GTXGN-12 Solid Insulated Ring Main Unit
Ring Main Unit GTXGN-12 Solid Insulated Ring Main Unit The GTXGN-12 Solid Insulated Ring Main Unit (RMU) is an innovative, environmentally friendly, and fully sealed
GTXGN-12 Solid Insulated Ring Main Unit
GTXGN-12 Solid Insulated Ring Main Unit
The GTXGN-12 Solid Insulated Ring Main Unit (RMU) is an innovative, environmentally friendly, and fully sealed power distribution unit. Designed and developed by Zoliov, this RMU eliminates the use of SF6 gas, offering a reliable and maintenance-free solution for medium-voltage electrical networks. With its advanced solid insulation technology, the GTXGN-12 ensures safe operation in harsh environmental conditions, making it ideal for applications in substations, industrial sites, and high-rise buildings.
Key Features:
Visible Isolation Cutout: The front of the unit has clear isolation cutout windows to easily observe the isolator’s positions (open, closed, and grounded), enhancing safety during maintenance and ensuring that operators can visually confirm the switch positions.
Pressure Relief Design: Equipped with an internal arc pressure relief valve, this unit releases pressure during an internal arc event, directing the harmful gas to a safe area, such as a cable trench, to prevent potential injury to the operator.
Eco-friendly: The GTXGN-12 RMU uses no SF6 gas, making it an environmentally responsible choice. This unit also reduces energy consumption by employing minimal connection points in the primary circuit, lowering operating costs.
Enhanced Arc Extinguishing: The unit features an improved arc-extinguishing chamber, using copper-chromium contact materials and longitudinal magnetic field contacts to provide better short-circuit breaking capacity, longer service life, and superior stability compared to traditional arc-extinguishing systems.
Why choose the GTXGN-12 solid insulation ring main unit cabinet
The GTXGN-12 Ring Main Unit (RMU) is an advanced, fully-sealed, and eco-friendly solution for medium-voltage electrical distribution networks. It includes several configurations, such as V (circuit breaker), C (load switch), and F (combined electrical components), providing flexibility in design and easy expansion to meet evolving operational needs. This RMU is ideal for use in both urban and industrial environments, providing superior safety, reliability, and reduced maintenance requirements.
Product Advantages
Completely Eco-Friendly: The unit uses no SF₆ gas at all, eliminating greenhouse gas concerns, and its materials are recyclable.
Fully Insulated and Fully Sealed: Integral epoxy resin casting provides protection up to IP67, with excellent resistance to condensation, pollution, and aging.
High Safety: Vacuum arc extinguishing, phase-to-phase isolation, shielding and grounding, plus a complete interlocking system help prevent explosion, electric shock, and fault propagation.
Maintenance-Free: With no gas tank and no gas leakage risk, the unit is suitable for harsh environments such as -40°C to 65°C, high humidity, high altitude, and coastal areas.
Modular Design: Circuit breaker, load switch, and other functional units can be freely combined, with compact size and convenient installation.
Long Service Life: The vacuum interrupter and copper-chromium contacts provide long electrical and mechanical life with stable operation.
Operating Conditions
Temperature: The unit operates effectively in temperature ranges from -25°C to +55°C, ensuring reliable performance in extreme conditions.
Altitude: Suitable for installation at altitudes up to 4000 meters.
Humidity: It can operate in environments with relative humidity levels of up to 90% at +20°C, with allowances for higher humidity at lower temperatures.
Environmental Considerations: It should be used in environments free from corrosive gases, severe vibrations, and shock hazards. The unit is also built to prevent condensation that may occur due to changes in humidity.
Application
The GTXGN-12 solid insulation ring main unit cabinet is mainly used in urban power grids, industrial and mining enterprises, rail transit, wind power and photovoltaic power generation, as well as harsh environments such as mountainous areas and coastal regions. It serves as power distribution, control, and protection equipment for medium-voltage power systems.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| GTXGN-12 Solid Insulated Ring Main Unit | G: | AC high-voltage switchgear |
| T: | Solid insulation | |
| X: | Box-type modular structure | |
| G: | Fixed installation | |
| N: | Indoor type | |
| 12: | Rated voltage 12kV |
Technical Parameters
| Item | Parameter |
|---|---|
| Rated Voltage | 12 kV |
| Rated Frequency | 50 Hz |
| Rated Current | 630 A / 1250 A |
| Rated Short-Circuit Breaking Current | 20 kA / 25 kA / 31.5 kA |
| Rated Short-Time Withstand Current | 20 kA / 25 kA / 31.5 kA / 1 s |
| Rated Peak Withstand Current | 50 kA / 63 kA / 80 kA |
| Insulation Medium | Epoxy resin solid insulation, SF₆-free |
| Protection Level | IP67 |
| Mechanical Life | ≥ 10,000 operations |
| Ambient Temperature | -40°C to +65°C |
| Altitude | ≤ 3000 m |
| Standards | GB/T 3906, GB/T 11022 |
Overall and mounting dimensions(mm)（Reference）
Custom GTXGN‑12 Solid Insulated Ring Main Unit Solutions for Your Project
(The values can be customized according to local project requirements.)
If you have specific requirements for the parameters, structure, or configuration of the GTXGN‑12 solid insulated ring main unit (RMU), please contact us. Our team of account managers, technical engineers, and product consultants will assess your power distribution design, rated specifications, installation conditions, control needs, and project timeline to provide a tailored solution that fits your application scenario with precision.
We can customize rated voltage levels (typically 12 kV for ring network applications), rated current capacity, insulation structure, modular unit arrangement (e.g., V‑unit, C‑unit, or F‑unit configuration), intelligent control and protection equipment, enclosure protection grade, and other key design details to ensure reliable and safe performance in your medium‑voltage distribution network. The GTXGN‑12 solid insulated RMU features full insulation and full enclosure with epoxy resin encapsulation of live components, eliminating SF₆ gas and reducing maintenance requirements while enhancing environmental performance. This makes it particularly suitable for demanding environments—such as urban distribution systems, substations, industrial facilities, and renewable energy installations—where compact size, high reliability, and long service life are essential.
FAQ
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