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SF6 Gas-Insulated Ring Main Unit IEC standard-33kV to 40.5kV

  • SF6 Gas-Insulated Ring Main Unit IEC standard-33kV to 40.5kV

Key attributes

Brand ROCKWILL
Series RMR
Rated voltage (kV) 33/35/40.5
Rated current (A)(1) 630/1250
Power frequency withstand voltage 50 Hz 70/80/95
Short time withstand current (kA,rms/s) 20/4 or 25/3
Description

The RMR is an SF6-insulated medium voltage ring main unit(RMU). Its compact, fully enclosed design ensures long service life, maintenance-free operation, high reliability, and minimal environmental impact It is suitable for various occasions and meets the needs of different users. Ideal for diverse applications, including substations, industrial parks, infrastructure (airports, railways), and urban power grids.

Features

  • Compact: Saves space, fits urban substations. Reliable: SF6 gas insulation ensures stable performance. Fast Operation: Handles frequent switching for high power needs.
  • High Capacity: Handles heavy loads. Modular: Easy to expand and adapt. Low Maintenance: Sealed design reduces costs.
  • Reliable: Ensures uninterrupted power. Durable: Works well in harsh environments. Fast Fault Response: Quickly isolates issues to protect the system.
  • Tough: Works in extreme environments. Efficient: Manages high power flow. Low Maintenance: Minimal upkeep for remote areas.
  • Durable: Built for tough environments and constant use. High Capacity: Supports high-power equipment. Dust/Moisture Proof: Sealed design for dusty, wet conditions.
  • Durable: Works in harsh rural environments. Low Maintenance: Sealed design reduces costs. Cost-Effective: Affordable long-term operation.

Technical Specifications

Parameter Value
Rated voltage(kV) 33/35/40.5
Rated lighting impulse withstand voltage 1.2/50μs (kV peak) 170/185/250
Short-duration power frequency withstand voltage 50Hz 1min(kV) 70/80/95
Switch
Rated current (A)⁽¹⁾ 630/1250
Breaking current (A)⁽¹⁾ Normal load current 630
earth fault current 120
cable charging current 50
Short time withstand current (kA, rms/s)⁽²⁾ 20/4 or 25/3
Closing current of load switch and earth switch (kA peak) 50/63
Transformer circuit
Rated current (A) 200
Breaking current of no‑load transformer (A) 16

Multiple functional unit

SF6 Gas-Insulated Ring Main Unit IEC standard-33kV to 40.5kV

Free combination

SF6 Gas-Insulated Ring Main Unit IEC standard-33kV to 40.5kV

Application area

  • Urban Power Grid Reasons for Application: High power demand in cities requires reliable electricity. Rapid fault isolation to reduce power outage impact.
  • ndustrial Park Reasons for Application: High power needs in industrial parks. Complex networks require flexible solutions.
  • Infrastructure (Airports, Subways, Hospitals, etc.) Reasons for Application: Critical facilities need highly reliable power. Must handle harsh conditions and frequent use.

International standard

  • IEC 62271-1: Common Specifications for High-Voltage Switchgear and Controlgear Standards
  • IEC 62271-100: High-Voltage Switchgear and Controlgear – AC Circuit Breakers
  • IEC 62271-200: AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to 52kV
  • IEC 62271-102: AC Disconnectors and Earthing Switches
  • IEC 62271-103: High-Voltage Switches

Documentation Resource Library Ring Main Unit

Restricted
RMR-33 SF6 Gas-Insulated Ring Main Unit 33kV, 35kV, 40.5kV RMR-33 SF6 Gas-Insulated Ring Main Unit 33kV, 35kV, 40.5kV
Catalogue
English
PDF
Public.
Rockwill Electric Group Profile Rockwill Electric Group Profile
Brochure
English

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On-time delivery rate
Response time
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≤4h
Company overview
Workplace: 108000m² Total staff: 700+ Highest Annual Export(usD): 150000000
Services
Business Type: Design/Manufacture/Sales
Main Categories: Medium and High Voltage Switchgear/Power and Distribution Transformers/Instrument Transformers and Sensors/Lightning Protection and Electrical Insulation/Substations and E-Houses/Electrical Panel and Controlgear
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