Method and apparatus for detecting the rate of rise of direct cu

Details Method and apparatus for detecting the rate of rise of direct cu Method and apparatus for detecting the rate of rise of direct cu

1985-05-17

1987-11-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

307353, 307517, 324 51, 361 5, 361 63, H02H 332

Patent

active

047077611

ABSTRACT:
A low level fault condition in a mine trolley system is distinguished from a normal system load by detection circuitry connected to the trolley system between a main circuit breaker and the trolley wire. The detection circuitry monitors the current through the trolley wire and samples the current at preselected intervals of time to detect a rise in current through the trolley wire. The rate of current rise is compared to an adjustable reference signal. If the current rise exceeds a preselected rate, then activation circuitry of the main circuit breaker is latched to determine if the net current change is above a preset limit. If other available protective devices, such as fuses, in the trolley system fail to isolate the faulted circuitry within a preselected period of time after an excessive current rise is detected, then the activation circuitry is tripped to open the normally closed contacts of the main circuit breaker. In this manner the entire flow of current through the trolley wire is interrupted.

REFERENCES:
patent: 2928997 (1960-03-01), Edmunds
patent: 4295099 (1981-10-01), Evans
patent: 4344037 (1982-08-01), Ragsdale
patent: 4410817 (1983-10-01), Chi et al.
patent: 4439803 (1984-03-01), Baba
patent: 4455509 (1984-06-01), Crum et al.
patent: 4634895 (1987-01-01), Luong

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