Testing Of Interlock Conditions; Breaker Pole; Servicing; Switching Devices In General - ABB VD4 Instruction Manual

Move the withdrawable part out of the test/disconnected
■
position towards the service position with a few turns of
the crank 146.
Slowly move the withdrawable part back to the stop.
■
Auxiliary switch S8 must then operate when the hand crank
■
has a remaining angle of + 60 of turn to reach the stop.
Slowly insert the withdrawable part from the test/disconnected
■
position towards the service position until auxiliary switch
S8 just operates.
In this position, it must still just be possible to move closing
push rod 55.2. For this test, the function of the blocking
magnet Y0 (if fitted) must be deactivated manually.
This condition ensures that the electrical interlock takes effect
before the mechanical interlock in the motion sequence
involved.
2. Settings in the area of the service position
Move the withdrawable part out of the limit position
■
towards the test/disconnected position with a few turns of
the crank 146.
Slowly move the withdrawable part forwards again to the
■
stop.
Auxiliary switch S9 must then operate when the hand crank
■
has a remaining angle of + 60 of turn to reach the stop.

7.2.4 Testing of interlock conditions

(Figures 6/4, 6/6, 2/4, 2/5 and 7/2)
The testing procedures for the withdrawable part.
1. The withdrawable part must only be movable from the
test/disconnected position into the service position when
the circuit-breaker is open.
Check the following conditions individually:
With the circuit-breaker closed, insertion of the withdrawable
■
part towards the service position must be blocked after
only half a turn of the crank in the clockwise direction.
With the earthing switch closed, insertion of the withdrawable
■
part towards the service position must be blocked after
only two clockwise turns of the crank.
Do not use force !
2. The withdrawable part must only be movable from the
service position into the test/disconnected position with
the circuit-breaker open.
Check this condition as follows:
With the circuit-breaker closed, withdrawal movement of
■
the withdrawable part must be blocked after only half a
turn of the crank in anti-clockwise direction.
3. Closing of the circuit-breaker must only be possible when
26 Maintenance | VD4 Vacuum Circuit-breaker
the withdrawable part is in the defined test/disconnected
position or service position.
The control wiring plug 10.2 must previously have been
inserted.
Check this condition as follows:
It must not be possible to close the circuit-breaker with the
■
withdrawable part in any position between the test/disconnected
position and the service position.
Enabling of switching when the withdrawable part moves
■
into the service position is effected electrically by operation
of auxiliary switch S9 in the breaker housing.
For motion into the test/disconnected position, the same
■
enabling conditions apply analogously, in this case by means
of auxiliary switch S8 in the breaker housing.
4. It must only be possible to open the circuit-breaker
(manually) when the withdrawable part is in the service
position or test/disconnected position and the control
voltage has failed.

7.2.5 Breaker pole

No inspection of the breaker pole above and beyond the
stipulations of section 7.2.1 is necessary.

7.3 Servicing

7.3.1 Switching devices in general

If cleaning is found to be necessary during inspections as
set out in 7.2.1, the following procedure is to be adopted:
Prior to cleaning, the working area is to be isolated and
■
secured against reclosing where necessary in accordance
with the safety regulations.
Cleaning of surfaces in general:
■
Dry, lightly adhering dust deposits with a soft, dry cloth.
■
More strongly adhering contamination with slightly
■
alkaline household cleanser or Rivolta BWR 210.
Cleaning of the insulating material surfaces and conductive
■
components:
Light contamination:
■
with Rivolta BWR 210.
Strongly adhering contamination:
■
with cold cleanser 716.
Wipe down after cleaning, using clean water, and dry
properly.
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 cleansers, and in no case 1.1.1-