Installation And Mounting Of The Breaker; Commissioning/Operation; Note On Safety At Work; Preparatory Activities - ABB VD4 Instruction Manual

6

Installation and mounting of the breaker

Careful and professional installation of the switchgear is one
of the fundamental conditions of trouble-free circuit-breaker
operation.
- Install the mechanism enclosure in the panel without tensi-
on or distortion, inserting dished washers below the nuts or
bolt heads at each of the four mounting points (dependent
on the order).
- Connect the main terminals without any permanent tension
or pressure forces, exerted for example by the conductor
bars.
- When connecting the conductor bars, the bolts must be
inserted to the depth shown on the dimensional drawing.
- Take account of any tested terminal zone.
- Use DIN bolts of tensile class 8.8, fastening conductor bars
together with dished washers.
- Make a short-circuit proof connection between the PE con-
ductor and the main earthing bar in the switchgear, using
contact washers.
- Remove any dirt. See also section „Servicing".
Thread size
M 6
M 8
M 10
M 12
M 16
- Rated tigthening torques for fasteners without Lubrication are based on the thread
1)
friction coefficient 0.14 (the actual values of which are subject to unavoidable,
in some cases not insignificant, spread).
- Rated tigthening torques for fastener with lubrication in accordance with
DIN 43673.
Thread and contact face of head lubricated.
2)
Take account of any tightening torques which deviate from the general table (e.g. for
contact systems or device terminals) as stated in the detailed technical documentation.
It is recommended that the threads or head contact surfaces of the bolts be lightly oiled
or greased, so as to achieve a precisely defined rated tightening torque.
Recommended
rated tightening torque
1)
Nm
Lubricant
2)
without Oil
(try) or grease
10.5 4.5
26 10
50 20
86 40
200 80
7 Commissioning / Operation
7.1

Note on safety at work

- This switchgear may only be operated by specially trained
personnel who are familiar with the characteristics of the
particular device.
- Observe the relevant instructions in section „Standards and
specifications".
7.2

Preparatory activities

(Prior to application of primary voltage)
- Check the circuit-breaker for any kind of damage or other
injurious environmental influence, and restore to the proper
condition where necessary.
- Remove any contamination, particularly on insulating parts,
which has occurred during transit, storage or installation.
- Lifting lugs for high current circuit-breakers, if still fitted,
must be removed.
- Check the primary and secondary connections and the
protectiv conductor terminal.
- Check mechanical and electrical interlocks for effectiveness,
without using force.
- Charge the spring energy storage mechanism by hand (see
section „Charging the spring energy storage mechanism").
- For test purposes, switch the mechanism on and off using
the mechanical operating elements 11 or 12 (note in this
context any specified design supply voltage and any inter-
locks installed).
- Check the charging motor on circuit-breakers with motor-
operated mechanisms by applying supply voltage.
- On motor-driven withdrawable parts, check the direction
of rotation of the travel motors as described in section
„Checking the direction of rotation of the travel motors ...".
- For any further questions on the functions of the with-
drawable circuit-breaker part and its testing, see section
„Testing withdrawable parts".
- Ensure that the Instruction Manual is available to the opera-
tors at all times.
7.3 Movement of the withdrawable breaker part
(Figures 4/1, 4/2, 4/3, 7/1 to 7/4)
Perform switching operations with the front doors shut.
7.3.1 Manual insertion from the test/disconnected position
to the service position
- Connect control wiring plug 8.1.
- Close the front door.
- Ensure that the circuit-breaker is in the OFF position.
- Fit hand crank 5 on square spigot 4.2 of the spindle
mechanism 4.
Instruction manual 534/01 | VD4 Vacuum-circuit-breaker 27