How to choose Transformer Ring Main Unit?
The three insulation methods of Transformer Ring Main Unit are Sf6 gas fully insulated ring main unit, solid insulated ring main unit, and environmentally friendly gas insulated ring main unit. Each of these three ring main units has its own advantages and needs to be selected according to actual needs. I will introduce them one by one.
1. SF6 Gas Ring Main Unit
Insulation and Arc Extinguishing: With SF6 gas as the insulation medium, the insulation strength is 2.5 times that of air and the arc extinguishing capability is excellent.
Sealed Design: Fully Sealed Stainless Steel Air Box with Annual Leakage Rate ≤0.01% for 30 Years Maintenance Free.
Compact structure: 30% smaller volume than solid cabinets, suitable for space-constrained scenarios (like urban underground cable tunnels).
Economic balance: The initial cost is high, but the 30-year operation and maintenance cost is only 60% of that of a solid cabinet.
2. Solid Insulated ring main unit
Insulation system: vacuum pouring process of epoxy resin with fully sealed windings, fire resistance class F (temperature resistance 155℃).
Mechanical strength: 30% improvement in resistance to short circuit, in the test of a subway project in 2024, the winding deformation rate ＜1.5% after withstanding the impact of 25 times the rated current.
Environmental adaptability: IP67 protection rating for long-term operation in - 45℃ freezing cold, humidity 90%.
Zero gas risk: no leakage, no gas monitoring required, meeting the mandatory requirements of the "Code for Fire Protection Design of Buildings" for crowded places.
Rapid deployment: 40% lighter than SF6 cabinets, 60% shorter installation cycle for a shopping mall renovation project.
Insulation aging: partial discharge may occur after long-term operation of epoxy resin, which needs to be tested by partial discharge every 5 years.
3.Safe Gas Ring Main Unit
Environmental compliance: 99.99% less carbon emissions than SF6 cabinet, EU RoHS certified, in line with environmental policy.
Long-life design: The air box is welded by robot laser, and its service life is up to 40 years, which is 33% longer than SF6 cabinet.
Environmentally friendly and pollution-free: The insulating medium of the inflatable cabinet is zero-stage dry air (outsourced) or 99.99% pure N2 according to GB/T8979-2008, and the leakage of the gas will not cause any impact on the external environment, and no recycling treatment is required.
Perfect mechanical interlocking: The operation panel of the inflatable cabinet has perfect five-proof mechanical interlocking function, all interlocking functions have been configured internally, please operate in the order of the operating instructions during operation, very convenient to use.
Our advantages
1. Schneider Business & Partners
2. State Grid Winning Bid Company
3.56 national patents
4. Independent research and development of five-link safety lock
Product Advantage
1. Modular design of ring mesh cabinet
2 Switchgear is compact in design and fully sealed
3.30 years long life
4. Maintenance-free design
5.2.5mm thickened stainless steel shell
6. Flexible extension structures
7. Circular power distribution, can still operate in case of circuit failure
8. Equipped with type test report
Finally, the three mainstream insulation methods of Transformer Ring Main Unit are introduced. If you have any questions, you can contact us by mail
