermined time by shorting selected taps therebetween at the time of tap changing operations. Vacuum interrupters are employed as current switching elements. A dial switch selects the position of the tap of the tap changer. A limit switch closes only at a predetermined position of the dial switch during tap changing operations. Thus, a cross current between the taps or a load current flowing for a long time due to a drop in the degree of vacuum of the vacuum interrupters is detected, thereby preventing burn-out of the current limiting resistor and damage to contacts of a disconnecting switch due to interruption of the current.

REFERENCES:
patent: 3581188 (1971-05-01), Watanabe et al.
patent: 3602807 (1971-08-01), Prescott
patent: 3720867 (1973-03-01), Rathbun

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