Pole-Units and Control Cabinet
During routine transformer maintenance and/
or inspections, the Trans-Rupter II should be
visually inspected for the following:
• Excessive corrosion at the terminal pads.
• Discoloration, contamination, or other dam-
age to the pole-unit insulation.
• Excessive terminal-pad loading.
• Excessive corrosion or water ingress inside
the control cabinet.
• That the gas-pressure gauge is in the white
“OK” to operate zone. See Figure 85. If the
gas-pressure gauge is in either the yellow or
red zones, the gas density in the pole-unit
has dropped. Refer to the instructions on
page 40 for “Understanding the Gas-Pressure
Gauge.”
Ç
WARNING
DO NOT open the Trans-Rupter II unless the
needle on each pole-unit gas-pressure gauge
is in the “OK” to operate zone .
Opening the Trans-Rupter II with one or
more pole-units in the “REPLACE” zone
can damage the transformer.
Manual-Trip Device and Trip-Energy
Supply
Verify the following:
• Proper condition of the manual-trip device.
Crank it 5 to 10 times. Check that the red
LED is flashing. See Figure 86.
• That the trip-energy supply is storing energy.
Open the swingout panel to access the cir-
cuit board of the trip-energy supply. Press
the push button on the trip-energy supply’s
circuit board. See Figure 87. If the trip energy
supply is functioning properly, the red LED
on the board will light continuously.
The trip-energy supply requires 350 mA
of three-phase secondary current or 600 mA
of single-phase secondary current to power
up. Refer to S&C Data Bulletin 731-60 for
complete information about the trip energy
supply.
If any of these conditions are found, notify
S&C Electric Company.
Inspection Recommendations
Figure 85. Check that the gas-pressure gauge on each pole-unit is in the
“OK” to operate zone.
“OK” to
operate zone
Figure 86. Crank the manual-trip device handle 5 to 10 times until the red
LED starts flashing.
Manual-trip
device handle
Red LED
Figure 87. To verify the trip-energy supply is storing energy, press the
push button on the trip-energy supply circuit board. The red LED will light
continuously if the trip-energy supply is functioning properly.
Trip-energy
supply
Red LED
Push button
S&C Instruction Sheet 731-502
43
