Abstract
This chapter explains tripping batteries and their applications. The operation of monitoring devices such as relays and the tripping mechanisms of breakers require independent power source, which does not vary with the main source being monitored. Batteries provide this power and hence they have an important role in protection circuits. The relay/circuit breaker combination depends entirely on the tripping battery for successful operation. Without this, relays and breakers will not operate, becoming solid, making their capital investment very useless and the performance of the whole network unacceptable. Battery charging is accomplished with sophisticated electronically controlled rectifiers that permit a battery to be continuously maintained on a floating charge and to recharge a discharged battery as fast as possible. It also has to handle the electrical load. The chapter provides guidelines for maintaining a lead acid battery system, which are also applicable for nickel cadmium batteries. It is necessary to monitor that the trip supply is available in a trip circuit to ensure that the system is continuously being monitored. This is sometimes achieved by means of “fail-safe circuits,” which ensure that there is no question of operating a system without monitoring.
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