KA5为跳闸报警继电器。当设备产生偏励磁、可控硅故障、过电流等故障时，KA5吸合，断路器分励线圈得电跳闸，切断主电源。
When there are bias excitation, controllable silicon failure, over current and other failures, KA5 gets absorbed and breaker loop trips by powered on so as for switching off main power supply.
DSP主要完成采样、PI调节和通信等，实现偏磁式消弧线圈励磁电流的数字控制。
The DSP realizes functions of sampling, PI regulation, communication and so on to digitally control the excitation current of arc-suppression coil with magnetic bias.
应用两种形式的励磁线圈，实测了五种型号的真空灭弧室内气体压强与磁控放电离子电流的关系曲线，并对试验结果进行了理论分。
Two types of exciting coils have been used to obtain the relationship of the internal pressures and the ionic currents of magnetron discharge for 5 types of vacuum interrupter.
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