Product Introduction
Overview
• A dry type earthing transformer is a resin-encapsulated or cast-coil unit that provides a defined neutral point and zero-sequence path without using insulating oil. Designed for indoor or sheltered outdoor installation, it offers high dielectric strength, mechanical robustness, and thermal stability, enabling reliable neutral grounding in medium-voltage systems where fire safety and low maintenance are critical.
Application
• Dry type earthing transformers are applied on delta or isolated medium-voltage networks in industrial plants, wind and solar farms, data centers, tunnels, and urban substations. They establish a stable neutral reference, often combined with grounding resistors or reactors, allowing precise earth-fault detection. This supports selective protection coordination, improved service continuity, and safer operation in space-constrained or fire-sensitive environments.
Technical
• Voltage Level: ≤36kV
• Rated Power: ≤Power capacities from 10 kVA to 100,000 kVA
• Frequency: 50/60 Hz
• Insulation Grade: up to 170 kV
• Cooling Types: ONAN/ONAF/OFWF
• Winding Material: Copper/Aluminum
• Voltage Regulation: Off Circuit
• Insulating Medium: Natural/Synthetic Ester / Mineral Oil
• Rated Power: ≤Power capacities from 10 kVA to 100,000 kVA
• Frequency: 50/60 Hz
• Insulation Grade: up to 170 kV
• Cooling Types: ONAN/ONAF/OFWF
• Winding Material: Copper/Aluminum
• Voltage Regulation: Off Circuit
• Insulating Medium: Natural/Synthetic Ester / Mineral Oil
Advantages
• Key advantages of dry type earthing transformers include elimination of oil handling, reduced fire risk, and suitability for indoor locations close to loads. Robust insulation systems and air cooling deliver high thermal withstand and short-circuit strength. Simple visual inspection, minimal routine maintenance, and compact footprint help owners control lifecycle costs while improving safety and grounding reliability in substations and plants.
Feature
• Dry type earthing transformers typically use zig-zag or star–delta connections, cast resin or vacuum impregnated windings, and naturally ventilated or forced-air cooling. Outdoor or indoor enclosures provide IP-rated protection and clear access to neutral terminals, grounding resistors, and monitoring points, allowing straightforward integration with switchgear, protection relays, and SCADA systems in modern distribution, industrial, and renewable installations around the world.
Environmental Conditions
• Suitable for both indoor or outdoor.
• Air temperature: Maximum temperature: +40ºC; Minimum temperature:-25ºC.
• Humidity: Monthly average humidity 95%; Daily average humidity 90% .
• Altitude above sea level: Maximum installation altitude: 2000m.
• Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
