A New Generation of RMU

SVI - Solid Insulated fully shield Ring Main Unit is SOJO’s own property right product, the product is SF6 free which has been put into application since 2007. It has also been successfully type tested at KEMA in accordance with relevant IEC Standards.

Product Features

l  Adopted embedded pole technology, all live parts are shielded within epoxy resin cast or silicon rubber, degree of protection for live parts reach IP67.

l  SF6 free; environmentally friendly product

l  Distribution automation available

l  Compact, light-weighted, reliable

l  International patent and domestic initiative product

Product Design Features

l  Product designed and analyzed by following computing technology

ProE, Solidworks, computer simulation

Solid Modeling, Virtual assembly

ANSYS Finite element analysis and optimization design

ADAMS analysis of electromagnetic field

3D motion simulation of mechanism

Movement interference

l  Optional configuration available for SOJO’s DTU SJDA 2000 or client can select other DTU brand.

l  Solid insulated medium-voltage switchgear is an environmentally friendly product, which is in accordance with the future development trend of international environment protection.

Reliability and Stability

Solid Insulated RMU is totally SF6 free, unlike SF6 RMU; the insulation ability depends on the pressure level of SF6 gas.

Every phase is embedded within epoxy resin cast independently, therefore, no potential risks of discharging between phases.

Product successfully passed the test by submersing the unit into water under pressure of 0.3 bar for 24 hours’ live operation.

Epoxy resin cast tested before and after production, we ensure the partially discharging for the cast is less than 5PC. Vacuum interrupter adopts domestic well-known brands.

Switchgear cast successfully passed the thermal shock test to ensure the cast not affected by severe temperature changes.

High glass transition temperature ensures the insulation ability of cast and silicon rubber does not drop down under high temperature.

Technical Data

Nominal working conditions

Ambient temperature

Maximum temperature + 45℃ _

Minimum temperature -45℃_

Humidity Level

Maximum comparative average humidity

Daily average  ≤95%

Monthly average ≤90%

Altitude  3000 M

Seismic capacity level 8

Water submersion test

24 hour water resistance at a pressure of 0.3bar and voltage of 12 KV.

Degree of protection

Sealed electrified body IP67

Fuse tube IP67

Metal enclosure IP4X

Busbar

Internal earthed busbar 150 mm2Cu

Thickness of insulation bushing 12.0 mm

The diameter of sealed and insulated busbar 25.0 mm

Special Ordering Requirement

Contact SOJO for information