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MAINTENANCE
ELECTRICAL SERVICE LIFE
The electrical service life of the vacuum
interrupter is defined by the electrode wear and
the
number
of
(mechanical life).
To determine electrode wear, measure the
distance between the lever and washer in the
closed (ON) state, as shown in Figure 13. This
dimension is called the "wipe". If the 1.0mm
contact wear gauge cannot be inserted, then
the end of the service life has been reached.
The maximum number of open/close operations
is 500,000 regardless of the magnitudes of the
currents interrupted.
information
regarding
vacuum interrupters.
The drive unit and the closing coils also have
an electrical service life of 500,000 operations.
As a result, these parts should be replaced
around 500,000 operations.
MECHANICAL SERVICE LIFE
The normally energized type has a mechanical
service life of 2.5 million operations.
mechanical
service
interrupters is 500,000 operations.
For
the
components
replacement or detailed inspection and cleaning
are recommended after the indicated number of
operations.
Isolation
Flange
A
Figure 13 - Wipe Measurement
open/close
operations
Contact Toshiba for
replacement
of
life
of
the
vacuum
listed
in
Table
Table 4 - Recommended Part Replacement
Intervals
Part Name
Vacuum Interrupter
Auxiliary Switch
Moveable Core
Stationary Core
the
Closing Coil
Flexible Conductor
SERVICE LIFE – CAPACITOR SWITCHING
Switching of the capacitor loads produces
severe conditions for contactors, such as high
frequency inrush current and phase-to-phase
recovery voltage more than twice the normal
The
voltage.
The criterion for the maximum number of the
4,
capacitor current switching operations is shown
in Figure 14. The vacuum interrupter should be
replaced
operations in the graph is reached.
10
8
6
4
2
1
10
Figure 14 - Capacitor Switching Life
Number of Operations
for Replacement
500,000
200,000
Detailed inspection and
cleaning every 500,000
operations.
Detailed inspection and
cleaning every 500,000
operations.
500,000
500,000
when
the
number
20
40
60
200
100
Switching Current (A)
Page 23
of
switching
400 600
1000
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