-
19
-
6F9G0154
Table 7 Gap/wipe standard value
(mm)
Parts name
Gap
Wipe
Allowable wear
Normally
energized
type
7.0
~
7.5
More than 3.0
2.0
Vacuum
interrupter
Latch type
7.0
~
7.5
More than 2.8
1.8
12
.
CRITERIA FOR DURABILITY
(1) Electrical service life
The electrical service life of the vacuum interrupter is defined by the electrode wear the
number of open/close operations (mechanical life).
To determine the electrode wear, measure the gap between the lever and washer
(dimension A) in a closed start , as shown in Figure8. With the vacuum interrupter
closed, if a contact wear gauge or a 1.0mm thickness gauge cannot be inserted ,
this means the end of life is reached.
For the components listed below, replacement or detailed inspection and cleaning
are recommended after the indicated number of operations.
Table 8 Electrical service life
Parts . name
Electrical service life
Vacuum interrupter
100,000 operations or 15 years
Auxiliary switch
100,000 operations or 10 years
Drive unit
100,000 operations or 10 years
Movable conductor
100,000 operations or 15 years
Hence, parts should be replaced around electrical service life operations.
CONTACT SPRING
LEVER
WASHER(M8)
Fig.8 Parts to be inspected
A
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