40.5kV SF6 Gas Semi-Insulated Ring Main Unit

40.5kV SF6 Gas Semi-Insulated Ring Main Unit

Overview

The 40.5kV SF6 gas semi-insulated RMU is a reliable medium-voltage power distribution unit designed for protection, monitoring, and control of electrical systems. With air-insulated inlet/outlet lines and an SF6 gas-sealed main circuit, it is ideal for load cabinet substations, photovoltaic, and wind power plants.

Key Features

• Safety: Complete mechanical and electrical interlocks.
• Durability: 30-year lifespan.
• Intelligent Monitoring: IT/OT tech for real-time data.
• Cost-Effective: Key components in gas tank with external copper row connection for reduced cost.

Technical Specifications

• Voltage: 40.5kV
• Rated Current: 630A
• Insulation Medium: SF6 & dry air
• Ambient Temperature: -40°C to +55°C
• Altitude: ≤3000m
• Humidity: ≤95%
• Frequency: 50/60 Hz
• Lightning Impulse Withstand Voltage: 185kV (Directly earthed), 215kV (Across disconnector)
• Power Frequency Withstand Voltage: 95kV (Directly earthed), 118kV (Across disconnector)
• Protection:
  • Indoor: IP2X
  • Tank with HV parts: IP67
• Impact Protection: IK07 (Indoor), IK10 (Outdoor)
• SF6 Leakage Rate: ≤0.01% annually
• Operating Pressure: 0.4 Bar (filled), 0.2 Bar (minimum)

Electrical Specifications

• Short-Time Withstand Current: 25kA/3s (Main Circuit, Earth Switch)
• Peak Withstand Current: 65kA
• Short Circuit Breaking Current: 25kA
• Mechanical Endurance:
  • Circuit Breaker: M2
  • Earth Switch: M1
• Electrical Endurance: E1 for both CB and Earth Switch

Compliance

Conforms to IEC 62271 series standards including IEC 62271-100, 62271-200, and others.

Declaration

This product is customizable based on specific project requirements.