Overview - ABB ConVac Installation And Operation Instruction Manual

8 C O N V A C V A C U U M C O N T A C T O R I N S T A L L A T I O N A N D O P E R A T I O N I N S T R U C T I O N
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1. Overview

ConVac vacuum contactors are electrical switching
devices suitable for AC power distribution systems,
especially ideal for frequent operation.
The basic composition of contactor:
• Three insulating covers molded in thermoplastic
material containing the vacuum interrupter
• Electromagnetic mechanism
• Power control module
• Auxiliary contacts
• Opening and closing status indicator
• Counter
• Mechanical latched kit RiMe (only for mechanical
latched type )
In addition to having all the components of a fixed
version, a withdrawable contactor also contains:
• Fuse-holder of DIN or BS type fuse according to
customer requirements
• Automatic tripping device associated with fuse
of each phase
• Truck
• Interlock device to prevent the truck
racking-in/out while the contactor closed
• Self-powered VT (when needed)
ConVac vacuum contactor adopts linear drive
structure design, the movement direction is
coaxial for operation mechanism and vacuum
interrupter to ensure better dynamic
characteristics and longer mechanical life, using
three phase independent pole design to further
improve its insulation and mechanical performance.
1.1 Electromagnetic mechanism
For electrical latched type， when the closing coil
is energized by external auxiliary power，the core
may produce magnetic field and electromagnetic
force, which makes the contactor to close and
compresses the opening spring. Once the contactor
reaches the closing position, the system minimizes
the power supplied to the closing coil only to keep
the contactor in the closing position.
When the auxiliary power supply is cut off or the
voltage of the auxiliary power supply drops due to
human factors (opening command) or non-human
factors (fault on the power side), the contactor
will release the moving contact under the action
of the opening spring, so that the contactor will
be opened.
For the mechanical latched type, the closing
method is exactly the same as above. After closing,
the contactor is kept in the closing position by a
mechanical locking device (RiMe).When the
contactor got the opening command, the opening
coil is powered on, the mechanical locking device
is unlocked, so that the contactor will open by the
opening spring.
The power module is supplied with wide voltage,
and its characteristics are as follows：
Voltage Inrush power
110...125 VDC/AC ~1000 W
50-60 Hz
220...240 VDC/AC ~1000 W
50-60 Hz
Electrical characteristics of mechanical latched
device (RiMe)
Voltage Inrush current
24 VDC 40 A
48...60 VDC 25 A
110...125 VDC/AC 50-60 Hz 10 A
220...240 VDC/AC 50-60 Hz 7 A
1.2 Available type
The 7.2 kV and 12 kV ConVac vacuum contactors
are available in both fixed and withdrawable
version.
Holding power
~50 W
~50 W
Operation time
100 ms
100 ms
100 ms
100 ms