Medium Voltage Specialists
We offer a complete range of Switchgear Components & Accessories
About Us
GWS | GREAT WALL SWITCHGEAR Electric Technology Company Ltd, was founded in 2009, and is located in the Economic Development Zone of Yueqing. It is a Technology Enterprise, specialising in the field of Medium Voltage Gas Insulated Switchgear. Our Company specialises in manufacturing of 6.6 - 36 kV SF6 fully insulated metal compact switchgear.
In our 10,000 square meters factory, We have fully automatic CNC flexible production line and welding robots, with factory test and diverse test conditions of all products. Our company possesses 2 international patents and 23 utility model patents and is ISO9001 certified. With a production capacity of 2000 panels per year, over the past decade, We have supplied over 18,000 panels to the Chinese State Grid as well as International Markets.
What Makes Us Different?
Using Advanced Technology in the production and manufacturing of Medium Voltage Gas Insulated Switchgears and Accessories.
Overview
- Transformer protection by fuse (F function)
- Transformer and line protection by vacuum circuit-breaker (V function)
Its compactness, wide range of functions and ease of installation and extensibility, make it a versatile switchboard to fit many secondary distribution applications such as: public distribution, industry, infrastructure or renewables.
The high voltage conductive parts of the GWS switchboard are placed in an insulating inert gas (Sulphur Hexafluoride - SF6) which is neither reactive nor toxic.
The gas is confined in a hermetically sealed stainless steel tank. GWS is insensitive to the outside environment and to any possible aggressions such as:
- Humidity
- Dust
- Pollution
- Dirt
- Harmful rodents.
The use of SF6 as an insulating gas, and the design of GWS, makes it one of the most compact MV switchboards on the market (for instance, a cubicle with 3 functional units is 1 meter wide).
With a service life of 30 years for the main circuit without maintenance, the overall design of the range of GWS switchboards guarantees simple and reliable use:
- Simplified maintenance of the functional units and with continuity of service for the other units (LSC2 class)
- No gas filling is required on site at installation nor during the service life of GWS under normal operating conditions
- Long service life
- Interlocking to ensure the correct sequences of operations
- Can be used in substations with or without walk-in operation corridors
- Voltage presence indicator light
GWS has been designed for maximum safety of the operators and equipment in particular in case of internal arcing in the equipment:
- Safety valves at the rear yield and thus avoid gas overpressure
- An exhaust duct cools down and evacuates the gases towards the top (optional) and/or a deflector at the rear channels and cools the hot gases
- Front and lateral protection for the operator
C - Cable incoming or outgoing feeder with switch-disconnector and earthing switch
F - Transformer protection with switch-disconnector fuse combination
V - Transformer/line protection with vacuum circuit breaker
D - Direct incoming feeder without earthing switch
De - Direct incoming feeder with earthing switch
S - Bus coupler with switch-disconnector
I - Bus coupler with vacuum circuit breaker
M - Metering panel
This version can be easily integrated into a minisubstations thanks to its compact size and small footprint. Up to 6 functional units can be assembled in a single tank insulated by SF6 gas.
The extensible version of GWS is used to enable the extension of a switchboard with additional functional unit.
- GWS: Double extensible version
GWS switchboard can be extended on either or both left and right sides. - GWS: Single extensible version
GWS switchboard can only be extended on one of the sides
These versions offer the following advantages:
- A highly economic solution for secondary distribution applications
- Installation in very limited space locations such as through a narrow opening or hatch is possible
- The additional GWS extensible functional units can be arranged in any order you like
- A subsequent extension is possible through connecting device at the bushing level.
The flexibility and modularity of GWS extensible make GWS an ideal MV switchboard for applications in the industrial sector, or for those liable to change in time such as public distribution network.
Product Blueprint
Hermetically-sealed stainless steel tank filled with gas to insulate the main circuit.
1 of 9Operating mechanism compartment and mimic diagram.
2 of 9Fuse compartment.
3 of 9Cables compartment door.
4 of 9Vacuum circuit-breaker.
5 of 9Tank pressure manometer.
6 of 9Voltage presence detection system
and low voltage part.
Cable plug-in connections.
8 of 93-position switch-disconnector.
9 of 9
