Purpose. Earthing relays are utilized very commonly in open-pit mines for disconnecting the failure part of 6 kV electric system from earthing incident. Much previous research is mentioned on searching either an optimal method improving effect or improvements reducing overvoltage caused by grounding separately. The paper presents a new approach to not only sensitivity but also limiting over-vol...

The inductor-based and capacitor-free bipolar pulse converter can be applied to electric vehicle charging realize an efficient reliable charging-control strategy. Inductor-based converters avoid the failure caused by of energy storage capacitors improve reliability. An overvoltage protection scheme based on active clamping topology is used protect this when load impedance too large. This take e...