Product Overview
The 20kV gas-insulated ring main unit (RMU) is a new generation of fully sealed, fully insulated high-voltage switchgear. Designed for 20kV AC power frequency distribution systems, it is primarily used for ring network power supply, section connection, load distribution, and fault protection in urban power grids, industrial parks, commercial complexes, and new energy power stations. The equipment adopts a sealed gas-filled compartment insulation structure, unaffected by external environmental interference. It reliably performs circuit connection, disconnection, short-circuit and overload protection, effectively enhancing the continuity and safety of power distribution networks. It is a core choice for modern high-voltage distribution systems.
The product strictly adheres to high-voltage power industry standards. It features a compact structure, maintenance-free operation, high safety, strong insulation performance, stable operation, excellent weather resistance, and wide applicability. Suitable for both indoor and outdoor complex working conditions, it is widely used in urban grid renovation, industrial and mining power distribution, photovoltaic and wind power support, and high-end building power distribution.
Operating Conditions
1. Ambient temperature: -40°C to +55°C, resistant to extreme high/low temperatures and daily temperature fluctuations.
2. Altitude: ≤1000m; reinforced insulation types available for high-altitude areas.
3. Relative humidity: ≤95% (at 25°C); fully sealed gas compartment structure prevents moisture and condensation, eliminating internal insulation failures.
4. Installation site: Distribution rooms, inside compact substations, outdoor enclosed cabinets, industrial parks; no violent vibration, strong corrosion, or explosive dust.
5. Protection rating: IP67 for gas compartment, IP30 for enclosure; dustproof, waterproof, anti-pollution, moisture-resistant, with strong anti-environmental interference capability.
6. Installation requirements: Floor-mounted fixed installation; cabinet level and stable with reliable grounding; standard heat dissipation and maintenance clearance reserved.
Technical Parameters
Parameter | Unit | Value |
|---|---|---|
Rated voltage | kV | 20, suitable for 20kV high-voltage distribution systems |
Rated frequency | Hz | 50 |
Rated current | A | 630, suitable for mainstream ring network distribution loads |
Rated short-circuit breaking current | kA | 20, strong fault breaking capacity, reliable action |
Insulation medium | --- | SF6 gas insulation, stable and excellent insulation performance |
Mechanical life | Cycles | ≥5000, withstands frequent operations, reliable operation |
Service life | Years | ≥20 years, sealed compartment with no gas leakage, long-term stable |
Protection rating | --- | IP67 (compartment) / IP30 (enclosure), dustproof, waterproof, anti-condensation |
Product Features
1. Fully insulated, fully sealed design: Core components are completely enclosed in the gas-filled compartment, unaffected by external dust, moisture, or condensation, suitable for harsh and complex conditions.
2. Excellent insulation performance: High-quality SF6 gas insulation provides high withstand voltage, no leakage risk, ensuring safe and stable operation under 20kV high-voltage conditions.
3. Comprehensive fault protection: Equipped with short-circuit, overload, and earth fault protection functions, quickly isolating faulty lines to ensure ring main reliability.
4. Maintenance-free long life: Laser sealing process for the gas compartment results in extremely low gas leakage rate; no frequent maintenance required, significantly reducing operating costs.
5. Compact structure, small footprint: Modular integrated design with small cabinet volume and neat layout, effectively saving distribution space, suitable for confined equipment rooms.
6. Safe and convenient operation: Reliable mechanical interlocking devices prevent incorrect opening/closing; flexible manual and electric operation with high operational safety.
Our Advantages
1. Specialized in the R&D and production of 20kV high-voltage gas-insulated RMUs, with targeted optimization for medium-high voltage ring network distribution conditions, offering strong adaptability.
2. Strict selection of high-quality materials for core components; exquisite gas compartment sealing process; factory testing includes withstand voltage, gas tightness, and mechanical operation.
3. Compliant with State Grid high-voltage equipment standards, with complete qualifications and mature processes, meeting acceptance specifications for urban distribution networks and key industrial projects.
4. Support non-standard customization for incoming/outgoing circuits, intelligent monitoring, and remote communication modules to suit various personalized distribution solutions.
5. Provide full installation and commissioning guidance, gas tightness testing, and long-term after-sales service to ensure long-term stable operation of the equipment.
Ordering Guide
Please provide the following information to ensure accurate matching with operating requirements:
1. Specify the system voltage, rated current, number and configuration of required incoming/outgoing circuits.
2. Confirm the installation scenario and whether special customization for high altitude, heavy pollution, or low temperature is required.
3. Confirm functional requirements: conventional manual type, electric type, intelligent monitoring, and remote communication functions.
4. Confirm whether supporting test reports, installation and commissioning, and full life-cycle after-sales service are required.
