Patent ID: 8405949

Claim:
A current sensor for measuring inhomogeneity of potential distribution of an arrester, the current sensor comprising: a) a metal casing; b) a protection circuit of a sampling resistor; c) a signal conditioning circuit; d) a signal acquisition circuit; e) an electro-optical conversion circuit; and f) a battery module; wherein being enclosed by said metal casing, said protection circuit of a sampling resistor, said signal conditioning circuit, said signal acquisition circuit, and said electro-optical conversion circuit are connected sequentially and electrically; said battery module is separately connected to and provides power for said signal conditioning circuit, said signal acquisition circuit, and said electro-optical conversion circuit; said protection circuit of a sampling resistor comprises a transient voltage suppression diode, and said transient voltage suppression diode is connected to said sampling resistor by parallel connection; said signal acquisition circuit comprises MSP430F149 micro controller unit as a signal acquisition and communication chip, said MSP430F149 micro controller unit comprises an A/D converter and a serial port, said A/D converter converts analog voltage signal into binary digital signal in real time, and said serial port sends encoded binary digital signal to said electro-optical conversion circuit; said encoded binary digital signal is processed by said electro-optical conversion circuit and sent to a signal processing unit at a low voltage side by a single fiber channel for further processing; and said metal casing is made of aluminum, and the shape of said metal casing is the same as that of an original metallic pad of said arrester.