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China DR-GTXGN-12 Solid Insulation Ring Main Unit - Eco-Friendly Switchgear Suppliers & Factory
Model and Meaning
Work Environmental Conditions
- It is ideal for indoor or outdoor use.
- Ambient air temperature: Indoor -10°C to +25°C, outdoor -60°C to +60°C.
- Relative air humidity: Daily average is no more than 95%, monthly average is no more than 90%.
- Altitude is no more than 3000m.
- Ambient air is free from any pollution of dust, water vapor, salt fog, corrosive gases, or flammable gases; the outdoor type can be used in severe environmental conditions.
- No severe vibration in the area to install, and the earthquake intensity is no more than 8 ML.
* When the work environmental conditions cannot meet the requirements above, the user shall consult with the manufacturer.
Safety and Protection
Insulation Knife Visual Cutout
With an obvious visible cutout window in front of the cabinet, it is convenient and safe for the personnel on site to check the three positions such as the insulation closing position, insulation breaking position and grounding closing position and confirm the insulation knife position.
Pressure Relief Design
Internal arcing pressure valve; when any arcing occurs in the product, the pressure will be relieved from the pressure relief valve and the arcing will be discharged to the cable trench to prevent any injury to the operator.
Environment-Friendly & Green
With environment-friendly materials in design, SF6 gas isn't used as the arc extinguishing medium and insulation, without pollution to the environment. The primary circuit has minimum-contact design to ensure low energy consumption in operation.
Execution Standards
- IEC62271-1-2007 "High-voltage switchgear and controlgear Part-1 Common specifications"
- IEC620071-200-2003 "AC metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV"
- GB3906-2006 "Alternating-current metal-enclosed switchgear and controlgear for rated voltage above 3.6kV and up to and including 40.5kV"
- GB/T11022-2011 "Common specification for high-voltage switchgear and controlgear standards"
- GB1984-2014 "High-voltage alternating-current circuit-breakers"
- GB1985-2014 "High-voltage alternating-current disconnectors and earthing switches"
- GB3804-2004 "High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5kV"
- DL/T404-2007 "Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV"
- DL/T593-2016 "Common specification for high-voltage switchgear and controlgear standards"
- Q/GDW730-2012 "Specifications for 12kV solid-insulated ring main units"
- DL/T402-2016 "High-voltage alternating-current circuit-breakers"
Main Technical Parameters (Whole Switchgear)
| Name | Unit | Parameter | |
| Rated voltage | kV | 12 | |
| Rated current | A | 630 | |
| Rated short-time withstand current (4s) | kA | 25 | |
| Rated peak withstand current | kA | 50 | |
| Rated short-circuit closing current (peak) | kA | 50 | |
| Rated active load breaking current | A | 630 | |
| Rated closed loop breaking current | A | 630 | |
| Rated cable charge breaking current | A | 10 | |
| Rated breaking transfer current of combined appliances | A | 3700 | |
| 1min power frequency withstand voltage | Phase-to-phase, phase-to-ground, vacuum breaking | kV | 42 |
| Insulation breaking | kV | 48 | |
| Lightning impact withstand voltage | Phase-to-phase, phase-to-ground, vacuum breaking | kV | 75 |
| Insulation breaking | kV | 85 | |
| Mechanical life | Circuit breaker | Time | 10000 |
| Insulation knife, grounding knife | Time | 3000 | |
| Protection grade | IP4X | ||
| Shell protection grade | IP4X | ||
| Partial discharge | pC | ≤20 (Measured at 1.2Ur) | |
Frequently Asked Questions (FAQ)
What are the operational temperature limits for this switchgear?
The equipment is designed for both indoor and outdoor environments. The ambient air temperature limits are -10°C to +25°C for indoor use, and -60°C to +60°C for outdoor installations.
How does the visual cutout design improve operator safety?
It features a visible cutout window on the front panel, allowing operators to easily inspect and confirm the insulation knife's position across three states: insulation closing, insulation breaking, and grounding closing.
What happens during an internal arcing fault?
The switchgear is equipped with an internal arcing pressure valve. In the event of an arc, the pressure is safely relieved through this valve and directed into the cable trench, protecting operators from injury.
Is SF6 gas used in this switchgear?
No, this switchgear is environmentally friendly and does not use SF6 gas for insulation or arc extinguishing. It also utilizes a minimum-contact design for low energy consumption during operation.
What is the mechanical life expectancy of the components?
The circuit breaker has a mechanical life of 10,000 operations, while the insulation knife and grounding knife are rated for 3,000 operations.
What protection rating does the switchgear housing offer?
Both the internal components and the outer shell of the switchgear meet the IP4X protection grade standards.