Failure detection circuit for dynamic braking system

Electricity: motive power systems – Braking – Dynamic braking

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Details

340648, 361 33, 361 86, 361 89, H02H 304, H02H 308, H02H 312

Patent

active

042030587

ABSTRACT:
A diesel electric locomotive has a dynamic braking system including a plurality of traction motors connected across dynamic braking grids. Air blowers for cooling the grids have motors which are connected across the grids. The failure of any motor is detected by monitoring the voltage across the motor with respect to a reference potential. The reference potential is developed in a bridge arrangement wherein the bridge imbalance is detected by a current sensor or by a reference potential generated in another motor circuit where another current sensor is used to detect a variance from the reference value. A circuit responsive to failure signals but voltage isolated from the traction motor circuits actuates an indicator as well as a relay for diminishing or terminating the dynamic braking function.

REFERENCES:
patent: 3660813 (1972-04-01), Rumpf
patent: 4048664 (1977-09-01), Kirilloff

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