Safety Instructions; Recommendations For Receipt, Handling And Storage Of Equipment; Switch-Disconnector Type Nal/Vr, Alternative Assemblies; Installation - ABB NAL Series Mounting And Operation Manual

Triple-pole switch-disconnector type NAL/VR
and fuse switch-disconnector type NALF/VR

1.0 Safety instructions

WARNING
Careless handling of high voltage can result in
serious injury or death. Before carrying out of any
maintenance/installation of apparatus, read these
instructions carefully.
– Comply all general safety rules during any activities related to the
electrical apparatus under high voltage.
– Make sure that the apparatus will be installed in proper place.
– All maintenance and installation activities can be performed
by specialists with valid licenses only.
– Always follow these instructions closely.
– If you have any questions or doubts, please contact with proper
ABB personnel.
2.0 Recommendations for receipt, handling and storage of
equipment.
– Check the apparatus condition directly after receipt. Any dam-
ages should be reported to the transporter,
– Make sure that the product is complete and complies with the
order.
– Be careful during transportation of apparatus.
– Never lift apparatus by grabbing current knives, main shaft and
insulators, because it may cause switch damage.
– Before installing, keep switches only in original boxes and store it
as it indicated on the boxes.
– In order to unpack the switch, remove all the packaging elements
first. After that remove the switch from the box with using belts
fixed to upper frame plate. Do not use chains, because it may
cause damage of the apparatus.

3.0 Switch-disconnector type NAL/VR, alternative assemblies

The Switch-disconnector NAL/VR is supplied by the factory as
follows:
3.1 Fully assembled with mechanism and auxiliaries. See item 4.0
3.2 Switch main frame, mechanism and auxiliaries as separate
components, see item 6.0 i 7.0
4 NAL/NALF/VR – Mounting and operation manual

4.0 Installation

WARNING
Current knives rotate with great speed and force.
Always keep a safe distance from moving parts
of the switch. Be careful specially with type A
(double spring) mechanism. This kind of drive stores great
energy and can release it by small rotation of shaft.
Before installing, carry out visual check of switch. Make sure that
main contacts are greased with Isoflex Topas NCA 52. In case of
NAL 17/24/36 with A mechanisms , make sure that the pushing
rods are removed from the main shaft.
4.1 Preparation of the switch for installation. Fig. 1
For switches with A-mechanisms, the contact knives must be
fully opened by hand and the draw bars connected to the cranks.
Before the switch is test operated, it should be checked that the
surfaces of the main contact are covered by contact grease
(recommended grease: ISOFLEX TOPAS NCA 52).
Test operations
Switches with K-mechanism will close when the operating shaft
is turned anti-clockwise. The switch will open when the operation
shaft is turned clockwise. (Clockwise/anti-clockwise as seen from
the mechanism side of the switch).
When operating switches with A-mechanism, the opening spring
is first charged and latched by turning the operating shaft clock-
wise. Turning the shaft anti-clockwise charges the closing spring
and the switch closes. The switches open when the operating
shaft is turned clockwise.
Caution!
Keep well clear of contact knives when operating the switches.
During installation on non-flat surfaces, use shims correcting
inequalities. This will prevent the stress forces in the switch frame.
When inequalities of surface are significant, use a rigid support
structure, eg made by ABB.
Fig. 1 Switch-disconnector type NAL/VR