Fig. 29 inspection of the arc chute, 4 inspection of the contact system, Pay attention to the warnings, section 1 – GE Industrial Solutions GERAPID 8007R, 10007R WITH ARC CHUTES 1X2, 1X3 User Manual
Page 31: A) remove the arc chute, B) remove the arc chute adapter, Fig. 30 adapter and contacts area, Fig. 31 checking the contact system erosion, C) check the protective walls, D) check the pre arcing probes, E) check the arcing contact
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1
3
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Fig. 31 Checking the contact system erosion.
C) Check the protective walls
•
[Fig. 31]. The material burn out on the protective walls (5)
must not exceed 1 mm [0.04 in] in any place.
D) Check the pre arcing probes
Fig. 29 Inspection of the arc chute.
•
[Fig. 31]. The arcing contacts should not be reduced to
less than 1/3 of the total cross section in any place. Pay
particular attention to the area around probe bend (3)
and firing point of pre-arcing contact (2).
6.1.4 Inspection of the contact system
Pay attention to the warnings, Section 1!
E) Check the arcing contact
•
[Fig. 31]. Erosion of the pre-arcing contact (1) should
amount to no more than 2mm; maximum value is 3mm!
If it is greater than 3mm, it must be replaced.
A) Remove the arc chute
•
[Fig. 28]. Take off isolation caps (6). Loosen the clamping
screws (4) and (3), using SW5 hexagon wrench and take
off the arc chute (1) from the adapter (2).
F) Check the main contacts
•
[Fig. 44]. The main contacts (4) should not show any
obvious signs of material erosion, since, in the case of
ordinary short circuits, overload and operating current
switching, the arc is ignited between the pre-arcing
contacts.
B) Remove the arc chute adapter
•
[Fig. 30]. To dismantle the arc chute adapter, loosen and
pull out the four upright screws (1) using SW5 tool. Pay
attention that no screws or washers fall inside the
breaker!
•
Arcing can take place on the main contacts only with
excessively worn and old pre-arcing contacts, or at very
high short circuit currents. The wear should not exceed
an area of 1.5 mm [0.06 in].
•
[Fig. 30]. Draw aside and lift off both halves of the
adapter (2). Then pull out two protective walls (3).
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G) Install the adapter
•
[Fig. 30]. Install the two protective walls (3). Use new ones
if necessary. Install two halves of the adapter (2) and
tighten screws (1) to 10 Nm [88 in-lbs].
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Fig. 30 Adapter and contacts area.
H) Install the arc chute
•
[Fig. 28]. Put the arc chute (1) into adapter (2). Tighten
front and backside of the arc probe screw connections
(3) including lock washer, with a torque of 10 Nm (88 in-
lbs). Tighten front and backside of the arc chute
connections (4), including flat washers, with a torque of 5
Nm (44 in-lbs). Put on isolation caps (6).
2
2010-02-16 DTR01807 rev.02
Design and specifications are subject to change without notice
31