Arc Suppression Coil Complete Set

Arc Suppression Coil Complete Set Description:

With the increasing scale of the power system, especially the extensive use of cables in the distribution network, the capacitive current of the system increases greatly. In this case, when a single-phase ground fault occurs, the arc formed by the grounding capacitive current at the fault point cannot be extinguished by itself. At this time, if the neutral point is grounded by the arc suppression coil, this problem will be solved well. Therefore, the power industry standard DL/T620-1997 “Overvoltage Protection and Insulation Coordination for AC Electrical Installations” clearly stipulates that when the single-phase grounding fault current is greater than 10A for the system composed of 3-10kV overhead lines and all 35,66kV power grids, the neutral point shall be equipped with an arc suppression coil; For the system composed of 3-10kV cable lines, when the single-phase grounding fault current is greater than 30A, the neutral point shall be equipped with an arc suppression coil.

On the basis of summarizing the operation experience of arc suppression coil control device for many years, our company has widely adopted the suggestions of new and old users, and successfully developed ZXHK series arc suppression coil automatic tuning and grounding line selection controller. The controller integrates automatic tuning and single-phase grounding line selection, which can not only measure and display the voltage and current signals of the neutral point in real time, but also calculate the capacitive current and detuning degree of the power grid accordingly, and realize automatic tracking tuning: the residual current, loop capacitance, neutral point voltage, current and other parameters of the current power grid are displayed in real time on the LCD screen of the controller panel; the current gear signal and fault alarm signal of the arc suppression coil have remote output, which can be connected to the dispatching center; moreover, it can adopt various criteria for single-phase grounding line selection. The controller is also equipped with a manual adjustment function for use when necessary.

Arc Suppression Coil Complete Set Features:

1. Features of the device:

Higher safety: the damping resistance is connected in series at the outgoing line side of the arc suppression coil, which can effectively avoid the resonance overvoltage of the system.

Higher reliability: The device adopts strong and weak electrical isolation, isolated power supply, software and hardware watchdog, hardware continuous self-check technology, photoelectric isolation, and non-contact design to ensure the high reliability of the system .

Modularization of control system: the control unit can support two bus sections at most. Each functional module of the control unit is designed as an independent plug-in and configured according to the requirements of the user.

Flexible communication method: The controller has RS-232, RS-485 serial interfaces and communication components, which can be used as a sub-station to connect to various integrated automation systems for remote measurement, remote signaling, and remote control.

2. Features of turn-adjustable/capacitive-adjustable products:

Fast grounding compensation speed: The turn-adjustable arc suppression coil adopts pre-adjustment compensation, which can compensate for a single-phase ground fault within 2ms, greatly reducing the probability of a transient ground fault developing into a permanent fault.

High reliability of the system: the turn-adjustable arc suppression coil has a simple structure and high reliability, and the compensation of the arc suppression coil is less dependent on the power supply and the controller, which can continue to be compensated in the event of faults and abnormalities.

Complete isolation of primary and secondary system: The damping resistance protection of the damping box of the complete device adopts SCR self-triggering technology to realize double short-circuit protection and ensure complete isolation of the primary and secondary systems.

Perfect protection function: the perfect protection functions designed include gear end-to-end locking, back and forth adjustment locking, continuous adjustment locking, single-phase grounding action locking and other perfect locking protection functions to ensure the safe and reliable operation of the whole system.

3. Features of phase controlled products:

Wide adjustment range: the compensation current of phase controlled arc suppression coil has a wide adjustment range, which is stepless and continuously adjustable within the rated current range.

Small compensation residual current: the continuous and smooth adjustment of phase controlled arc suppression coil can minimize the residual current and ensure reliable arc extinguishing.

Arc Suppression Coil Complete Set Application:

Arc suppression coil automatic adjustment and grounding line selection device can be widely used in 6-66kV voltage level power system substations at all levels, large and medium-sized city distribution network and power plants, steel, coal, chemical, petroleum and other power systems. It is used to compensate the capacitive current of the power grid and improve the reliability and safety of the system power supply.