Earthing transformer-XinYa China manufacturer
China earthing transformer Supplier,Factory 27 years in GuangDong
By Xinya Power editorial team
Earthing Transformer: Technical Overview for Power System Grounding
An earthing transformer is a specialized transformer used to create a neutral point in electrical power systems where a physical neutral is not available. It is commonly applied in delta-connected networks, ungrounded systems, and industrial power distribution installations to provide a reliable path for earth fault current. The most common configurations are zigzag-connected earthing transformers and star-delta earthing transformers. The primary function of an earthing transformer is to limit earth fault current to a controlled level while maintaining system stability during single-line-to-ground faults. By connecting the transformer neutral to ground through a resistor or reactor, the system can detect fault currents, operate protective relays, and prevent overvoltage conditions caused by intermittent arcing faults. Zigzag earthing transformers are widely used because they offer low zero-sequence impedance under fault conditions and high impedance under normal balanced operation. This allows the transformer to remain lightly loaded during normal service while responding effectively during ground faults. Star-delta earthing transformers provide similar functionality, with the delta secondary winding helping to stabilize the neutral point. Key design parameters include rated system voltage, continuous neutral current, fault current rating, fault duration, zero-sequence impedance, insulation level, and cooling method. Earthing transformers are typically rated for short-time duty, so thermal capacity during earth faults must be verified. They are commonly installed in substations, renewable energy plants, industrial facilities, and medium-voltage distribution networks. Proper selection depends on system grounding requirements, fault level calculations, protection coordination, and applicable standards. Regular inspection of neutral connections, insulation condition, grounding resistors, and protective devices helps ensure reliable performance.
China XINYA Power Cables Co., Ltd Email: [email protected] Email: [email protected] whatsapp: +86 15289885778 Website: https://www.supplytransformer.com
