Installation and maintenance instructions UniGear type ZS2 UniSafe-36 1YTW571780-012 Rev:E 01-2005 en Page: 21 of 25
4.2 Circuit Breaker, HD-4 W 36
Please refer also to:
Installation and service instructions, HD4 CHAPTER-6
ABB doc. no: ITNIE647016-003
Fig:4.2.1
CB in SERVICE (connected)
Fig:4.2.2
CB in TEST (disconnected)
Fig:4.2.3
CB WITHDRAWN (removed)
RACKING HD4 BREAKER INTO SERVICE POSITION
-1 Place the breaker onto the CB trolley.
-2 Open the CB compartment door .
-3 Check that CB compartment is ready. (shutter not locked, no foreign objects such as packing material,
hand tools etc.)
-4 Place the trolley in position in front of the cubicle and hoist it to same level as the rail in the cubicle.
Fold the bridgepart and make sure it locks in the cubicle.(fig:2.3.11)
-5 Push the breaker into the cubicle.
-6 Remove the CB trolley.
-7 Check both two handles on racking mech are released and lock the CB to the rails in the cubicle.
-8 Connect the multipole contact for the auxiliary circuits. (Attention: The multipole connector fits only
if the rating of CB fits the rating of cubicle)
-9 Check that -the springs are loaded
-SF6 gas pressure is ok,
-CB is open,
-Auxiliary voltage present (Electro-mech interlocking (YL2) blocks the racking when
multi-pole connector is inserted and control voltage is not available)
-10 Close the door.
-11 Open the earth switch, remove the ESw handle, close the ESw crank cover(11)
!
CAUTION! For safety reason all racking and operation of the breaker shall be done behind the
closed door.
-12 A crank is used for the racking. The crank shall be inserted through the hole in the breaker door and
should be first pressed then rotated to start the racking.
Crank the breaker racking mechanism clockwise 30 full turns (of 360degr.) At the last 2 turns the
friction will increase because the main contacts engage.
After full racking the related limit switches at the bottom of LVC compartment signal (fig:4.2.10)
-13 The breaker is now prepared to operate.
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