The proposed composite current detection scheme combines two different isolation detection technologies, namely tunneling reluctance and the Rogowski coil. Therefore, this paper designs a non-intrusive, AC-DC wide-bandwidth current sensor based on the composite measurement principle. Traditional current sensors for power grids are bulky, have a narrow measurement range, and cannot measure both AC and DC at the same time. In addition to power frequency, the current signal of power grid also includes several DC signals, as well as medium-high and high-frequency transient signals.
With the accelerated construction of the smart grid, new energy sources such as photovoltaic and wind power are connected to the grid.
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