ABB VD4G-25 Installation And Operating Instructions Manual page 31

M E D I U M V O LTA G E P R O D U C T S
T3
COMPONENT INSPECTED
1 Insulation resistance
2 Auxiliary circuits.
3
Manual operating
mechanism.
4 Motor operator
(if applicable).
5 Undervoltage release
(if provided).
6 Shunt opening release and
additional shunt opening
release (if provided).
7 Shunt closing release
(if provided).
8
Key lock (if applicable)
9 Locking electromagnet
(-RLE1) (if applicable).
10 Auxiliary contacts in
operating mechanism.
11 Locking electromagnet on
circuit-breaker truck (-RLE2)
(if applicable).
12 Transmitted auxiliary
contacts for signaling circuit-
breaker connected,
disconnected (UniGear
switchgear or PowerCube
modules).
PROCEDURE
Medium voltage circuit
Using a 2500 V Megger, measure insulation resistance between
phases and earth of circuit.
Auxiliary circuits
Using a 500 V Megger (installed equipment permitting), measure
insulation resistance between auxiliary circuits and earth.
Make sure that connections to control circuit are correct: proceed
with relative power supply.
Perform a few closing and opening operations (see chap. 6).
NOTE. Supply undervoltage release and locking magnet on
operating mechanism at the relative rated voltage (if applicable).
Supply spring loading gearmotor at the relative rated voltage.
Perform a few closing and opening operations.
NOTE. Supply undervoltage release and locking magnet on
operating mechanism at the relative rated voltage (if applicable).
Supply undervoltage release at relative rated voltage and perform
circuit-breaker closing operation.
Disconnect release from voltage supply.
Close circuit-breaker and supply shunt opening release at relative
rated voltage.
Open circuit-breaker and supply shunt closing release at relative
rated voltage.
Open circuit-breaker, press and hold opening pushbutton, then
turn key and remove it from its seat.
Attempt circuit-breaker closing operation.
Insert key again and turn it through 90°.
Perform closing operation.
Attempt to close circuit-breaker both manually and electrically with
circuit-breaker open, spring loaded and locking electromagnet
de-energized.
Connect auxiliary contacts to suitable signaling circuits.
Perform a few closing and opening operations.
Attempt to rack-in circuit-breaker with circuit-breaker open, in
isolated for test position and locking electromagnet de-energized.
Energize locking electromagnet and perform racking-in operation.
Connect auxiliary contacts to suitable signaling circuits.
With circuit-breaker racked-in to enclosure, perform a few
operations from isolated for test position to connected position.
Move circuit-breaker to withdrawn position..
POSITIVE CHECK
The insulation resistance should be at least 50
Mohm and in any case, constant over time.
The insulation resistance should be a few Mohm
and, in any case, constant over time.
Operations and signals are normal.
The operations and relative signals take place
correctly.
Spring is loaded correctly.
Signals are normal.
Gearmotor stops when springs have been loaded.
Gearmotor reloads springs after each closing
operation.
Circuit-breaker closes correctly.
Signals are normal.
Circuit-breaker opens.
Signal changes over.
Circuit-breaker opens correctly.
Signals are normal.
Circuit-breaker closes correctly.
Signals are normal.
Neither manual nor electric closing takes place.
Both electrical and manual closing take place
correctly; in this position the key cannot be
removed.
Closing fails to occur.
Signaling occurs normally.
Racking-in fails to occur.
Racking-in occurs correctly.
Signals due to the operations occur normally.
31