15kV 20kV 22kV 30kV 33kV 35kV oil-immersed neutral grounding resistance to transformer (earthing transfoemer)

Product Introduction

With decades of focused expertise in the field of grounding transformers, we have built end-to-end independent capabilities—from core R&D to scaled mass production—through sustained technological depth. Leveraging industry-leading product performance and long-term reliability, we have established the technical benchmark in this field domestically, becoming a core force driving the advancement of grid safety.

Our 6-35kV (including 33kV) oil-immersed neutral grounding resistance transformers, also known as earthing transformers, are designed for medium-voltage grids. Using oil cooling technology, they safely dissipate heat. By creating a neutral point connection with a grounding resistance, these transformers quickly detect and limit ground faults. Ideal for enhancing grid reliability, they offer robust protection against electrical failures, ensuring stable power supply for industrial and commercial applications.

Performance Advantages

• Energy-Efficient & Eco-Friendly: Low-loss, low-noise, and high-efficiency design reduces energy consumption and environmental impact.

• Fully Sealed & Maintenance-Free: No oil storage tank required. Corrugated tank design automatically adjusts for oil volume changes, eliminating leakage risks.

• Extended Lifespan: Sealed structure isolates oil from air, slowing degradation and insulation aging. Reduces maintenance costs and extends operational life.

Main technical specifications

The following table details the key technical specifications of the product, comprehensively covering electrical performance, mechanical characteristics, and dimensional parameters to provide a clear reference for technical selection and application scenarios.

Some of these earthing transformers cover voltage levels including：3.3kV / 6kV / 11kV / 15kV / 20kV / 22kV / 30kV / 33kV / 34.5kV / 36kV / 44kV / 66kV / 88kV / 110kV / 132kV / 145kV / 150kV / 220kV / 275kV / 330kV / 400kV, etc. The current withstand time ranges from 1s, 2s, 3s, 5s, 6s, 8s, 9s, 10s, 30s, 60s, 1hour to 2hours, and customization is available.

Operating Conditions

• Altitude:≤1,000 meters

Ambient Temperature:

• Maximum ambient temperature: +40°C

• Maximum daily average temperature: +30°C

• Maximum annual average temperature: +20°C

• Minimum outdoor temperature: -25°C