500kVA 11kV Dry-Type Zigzag Grounding Transformer

Product Introduction

The Dry-Type Zigzag Earthing/Grounding Transformer 500kVA 11kV is designed to provide an effective neutral grounding solution for medium-voltage power systems. By creating an artificial neutral point, the zigzag transformer limits earth fault currents, stabilizes system voltage, and enhances overall grid safety. Its zigzag winding configuration ensures balanced performance under normal operation while offering low zero-sequence impedance during ground faults. Featuring a dry-type insulation system, this transformer eliminates the risk of oil leakage and fire hazards, making it ideal for indoor substations and environmentally sensitive installations. The low-loss core design minimizes energy consumption and heat generation, ensuring high efficiency and long service life.

Product Parameters

Design Tests

All transformers will be test after finished the production, test items as follows:

• Insulation Power Factor
• Winding Resistance
• Impulse Tests
• On load Loss Test
• No Load Loss Test
• Leak Test
• DC Insulation Resistance Test
• Transformer Turns Ratio/TTR (All Tap Voltages)
• Impedance Voltage & Load Loss (Rated Voltage)
• Excitation & No-Load Loss (Rated Voltage)
• Applied Voltage
• Induced Voltage
• Lightning Impulse
• Insulation Resistance (Rated Voltage)
• Temperature Rise

Customization Optional

The 500kVA 11kV Dry-Type Zigzag Earthing Transformer offers extensive electrical customization to meet different grounding and protection requirements. Voltage ratings can be tailored to match system nominal voltages, while impedance values may be adjusted to control earth fault current levels precisely. Customers can specify continuous or short-time fault current ratings according to grid protection schemes. Optional neutral grounding resistors (NGRs) can be integrated to further limit fault currents and coordinate with protection relays. Winding conductor material options include high-purity copper or aluminum, selected based on thermal performance and cost considerations.

From a mechanical and environmental perspective, the transformer can be customized for indoor or sheltered outdoor installation. Insulation class, temperature rise limits, and cooling design are configurable to suit ambient conditions. Low-noise core construction is available for installations near sensitive environments. Enclosure options include open-frame, IP-rated metal enclosures, or ventilated cabinets. Optional monitoring accessories such as temperature sensors, space heaters, and protective relays can be integrated to enhance operational reliability and maintenance efficiency. This flexibility ensures seamless integration into a wide range of medium-voltage systems.