The wireless sensor has been widely applied in the field of power monitoring system; one of the difficulties in the design of the whole system design is the power supply. Because of the particularity of installation location of the wireless sensor, a self-supply power of the high-voltage side is designed in this paper. To limit the voltage and current output of the Current Transformer (CT) in the large current state, a simpler and more reliable direct limit mode-flat-wave reactance limit mode is adopted. It uses saturation characteristics of CT, and the current from 1A～50000A on busbars is converted to voltage energy 1～60 V. By comparing the experimental results with the iron-core of permalloy and amorphous, the circuit model of the CT is analyzed, eventually, the calculation formula of the iron-core specification is given. The experimental results demonstrate that the scheme is feasible.
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