TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 30 Thomson Technology
7.3.1. GENERAL DESCRIPTION
800A-4000A transfer switches consist of two insulated case power switching units
mounted in a vertical stack configuration. Standard transfer switches have insulated
case power switching devices, which are fix-mounted. Draw-out power switch
devices are available as an option for additional service and maintenance benefits.
The power switching devices are electrically and mechanically interlocked using a
cable interlock mechanism. On Closed Transition type transfer switches, the
mechanical interlock is removed. The power switching units are provided with an
internal motor operator and open and close coils. Manual operation pushbuttons are
provided on the face of the power switching units.
Should adjustment be required on the mechanical interlock, it is advisable to consult
Thomson Technology for further information.
7.3.2. EQUIPMENT INSPECTION
To maintain mechanical integrity, ensure that:
q All linkages are correctly adjusted.
q Mechanical interlocking is correct - it should not be possible to close a power
switching unit without first opening the other power switching unit.
q All fasteners are adequately tightened.
q The operating linkages are not damaged or bent, and that all bearing points
operate freely.
To maintain electrical integrity, ensure that:
q All electrical connections are clean and adequately tightened. Corroded or loose
power connections will cause destructive heating, and may cause premature
tripping of the power switching devices that incorporate integral over current
protection units.
q All insulating devices are in place and in good condition.
q No moisture or other contamination is present.
q Electrical conductors are adequately secured away from moving parts.
To maintain operational integrity, ensure that:
To Next Page
Loading...
