System for detecting and limiting electrical ground faults withi

Details System for detecting and limiting electrical ground faults withi System for detecting and limiting electrical ground faults withi

1989-03-09

1990-08-14

Wasil, Daniel

Induced nuclear reactions: processes, systems, and elements

Testing, sensing, measuring, or detecting a fission reactor...

By particular instrumentation circuitry

361 48, 376277, G21C 1700

Patent

active

049493620

ABSTRACT:
An electrical ground fault detection and limitation system for employment with a nuclear reactor utilizing a liquid metal coolant. Elongate electromagnetic pumps submerged within the liquid metal coolant and electrical support equipment experiencing an insulation breakdown occasion the development of electrical ground fault current. Without some form of detection and control, these currents may build to damaging power levels to expose the pump drive components to liquid metal coolant such as sodium with resultant undesirable secondary effects. Such electrical ground fault currents are detected and controlled through the employment of an isolated power input to the pumps and with the use of a ground fault control conductor providing a direct return path from the affected components to the power source. By incorporating a resistance arrangement with the ground fault control conductor, the amount of fault current permitted to flow may be regulated to the extent that the reactor may remain in operation until maintenance may be performed, notwithstanding the existence of the fault. Monitors such as synchronous demodulators may be employed to identify and evaluate fault currents for each phase of a polyphase power, and control input to the submerged pump and associated support equipment.

REFERENCES:
patent: 3492533 (1970-01-01), Thurston
patent: 3928975 (1975-12-01), Braytenbah
patent: 4021700 (1977-05-01), Ellis-Anwyl
patent: 4434390 (1984-02-01), Elms

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