15
Scope of functional testing:
• Connect the supply voltage.
• Perform several switching operations under no
load. This is predominantly applicable to circuit-
breakers which are rarely operated under normal
circumstances.
To check the storage capacitor, switch the
circuit-breaker rapidly OFF-ON-OFF once,
pressing push-buttons 3 and 4 rapidly in
succession.
• The LEDs on the inductive proximity switches 15
and 16 are activated when the circuit-breaker
has reached its OFF and ON limit positions.
7.2.3
Withdrawable part
• The inspection should always include a visual
examination of the withdrawable part assembly.
Special attention is to be paid to those parts
which may possibly be damaged by improper
handling.
• Perform a visual check on the condition of the
isolating contact system. It is recommended that
the contact system be turned alternately so that
its inner contact points can be cleaned.
If there are signs of impermissible overheating
(discoloured surface), the contact points are to
be cleaned (see the section on repairs).
• The interlock conditions and the ease of
movement of the withdrawable assembly are to
be checked as described under “Repair”.
When checking the interlock conditions, it is es-
sential to ensure that no force is used.
Maximum torque 25 Nm!
7.3
Servicing
7.3.1
Circuit-breaker in general
If the necessity of cleaning is established during
inspections as described in 7.2.1, the following
procedure is to be adopted:
• Prior to cleaning, isolate and secure the working
area if necessary in accordance with the safety
regulations of DIN VDE and IEC.
• Observe the procedure for capacitor discharge
as set down in section 7.1.
• Cleaning of surfaces in general:
– Remove weakly adhering dry dust deposits
with a soft dry cloth.
– Remove more strongly adhering dirt with a
slightly alkaline household cleanser, or with
Rivolta BWR 210.
• Cleaning of insulating material surfaces and
conductive parts:
– Minor contamination: with Rivolta BWR 210.
– Strongly adhering contamination: with cold
cleanser 716
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 mainte-
nance-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
maintenance-free 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
DC test voltage
the circuit-breaker
12 kV
40 kV
17.5 kV
40 kV
24 kV
60 kV.
Testing is to be performed at the rated contact
distance in the OFF 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.
