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XGN20
XGN20 Air Insulated Switchgear
The 20kV air-insulated ring main unit is a core hub equipment for high-voltage distribution networks. It is compatible with high-voltage distribution networks in some domestic cities, large energy bases, and 20kV distribution systems in some European countries. Using dry air as the insulating medium, it integrates core technologies such as high-voltage insulation enhancement, intelligent dispatch linkage, and high-capacity current flow. It possesses functions such as main line power supply, ring network interconnection, and new energy grid connection. The equipment combines high-voltage performance with compact design, enabling centralized control of high-voltage distribution networks within limited spaces. It is the preferred equipment for upgrading high-voltage distribution networks and large energy projects.
Features
1. Adequate high-voltage insulation redundancy:
Utilizing multiple layers of insulating barriers and reinforced insulating materials, the insulation strength is increased by 20% compared to standard requirements, effectively resisting high-voltage arcs and voltage surges, and preventing insulation breakdown failures.
2. Intelligent scheduling and deep integration:
It supports seamless docking with power grid dispatching systems and new energy control platforms, and possesses functions such as load forecasting, power quality analysis, and remote precise regulation and control, enabling unmanned operation and maintenance of high-voltage distribution networks.
3.Compact high-voltage layout:
Optimized design through vertical layering and horizontal zoning, resulting in a cabinet volume 60% smaller than traditional equipment of the same voltage level. It can be installed in urban underground distribution rooms and compact distribution rooms in energy bases.
4.Full lifecycle cost optimization:
The core components have a service life of over 25 years and a long maintenance-free period. Compared to SF6 high-voltage equipment, it eliminates the costs of gas procurement and recycling, reducing the full lifecycle cost by over 30%.
Executive standards: GB/T 3906-2020, IEC 62271-201, EN 50027; Rated current: 2000A-4000A; Short-circuit breaking current: 31.5kA-40kA; Protection level: IP4X (outdoor type IP55); Installation methods: indoor floor-mounted, embedded in underground distribution room, outdoor prefabricated; Optional configurations: power quality monitoring module, intelligent energy storage operating mechanism, grid dispatching linkage terminal.
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Specification
| No. | Name | Unit | Value |
| 1 | Rated Voltage | kV | 20 |
| 2 | Rated Frequency | Hz | 50 |
| 3 | Rated Current of Main Busbar / Maximum Rated Current of Fuse | A | 630, 125 |
| 4 | Rated Short-time Withstand Current of Main Circuit & Grounding Circuit | kA/S | 20, 3 |
| 5 | Rated Peak Withstand Current of Main Circuit & Grounding Circuit | kA | 50 |
| 6 | Rated Short-circuit Making Current of Main Circuit & Grounding Circuit | kA | 50 |
| 7 | Full Capacity Opening Times of Load Switch | times | 100 |
| 8 | Fuse Breaking Current | kA | 31.5 |
| 9 | Rated Closed-loop Breaking Current | A | 630 |
| 10 | Rated Transfer Current | A | 1600 |
| 11 | Mechanical Life | times | 2000 |
| 12 | 1min Power Frequency Withstand Voltage (Peak) – Phase-to-Phase & Phase-to-Earth / Isolation Break | kV | 50/60 |
| 13 | Lightning Impulse Withstand Voltage (Peak) – Phase-to-Phase & Phase-to-Earth / Isolation Break | kV | 125/145 |
| 14 | 1min Power Frequency Withstand Voltage of Secondary Circuit | kV | 2 |
| 15 | Protection Class | IP3X |
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FAQs
Compared to SF6 high-voltage cabinets, is there a difference in insulation performance between 20kV air-insulated ring main units?
There is no significant difference. The reinforced insulation structure and optimized layout ensure that the insulation performance meets standards, and the air insulation poses no leakage risk. It is easier to operate and maintain, making it more advantageous in urban distribution networks and energy projects.
Can the equipment adapt to the fluctuating load of large-scale new energy grid integration?
It is adaptable, possesses load regulation and anti-fluctuation capabilities, and can respond to photovoltaic energy in real time.
Related Applications
Urban High-Voltage Distribution Network Hub: In some first-tier cities in China, the high-voltage distribution network is upgraded to a 20kV voltage level. The equipment can be installed in urban underground distribution rooms, with a compact design that fits into limited underground spaces. The intelligent dispatching and linkage function can be integrated with the municipal distribution network automation system, enabling rapid handling of main line faults and optimization of load distribution. This ensures stable high-voltage power supply in urban core areas and high-rise buildings, facilitating the digital upgrade of urban distribution networks.
Large-scale pumped storage power station: The high-voltage distribution network of a pumped storage power station needs to balance the requirements of large-capacity power supply and flexible regulation. The 20kV ring main unit can serve as the core equipment for the high-voltage distribution network within the power station, enabling power access, load distribution among generating units, and rapid fault isolation. The intelligent linkage function can coordinate with the power station dispatching system to adjust the power supply mode according to changes in grid load, ensuring continuous high-voltage power supply during the pumping and generating processes, and enhancing the operational efficiency of the power station.
High-voltage distribution network in European industrial parks: Some industrial parks in Europe adopt a 20kV distribution network standard. The equipment can be adapted to EN standards and local grid requirements. Its large-capacity current-carrying capacity can meet the high-voltage power supply needs of large industrial equipment within the park. The compact design fits the limited distribution space in European industrial parks, while its environmental protection features align with Europe’s strict environmental policies, facilitating efficient production in overseas industrial parks.
