继电器往往会以开关时间规定一个重复率，或者说是工作频率，使用时需低于该值。
A repetition rate, or operating frequency, lower than that allowed by the switching times is often specified for a relay.
频率转换继电器故障，不能转换频率。
The frequency changing relay is out of order. It can not change frequencies.
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.
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