Arc Suppression Coil Complete Set Neutral Point Grounding Protection Equipment

Neutral point grounding protection equipment

Arc suppression coil complete set

Small/low current earth-fault line selection device

Arc suppression coil and grounding transformer complete device

Intelligent arc suppression coil grounding compensation device is mainly used in neutral point grounding through the arc suppression coil of 6kV,10kV,35kV power grids. It automatically tracks and compensates the grid capacitive current to keep it in the setting parameter range, eliminates grid system internal over-voltage and resonance over-voltage, it will automatically alarm when grounding fault occurs in the power grid, and has remote output interfaces to communicate with the host computer. This device is characterized by fast response speed, high accuracy, and solving the problem of crashes, etc. It is the best grounding electrical equipment for the vast of medium voltage distribution networks.

Purpose of installing arc suppression coil at neutral point:

1.Automatically eliminate the instantaneous single-phase grounding fault of the power grid.

2.When a permanent (metal) single-phase grounding fault occurs, there are two options: tripping after the fault line is detected by the line selection device or the microcomputer grounding protection. The power grid operates with a fault within a certain time, after the dispatching department transfers the load, it delays to trip the faulty line, which makes the power grid highly reliable.

Working principle

When the power grid is operating normally, the microcomputer controller of the arc suppression coil calculates the capacitance current to the ground in the current mode of the grid through real-time measurement and calculation. According to the preset minimum residual current value or detuning degree to determine the gear position where the arc suppression coil should be in, the on-load voltage regulating tap is controlled by the controller to adjust it to the required compensation position. After a ground fault occurs, the residual current at the fault point can be limited to the setting range to play an effective arc extinguishing and ensure the safety of the power supply system.

Working principle

When the power grid is running normally, the microcomputer controller of the arc suppression coil calculates the capacitance current to ground in the current mode of the grid through real-time measurement and calculation, and judges the output inductor current of the arc suppression coil based on the preset minimum residual current value or detuning. After the ground fault occurs, adjust the reactance value of the arc suppression coil to output the compensation current.

Residual current at the fault point can be limited in the setting range to effectively extinguish the arc and ensure the safety of the power supply system.