12kV-24kV SF6 GAS FREE INSULATED

12kV-24kV SF6 Gas-Free Insulated Ring Main Unit

Overview

The eco-friendly 12kV-24kV gas-free insulated RMU is a cutting-edge medium voltage power distribution solution. It provides advanced protection, monitoring, and control for urban, industrial, and residential applications. Designed with minimal footprint, safety, and flexibility, it’s perfect for single distribution stations and compact installations like box-type substations.

Key Features

• Environmentally Friendly: Utilizes dry air and vacuum disconnection, eliminating SF6 gas.
• Modular Design: High interchangeability and custom configurations.
• Full Insulation: Hermetically sealed with enclosed cable connections.
• Safety & Reliability: Comprehensive mechanical and electrical interlocks.
• Efficient Operation: Compact structure for easy installation and maintenance.
• Longevity: 30-year service life using advanced composite materials.
• Intelligent Monitoring: Real-time online monitoring through integrated IT/OT systems.

Technical Specifications

• Voltage Levels: 12kV, 17.5kV, 24kV
• Rated Normal Current: 630A
• Insulation Medium: Nitrogen (N2) & Dry Air
• Service Temperature: -15°C to +45°C
• Altitude: ≤1000m
• Humidity: ≤95%
• Frequency: 50/60 Hz
• Withstand Voltage:
  • Lightning Impulse: 75kV-125kV
  • Power Frequency: 28kV-50kV
• Protection Classes:
  • Indoor: IP4X
  • Outdoor: IP43 (Non-extensible)
  • HV Parts Tank: IP67
• Internal Arc Rating: AFLR 20/21 kA/1s
• Leakage Rate: ≤0.01% annually
• Operating Pressure: 0.4 Bar (at 20ºC)

Circuit Breaker & Load Break Switch Functions

• Rated Short-Time Withstand Current: 21 kA/s (Main Circuit, Earth Switch, Earth Circuit)
• Rated Peak Withstand Current: 52 kA
• Rated Short Circuit Breaking Current: 21 kA
• Fuse Switch Combinations:
  • Fuse Current: 125A
  • Short-Circuit Breaking: 31.5 kA

Mechanical & Electrical Endurance

• Mechanical Endurance:
  • Load Break Switch & Circuit Breaker: M2 Class
  • Earth Switch: M1 Class
• Electrical Endurance: E2 Class for all main components.

Compliance

The unit meets international standards including IEC 62271-100, 62271-102, 62271-103, and others, ensuring safety, reliability, and environmental sustainability.

Custom configurations available upon request.