7
NOVA™ STS Single-Tank, Triple-Single, Electronically Controlled Recloser
INSTALLATION AND OPERATION INSTRUCTIONS
MN280046EN May 2016
6. Disconnect the control battery.
7. For the Form 6 Triple-Single control, remove the control
AC sensing and power connections from the control
using a separate disconnect switch.
IMPORTANT
Disconnect switches for AC sensing and power connections
are necessary to isolate the Form 6 control for testing and
servicing.
CAUTION
Hazardous voltage . Open CT secondaries can generate
high voltages . Contact with CT pins of the disconnected
cable can cause electric shock and may result in
personal injury . Open recloser contacts and open
disconnect switches before disconnecting control cable .
T204 .3
CAUTION
Hazardous voltage . Cable conductors attached to
controls will remain at 53 Vdc and 120/240 Vac potential
while connected to the control . Contact with any pins
at the end of the cable directly or indirectly connected
to a control can result in personal injury or equipment
damage . Disconnect battery and external power sources
in the control then remove control cable at control end
before disconnecting from recloser end .
T312 .3
8. Disconnect the control cable from the recloser.
otee:
N
Do not disconnect the recloser control cable from
the recloser unless all of the above steps have been
completed. The Form 6 Triple-Single control in
1-phase trip/3-phase lockout mode or 3-phase trip/3-
phase lockout mode will lock out all three reclosers if
the control cable is disconnected.
9. Disconnect heater power cable from the recloser tank.
10. Follow standard utility procedures regarding removal of
recloser from service.
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Eaton recommends transporting Cooper Power
series NOVA reclosers in the closed position to maxi-
mize the operational performance of the unit.
Grounding the NOVA STS recloser
IMPORTANT
In pole-mounted applications, a ground connection must
be made between the recloser, transformer, recloser
control, and SCADA equipment for proper protection of the
equipment. The pole ground must be sized per local utility
practices to minimize the impedance between the recloser
ground and the control ground.
IMPORTANT
All external inputs to the Form 6-TS control must be routed
within 8 inches of their corresponding ground. During a
surge, a potential of approximately 1.5 kV per foot can
develop in the conductors. Differences between conductor
and ground path lengths can add additional stress to the
control components in the event of a power surge.
IMPORTANT
Any external voltage sensor installed with the NOVA STS
recloser must have its ground referenced to the recloser
ground.
Grounding with a local supply voltage
transformere: 4-wire multi-grounded, 3-wire
ungrounded, or impedance-grounded
Installation with a local supply voltage transformer must
include the following (refer to Figure 8):
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●
Protection of the recloser bushings and the supplying
transformer with lightning arresters.
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●
Grounding of the recloser head and tank.
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●
Grounding of the transformer tank.
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Grounding of the control cabinet.
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●
Grounding of the SCADA equipment.
Transformer
Surge
Arrester
Pole
Supply Voltage
(14 gauge minimum)
Pole Ground
(6 gauge minimum)
Form 6
Control
Customer Ground Connection
at external lug
NEU AC
GND
NEU
AC
Input
Terminal
Block
Control
Cable(s)
Recloser
Ground
Connecter
NOVA STS
Recloser
Arrester
Ground
Surge
Arrester
Arrestser
Ground
Surge
Arrester
Figure 8 . Recommended grounding method for NOVA
STS recloser with Form 6-TS microprocessor-based
recloser control .
