Description
The XGN15-12(F)/T630-20 metal-enclosed 10kV Ring Main Unit is designed for medium-voltage distribution networks, providing loop supply, cable branching, and fault isolation. It supports load current breaking, short-circuit protection (with fuse-switch combinations), and can be equipped with a DTU for “three remote” functions (remote measurement, signaling, and control). The RMU meets GB/T 3906-2020, Q/GDW 12073-2020, and IEC 62271-200 standards, ensuring high reliability and safety for urban, industrial, and utility applications.
Key Features
- Rated Voltage: 12kV (system 10kV)
- Rated Current: 630A
- Short-Time Withstand: 20kA/3s
- Lightning Impulse Withstand: 75kV (peak)
- Mechanical Life: ≥5000 operations
- Protection Degree: IP4X (cabinet), IP67 (switch compartment)
- Optional Intelligent Features:
- Wireless temperature sensors (±1°C)
- Fault indicators (mechanical flip/LED)
- Communication protocols: IEC 61850 or IEC 60870-5-104
Construction
- Enclosure: 304 stainless steel or aluminum-zinc coated steel, ≥2.0mm thick
- Switchgear Options: Vacuum load break switch, SF6 insulated switch, or fuse-switch combination
- Gas System: SF6 filling pressure ≤0.04MPa at 20°C
- Busbar System: Fully insulated copper busbars
- Cable Terminations: Shielded, separable type, compliant with GB/T 12706
Typical Configurations
| Scheme ID | Circuit Arrangement | Application |
|---|---|---|
| H1 | Load break switch + fuse combination | Transformer branch protection |
| H2 | Three-position vacuum switch (open-close-earth) | Main loop node |
Installation & Testing
- Altitude: ≤1000m (derating above this)
- Humidity: Daily ≤95%, Monthly ≤90%
- Seismic Resistance: Horizontal ≤0.3g, Vertical ≤0.15g
- Cable Bending Radius: ≥20D (single-core)
- Acceptance Tests:
- Main circuit resistance ≤100μΩ (630A)
- Interlock function check – must lock properly
- SF6 leakage ≤0.5%/year
Operation & Maintenance
- Quarterly: Check SF6 pressure, remove foreign objects
- Annually: Lubricate moving parts with silicone grease, check bolt torque (25N·m ±10%)
- Troubleshooting:
- Electric operation failure – check DC48V supply and trip coil resistance
- Partial discharge alarm – inspect cable stress cone and busbar joints
Safety Notes
Do not open cable compartment without confirming earthing switch is closed
Always verify absence of voltage even if live indicator is off
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