SVIT isolated truck

1.1 General

SVIT isolated truck is suitable for the indoor airinsulated withdrawable version switchgear, for the main circuit without load transfer, as well as the isolation for electrical equipment with chared lines, for example, main bus bar, circuit breaker,etc.

These trucks allow the top contacts to be connected directly to the bottom ones, connection is made extremely safe and reliable by using the "pole" type to insulate the connection busbars from the external environment.

In the incoming/outgoing units, the isolated truck connects the main busbar system to the power cables, whereas in the bus-tie units, it connects the two sides of the bus bar system.

1.2 Standards and specification

1.2.1 Standards

The SVIT isolated trucks conform to the specifications of the following standards.

• GB/T 11022, common technical requirements of high-voltage switchgear and control equipment

• IEC 60694 and VDE 0670 part 1000, common specifications for high-voltage switchgear and control gear standards

• GB/T 1985, high-voltage AC isolated switch and earthing switch

• IEC 62271-102 and DIN VDE 0671 part 102,common alternating current disconnectors and earthing switches

1.2.2 Installation and operating

The relevant standards and specifications shall be considered and complied, in particular:

• IEC 61936 and DIN VDE 0101, power installations exceeding 1 kV a.c.

• Safety and accident prevention regulations published by professional groups or organizations

• Related safety guidelines of auxiliary materials and operational tools

• Safety regulations of ABB Xiamen switchgear Co., Ltd.

1.3 Operating conditions

1.3.1 Normal service condition

• Ambient temperature

- Max temperature +40°

- Average maximum over 24 hours +35°

- Min temperature -15°

• Humidity

- The average relative humidity measured for a period longer than 24 must not exceed the 95%

- The average value of the pressure of the water vapor, measured for a period longer than 24 hours, must not exceed 2.2 kPa

- The average value of the relative humidity,measured for a period longer than 1 month,must not exceed the 90%

- The average value of the pressure of the water vapor, measured for a period longer than 1 month, must not exceed 1.8 kPa

• Altitude: ≤1000 m

• Atmospheric environment Ambient air should not be obviously polluted by the dust, smoke, corrosive or flammable gas, vapor, spray.

1.3.2 Special service conditions

• Installation above 1000 m altitude Possible within the limits allowed by reduction of the dielectric resistance of air

• Increase the air temperature In order to avoid the risk of corrosion or other damage in areas with high humidity and/or rapid large fluctuations in temperature, take appropriate measures (for example, using suitable electric heaters) to prevent any condensation phenomena. For special installation requirements or other operating conditions,please contact ABB.