This paper suggests a new method to measure the resistance leakage current wirelessly for metal-oxide surge arrester. The method has two devices

transmitting module and receiving module. The radio theory is adopted to collect the voltage phase information and to change it in-to pulse signal with certain circuit. The transmit device modulates the signal with phase information and sends it to the RF receive device by radio. The pulse signal of phase is demodulated by the RF receive device and compared with the phase of total leakage current of surge arrester. Phase differences between the network voltage and total leakage current of surge arrester are obtained. Then

the value of resistance leakage current is calculated

and the state of MOA can be judged.