It is suitable for the microprocessor-based products of the 110KV and below voltage directs neutral ground, no grounded, the resistance or Petersen coil grounding of the main substation and distribution network. It protects, controls, measures and monitors the transmission line, transformer, capacitors, and motors. The equipments apply the unit design and make it easier to equip with the switching, and can also focus group screen. It makes the system-level management and information sharing come true because it support the multiple nodes working together.