Cooper S280-79-10 Install And Operation Instructions page 36

Kyle Form 5, Form 5 UDP, Form 5 DC NOVA Recloser Control Installation and Operation Instructions
Grounding with a Remote Supply Voltage Transformer; 4-Wire Multi-Grounded,
3-Wire Ungrounded, or Impedance-Grounded
Installation of a Form 5 control with a remote supply volt-
age transformer must include the following:
• Protection of the recloser bushings and the supplying
transformer with lightning arresters.
• Grounding of the recloser head and tank.
• Grounding of the transformer tank.
• Grounding of the control cabinet.
• Grounding of the SCADA equipment
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS - Remote dedicated
Figure 30.
Recommended grounding method for the Form 5 Control installed on 4-wire multi-grounded, 3-wire
ungrounded, or impedance-grounded systems with remote supply voltage transformer.
36
Form 5 LS Control
AC
NEUTRAL
External
Ground Lug
supply transformer
Transformer
HOT
NEU
GND
Note: Distance between
transformer and
recloser should be
one pole span or
less
Supply
Voltage
Pole
Ground
Pole
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 and the
control.
IMPORTANT: All external inputs to the Form 5 con-
trol must be routed within 8 inches of their correspond-
ing ground. During a surge, a potential of
approximately 1.5kV per foot can develop in the con-
ductors. Differences between conductor and ground
path lengths can add additional stress to the control
components in the event of a power surge.
Low Voltage Distribution Network
Input
Input
Terminal
Terminal
Form 5 LS Control
Block
Block
AC
NEUTRAL
External
Ground Lug
ELECTRICAL CONNECTIONS - using isolation transformer
Surge
Arrester
Surge
Arrester
Arrester
Ground
Control Cable
Pole
Form 5 LS Control
Input Terminal Block
Customer Ground Connection
at External Lug
115 Vac
Supply Voltage
Local Isolation
Transformer
Customer
Supplied
Low Voltage
Low Voltage
Arrester
Surge
Arrester
Recloser
Head
Ground
Arrester
Ground
System
Neutral
Recloser