SRM6-12 Gas-Insulated Ring Main Unit

Product Composition

• The GoWatron SRM6-12 gas-insulated ring main unit features a well-layered structural design with five independent core modules. The modular and separated structure delivers stable equipment performance and greatly facilitates routine inspection and maintenance.

(1) High-Voltage Sealed Gas Tank Module (Primary Core Component)

• Fabricated from 304 stainless steel via laser seamless welding, the fully enclosed gas tank achieves IP67 protection class and is filled with high-purity SF₆ insulating gas. The rated filling pressure (relative pressure at 20°C) is XX bar, and the minimum functional pressure is XX bar. The internal assembly integrates the main busbars, three-position switches, vacuum circuit breakers, earthing switches, current transformers and voltage transformers. All live parts are completely isolated from the external environment to prevent insulation failures, serving as the core safety component of the entire equipment.

(2) Operating Mechanism Module

• Equipped with high-performance spring operating mechanism, the device supports manual operation as standard, with optional electric motor actuation for remote closing and tripping control. A full set of mandatory mechanical interlocks complies with standard five-prevention safety requirements. Visual position indicators clearly display switch closing, opening and earthing statuses, fundamentally eliminating manual misoperation risks.

(3) Metal Enclosure Module

• The cabinet is made of high-quality cold-rolled steel sheet with electrostatic powder coating, offering robust corrosion resistance and high mechanical impact resistance. The standard mechanical impact protection grade reaches IK07. The interior is independently divided into cable compartment, operating compartment and secondary instrument compartment. Standard busbar connection interfaces and mounting spaces are reserved, ensuring neat structure and strong installation compatibility.

(4) Secondary Control and Monitoring Module

• Integrated with voltage presence indicators, SF₆ gas pressure monitors, fault passage indicators, protection relays and communication interfaces. Optional accessories include cabinet heaters and temperature and humidity monitoring components. Supporting the IEC 61850 communication protocol, the module realizes real-time equipment status monitoring, fault early warning and intelligent remote operation and maintenance.

(5) Auxiliary Accessories Module

• Consists of metal oxide surge arresters, gas tank pressure relief devices, earthing busbars, cable termination kits, cabinet connecting fittings, door locks and complete installation accessories, ensuring safe overall operation and standardized on-site installation.

Six Core Advantages

• Fully Sealed and Fully Insulated, Adaptable to All Complex Environments: Adopting a 304 stainless steel laser seamless welded gas tank, all primary live parts are completely isolated from the outside world. The equipment operates stably for a long time in humid, salty, dusty and corrosive environments, covering outdoor, underground and coastal application scenarios.
• Modular and Configurable, Strong Application Compatibility: Standard functional modules can be freely combined and assembled to match various primary power distribution schemes such as ring network power supply, line sectioning and transformer protection, meeting diverse grid operating conditions and selection requirements.
• Ultra-Compact Structure, Space-Saving Installation: The highly integrated modular design minimizes cabinet floor space with a lightweight and compact structure, perfectly suitable for prefabricated substations, small distribution kiosks and narrow underground power distribution rooms.
• Complete Mechanical Interlocks, Safe and Reliable O&M: Equipped with standard mandatory mechanical interlocks, gas pressure monitoring, live display and pressure relief protection systems, the equipment eliminates misoperation hazards in all dimensions and fully complies with the IEC 62271-200 safety specification.
• Ultra-Low Maintenance, Extended Service Lifespan: Adopting high-precision seamless welding technology, the annual SF₆ gas leakage rate is controlled below 0.1%. The equipment achieves a design service life of up to 30 years, requiring no gas refilling or regular insulation cleaning under normal operating conditions, which greatly reduces operational and maintenance costs.
• Intelligent Upgrade Support, Compatible with Smart Power Grids: Reserved standard communication interfaces support expansion of intelligent monitoring, fault location and remote measurement and control components. Compatible with IEC 61850 protocol, it realizes primary and secondary equipment integration and meets the automatic operation requirements of modern intelligent distribution networks.

Technical Parameters (Standard and Optional)

• Rated Voltage: 12kV (fixed standard, non-selectable)
• Rated Frequency: 50Hz (standard, 60Hz customizable on request)
• Rated Busbar Current: 630A (standard configuration)
• Rated Short-Time Withstand Current: 20kA/3s (standard); 25kA/3s, 25kA/4s optional
• Insulating Medium: SF₆ Insulating Gas (fixed configuration)
• Rated Filling Pressure (relative pressure at 20°C): XX bar (to be confirmed per design)
• Minimum Functional Pressure: XX bar (to be confirmed per design)
• SF₆ Annual Gas Leakage Rate: ≤0.1%
• Protection Class: Gas Tank IP67, Cabinet Enclosure IP4X (foreign object protection)
• Mechanical Impact Protection Class: IK07 (standard)
• Operating Conditions: Standard type: -25°C to +40°C (compliant with GB/T 3906 and IEC 62271-200); Wide-temperature customized type: -40°C to +55°C (customized for alpine, high-temperature and extreme outdoor environments)
  Altitude: ≤1000m (standard, higher altitude customized available)
• Compliance Standards: GB/T 3906-2020 “3.6 kV~40.5 kV AC Metal-Enclosed Switchgear and Controlgear”; IEC 62271-200 “High-voltage switchgear and controlgear – Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV”

Typical Application Scenarios

• Urban municipal power distribution networks, residential community distribution substations, photovoltaic and wind power renewable energy distribution systems, industrial and commercial parks, data centers, hospitals, rail transit systems, prefabricated substations, coastal and heavily polluted industrial sites, public infrastructure including schools and airports.