High Impedance Earthing of Step-up Transformers
![High Impedance Earthing of Step-up Transformers](https://www.ukeic.com/hubfs/EIC_November_2022/images/kOOaGiN2qthnfKi7kLUQV3dU69XY8tBjWXSkIsvF.jpg)
The Distribution Network Operators (DNOs) maintain and operate extensive overhead line networks. When a fault occurs on an overhead line following large-scale events, such as storms, sections of high voltage (HV) 11kV and 20kV networks can become disconnected from in-feeding transformers.