Inspection And Functional Testing; Circuit-Breaker In General; Magnetic Actuator Operating Mechanism; Lock And Release Device Withdrawable Assembly - ABB VM1 Instruction Manual

7.2

Inspection and functional testing

7.2.1

Circuit-breaker in general

- Under normal operating conditions, inspection within the
stated number of operating cycles is not necessary.
- Inspection may be necessary under exceptional operating
conditions (including adverse climatic conditions) and/or
particular environmental stresses (e.g. serious contamina-
tion and aggressive air).
- The inspection primarily comprises visual exa mina tion for
contamination, corrosion, moisture and discharge phe-
nomena on the high voltage side.
If an irregular condition is found, appropriate maintenance
work is to be initiated.
- No external discharge may occur on the surfaces of equip-
ment at operating voltage. This can, for example, be de-
tected by characteristic noises, a clearly perceptible smell
of ozone, or visible glowing in the dark.
- If irregular conditions are detected, then corresponding
repair measures should be initiated.
7.2.2

Magnetic actuator operating mechanism

(Figures 9/17 and 9/26)
A first functional test of the operating mechanism is to be
performed:
- after the stated number of operating cycles, or
- during maintenance work as described in section 7.2.1.
Before the functional test, open the circuit-breaker and
- move it into the test position (withdrawable breaker) or
- isolate and secure the working area in accordance with
the Safety Regulations to DIN VDE / IEC (with stationary
mounted breakers).
- Observe the procedure for capacitor discharge as set
down in section 7.1.
- Perform visual examination of the condition (removing front
plate 1.1), e.g.:
- the lubrication at the rotary bearings,
- the operating cycle counter,
- the sensor mounting,
- the position indicator.
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.
16 VM1 Vacuum circuit-breaker | Instruction manual 504/05
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 sec-
tion 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 essential 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 inspec-
tions 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-tri-
chloroethane, 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.