XGN2-12 Ring Main Unit (RMU) – Metal-Enclosed High Voltage Switchgear for 12kV Power Distribution

Introduction to PINEELE XGN2-12 Ring Main Unit (RMU)

The PINEELE XGN2-12 Ring Main Unit (RMU) is a high-performance, metal-enclosed, air-insulated switchgear designed for 12kV three-phase AC 50Hz power distribution systems. Engineered with precision for environments requiring frequent operations, the RMU utilizes advanced vacuum circuit breakers and rotating-style isolation switches to ensure optimal electrical performance, safety, and reliability.

This Ring Main Unit adheres to both national (GB3906) and international (IEC298) standards, with protection ratings up to IP4X, making it the ideal solution for medium-voltage indoor power systems. With enhanced mechanical interlocking and advanced insulation technology, the PINEELE XGN2-12 RMU delivers robust, flexible solutions tailored for today’s evolving power infrastructure.

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Key Features of the PINEELE XGN2-12 Ring Main Unit

Modular Flexibility

• The RMU offers a highly modular and expandable design, using sulfur hexafluoride (SF₆) as the main insulation medium, and air insulation for other compartments.
• Its compact footprint supports flexible deployment in urban power networks, industrial terminals, and critical infrastructure.

Advanced Switching Mechanisms

• The main switch options include the ZN28A-12 segmental vacuum circuit breaker, the ZN28-12 integral vacuum breaker, and the ZN63-12 (VS1) breaker, combined with CD17/CD10 electromagnetic or CT17/CT19 spring operation mechanisms.
• The isolation switch utilizes GN30-10 rotating or GN22-10 high-current isolation technologies.

High-Level Protection

• All doors, grounding switches, and circuit mechanisms are equipped with robust mechanical interlocking systems, fulfilling the “Five-Prevention Safety” principle.

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Operating Conditions for the PINEELE XGN2-12 RMU

The PINEELE Ring Main Unit is built for harsh environments and conforms to strict operating parameters:

• Ambient Temperature: -25℃ to +40℃
• Altitude: ≤1000m
• Humidity: ≤95% daily average, ≤90% monthly average
• Vapor Pressure: ≤2.2×10³ MPa
• Seismic Resistance: ≤8 degree
• Installation Site: No fire, explosive risks, severe pollution, chemical corrosion, or strong vibration

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Technical Specifications Table

Item	Unit	XGN15-12(F) / 630-20	XGN15-12(F.R)/T125-31.5
Rated Voltage	kV	12	12
Rated Current	A	630	125
Rated Frequency	Hz	50	50
Rated Frequency Withstand Voltage	kV	42/48	42/48
Rated Impulse Withstand Voltage	kV	75/85	75/85
Rated Active Load Breaking Current	A	630	—
Closed-Loop Distribution Circuit Current	A	630	—
Short-Circuit Making Current (Peak)	kA	50	80
Peak Withstand Current	kA	50	50
Short-Time Withstand Current	kA	20	20
Short Circuit Duration	s	4	4
Rated SF₆ Gas Pressure (20°C)	MPa	0.04	0.04
Loop Resistance	µΩ	≤200	≤400
Mechanical Endurance (LBS/Earthing)	Cycles	5000/3000	5000/3000
Short-Circuit Breaking Current	kA	20/50	31.5/50
Transfer Current	A	—	1750
Protection Degree	—	IP4X	IP4X

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Structural and Functional Highlights

Metal-Enclosed Structure

The PINEELE Ring Main Unit is designed as a fully enclosed metal cabinet. Its IP2X/IP4X protection level prevents accidental contact and ingress of foreign materials, enhancing operational safety.

High Insulation Integrity

Utilizing porcelain support insulators (≥8000N) and a minimum insulation distance of 125mm, the system achieves higher dielectric strength and operational stability under stress.

Smart Grid Readiness

With built-in sensor compatibility and protective relays, the RMU is ready for digital substations, offering real-time data and remote control capabilities.

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Industry-Leading Advantages of PINEELE RMU

• Compliance with GB3906 and IEC298
• Flexible breaker configurations for various operational needs
• SF₆ and air-insulated dual structure for compactness and safety
• Protection against seismic activity, humidity, and pollution
• Meets growing demand for smart and green grid infrastructure

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Frequently Asked Questions (FAQ)

1. What makes the PINEELE XGN2-12 Ring Main Unit ideal for urban distribution networks?

The compact and modular design of the PINEELE Ring Main Unit makes it perfect for tight urban spaces where traditional switchgear systems are too large. Its SF₆ insulation, high protection class, and maintenance-free design reduce installation costs and long-term operational challenges.

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2. Can the PINEELE RMU be integrated into smart grid systems?

Yes. The PINEELE XGN2-12 Ring Main Unit is designed with sensor interfaces and intelligent relays, supporting full automation, remote diagnostics, and predictive maintenance features, all crucial for smart grid integration.

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3. How does the PINEELE Ring Main Unit ensure operational safety?

Safety is ensured through mechanical interlocks, IP-rated enclosures, and five-prevention logic, which prevents unsafe operations such as opening a live circuit or misconfiguring the grounding mechanism.

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Future-Oriented Energy Distribution Solutions

As power grids shift towards renewable energy, digital monitoring, and space-saving infrastructure, the demand for Ring Main Units that are both technologically advanced and scalable continues to grow. The PINEELE XGN2-12 RMU is engineered to meet these challenges head-on, offering utilities, industries, and municipalities a powerful tool for sustainable and smart energy distribution.