Introduction: What Is the PINEELE XGN15-12 Ring Main Unit?
The PINEELE XGN15-12 Ring Main Unit (RMU) is an advanced air-insulated medium voltage switchgear system designed for 12/24kV power distribution applications. Built on years of engineering expertise, this RMU combines SF₆ load switches, fuse combinations, and a vacuum load switch mechanism to 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, including power grid upgrades, mining operations, high-rise buildings, and public utilities. Designed for both loop and terminal power supply configurations, it can also be deployed inside pre-fabricated substations.
The PINEELE Ring Main Unit complies with the IEC 60420 international 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, the PINEELE XGN15-12 RMU is built to support your operational goals.
Key Features of PINEELE XGN15-12 Ring Main Unit
Advanced Modular Design
- Each unit of the Ring Main Unit can be freely expanded or combined to meet various power system configurations, offering exceptional flexibility and customization.
Dual Compartment Layout
- The cabinet is divided into upper 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.
- The three-position SF₆ rotary load switch is paired with mechanical interlocks for Five-Prevention Safety .
Integrated Low-Voltage Control Room
- The compact control compartment supports a wide range of accessories: trip coils, metering instruments, relay protection, capacitive voltage displays, and motorized operation units.
Environmental & Operating Conditions
To ensure consistent operation and durability, the PINEELE XGN15-12 Ring Main Unit is 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 |
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
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 switch made from epoxy resin insulation.
- Can include gas density meter with alarms upon 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.
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
Frequently Asked Questions (FAQ)
1. What are the key benefits of using the PINEELE XGN15-12 Ring Main Unit?
The PINEELE Ring Main Unit offers exceptional modular flexibility, high safety standards, and long service life. Its SF₆ insulation, mechanical interlocks, and smart control compatibility make it an ideal choice for future-ready power distribution.
2. Is the PINEELE RMU suitable for smart grid and automation?
Absolutely. It supports installation of remote control terminals, motorized switchgear, and telecontrol units, allowing real-time automation and intelligent energy management.
3. What is the service life and maintenance requirement for this Ring Main Unit?
With a design life exceeding 30 years, the PINEELE RMU offers minimal maintenance due to sealed SF₆ insulation and durable mechanical parts. The operating mechanism and electrical components are rated for thousands of cycles under standard use.
Smart Infrastructure Ready – Future-Proofing with RMU Technology
The PINEELE XGN15-12 Ring Main Unit is engineered not only for today’s infrastructure but also for the smart, digital, and resilient grids of tomorrow. From urban utilities to renewable energy networks, this RMU delivers unmatched control, safety, and versatility.
