XGN3.3 Air Insulated Switchgear

The XGN3.3 3.3kV air-insulated ring main unit is a compact distribution equipment designed for low-voltage distribution network terminals and small industrial scenarios. It utilizes dry air as the insulating medium, eliminating the need for greenhouse gases such as SF6, thus combining environmental friendliness with cost-effectiveness. The equipment boasts a compact overall structure and small size, fitting into narrow installation spaces. Its core functions include ring main power supply, terminal power supply, and fault isolation for 3.3kV voltage level distribution networks. It allows for flexible combinations of load switches and fuses, meeting the basic needs of small and medium-sized users for power supply reliability. It is widely suitable for scenarios where installation space is limited and high environmental standards are required.

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Features

1. Extremely compact design:

The cabinet volume is reduced by more than 30% compared to traditional equipment of the same voltage level, allowing it to be directly embedded into small distribution rooms, outdoor box-type substations, and narrow corridor interlayers, significantly reducing the cost of installation space occupation.

2. Green and environmentally friendly features:

Utilizing air insulation technology, there is no risk of SF6 gas leakage, zero greenhouse gas emissions, fully complying with current environmental policies, and no need for additional gas recovery and treatment equipment.

3. Easy operation and maintenance:

The modular design ensures high universality of components. Daily inspections only require checking the appearance and insulation status. In case of fault maintenance, modules can be quickly replaced, reducing operation and maintenance costs by over 40%.

4. Stable adaptation to low-voltage scenarios:

The circuit design is optimized for the characteristics of 3.3kV low-voltage distribution networks, featuring strong anti-interference capability, adaptability to fluctuating load scenarios such as rural distribution networks and small factories, and a low failure rate.

Execution standards: GB/T 1985.1-2014, IEC 62271-200; Rated current: 630A-1250A; Short-circuit breaking current: 16kA-25kA; Protection level: IP4X (outdoor type IP54); Installation method: indoor wall-mounted, outdoor box-type integrated installation; Optional configurations: electric operating mechanism, remote measurement and control module, fault indicator.

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Specification

No.	Name	Unit	Value
1	Rated Voltage	kV	3.3
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	10/12
13	Lightning Impulse Withstand Voltage (Peak) – Phase-to-Phase & Phase-to-Earth / Isolation Break	kV	20/23
14	1min Power Frequency Withstand Voltage of Secondary Circuit	kV	2
15	Protection Class		IP3X

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FAQs

What is the core difference between a 3.3kV ring main unit and a 400V distribution board?

The former is suitable for the 3.3kV voltage level at the end of medium and low voltage distribution networks, focusing on looped network power supply and fault isolation, with a higher insulation level; the latter is targeted at low voltage power distribution, focusing on load distribution. The two differ completely in voltage adaptation, insulation standards, and application scenarios.

Can the equipment be used in outdoor low-temperature environments?

Outdoor products are equipped with a cold-proof sealing structure, allowing stable operation in an environment ranging from -40℃ to +40℃. No additional heating device is required in low temperature environments, making them suitable for use in cold northern regions.

Related Applications

Rural distribution network transformation: The rural distribution network is scattered and extensive, with limited installation space, and the requirements for environmental protection are gradually increasing. This equipment can be embedded into small village-level distribution rooms to solve the problem of power supply connection for scattered loads in rural areas. At the same time, it can adapt to the humid and dusty outdoor environment in rural areas, reduce maintenance frequency, and ensure stable daily electricity supply for villagers.

Small industrial plants: For small plants such as food processing factories and light industry workshops, where production loads are relatively stable but installation space is limited, equipment can be directly installed in the corner distribution room of the plant to facilitate the transition from 3.3kV incoming lines to low-voltage outgoing lines. The modular design allows for flexible expansion based on production capacity, and eliminates the risk associated with SF6 gas, meeting the safety and environmental protection requirements of the plant.

Power distribution upgrade for old residential areas: The original power distribution space in old residential areas is narrow and cannot accommodate large equipment. This equipment can replace traditional bulky power distribution units, optimize the residential area’s distribution network structure, and enhance power supply reliability. At the same time, it avoids the potential impact of SF6 gas on residents’ living environment and meets the environmental and spatial requirements of residential area renovation.

XGN3.3 Air Insulated Switchgear