ACB-I
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I N S T R U C T I O N S
9.3.2 How to draw out the breaker
Turning handle counter clockwise can draw out the breaker, which is in "connected" position. It needs to pull out the handle
to drab out the breaker body from drawer seat when indicator means to "disconnected" position (It cannot be drawled out
unless handles has been pulled out).Firmly grasping the handle can remove the breaker from drawer seat.
Breaker
must be disconnected before plugging into drawer seat. The breaker in Test position, whose secondary circuit has
been
connected, is allowed to be test.
9.4 Maintenance
9.4.1 Routine cleaning to keep insulted well.
9.4.2 Inject lubricating oil (to the axletree part) and consistent grease
(to the gears and other slide parts)
9.4.3 Inspect the contact system and the mechanism periodically.
a. Check the arc-extinguishing chamber and the wear state of contacts. Measure opening distance and contact over travel
if necessary. When the contact over travel is being measured, the displacement between moving contacts and contact
sustainer can be checked. When the breaker is closing, make a mark on contact sustainer (at the point of arcing horn of
moving contact). Then break the breaker and measure the di
splacement of the moving contacts, which multiplied by
28/53 is the over travel of contacts. This value should not less than 4mm.
b. Check that if fastening units are loose or not, namely any drop or invalidation.
C . Check that if acting distance of under-voltage release, shunt release or closing electromagnet has surplus or not. Surplus
of closing electromagnet should be about 1mm. Others shoul
d be large than 1mm.
d. Check that if operation characteristics of all accessories conform to requirements or not.
e. Fill in1mm thick horseshit scrip or other relevant material between moving contacts and xed contacts, and the breaker
should be closed reliably. Please be careful when lling in.
9.4.4 It is necessary to renew motor-driven energy-storage mechanism, main contacts, spring of
energy-
storage mechanism if it achieves medical life without maintenance.
9.4.5 After breaking of short-circuit, the checking content is the same as above. Further more, the
exible connection with its jointing part should be checked. In addition, they should not have
obvious failure; otherwise, the broken parts should be renewed. Rene arc-extinguishing chamber
and contact system in time when the breaker
gets to its electrical life.
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