Medium And High Voltage Switchgear

10kV Ring Main Unit (RMU)

10kV Ring Main Unit, State Grid standard, IP67 protection, manual/electric operation, optional smart monitoring, for loop supply and cable transition.

Rated Voltage10kV
Rated Current630A / 1250A (optional)
Short-Time Withstand Current20kA / 4s
Protection DegreeIP67 (enclosure)
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Description

The 10kV Ring Main Unit is designed for State Grid distribution networks, providing looped power supply, branch connections, and cable transitions. It features load switching, fault isolation, and optional remote monitoring. The unit complies with GB/T 3906-2020, Q/GDW 12073-2020, and IEC 62271-200 standards, ensuring safety, reliability, and long service life.

2. Key Features

  • High Protection Level – IP67 enclosure for harsh outdoor environments
  • Flexible Switch Options – Vacuum load break switch or SF6 insulated switch
  • Fully Insulated Busbar System – Copper busbars with full insulation covering
  • Smart Monitoring (Optional) – Remote monitoring of temperature, current, and fault alarms
  • Dual Operation Modes – Manual or motorized operation available

3. Technical Specifications

Item Value
Rated Voltage 10kV
Rated Current 630A / 1250A (optional)
Short-Time Withstand Current 20kA / 4s
Power Frequency Withstand Voltage 42kV / 1min
Protection Degree IP67 (enclosure)
Operation Mode Manual / Electric

4. Structure

  • Switch Unit – Vacuum load break switch or SF6 insulated switch
  • Busbar System – Copper busbars, fully insulated
  • Cable Terminations – Fully shielded separable type (GB/T 12706 compliant)
  • Smart Monitoring Module (optional) – Remote status and alarm functions

5. Installation & Commissioning

  • Ambient Temperature: -25°C to +40°C
  • Altitude: ≤1000m (derating above this)
  • Foundation: Concrete platform, level tolerance ≤ 2mm/m
  • Commissioning Steps:
    1. Insulation resistance test (≥1000MΩ)
    2. Mechanical operation test (5 times, no jamming)
    3. Power frequency withstand test (42kV/1min)

6. Operation & Maintenance

  • Routine Inspection: Switch position indicators, cable termination condition
  • Annual Maintenance: Clean insulation parts, retighten bolts
  • Common Troubleshooting: Lubricate moving parts, check control power, tighten loose connections

7. Safety Notes

Never operate under live conditions without isolating upstream power
Cabinet grounding resistance ≤ 4Ω

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