电加热线圈是步进式调整的，第一步先调制。
Electric heating coils are step regulated, the first step being modulating.
该互感器以罗柯夫斯基线圈作为电流传感元件，以电容分压器作为电压传感元件，以光纤作为信号传输通道，借助有源电子调制和信号处理技术实现电流、电压的测量。
A Rogowski coil and a capacitive voltage divider are used as current sensor and voltage sensor respectively in the transducer and optic fibers are used to transmit signal.
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