YM-GTXGN-12 Ring Main Unit (RMU) Technical Description The YM-GTXGN-12 Ring Main Unit (RMU) is a compact, gas-insulated switchgear solution designed for medium-voltage (MV) power distribution networks, typically rated at 12 kV. It is widely used in urban and industrial applications to ensure reliable power supply, fault isolation, and network flexibility. The unit integrates multiple functions, including load breaking, fault current interruption, and circuit protection, within a single, modular enclosure. Design and Construction The RMU features a robust, sealed stainless-steel or aluminum enclosure filled with SF₆ (sulfur hexafluoride) gas, which provides excellent insulation and arc-quenching properties. This design minimizes maintenance requirements and enhances operational safety by preventing external environmental contamination. The compact footprint makes it suitable for space-constrained installations such as underground networks, substations, or renewable energy plants. Key Components 1. Load Break Switches (LBS) – Enable safe switching of normal load currents. 2. Vacuum Circuit Breakers (VCB) – Provide reliable interruption of fault currents, ensuring system protection. 3. SF₆ Insulated Busbars – Offer high dielectric strength and reduced phase-to-phase clearances. 4. Protection Relays – Support overcurrent, earth fault, and other protective functions. 5. Earthing Switches – Ensure safe maintenance by grounding disconnected sections. Operational Features - Modularity: Configurable with 2 to 6 feeder units, allowing customization for radial or ring networks. - Remote Monitoring: Compatible with SCADA systems for real-time diagnostics and automation. - Safety: IP67-rated enclosure, mechanical interlocks, and pressure-relief devices for hazard prevention. Applications - Secondary substations - Industrial power distribution - Renewable energy integration (e.g., solar/wind farms) - Urban grid expansions Advantages - Reliability: SF₆ insulation ensures stable performance in harsh conditions. - Low Maintenance: Sealed design reduces wear and external interference. - Efficiency: Compact size lowers installation costs and space requirements. In summary, the YM-GTXGN-12 RMU is a versatile, high-performance solution for modern power distribution, combining safety, efficiency, and adaptability for diverse grid applications.