under frequency relay 低频率继电器
low-frequency relay 低频继电器
voice-frequency relay [通信] 音频继电器
high-frequency relay [电] 高频继电器
slip frequency relay 差频继电器
low frequency relay 低周率继电器
Under-frequency relay and equipment 欠频率继电器及装置
voice frequency relay 话频电流继电器
radio frequency relay 射频继电器
The distributed parameters of signal path of high frequency relay are the main factors that influence the radio frequency (rf) performances of relay.
高频继电器信号路径的分布参数是影响继电器射频(RF)性能的主要因素。
A repetition rate, or operating frequency, lower than that allowed by the switching times is often specified for a relay.
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。
The frequency changing relay is out of order. It can not change frequencies.
频率转换继电器故障，不能转换频率。
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