Description

ABB Transformer unit – outdoor dead tank circuit breaker Outdoor Breaker

ABB Transformer unit Outdoor Vacuum Circuit Breakers upto 33KV :
Available in current ratings upto 2500A and Short time withstand current of 31.5 KA/3sec. It is designed and type tested to meet requirements of IEC-60056

Salient Features :
– Porcelain Clad Construction, suitable for outdoor sub-station layouts
– Fully Type Tested
– Guaranteed for long electrical life with proven vacuum interrupters and excellent arc quenching and insulating – properties of vacuum
– Guaranteed for long mechanical life
– Minimal operating energy required enabling use of simple, reliable and proven low energy spring operating mechanism Re-strike free
– Suitable for auto-reclosure duty cycle
– Mechanical Operation counter
– Easy to install-structure mounted, with an option to extend structure for mounting of instrument transformer
– Complete breaker can be shipped as one single unit-no adjustment required at site
– Applications-capacitor switching, distribution networks, arc furnace duty, switching unloaded transformers and reactors

Outdoor SF- 6 Circuit Breakers upto 40KV :
Available in a current rating of upto 2500A and STR of 31.5KA / 3sec. It is designed and type tested to meet requirements of IEC-62271-100.

ABB Transformer unit Applications:

Used in power distribution for controlling and protecting lines, substations and transformer and distribution substations, transformers, rectifier units, capacitor banks etc Thanks to SF-6 AUTOPUFFER breaking technique, they do not generate over voltages and are therefore highly suitable for retrofitting, upgrading and enlarging older installations where the insulating materials of the cables and apparatus may have been stressed during service.

OPERATION

CLOSING-

In the open position, the magnetic actuator’s armature rests against the bottom plate in the actuator assembly. The armature is held there by the force developed by the magnet. When the top coil is energized, the magnetic flux generated is in the same direction as the magnet assembly. The armature is drawn into the coil and brought into contact with the upper plate. In this position, the coil is de energized and the armature is held in position by the magnets alone. As the armature is drawn into the coil, the operating rod, which is attached to the top guide rod, moves the moving contact of the vacuum interrupter towards the closed position. The actuator has more stroke than the vacuum interrupter and the interrupter contacts make contact before the actuator has completed the stroke. The additional movement of the operating rod after the contact closing causes the contact pressure spring to compress at the top of the operating rod. This wipe allows for contact wear in service.

OPENING –

When the bottom coil is energized, the magnetic flux opposes the force generated by the magnet assembly. This reduces the holding force, the armature is released and the coil attracts the armature to the bottom plate. Once there, it is held open by the magnet.

Key benefits

• Compatible with all forms for overcurrent, reclosing and control functions
• Reduced maintenance with magnetic actuator and easy plug-and-play actuator circuitry
• Durable design exceeds ANSI C37.06 standard with a rating of 10,000 mechanical or load operations

Key features

• Dead tank solution
• Designed and type tested based on latest ANSI standards
• 15/27/38 kV rating classes and up to 3,700 A continuous current
• Up to 40 kA short-circuit interrupting current
• Five-year full warranty

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