Transformer neutral point grounding resistance cabinet

In the 6-35KV AC power grid of my country’s power system, there are ungrounded neutral points, grounded through arc suppression coils, high-resistance grounded, and small-resistance grounded. In the power system (especially the urban network power supply system with cables as the main transmission lines), the ground capacitive current is large, which may make the occurrence of “intermittent” arc ground overvoltage have specific “critical” conditions, resulting in arcing The application of the neutral point resistance grounding method for the generation of grounding overvoltage forms a discharge channel for the energy (charge) in the grid-to-ground capacitance, and injects resistive current into the fault point, making the grounding fault current take on a resistance-capacitance nature, reducing and The phase angle difference of the voltage reduces the re-ignition rate after the current at the fault point crosses zero and breaks the “critical” condition of the arc overvoltage, so that the overvoltage is limited within 2.6 times of the phase voltage, and at the same time guarantees high-sensitivity ground fault protection The equipment accurately determines and cuts off the primary and secondary faults of the feeder, thus effectively protecting the normal operation of the system.