The Emergency source of electrical power in any fighter aircraft is the Battery. Most of the fighter aircraft are using Nickel-Cadmium battery as the Emergency source due to its good electrical characteristics. The only disadvantage of the Nickel-Cadmium battery is the thermal run away when the battery is kept in float charge. Thermal run-away is a condition in which the battery temperature raises due to chemical reaction and this raise in temperature accelerates the chemical reaction. This cumulative action will lead to immense rise in battery temperature that may prove to be catastrophic if appropriate action is not taken within stipulated time. Even though the occurrence of thermal rutvaway is very rare, in the event of occurrence of such an event it can lead to fire and explosions. For these reasons Ni-Cd batteries are to be equipped with temperature sensors and temperature warning systems. Battery Thermal runaway isolator is a Line Replaceable Unit (LRU) designed for charging/discharging, monitoring/protection of Nickel-Cadmium Battery on LCA. Any aircraft which wants to migrate to the Nickel-Cadmium battery from any other type of battery can use this Battery Thermal runaway isolator in conjunction with its DC Generation and distribution system without any change in the system. The Battery Thermal runaway isolator disconnects the Nickel-Cadmium battery automatically from the aircraft and gives appropriate indication to the aircraft display/monitoring systems when ever thermal run-away condition occurs. The Battery Thermal runaway isolator consists of DC Thermal Protection Contactor, Thermal Protection Relay (TP-Relay), Circuit Breakers (2 nos), Terminal Block, Connector & Diode (for reverse polarity protection).
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