Resistor grid protector

Details Resistor grid protector Resistor grid protector

1977-11-09

1979-09-25

Rubinson, Gene Z.

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318139, 318484, 318516, H02P 104

Patent

active

041692420

ABSTRACT:
Apparatus for preventing damage to resistor grids in the propulsion controller circuit of a direct current motor, particularly of the type used in driving railway vehicles, in which a line breaker relay is de-energized whenever the propulsion controller fails to progress from the switch position to the full series position within 15-25 seconds. The line breaker relay remains de-energized for the duration of the power cycle of the propulsion controller and becomes operational automatically after the master control handle is returned to the off position.

REFERENCES:
patent: 1431948 (1922-10-01), Hallock
patent: 4044288 (1977-08-01), Godfrey

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