Analysis and comparison of resonance grounding with low resistance grounding

The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage network is grounded with petersen coils or low resistance. This article compares the two grounding modes technically. Varieties of operation characters and parameters are researched in the two different grounding systems. Besides, interference to communication is taken into account. Reliability of power supply, security and economy of power grids are discussed. And reference suggestions are proposed for operations of distribution network.