Neutral grounding resistor cabinet, that is, between the neutral point of access to a resistor in series. Select the appropriate resistor value received, not only can discharge energy half-wave single-phase ground after the arc, thus reducing the possibility of reignition suppress over-voltage grid convergence value, can also increase the sensitivity of the protection device to act on the trip, so as to effectively protect the system running. Previous low pressure system mainly uses direct grounding or no grounding. When single-phase ground fault occurs, the neutral point voltage direct grounding system remains the same, but the system neutral point current is too large, easy to make insulation breakdown, burn the neutral point of the system. If the system is not grounded way, over-voltage is N times the rated voltage, as a result of over-voltage arc and ferromagnetic resonance non-fault phase voltage rises several times, which is insulated and thermal stability of electrical equipment are threat. The neutral grounding resistor cabinet it was in the low-pressure system 0.22KV ~ 0.66KV grounding resistor sets of devices. In order to improve the 0.66 / 0.38 / 0.22 (KV) low voltage power system power quality, and reduce power outages due to equipment caused when a ground fault occurs within low-voltage electric power plant main plant should employ high resistance grounded system, not only to avoid the When single-phase ground do not have to trip immediately, but when the chance of using electrical fuses for protection of electrical equipment to reduce runtime burned. www.sddqel.com/