Vacuum circuit breakers series VK are based upon latest generation of vacuum interrupters, distinguished by minimal dimensions and masses. Product range of series VK covers rated voltages up to 38 kV, rated breaking/making capacities up to 40/100 kA and rated currents up to 3150. Circuit breakers are designed as three-pole units, with vacuum interrupters built into insulating cylinders.
The complete line of circuit breakers is designed and type tested in accordance with IEC Norms (Pulication 62271-100).
A - Poles
B - Operating mechanism
C - Base
D - Transmission levers
P1, P2 - Terminals
1 - Insulating cylinder of epoxy resin reinforced with glass-fiber
2 - Vacuum interrupter
3 - Fixed upper carrier
4 - Moving contact
5 - Flexible connection
6 - Lower connection housing
7 - Addition of moving contact of the vacuum interrupter
8 - Insulating lever
9 - Transmission lever
Spring charging, energy storing operating mechanism type m5-VK is used at circuit breakers series VK. Operating mechanism is mechanically trip-free, with possibility of energy surplus restitution. These features make the operating mechanism extremely reliable and endurable.
Operating mechanism is equipped with motor drive, opening and closing releases, anti-pumping device, auxiliary switch with 5NC and 5NO contacts, and 24-pin plug-in connector for connection of auxiliary circuits. Other special fittings can be delivered on customer’s request.
BASIC TECHNICAL SPECIFICATIONS
|Power frequency withstand voltage 50Hz/1min.||kV||28||95|
|Impulse withstand voltage 1,2/50µs||kV||75||200|
|Short time withstand current (3 sec.)||kA||16||40|
|Rated making capacity (peak value)||kA||40||100|
|Rated breaking capacity (symmetrical)||kA||16||40|
|DC component at asymmetrical current||%||32||32|
|Rated breaking capacity for single cap. bank||A||400 (IEC)||400 (IEC)|
|Arcing time at rated breaking capacity||ms||10||10-15|