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4. If no disruptive discharge occurs, the
insulation system is satisfactory.
5. Open the circuit breaker using the red
pushbutton.
6. After test, ground both ends and the
middle of each vacuum interrupter to
dissipate any static charge.
NOTICE
Capacitor discharge plug (105.2)
Disconnect control power prior to removing or
replacing the capacitor discharge plug. Refer to
Figure 2 on page 7.
To discharge capacitors:
Disconnect control power to the circuit breaker
by opening the disconnect device (device 08 in
the typical schematic in Figure 14 on page 24)
located in the control compartment.
After control power is off, disconnect the
capacitor discharge plug (105.2) from the
controller board (105.0) to discharge capacitors.
To reconnect capacitors:
Disconnect control power to the circuit breaker
by opening the disconnect (device 08 in the
typical schematic in Figure 14 on page 24)
located in the control compartment.
Insert the capacitor discharge plug (105.2) (with
six pins) into the left-hand receptacle on the
controller board (105.0). Ensure that the plug is
properly seated and the plug position is level
with the power supply connection plug (105.5)
that is located to the right of the capacitor
discharge plug.
After the capacitor discharge plug is firmly
seated, reconnect control power to the circuit
breaker (device 08 in the typical schematic in
Figure 14 on page 24).
7. Unplug the connector (105.2) to the
controller board (105.0).
8. Disconnect secondary circuits for the
operating mechanism by disconnecting
the multiple pin-plug at the lower left
corner of the operator, and connect all
pins on the operator side with a shorting
wire. Connect the shorting wire to the
high-potential lead of the high-voltage
tester, and ground the circuit breaker
housing. Starting with zero voltage,
gradually increase the test voltage to
1,500 volts rms, 60 Hz. Maintain test
voltage for one minute.
9. If no disruptive discharge occurs, the
secondary control insulation level is
satisfactory.
10. Disconnect the shorting wire, reattach
the multiple pin-plug and reattach the
plug (105.2) to the controller board
(105.0). Switch on the control power
disconnect device in the relay and
control compartment.
11. Close the circuit breaker using the black
pushbutton.
12. Open the circuit breaker using the red
pushbutton.
13. Switch off the control power disconnect
device in the relay and control
compartment, unplug the connector
(105.2) from the controller board.
14. Perform contact-resistance tests of the
primary contacts. The resistance should
be determined between the fixed-end
connection pad and the moving-end
connection pad (refer to Figure 7: Pole
assembly on page 14). Contact
resistance should not exceed the values
listed in Table 6: Maximum contact
resistance.
Inspection and cleaning of circuit breaker
insulation
Rotate the manual opening lever 90° to the
OFF position. This prevents the circuit
breaker from closing. Lock the manual
opening lever with a padlock.
1. Open the upper doors of the type SDV7-
MA circuit breaker.
2. Remove any phase barriers if furnished
(applicable for certain types only).
3. Clean barriers and post insulators (16.1)
using clean cloth dipped in isopropyl
alcohol.
4. Reinstall all barriers. Check all visible
fasteners again for condition and
tightness.
Note: Do not use any cleaning compounds
containing chlorinated hydrocarbons, such
as: trichlorethylene, perchlorethylene or
carbon tetrachloride.
These compounds will damage the
phenylene ether copolymer material used in
the barriers and other insulation on the
circuit breaker.
Contact
Current rating
resistance
A
Micro-Ohms
1,200
35
2,000
30
2,500
30
3,000
30
Table 6: Maximum contact resistance
39
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