Maintenance
UR46-81/82S
Document number: SG104148TEN
Revision: B01
Issue date: 20.8.2012
Copyright© 2012 Sécheron SA - This document is not contractual and contains information corresponding to the level of technology at the date of release.
D-34
File: d-UR46-8S_maint_en.fm
Method 2
The circuit-breaker must be closed.
Measure as shown below.
– “W
2
” dimension for new contacts is 8±1mm.
– If W
2
≤
3
±0.5
mm, replace the main contacts (see §
D.7
).
03624
Note!
Where the optional manual closing device is present, please see §
G.1 "Manual closing device"
.
D.6.3
Check and adjustment of the X clearance
Requirement: X = 2.0
± 0.5
mm.
Note!
This measurement is performed with the circuit-breaker opened and secured in this position.
Measurement
a) The SG101777P00001 spacer (1) must be inserted between the mobile and the fixed
contacts to block the contacts in the open position.
04638-S
b) Checking the X clearance: two possible ways:
•
Measure the extension of the rod (2) out of the closing device (3) with a depth gauge or a
comparator.
– First, without pressure on the rod (2), measure the length A.
– Second, with pressure (6) applied axially onto the rod (2), press the fork (4) against both
catches (5), measure the length B.
– The A-B difference corresponds to the X clearance.
•
Remove the arc chute (see §
D.5.1 "Arc chute removal"
) and the spark arresters (7).
Insert the Sécheron’s “X” gauge (8) (or a feeler gauge) between the fork (4) and one of the
two catches (5).
c) Adjust the X clearance if the measurement is out of tolerances.
Adjustment
Add or remove the bolt shims (9) of the closing device according to §
D.10
, until the correct X
clearance is obtained (adding shims (9) increases the X clearance).
W
2
1
2
1
2
7
4
5
1
9
3
2
B
A
X
6
8
X
Summary of Contents for UR46-81S
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