Description

Earthing transformers are specially designed transformers. Their core function is to provide an artificial neutral point for power grids where the neutral point is either ungrounded or grounded through high impedance. This enables the neutral point to be grounded via an arc suppression coil or a small resistor.

The oil-immersed, high-voltage bushing side-mounted type grounding transformer (commonly referred to in the industry as the "high-voltage side-mounted grounding transformer") is a specialized variant. As the name implies, the high-voltage bushings (i.e., the terminals of the high-voltage winding) of this type of transformer adopt a side-mounted design, positioned on the side of the transformer tank rather than on the top.

This structural design significantly reduces the overall installation height of the equipment, making it particularly suitable for space-constrained installations, such as indoor GIS (Gas-Insulated Switchgear) rooms, compact substations, and retrofit projects in existing substations.

Features

• Space Optimization: The side-exit bushings significantly reduce the overall equipment height, enabling easy adaptation to low-clearance spaces or retrofit requirements in existing substations, saving civil engineering costs.

• Flexible Grounding: Provides a stable neutral point, allowing flexible connection to a resistor cabinet / arc suppression coil. This effectively limits ground fault current, suppresses overvoltages, and enhances system safety and power supply continuity.

• High Reliability:
  Impact Resistance: Designed to withstand the impact of unbalanced currents and zero-sequence currents generated by system single-phase-to-ground faults.
  Low Losses: Employs high-quality silicon steel cores and advanced manufacturing processes to ensure low no-load and load losses.
  Robust Insulation: Features a reliable high-voltage insulation structure with low partial discharge levels.
  Excellent Protection: High enclosure protection rating (IP), providing effective dust and moisture resistance.

• Simplified Installation & Maintenance: Compact structure combined with the side-exit wiring design optimizes both on-site installation and subsequent maintenance operations.

Main Technical Parameters