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Ring main units(distribution box)
Ring main units(distribution box)

1Distribution box rmu without SF6 2Circuit breakers and fuse-switch combinations can be freely assembled 3Long Mechanical Life

Distribution box Ring main units

Brief Introduction

Solid Dielectric Ring Main Unit adopted Epoxy Resin as the insulating material, is a new developed environmental friendly and high-tech product experiencing two years and seven months researching and development with the assistance of related national departments.

Solid insulated Ring Main Units adopts  insulation technology shielded with Epoxy resin and silicon rubbers.

Compact, Light Weight, Reliable and Secured

Environmental Friendly

International Invention, Domestic Initiative Design

Domestic emphasized new product

Beijing Initiative product

Beijing Torch plan

 

Dimension

CSG

A

B

C

1 Loop

440

340

440

2 Loop

840

740

840

3 Loop

1240

1140

1240

4 Loop

1640

1540

1640

5 Loop

2040

1940

2040

Structure Features

All energized parts are sealed into epoxy resin bushing and rubber shield bus bar, fully shield and insulated.

Three position load switch structure design

Visible switch working position

Maintenance-free, suitability for outdoor application

Optional Spring operating mechanism, permanent magnetic controller

Standard modular design of manual and automatic operating mechanism, flexible assemble enabling

Arc-protection by separate phase to phase insulation

Comprehensive Modular Design, high standardized modular design enables flexible assembling and maintenance

Multiple interlock function, safe operation ensured

Equipped with power network automation terminal modular, suitable for enterprises power network updating and rebuilding

Operation Mechanism adopts three protection processes, suitable for sever ambient conditions of site

  

Benefits of Product Application

Suitability for application in areas with low temperatures 

The design of solid ring main unit reduces the dependence on SF6 gas which eliminate the potential problem caused by insulation gas of being liquefied under low temperature

Suitability for application in areas with high temperatures

The increased pressure caused by higher temperature is no longer an issue for solid dielectric ring main unit

Suitability for application in low-lying areas and construction sites with labor forces

The density of SF6 is five times more than normal air under the same condition, leaked SF6 are easily deposited in low-lying areas which is very dangerous for people working there. People can be suffocated by leaked gas.  

Suitability for application in closed environment:

Vacuum arc extinguishing chamber is under normal pressure where all bushing and sealed fillings are solid dielectric which prevent the potential of explosion caused by normal gas insulated product.

Suitability for frequent switching operation

SF6 load switch is designed for switch operations for up to 2000 times, while the switch operations for solid dielectric designed ring main units are more than 100000 times.

Suitability for environmental protection

The green house effect caused by SF6 has drawn much attention, solid dielectric designed ring main unit eliminate the use of SF6 gas, which further meet the national requirement for environmental protection.

Specification

Modular C

Modular F

Modular B

Fuse Switch

composite apparatus

Vacuum Circuit Breaker

Isolating/earth Switch

Rated Voltage kV

12

12

12

12

Power frequency withstand voltage, Phase to phase, phase to earth/phase to breaking point kV

42/42

42/42

42/42

42/48

Lighting Impulse Withstand voltage,Phase to phase, phase to earth/phase to breaking point kV

75/95

75/95

75/95

75/95

Rated Current  A

630

125

630

Closing loop breaking current A

630

125

630

Cable charging breaking current A

10

5% Overload Breaking current

5%

31.5

Earth fault cable charging breaking current  A

31.5

Earth fault cable charging breaking current

17.3

Short-circuit breaking current  kA

P.S

20

Closing capacity

50

P.S

50

50

Short time withstand current 4 S

20

20

20

Rated transferring current

1500

Mechanical life times

10000

10000

10000

2000

Ring main units(distribution box)

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