Introduction
The HXGN17-12 Ring Main Unit (RMU) is a compact, high-performance medium voltage switchgear designed for use in power distribution systems up to 12kV. It provides a reliable, fully insulated, and fully enclosed switching solution, ensuring safe and efficient operation in industrial, commercial, and utility applications.
This RMU is widely used in urban and rural power grids, industrial plants, commercial centers, railways, substations, and infrastructure projects where continuous power supply and compact design are essential.
Key Features
- Compact & Modular Design: Small footprint, making it ideal for urban substations and space-constrained installations.
- High Reliability: Fully insulated, fully enclosed structure, and maintenance-free operation.
- Enhanced Safety: Arc-resistant design with vacuum load switch technology to improve operational safety.
- Flexible Configurations: Can be configured for ring network or radial power distribution.
- Long Electrical Life: Designed for high operational endurance, ensuring long-term performance with minimal maintenance.
Working Conditions
To ensure the best performance and longevity, the HXGN17-12 RMU is designed to operate under the following environmental conditions:
| Parameter | Specification |
|---|---|
| Ambient Temperature | -25°C to +40°C |
| Altitude | ≤ 1000m |
| Relative Humidity | Daily avg. ≤ 95%, Monthly avg. ≤ 90% |
| Seismic Resistance | Up to Magnitude 8 |
| Environmental Conditions | No fire, explosion risk, corrosive gas, or heavy pollution |
Technical Specifications
General Electrical Specifications
| Parameter | Unit | FN12-12 | FZN25-12 |
|---|---|---|---|
| Rated Voltage | kV | 12 | 12 |
| 1-Min Frequency Withstand Voltage | kV | 42 (to ground), 48 (isolation breaks) | 42 (to ground), 48 (isolation breaks) |
| Lightning Impulse Voltage (Peak) | kV | 75 (to ground), 85 (isolation breaks) | 75 (to ground), 85 (isolation breaks) |
| Rated Frequency | Hz | 50 | 50 |
| Rated Current | A | 630 | 630 |
| Electrical Life at Rated Current | Cycles | ≥100 | ≥100 |
| Open No-Load Transformer Capacity | kVA | 1250 | 1250 |
| Rated Stabilizer | kA/S | 20/4, Earth Switch 20/2 | 20/4, Earth Switch 20/2 |
| Rated Dynamic Stabilizing Current (Peak) | kA | 50 | 50 |
| Rated Short Circuit Closing Current (Peak) | kA | 50 | 50 |
| Fuse Rated Current | A | 125 | 125 |
| Rated Transfer Current | A | 870 | 870 |
| Rated Short-Circuit Opening Current | kA | 20 | 20 |
| Matching Fuse Type | – | S□LAJ-12 | S□LAJ-12 |
| Mechanical Life | Cycles | 2000 | 10000 |
| Auxiliary Circuit 1-min Frequency Withstand Voltage | kV | 2 | 2 |
| Electric Actuator Working Voltage | V | AC/DC 220, 110 | AC/DC 220, 110 |
| Protection Grade | – | IP2X | IP2X |
Installation & Mounting Dimensions
Standard Dimensions (mm)
| W | D | H |
|---|---|---|
| 600 | 900 | 2000 |
| 650 | 900 | 2000 |
| 700 | 900 | 2000 |
| 800 | 900 | 2000 |
Installation Diagram & Components
The HXGN17-12 RMU consists of various functional compartments and key components:
- Instrument Door: Houses control instruments and metering units.
- Instrumentation: Includes meters and protective relays.
- DXN Display: Displays operational status.
- Nameplate: Identification label with product details.
- Operating Mechanism: Switchgear control section.
- Lower Door: Provides access for maintenance.
- Analog Plate: Displays schematic representation.
- Door Lock: Enhances security.
- Load Switch: Vacuum switch mechanism.
- Center Divider: Structural reinforcement.
- Skeleton: Structural frame.
- Current Transformer: Measures current flow.
- Cable Holder: Supports cable routing.
- Relay Compartment: Houses protective relay units.
Ordering Information
When placing an order for the HXGN17-12 Ring Main Unit, the following technical data should be provided:
- Main Wiring Scheme Number: Define purpose and system diagram.
- Rated Voltage & Current: Specify the operational voltage.
- Short Circuit Breaking Capacity: Required fault-handling capability.
- Room Layout Plan: Space arrangement details.
- Protection & Control Requirements: Include schematic diagrams.
- Environmental Considerations: For special conditions.
- Custom Requirements: Any additional configurations.
Applications of HXGN17-12 Ring Main Unit
The HXGN17-12 RMU is ideal for medium-voltage power distribution networks and provides a safe and efficient solution in:
- Urban & Rural Power Distribution: Used in industrial and commercial electrical networks.
- Renewable Energy Projects: Suitable for solar and wind power stations.
- Underground & Indoor Substations: Compact and enclosed for confined spaces.
- Railway & Metro Networks: Used in train stations and underground metro networks.
- Industrial Plants & Mining: Essential for factories, refineries, and mining operations.
Advantages of HXGN17-12 RMU
- Compact Design – Small footprint, saving installation space.
- Fully Insulated & Sealed – No exposure to dust, moisture, or pollutants.
- Low Maintenance – Minimal servicing required over its lifetime.
- Fast & Easy Installation – Preassembled units ensure quick deployment.
- Long Lifespan – Durable materials for extended operational life.
- Safe & Reliable – Built-in arc-proof and fault-handling mechanisms.
- Customizable Configurations – Adaptable for various network requirements.
The HXGN17-12 Ring Main Unit (RMU) is a state-of-the-art medium voltage switchgear solution designed for modern power distribution networks. It offers reliable performance, compact design, and enhanced safety features, making it an ideal choice for utility providers, industrial facilities, and renewable energy projects.
With its versatile configurations, robust vacuum load switch technology, and fully insulated enclosure, the HXGN17-12 RMU delivers exceptional efficiency and long-term reliability in medium voltage power distribution applications.
