Application Area

Based on its superior patented technologies such as solid insulation, solid sealed pole, fully-insulated modular busbar, etc, solid insulated ring main unit fully meets the ring network and radiation distribution network of various wiring programs.

At the same time, solid insulation switch unit has been in the alternative demarcation switch, box-type substation high-side switch, KYN28 in the cabinet, XGN fixed cabinet and other applications have high quality performance, especially for those area which pursues SF6 free.

The intelligent terminal equipment connected to the solid insulated switch unit can monitor and control the real-time situation remotely and ensure the intelligentity, reliability and flexibility of the distribution network system.

Product Features

• Comaring with the gas insulated switchgear, this electrical distribution equipment is SF6 free, no SF6 is contained, avoiding pressure tank designing.

• All live parts are sealed or embedded in the epoxy resin and silicon rubber, fully insulated and wholly enclosed structure, safety protection level: IP67.

• All operating mechanism sealed inside a box, truly maintenance-free.

• Enhanced phase separation design, independent phase insulation to avoid the fault between phases.

• Standard modular design to facilitate unit extension, modification and replacement.

• Switch working position of each phase could be observed independently.

• Safe, smart, environment-friendly, flexible assembly enabled, good performance to apply in special environments.

• Multiple mechanical interlock to achieve 'five-protection' function.

• Complete indoor & outdoor switchgear application solution.

Multi-environment Application

Coastal area: fully sealed structure of the mechanism, professional high salt spray testing equipment to ensure long-term application in coastal areas.

Low temperature area: The solid insulated switchgear doesn't need SF₆, so the potential problem caused by insulation gas being liquified under low temperature can be avoided.

Plateau area: Due to the absence of SF₆, the problems caused by the big pressure difference between the inside and outside of the gas tank in high altitude areas can be avoided.

Explosion forbidden places: The switch adopts vacuum interrupter sealed with epoxy resin bushing which can prevent the gas exposure and explosion. 

Basement with workers: The density of SF₆ is 5 times higher than air on the same condition. So if the SF6 in a traditional RMU leaks out, it will accumulate in low area, so the workers there could be harmed or suffocated.

Frequent switching operation situation: Switch operations for solid dielectric designed RMU reaches 20,000 times.

Areas with high requirements for environmental protection: Our solid insulated switchgear doesn’t contain SF₆, which is a kind of greenhouse gas.

Windy and sandy area:The IP rating of the live parts reaches IP67. The control circuit compartment is specially treated, so our product can work in windy and sandy area for a long time.

High temperature environment: Suitable for special areas of high temperature environment, the maximum temperature of normal operation is up to 70 ℃. The high temperature environmental test has been performed.

Nominal Working Conditions

Ambient temperature

                            Maximum temperature + 70℃

                            Minimum temperature - 50℃

Humidity Level

                            Maximum comparative average humidity

                            Daily average ≤ 95%

                            Monthly average ≤ 90%

Seismic capacity

                            Level 8

Altitude

                            ≤5500 M

Water submersion test

                            24 hour water resistance at a pressure of 0.3 bar 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      28.0 mm

Structure Diagram

Dimensions

		Module C	Module F	Module V
		Load Switch	Load Switch + Fuse	Vacuum Circuit Breaker	Disconnector	Earthing Switch
Rated Voltage	kV	12	12	12	12	12
Arc Quenching		Vacuum	Vacuum	Vacuum
Rated Current	A	630	125	630/1250	630/1250	630/1250
Rated Frequency	Hz	50	50	50	50	50
Main Circuit Resistance	μΩ	≤120	300 Note1	≤120
Power Frequency Withstand Voltage Between Phases, Phase to earth/open contacts	kV	42/48	42/48	42/48	42/48	42/48
Lightning Impulse Withstand Voltage Between Phases, Phase to earth/open contacts	kV	75/85	75/85	75/85	75/85	75/85
Rated Short-circuit Breaking Current	kA		31.5 Note2	20/25/31.5
Rated Short-circuit Breaking Times	times			30
Rated Short-circuit Making Current	kA	50		50/63
Rated Short-circuit Making Times	times	5		5
Rated Short-time Withstand Current	kA/4s	20		20/25	20/25	20/25
Rated Peak Withstand Current	kA	50		50/63	50/63	50/63Out
‍Out-of-phase Earth Fault Breaking Current	kA			17.3/21.7
Rated Cable Charging Breaking Current	A	10		10
Rated Take-over Current	A
Internal Arc Test(AFLR)	KA/s	20KA/0.5s (Include busbar room, switch room, cable tank)
Partial Discharge	pC	≤5	≤5	≤5
IP Rating		IP67	IP67	IP67
Mechanical Endurance	times	10000	10000	10000	3000	3000