Installation And Mounting Of The Breaker; Commissioning/Operation; Note On Safety At Work; Preparatory Activities - ABB VM1 Instruction Manual

5

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 distor-
tion, placing a dished washer under the nut and bolt head
at each of the four mounting points (depending on the
order).
- Connect the main terminals without any residual 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.
- Observe the tested terminal zone where appropriate.
- Use DIN bolts of tensile class 8.8 together with dished
washers to fasten the conductor bars.
- Only use the tightening torques shown in the following
table.
- Remove any contamination (see also section 7.3.1.)
Thread
M 6
M 8
M 10
M 12
M 16
The rated tightening torques for fasteners without lubrication are based on
1)
a coefficient of friction for the thread of 0.14 (the actual values are subject to an
unavoidable, partly not inconsiderable, spread).
Rated tightening torques for fasteners with lubrication in accordance with
DIN 43 673.
Thread and head contact surface lubricated.
2)
Any tightening torques which deviate from those in the general table (e.g. for
contact systems or device terminals) are to be taken into account as stated in the
detailed technical documentation. It is recommended that the threads and head
contact surfaces of the bolts should be lightly oiled or greased, so as to achieve
a precise rated tightening torque.
12 VM1 Vacuum circuit-breaker | Instruction manual 504/05
Recommended
tightening torque
1)
Nm
Lubricant 2)
Without (dry) Oil or grease
10.5 4.5
26,0 10,0
50,0 20,0
86,0 40,0
200,0 80,0
6 Commissioning / Operation
6.1 Notes on safety at work
(Figure 9/17)
- Operation is only permissible by specially trained
personnel who are familiar with the characteristics
of the particular switching device.
- Observe the relevant specifications as set out in
section 1.2.
- Before a VM1 on a withdrawable part is moved it
must be verified that the circuit-breaker is switched
off. This is the case when the mechanical posi-
tion indicator 6 shows the position "O" and when
"READY" is shining on the ready lamp 2 while the
breaker is supplied with auxiliary voltage.
- Due to safety reasons, the circuit-breaker has to
be treated as "switched on" if the switching posi-
tion can not be clearly determined.
In this case all high voltage connections to the
breaker have to be de-energized and zero potential
on the primary side of the breaker has to be con-
firmed prior to commissioning, operation, mainte-
nance or repair work.
- The discharge energy of the storage capacitor
is greater than 350 mJ. The procedure for discharge
of the storage capacitor as set out in section 7.1 is
to be observed.
6.2

Preparatory activities

(before connecting the primary voltage)
- Check the circuit-breaker, withdrawable part, contact arms,
insulating parts etc. for damage, and restore to their proper
condition if necessary.
- Remove any dirt collected during transport, storage or
installation (particularly on the insulating materials) as de-
scribed in section 7.3.1.
- Remove lifting lugs T (Figures 10/1 to 10/7).
- Check the primary and secondary connections and the
protective earth conductor connection.
- Check the connection of the main earthing bar with the
station earthing conductor (DIN VDE 0141).
- Remove all material residues, foreign bodies and tools from
the switchgear.
- Properly refit all covers, etc., removed during assembly and
testing processes.
- Connect the supply voltage (Figures 9/16b and 10/10 to
10/13) - "READY" will shine. Inputs -RL1: "Closing lock-out"
and -MU : "Undervoltage release" (if applicable) must be
3)
supplied with power before the circuit-breaker can be closed.
- For this reason, an internal circuit applies a voltage of
80 V to the input -RL1 (Figure 9/16b), as soon as the
storage capacitor is charged in as-delivered condition of
devices with no connector wiring.
- In case this input -RL1 is being used for an interlocking
with an external voltage, this internal connection to 80 V
has to be removed.
- "READY" will shine even if the closing operation is blocked
by inputs -RL1 or -MU
3)
Full version on the control module, optional
3)
.