XGN15-12 Ring Main Unit

Introduction: What Is the PINEELE XGN15-12Ring Main Unit?

ThePINEELE XGN15-12 Ring Main Unit (RMU)is an advancedair-insulated medium voltage switchgear systemdesigned for12/24kV power distribution applications. Built on years of engineering expertise, this RMU combinesSF₆ load switches,fuse combinations, and avacuum load switch mechanismto deliver superior performance, reliability, and operational safety.

This fixed-type modular switchgear system is ideal for a wide variety of urban, commercial, and industrial installations, includingpower grid upgrades,mining operations,high-rise buildings, andpublic utilities. Designed for both loop and terminal power supply configurations, it can also be deployed insidepre-fabricated substations.

ThePINEELE Ring Main Unitcomplies with theIEC 60420international standard and integrates the latest innovations in smart switching, system protection, and compact cabinet design. Whether you’re upgrading infrastructure or building new power systems, thePINEELE XGN15-12 RMUis built to support your operational goals.

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Key Features of PINEELE XGN15-12 Ring Main Unit

Advanced Modular Design

• Each unit of theRing Main Unitcan befreely expanded or combinedto meet various power system configurations, offering exceptional flexibility and customization.

Dual Compartment Layout

• The cabinet is divided intoupper and lower units. The upper includes the busbar room, switchgear, and control systems; the lower contains the cable connection area. This separation enhances safety and simplifies maintenance.

Intelligent Operating Mechanism

• Spring-loaded, corrosion-resistant mechanisms ensure long mechanical life.
• Thethree-position SF₆ rotary load switchis paired with mechanical interlocks forFive-Prevention Safety.

Integrated Low-Voltage Control Room

• The compactcontrol compartmentsupports a wide range of accessories: trip coils, metering instruments, relay protection, capacitive voltage displays, and motorized operation units.

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Environmental & Operating Conditions

To ensure consistent operation and durability, thePINEELE XGN15-12 Ring Main Unitis designed for use in the following conditions:

Condition	Specification
Ambient Temperature	-15°C to +40°C
Daily Avg. Temperature	≤35°C
Altitude	≤1000m
Relative Humidity	Daily ≤95%, Monthly ≤90%
Vapor Pressure	Daily ≤2.2kPa, Monthly ≤1.8kPa
Seismic Intensity	≤Magnitude 8
Site Conditions	No corrosive or flammable gas environments

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Technical Specifications

Parameter	Unit	12kV	24kV
Rated Voltage	kV	12	24
Rated Frequency	Hz	50/60	50/60
Main Busbar Current	A	630	630
Branch Busbar Current	A	630 / 125①	630 / ≤100②
Power Frequency Withstand Voltage	kV	42	65
Lightning Impulse Voltage	kV	75	85
Rated Short-Time Withstand Current	kA	20 (3s) / 25 (2s)	—
Peak Withstand Current	kA	50 / 63	—
Short-Circuit Making Current	kA	50 / 80	63 / 50
Short-Circuit Breaking Current	kA	— / 31.5	25 / 31.5
Transfer Current	A	— / 1750	— / 870
Active Load Breaking Current	A	630	630
Cable Charging Breaking Current	A	10 / 15 / 25	—
Protection Degree	—	IP3X	IP3X
Mechanical Life (Load Switch)	Times	5000 / 10000 / 3000	—
Mechanical Life (Grounding Switch)	Times	2000	2000

Note:
① Fuse cabinet rating up to fuse rated current
② ≤100A for load switch-fuse combination cabinet

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Cabinet Structure Overview

Busbar Room

• Located at the top, connecting the main switch units throughout the entire RMU row.

Switch Room

• Three-position rotary SF₆ load switchmade fromepoxy resin insulation.
• Can includegas density meter with alarmsupon request.

Cable Room

• Spacious for cable connections and optional installations such as:
  • Surge arresters
  • CTs
  • Grounding switches
  • Low-voltage control and protection devices

Low Voltage Room

• Equipped with auxiliary contacts, trip coils, emergency trip mechanisms, capacitive live displays, electric operating units, and more.
• Two identical compartments (in 750mm cabinets) support enhanced customization and redundancy.

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Top Advantages of the PINEELE Ring Main Unit

• Modular and expandable layout
• SF₆-insulated rotary switches for minimal maintenance
• High mechanical reliability with over 5000 cycles of endurance
• Equipped for grid automation (remote monitoring & control)
• Five-safety interlocking for personnel protection
• Compact footprint suitable for small substations and dense urban grids

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Frequently Asked Questions (FAQ)

1. What are the key benefits of using the PINEELE XGN15-12 Ring Main Unit?

ThePINEELE Ring Main Unitoffers exceptionalmodular flexibility,high safety standards, andlong service life. ItsSF₆ insulation,mechanical interlocks, and smart control compatibility make it an ideal choice for future-ready power distribution.

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2. Is the PINEELE RMU suitable for smart grid and automation?

Absolutely. It supports installation ofremote control terminals,motorized switchgear, andtelecontrol units, allowing real-time automation and intelligent energy management.

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3. What is the service life and maintenance requirement for this Ring Main Unit?

With a design life exceeding30 years, thePINEELE RMUoffersminimal maintenancedue to sealed SF₆ insulation and durable mechanical parts. The operating mechanism and electrical components are rated for thousands of cycles under standard use.

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Smart Infrastructure Ready – Future-Proofing with RMU Technology

ThePINEELE XGN15-12 Ring Main Unitis engineered not only for today’s infrastructure but also for thesmart, digital, and resilient grids of tomorrow. From urban utilities to renewable energy networks, this RMU delivers unmatched control, safety, and versatility.