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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.
Turning arc-suppression coil& grounding transformer complete set
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.
Bias magnetic arc suppression coil& grounding transformer complete set
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.
Phase-controlled arc suppression coil complete setThe phase-controlled arc suppression coil uses advanced algorithms to select lines for high-voltage grounding lines. The line selection is accurate and fast. It is widely used in the distribution station of power supply industry, power plants, metallurgy, mining, coal, papermaking, petrochemical and other large factories and mining companies. It is suitable for the voltage level of 6~66KV. It is an ideal replacement product of the old arc suppression coil, and it is also the first choice of supporting products for the grounding compensation and line selection device of the new substation.Composition of the devicePhase-controlled arc suppression coil is composed of grounding transformer, phase-controlled arc suppression coil, local control cabinet, computer controller, etcArc extinguishing& harmonic elimination and overvoltage protection device Arc-suppression& harmonic elimination and over-voltage protection devices can limit the phase-to-phase and phase-to-ground over-voltage of the neutral point ineffectively grounding system to the safe range of the power grid, it completely solve the threat of various over-voltages to the power grid, and improve the reliability of safe power supply of the power grid.
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