The development requirements of miniaturized electronic equipment of grounding resistance cabinet are light, compact and compact, To a large extent, it belongs to the miniaturization of components. The grounding resistance cabinet is resistant to high temperature and low temperature, humidity, low pressure, radiation, salt fog and mold, vibration and shock. The performance parameters of grounding resistance cabinet include rated power consumption, nominal resistance and allowable deviation, resistance temperature coefficient, high frequency characteristics, nonlinear and current noise, limiting voltage, etc Excellent. The resistance value of grounding resistance cabinet is stable, and the temperature coefficient of resistance is 2.17 × 10-4 Ω ℃, which ensures the sensitivity of protection.
In order to improve the power supply quality of 0.66/0.38/0.22 (kV) low-voltage power system and reduce the equipment power failure caused by grounding fault, the low-voltage power supply system in the main power house of the power plant should adopt high resistance grounding, which not only avoids the need for immediate tripping when the single-phase grounding occurs, Moreover, when the fuse is used as a protective electrical appliance, the probability of burning down when the electrical equipment is running is reduced.