For power systems with different voltage levels, the grounding method of their neutral points varies. In China, according to our national conditions, the 6~66KV distribution systems primarily employ a small current grounding operation mode. To effectively prevent arc grounding in the system, eliminate grounding faults, and improve the quality of power supply, in accordance with the new regulations of the national specification for overvoltage protection design, arc suppression coils should be installed when the grid's capacitive current exceeds 10A. Since the grounding current in the power system grounded through an arc suppression coil is small, its interference with nearby communications is also minimal, which is an advantage of this grounding method.
In the past, our country's power grid commonly utilized manual tap-changing arc suppression coils. Due to the inability to monitor the capacitance current of the power grid in real-time, its main defects are manifested in the following two aspects:
Adjustments are not convenient; the device must be taken out of operation to make adjustments.
2. Difficulty in assessment, unable to accurately judge the system's operational status, thus it's challenging to ensure that detuning and neutral point displacement voltage meet the requirements.
Our BHG-XHX series of tap-changer arc suppression coils are developed and manufactured with a standard industrial-grade computer system, featuring a bus structure, multi-layer circuit board design, a full-color large LCD screen, and full Chinese character display. They offer stable and reliable operation, intuitive display, strong anti-interference capability, and come with comprehensive parameter settings and information query functions. This system overcomes the previous limitation of narrow adjustment range in various arc suppression coil devices and allows for adjustment.
This product is widely used in power supply industries, power plants, metallurgy, mining, coal, papermaking, petrochemicals, and other large-scale industrial enterprises for transformer substations. It is suitable for voltage levels of 6~110KV and is an ideal replacement for old-fashioned arc suppression coils. It is also a配套 product for grounding compensation and selector devices in newly constructed transformer substations.
