Magnetic Actuator Operating Mechanism; Breaker Pole; Repair; Repair Of Surface Damage - ABB VM1 Manual

M E D I U M V O LTA G E P R O D U C T S
After cleaning, wipe down with clean water and
dry carefully.
• Observe the manufacturer's instructions and the
special ABB instruction manuals BA 1002/E or BA
1006/E on safety at work.
Note:
Use only halogen-free cleaning agents. Never use 1.1.1-trichloroethane,
trichloroethylene or carbon tetrachloride!
7.3.2

Magnetic actuator operating mechanism

The magnetic actuator mechanism is
maintenance-free up to the number of operating
cycles stated in section 7.1.
7.3.3

Breaker pole

The breaker pole with the vacuum interrupter is
maintenancefree up to the permissible number of
operating cycles as sent down in section 10.1.3.
The working life of the vacuum interrupter is
defined by the sum current limit corresponding to
the equipment data in individual cases in
accordance with section 10.1.3:
• When the sum current limit is reached, the
complete breaker poles are to be replaced.
Note:
Dismantling and replacement of the breaker poles should only be
performed by the ABB after-sales service or adequately trained specialist
staff, in particular with regard to the necessity for precise setting.
The following equipment, for example, can be
used to check the vacuum (without dismantling
the circuit breaker):
VIDAR vacuum tester,
from Programma Electric GmbH
Bad Homburg v.d.H. Germany
The following test values have to be set for
checking of the internal interrupter chamber
pressure with the VIDAR vacuum tester:
Rated voltage of
the circuit breaker
1 2 kV
17.5 kV
24 kV
Testing is to be performed at the rated contact
distance in theOFF condition.
Procedure for vacuum interrupter testing for
stationary mounted switching devices:
• Isolate and secure the working area in accordance
with the Safety Regulations to DIN VDE / IEC.
• Open the VM1 circuit breaker.
• Earth all poles of the VM1 circuit breaker on one
side.
• Connect the earthed test lead of the VIDAR
vacuum tester conductively to the station earth.
• Connect the high voltage test lead of the VIDAR
Note:
Connected cables may lead to a "defective" indication on the vacuum
tester as a result of their cable capacitance. In such cases, the cables are
to be removed.
7.4
7.4.1
Circuit breaker part in general
Sheet steel parts, painted:
• Remove rust, e.g. with a wire brush.
• Grind off paint coat and degrease.
• Apply anti-rust primer and top coat.
• Use a top coat in the standard colour
• RAL 7035 or the relevant special colour.
Sheet steel parts with aluminium-zinc surfaces
and chromated functional parts:
• Remove white rust, with a wire brush or cleaning
• Remove loosely adhering particles with a dry cloth.
• Apply zinc spray or zinc dust primer.
Functional parts, phosphated:
• Remove rust, with a wire brush or cleaning pad
• Clean with a dry cloth.
• Grease with Isoflex Topas NB 52 lubricant.
Withdrawable circuit breaker part in general:
• Where required, regrease or thoroughly clean slide
DC test voltage
40 kV
40 kV
60 kV
Note:
The set installation position of contact arms 34 must not be
changed by the improper use of force.
vacuum tester with phase L1 of the unearthed pole
side and test the vacuum interrupter chamber with
the circuit breaker contact gap open. Repeat for
phases L2 and L3.

Repair

Repair of surface damage:

pad (e.g. Scotch-Brite, white).
(e.g. Scotch-Brite, white).
plates and bearings in the panel and regrease
them with Isoflex NB 52 lubricant.
Remove the contact system for thoroughly
cleaning as described below (Figures 9/24 and
9/25):
- Slide the two inner annular tension springs 34.2
facing the breaker pole to a position beside the
other two outer annual tension springs, thus
releasing contact system 34.1, and remove the
contact system from contact arm 34.
- The contact pin of the contact system and the
slot on the contact arm are to be cleaned and
greased.
- Fit the contact system back to front on the thin
end of arbor 39, and slide it forwards onto the
thicker part of the shank.
- Fit arbor 39 onto the relevant contact arm 34,
slide the contact system 34.1 over onto the
contact arm, and withdraw the arbor.
- Check all contact fingers and annular tension
springs for perfect fit.
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