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