Circuit-Breaker Pole; Repairs - ABB VM1 Installation And Service Instructions Manual

8.8. Circuit-breaker pole

The circuit-breaker pole and relative vacuum interrupter are
maintenance-free up to the maximum number of electrical
operations foreseen for the type of interrupter.
The operating life of the vacuum interrupter is defined by the
sum of the ultimate currents corresponding to the specific
type of interrupter in accordance with what is indicated in the
graphs of par. "Trip curves": when the sum of the ultimate
currents is reached, the complete pole must be replaced.
note
Dismantling and replacement of the pole can only be carried out by ABB
personnel or suitably qualified and specially trained personnel, especially for the
necessary adjustments.
To carry out the interrupter test without dismantling the
circuit-breaker pole, use:
– the VIDAR vacuum tester, made by the company
Programma Electric GmbH, Bad Homberg v.d.H.
To check vacuum tightness of the interrupter, the following
test values must be set on the VIDAR tester:
To carry out the interrupter test without dismantling the
circuit-breaker pole, use:
– the VIDAR vacuum tester, made by the company
Programma Electric GmbH, Bad Homberg v.d.H.
To check vacuum tightness of the interrupter, the following
test values must be set on the VIDAR tester:
Rated voltage
of the circuit-breaker
15 KV
The test must always be carried out with the circuit- breaker
open with the contacts at the nominal distance (12 to 24 kV).
Procedure for testing the degree of vacuum of the interrupter
of the circuit-breaker poles:
– turn the power supply off and make the working area safe
by following the safety regulations specified in the IEC/DIN
VDE Standards;
– open the circuit-breaker;
– earth a terminal of each circuit-breaker pole;
– connect the earthed terminal of the VIDAR tester to the
circuit-breaker structure;
– connect the high voltage terminal of the VIDAR tester to
the terminal of the circuit-breaker pole not connected to
earth (L1 phase) and carry out the test. Repeat the test for
phases L2 and L3.
Note
The tester connection cables can produce an indication due to the capacitive
effect. In this case the cables must not be removed.
36
dC test voltage
36 KV

8.9. Repairs

Replacement of spare parts and accessories must only
be carried out by ABB personnel or suitably qualified and
specially trained personnel.
Always work with the circuit-breaker open and locked so that
it cannot be closed again, with the work area insulated and
made safe.
The drive springs must be discharged.
All power supply sources must be disconnected and made
safe against any reclosing during removal and installation
work.
Should MaintenanCe be CaRRied
out by the CuStoMeR'S PeRSonnel,
ReSPonSibility foR the inteRventionS
ReMainS with the CuStoMeR.
the RePlaCeMent of PaRtS not inCluded
in the "liSt of SPaRe PaRtS/aCCeSSoRieS"
MuSt only be CaRRied out by abb
PeRSonnel. in PaRtiCulaR:
– CoMPlete Pole with buShingS/ConneCtionS
– aCtuatoR
– tRanSMiSSion SySteM.
Caution