Product Overview
Rockwill delivers reliable and high-performance earthing transformers designed for 66kV power systems. Our oil-immersed transformers are engineered to provide stable neutral grounding solutions while ensuring operational safety and system protection. Manufactured in compliance with international standards including IEC and GB, these transformers incorporate premium materials and rigorous quality control throughout production.

Basic Info.

Key Features

• Voltage Class: 66kV system voltage (200 BIL)

• Capacity Range: Standard units from 100kVA to 10,000kVA

• Winding Configuration: Optimized zigzag (ZNyn) design

• Cooling System: ONAN/OFAF cooling options

• Insulation: Mineral oil or synthetic ester fluid

• Construction:

• Corrugated tank or radiator cooling

• Hermetically sealed or conservator tank options

• CRGO silicon steel core

• Copper/aluminum windings

Technical Advantages

• Enhanced Safety: Built-in Buchholz relay and pressure relief device

• Low Impedance: Zero-sequence impedance <15&Omega; for effective fault current management

• Durability: Corrosion-resistant paint system for outdoor installations

• Efficiency: Reduced no-load losses through optimized core design

• Flexibility: Off-circuit tap changer (&plusmn;5% in 2.5% steps)

Typical Applications

Utility Networks:

• Neutral grounding for 66kV transmission systems

• Arc suppression coil connections

• Resistance grounding systems

 Industrial Plants:

• Petrochemical facilities

• Mining operations

• Steel manufacturing plants

Renewable Energy:

• Wind farm collector stations

• Solar PV substations

• Hydroelectric plants

Performance Specifications

• Temperature Range: -30&deg;C to +40&deg;C ambient

• Humidity: &le;95% monthly average

• Altitude: Up to 2000m ASL

• Sound Level: &le;75dB at 1m

• Efficiency: &ge;99.2% at full load

Testing Protocol
All units undergo comprehensive testing including:

• Zero sequence impedance measurement

• Induced overvoltage test (260Hz)

• Lightning impulse test (350kV)

• Temperature rise test (65K max.)

• Oil dielectric strength test (&ge;50kV)

Service Conditions

• Suitable for indoor/outdoor installation

• Wind resistant up to 35m/s

• Non-explosive environments

• Seismic capability: 0.3g horizontal acceleration