Grounding resistance cabinet

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With the rapid development of urban and rural power grids, great changes have taken place in the power grid structure, and a distribution network dominated by cables has appeared. The ground capacitance current has increased sharply. When a single-phase ground fault occurs in the system, there are fewer and fewer recoverable faults. The use of resistance grounding method not only adapts to the main development and change requirements of my country’s power grid, but also reduces the insulation level of power transmission equipment by one or two grades, reducing the investment of the overall power grid. Cut off the fault, suppress the resonance overvoltage, and improve the safety and reliability of the power system.

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At present, the neutral point grounding method through resistance has been written into the power industry regulations. The power industry standard D L/T620-1997 “Overvoltage Protection and Insulation Coordination of AC Electrical Installations” stipulates in Article 3.1.4: “5~35KV is mainly composed of For the power transmission and distribution system composed of cable lines, when the single-phase ground fault has a large capacitive current, the low-resistance grounding method can be used, but the reliability requirements of power supply, the impact of transient voltage and transient current on electrical equipment during faults, and Impact on communication Relay protection technical requirements and local operating experience, etc.” Article 3.1.5 stipulates: “5KV and 10KV power distribution systems and power plant power systems, when the single-phase ground fault capacitor current is small, in order to prevent Harm to equipment such as resonance, gap, I arc grounding overvoltage, etc., can be grounded with high resistance.”

For the design and selection of resistance cabinets, please also refer to: DL/780-2001 Distribution System Neutral Grounding Resistor Neutral Grounding Method is a method that involves the insulation level of lines and equipment, communication interference, relay protection and power supply network security Because of the comprehensive problem of reliability and other factors, the power supply systems of my country’s distribution network and large industrial and mining enterprises are different. In the past, most of them used the operation mode of ungrounded neutral point and grounded by arc suppression coil. In recent years, due to the development of the power system and the increase in power consumption of users, some provincial and municipal power grids have vigorously promoted the operation mode of resistance grounding.