Over-voltage online monitoring system based on the impulse full current of arrester

An over-voltage online monitoring system based on the impulse full current of arrester is developed in this paper. The system measures the wave head and amplitude of the impulse full current of arrester through external-integral rogowski coil, and transfers the measurement result to the upper computer via USB optical measuring system, and then implements the measurement and monitoring on over-voltage through function fitting software. This paper focus on the over-voltage fitting method based on the impulse full current of arrester, and achieves amplitude sample database of impulse current, amplitude of wave head and node voltage (residual voltage) by node voltage test and simulation of wave head and amplitude in different lightning and switching impulse action current, and obtains the impulse current and node voltage fitting algorithm according to mass of data, as well as compiles recovery software of impulse current-node voltage by use of Visual Basic to implement reduction of over-voltage amplitude.