Characteristics of UniSwitch switchgear:

UniSwitch, the light flexible switchgear developed as a modular, simple to apply design, with fewer components, providing a high reliable, quality and safe product for you, our Customer.

By reducing the number of components, utilising modern materials correctly, we have developed an environmentally and user friendly product. The simple design and construction of UniSwitch will stand the test of time for generations to come.

UniSwitch is an air insulated (AIS), metal enclosed, switchgear cubicle design of the next generation developed through continuous innovation and vision to meet the changing market needs.

UniSwitch provides long-term technical solutions for various applications. Safety, user friendliness and environmental concerns have been the driving force in the development of the new switchgear.

UniSwitch switchgear is a compact solution for a fully automated power distribution network.

Supported by sensor technology and the latest in protection relays, it meets even the most demanding requirements in hospitals and airports.

UniSwitch is a worldwide switchgear development utilising the global experience of ABB to incorporate the needs of Customers from all over the world. UniSwitch switchgear is available from the ABB worldwide network of Companies. This univer product is manufactured in 8 ABB factories.

Switchgear for electricity distribution application such as:

• Secondary substations

• Manufacturing industry

• Shopping centers

• Airports

• Metro

• Windmills

• Small/medium size

• power plants

• Hospitals

• Sport centers

UniSwitch product provides our Medium Voltage Customer with the best solution for heavy duty switchgear in a size only a little than a single tank Ring Main Unit while including:
. the flexibility in meeting our Customers specification and accomodating on future change and upgrading
. the options include complete control, measuring and protection systems

Applications

• Utility

• Power Plants Diesel/gas engine

• Windmills

• Hospital

• Airport

• Metro

• Shopping center

• Sports center

• Industry

• Rated voltage	kV	12	17.5	24
  Rated insulation voltage	kV	12	17.5	50
  Test voltage at power frequency	kV	28	38	125
  Impulse withstand voltage	kV	75	95	50-60
  Rated frequency	Hz	50-60	50-60	50-60
  Rated short-time withstand current	kA	25	20	20
  Rated duration of short circuit	Sec.	1/2	1/3	1/3
  Peak current	kA	62.5	50	50
  Internal arc withstand current	kA 1s	20	20	20
  Bus bar rated current	A	630/1250	630/1250	630
  Feeder rated current	A	630	630	630

Ambient conditions
The switchboard ratings are guaranteed under the following ambient conditions:

Minimum ambient temperature -5 °C
Maximum ambient temperature +40 °C
Maximum relative humidity 95%
Maximum altitude 1000 m

Switchgear Construction

1. Busbar compartment
The busbar compartment is located on the top of the cubicle. This compartment contains the main busbars that intreconnect between switchgear cubicles.

2. Switching compartment
A 3-position SF6 switch-disconnector with epoxy cast resin housing is provided with inspection windows and available also with gas density indicator.

3. Cable compartment
85 % of the space in the switch-disconnector cubicle is reserved for power cable connection making it possible to use both 1- and 3-phase cables with most simple unscreened terminations. Space is also adequate for cubicle accessories such as surge arresters, current transformers, second earthing switch etc. The door has an inspection window and safety interlocking as standard. For cable entry there are 3 individual cable gland plates in the bottom with support for a suitable dimensioned cable clamp. The bottom and the threshold of the cubicle can be removed for ease of cable installation.

4. Mechanism, Interlocking and Low Voltage compartment
Behind a hinged door (which serves as control panel) are located the spring operating mechanism with position indicator and the mechanical interlocking unit. There are also facilities for cubicle accessories such as: auxiliary contacts, tripping coil, emergency tripping mechanism, capacitive voltage indicator, key interlocks and motor operating device. Space is also provided for control circuits and measuring instruments as well as a protection relay. In the 750 wide cubicles there is also a second indentical compartment for further accessories. The upper part of the cubicle, including the busbar compartment, the switch-disconnector and the mechanism and LV compartment is separated from the lower part and the cable compartment. Because of this it is possible to carry out maintenance, repair and upgrading of the unit in the lower module while the switchgear is in service.