Dry Type Arc Suppression Coil
1.Scope of application
Dry Type Arc Suppression Coil is an inductive coil with an iron core, which is installed between the neutral point of the transformer (or generator) and the earth to form a neutral point grounding system through the arc suppression coil. Its core function is to extinguish the arc: when a single-phase grounding fault occurs in the power grid, the arc suppression coil generates an inductive current to compensate for the capacitive current at the fault point, reducing the residual current to a level that is insufficient to maintain the arc, causing the arc to extinguish itself, thereby avoiding overvoltage and equipment damage.
2. Operation environment
1) Altitude: ≤1000 meters.
2) Ambient temperature: Maximum +45oC, Minimum -30oC.
3) Relative humidity: ≤90% (+25 oC).
4) Max Ground ramp degree: ≤3°.
5) Seismic level: ≤0.3m/s2 at horizontal direction and ≤0.15m/s2 at vertical direction.
6) Installation environment: No obvious and heavy pollution, no explosive and corrosive gas and dust, with good air ventilation and no severe vibration and shock.
7) If the application environment is different from the above standard conditions, please contact for customized designs.
3. Product advantages
1) Automatic tracking compensation
Modern arc suppression coil devices like the LXHZ type use pre-regulation technology to monitor the system capacitive current in real time and automatically adjust the compensation gear to achieve "zero response" compensation, ensuring that the arc is quickly suppressed during a fault.
2) Overvoltage suppression
By offsetting the capacitive current at the grounding point, the rising speed of the fault recovery voltage is reduced, and the resonant overvoltage caused by intermittent arcs is effectively suppressed.
3) Flexible compensation method
Supports over-compensation, under-compensation and full-compensation modes, and can select the optimal compensation strategy according to system requirements to improve power supply reliability.
4) Strong compatibility
When used with a grounding transformer, the neutral point can be artificially led out in a system where the neutral point of the transformer is not grounded (such as a △-connected main transformer), expanding the application scenario.
5) High reliability
Using dual-circuit starting (zero-sequence voltage + current) and secondary damping technology to enhance the system damping rate, avoid false operation and suppress resonance.
4. Applications
1) Small current grounding system
Applicable to distribution networks with voltage levels of 3~66kV, especially systems with single-phase grounding capacitance current exceeding the limit (such as 10kV system grounding current>20A).
2) Systems where the neutral point cannot be directly grounded
When the low-voltage side of the main transformer adopts Delta connection (no neutral point), the neutral point needs to be led out through a grounding transformer and connected to an arc suppression coil.
3) High reliability power supply scenarios
Such as urban power grids, industrial and mining power supply systems, etc., where grounding faults need to be quickly eliminated and continuous power supply needs to be maintained. 4) Suppressing arc faults
Lightning strikes, cable aging and other scenarios that are prone to single-phase arc grounding can reduce the impact of faults by compensating for capacitive current.
5) Intelligent grid
Integrated data monitoring, remote communication (RS485/422 interface) and other functions, adapted to integrated automated substations and intelligent distribution network systems.
Arc suppression coils use inductive current compensation technology to achieve rapid arc extinguishing in single-phase grounding faults, and have the advantages of suppressing overvoltage, flexible compensation and high reliability. They are widely used in medium and low voltage distribution networks, neutral point ungrounded systems and scenarios requiring high power supply reliability.
