0212 640 90 96

24kV SF6-Free Dry Air Insulated RMU (Ring Main Unit)

Property Specification

Type: 24 kV SF6-Free Dry Air Insulated Compact Switchgear / Ring Main Unit (RMU)

Features: Using dry air insulation, this compact secondary distribution switchgear completely eliminates dependence on SF6 gas while also avoiding complex environmental regulations. The system features a reinforced, sealed stainless steel tank housing vacuum circuit breakers, puffer-type load-break switches, and earthing switches within a space-saving 325 mm modular width. Key/mechanical interlocking and internal arc withstand deliver maintenance-free operation, reduced thermal losses, and comprehensive operator protection; options are available for AC/DC motor drives and flexible monitoring indicators.

Applications: Designed for modern secondary power distribution networks up to 24 kV, this climate-friendly switchgear was developed specifically for utility distribution companies, compact secondary substations (CSS), and ring-network automation. It provides low-impact, high-reliability circuit protection for light industrial facilities, commercial real estate, public institution buildings, and municipal infrastructure projects seeking green-building compliance.

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Description

Technical Comparison Matrix

Performance Characteristic / Parameter Medium-Voltage Dry Air RMU Technical Specifications
System Rated Voltage (Ur) 24 kV
Rated Operating Frequency 50 Hz
Continuous Load Current Capacity (Ir) 630 A
Short-Time and Peak Withstand Capacity 20 kA (3 s duration) | Peak Current: 50 kA
Phase-to-Earth Short-Circuit Withstand 20 kA (1 s duration) | Peak Current: 50 kA
Insulating Gas Pressure Thresholds

• Rated Filling Pressure (absolute): 250 kPa

• Minimum Functional Level (absolute): 230 kPa
Dielectric Withstand Voltage Ratings

• Power Frequency (1 min dry): 50 kV

• Lightning Impulse (BIL Peak): 125 kV
High-Voltage DC Cable Diagnostics 60 kV DC applied for 60 minutes
Load-Break Switch Functionality

• Charging Breaking Capacity: Cable: 60 A | Line: 1.5 A

• Earth Fault Breaking Capacity: 180 A (cable/line under earth fault: 104 A)

• Peak Short-Circuit Making Current: 50 kA

• Endurance Classification: Switch: E3, C2, M1 | Earthing Switch: E2, M0
Fused Combination Switch

• Main Breaking Capacities: Active Load: 200 A | Closed-Loop Line: 200 A

• Line and Cable Breaking: Cable: 16 A | Line: 1.5 A

• Earth Fault Breaking Capacity: 48 A (28 A under fault conditions)

• Short-Circuit Breaking Rating: 20 kA

• Downstream Earthing Capacity: 2.5 kA (1 s) | Peak: 6.3 kA

• Endurance Classification: Switch: M1 | Earthing Switch: E2, M0
Vacuum Circuit Breaker

• Short-Circuit Breaking Capacity: 20 kA (3 s duration)

• Standard Operating Duty Cycle: O – 0.3s – CO – 15s – CO

• Line and Cable Charging Current Breaking: Line: 10 A | Cable: 31.5 A

• First-Pole-to-Clear Factor (Kpp): 1.3 and 1.5

• Breaker Endurance Class: E2, C2, S1, M2

• Earthing Switch Capacity: 20 kA (3 s three-phase / 1 s single-phase) | Class: E2, M1

 

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