For power systems with different voltage levels, the neutral point grounding mode is different, according to China's national conditions, China's 6~66KV distribution system mainly uses small current grounding operation mode. In order to effectively prevent the arc grounding of the system, eliminate the grounding fault, and improve the quality of power supply, according to the new regulations of the national design code for overvoltage protection, when the capacitor current of the power grid exceeds 10A, the arc suppression coil device should be installed. Because the grounding current of the power system grounded through the arc suppression coil is small, the interference to the nearby communication is also an advantage of this grounding method.
In the past, China's power grid generally used manual turn arc suppression coil, because it can not monitor the capacitive current of the power grid in real time, its main defects in the following two aspects:
(1) The adjustment is not convenient, and the device can be adjusted only when it exits the operation.
(2) It is difficult to make an accurate judgment on the operating state of the system, so it is difficult to ensure that the detuning degree and neutral displacement voltage meet the requirements.
The NRXHXQII-TZ turn suppression coil device developed and produced by our company adopts standard industrial computer system, bus structure, multi-layer circuit board design, large screen touch LCD screen, full Chinese character display. It has the characteristics of stable and reliable operation, intuitive display, easy operation, strong anti-interference ability, etc. At the same time, the system has perfect parameter setting and information query function. The system overcomes the limitation of small adjusting range of previous arc-suppressing coil devices and can be adjusted comprehensively.
The device adopts advanced algorithms such as residual current increment method and active power method to select the high-voltage grounding line accurately and quickly.
This product is widely used in power supply industry, power plants, metallurgy, mining, coal, paper, petrochemical and other large factories and mining enterprises of the transformer distribution power station, applicable voltage class 6 ~ 66KV, is the old arc suppression coil ideal replacement products, but also the new substation grounding compensation and line selection device of choice supporting products.