当电流超过限制值时，过负荷电流继电器自动保护振荡管和整流器，同时可以避免由不当操作所引起的频率漂移。
The over-current relay works to protect oscillation tubes and rectifier, when the current exceeds its limits. Frequency deviation caused by faulty operation is also prevented.
解释了有关熔断对整流器和功率半导体器件实现短路保护的原理。
Rectifier and semiconductor short circuit protection principles in respect to fusing are explained.
实践表明，压敏电阻作直流电源的整流器的保护元件优于二极管。
Practice shows that pressure sensitive resistance as a protective element of rectifier for D. C. supply is preferable to diode.
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