X
O
p
er
at
in
g f
re
q
u
en
cy [
n]
Breaking current Ia [kA
A B B I N T H E R A I LWAY S – M ED I U M VO LTAG E P R O D U C T S
27
A B B I N T H E R A I LWAY S – M ED I U M VO LTAG E P R O D U C T S
27
1V
S
R
6
3
0
2
0
6
E
N – e
n – E
D
O
-D
0
0
0
2
8
5
2
– I
n
st
ru
ct
io
n m
an
u
al – 2
0
21
.1
0 D
es
ig
n a
n
d s
p
ec
if
ic
at
io
n a
re s
u
b
je
ct t
o c
h
an
g
e w
it
h
o
ut n
o
ti
ce
8.2.2.1. Procedure
•
Dismantle the cover panel of the drive unit
• Detach the three fastening screws of the quick-
action coupling cap and store the cap with the
O-ring in a safe place
• Insert the quick-action coupling of the pressure
gauge into the mating piece of the pole and
check the pressure
• When decoupling, withdraw this quickly so as to
leak as small a quantity of gas as possible
• Finally fit cap, gasket and cover panel in order to
seal the pole again
Quick-action
coupling cap
Pressure
gauge
8.2.3. Checking the Vacuum Interrupter
During operation, due to the switching operations
both at short-circuit current as well as at nominal
current, the contact becomes more or less heavily
stressed and worn. This wear can be determined
theoretically according to the corresponding
electrical cases of loading. However, if the
theoretical limit for wear is reached, a check must
be carried out.
Inspect the vacuum interrupter using a
vacuum tester (recommended every 10
years, but not compulsory)
For this check, the apparatus must be in an
electrically secured and switched-on state
Before the measurement, the drive unit cover
panel must be removed, in order to obtain access
to the upper part of the electromagnetically-
operated mechanism.
The dimension
“X”
should not fall below the value
of 5 mm. Normal values for this dimension for
brand-new apparatus are 8 – 10 mm.
A gauge for easy measurement is available on
request.
If the measured value
“X”
drifts from the
prescribed tolerance range, the vacuum switching
chamber must be exchanged. For additional
advice, contact ABB.
This exchange including the necessary final tests
must be performed by ABB specialists at ABB.
Fig. 26
a&b
Fig. 28
(electrical service life graph)
Fig. 27
(wear measurement)