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XGN22
XGN22 Air Insulated Switchgear
The 22kV air-insulated ring main unit is a dedicated equipment for high-voltage distribution networks. It is primarily suitable for domestic ultra-high voltage (UHV) supporting projects, large chemical parks, and 22kV distribution systems in some European and Australian countries. Utilizing air as the insulating medium, it integrates core technologies such as UHV compatibility, explosion-proof and corrosion-resistant design, and intelligent monitoring. It possesses functions like high-voltage distribution network segment control, fault clearance, and grid connection of renewable energy. The equipment’s insulation strength and safety redundancy have been significantly enhanced, allowing it to operate stably under high-voltage, high-risk, and complex conditions. It serves as a crucial device connecting high-voltage distribution networks with UHV systems.
Features
1.UHV (Ultra High Voltage) compatibility:
The optimized insulation structure and electrical parameters can accommodate voltage fluctuations and load impacts of the UHV system, ensuring seamless integration with UHV converter stations and stable operation of the supporting distribution network.
2.Safety enhancement for high-risk scenarios:
The adoption of explosion-proof cabinet structure, arc flash protection system, and fault pressure relief device allows for compatibility with Zone 1 explosion-proof areas. The cabinet undergoes anti-corrosion reinforcement treatment, enabling it to withstand corrosion from chemical media.
3.Multi-dimensional intelligent monitoring:
Equipped with built-in monitoring modules for insulation status, partial discharge, temperature and humidity, it can provide real-time alerts for potential equipment failures and supports integration with ultra-high voltage dispatch systems and campus security systems.
4.Strong impact resistance:
The cabinet body adopts high-strength steel structure and shock absorption design, which can withstand external impacts such as earthquakes and equipment vibrations. The core components are made of aging-resistant and fatigue-resistant materials to ensure long-term stable operation under high-pressure conditions.
Executive standards: GB/T 3906-2020, IEC 62271-201, AS/NZS 3439.1; Rated current: 2000A-4000A; Short-circuit breaking current: 31.5kA-40kA; Protection level: IP54 (explosion-proof IP65); Installation methods: indoor explosion-proof installation, outdoor corrosion-resistant installation, UHV integrated installation; Optional configurations: partial discharge monitoring module, explosion-proof electric operating mechanism, UHV linkage control unit.
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Specification
| No. | Name | Unit | Value |
| 1 | Rated Voltage | kV | 22 |
| 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
How can the compatibility of the 22kV ring main unit with the UHV system be ensured in UHV supporting projects?
Through parameter customization and interface adaptation, the insulation strength and control logic are optimized. Equipped with a dedicated linkage module, it can respond to UHV dispatching instructions in real-time and also features overvoltage and overcurrent protection functions to avoid system interference.
How to deal with corrosive media when equipment is used in a chemical industrial park?
The cabinet body is constructed using a combination of fluorocarbon spray coating and stainless steel materials, with anti-corrosion sealing kits installed at key interfaces. The internal components have undergone anti-corrosion treatment, enabling them to withstand corrosive media such as acids, alkalis, and chemical vapors, thereby extending the service life of the equipment.
Related Applications
UHV supporting distribution network project: The supporting high-voltage distribution network for UHV converter stations and substations must possess high adaptability and stability. The 22kV ring main unit can serve as the core control equipment for the supporting distribution network, facilitating the connection between the UHV system and the regional distribution network. The multi-parameter monitoring function can provide real-time feedback on equipment operating status, and, in conjunction with the UHV dispatching system, optimize the power supply mode, ensuring the overall stable operation of the UHV project and reducing the risk of power supply interruptions.
Domestic large-scale chemical industrial parks: such as petrochemical and coal chemical industrial parks, the high-voltage distribution network needs to meet explosion-proof and corrosion-resistant requirements. The 22kV ring main unit, designed for explosion-proof and corrosion-resistant purposes, can be installed in the distribution room of high-risk areas within the park. The flameproof and arc protection system can prevent safety accidents caused by internal faults. It is integrated with the park’s security and gas detection systems, automatically cutting off power when dangerous gases are detected to exceed standards, ensuring the safety of high-voltage power supply for chemical production.
High-voltage distribution network in Australian cities: Some cities in Australia adopt a 22kV distribution network standard and have strict requirements for equipment environmental friendliness and impact resistance. The equipment can comply with AS/NZS standards, and its earthquake and storm resistance design can cope with Australia’s complex climate. Its air insulation characteristics align with local environmental policies, making it suitable for installation in urban distribution network hubs. It enables intelligent regulation and rapid fault handling of the high-voltage distribution network, ensuring stable electricity supply for urban residents and industrial and commercial use.
