Insulator For Fusebase And Quick Make Earthing Switch; Changing Parts In Nal/Vr 36 Kv; Changing Contact Knives - ABB NAL Series Mounting And Operation Manual

19.0 Insulator for fusebase and quick make earthing switch

Fig. 72
1. Unscrew 4.2 and detach the fuse clips and contact block
respectively.
2. Unscrew 4.3 at the base of the insulator and detach the
insulator.
3. Attach the new insulator to the frame by the two self-tapping
screws 4.3. For correct torque see page 29.
Note the washer and spring washer for the screws.
4. Attach the fuse clips and contact block respectively to the
top of the insulator by the screws 4.2.
For correct torque see page 29.

20.0 Changing parts in NAL/VR 36 kV

WARNING
These operations can be carried out by
specialists only!

20.1 Changing contact knives

Disconnect the switch-disconnector. When A-mechanism is
fitted, the opening spring must NOT be charged.
1. The draw bar is detached from the crank arm of the opera-
ting shaft, see Fig. 73.
Fig. 72 Support insulators | Fig. 72 Detached draw bar
Fig. 72
26 NAL/NALF/VR – Mounting and operation manual
Fig. 73
b