22
SPEAR™ Single-Phase Recloser System
INSTALLATION AND OPERATION INSTRUCTIONS
MN280048EN June 2016
Grounding with a remote supply voltage transformer;
4-wire multi-grounded
Installation of a SPEAR single-phase recloser control with a
local supply voltage transformer must include the following:
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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.
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 SPEAR single-phase recloser
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
Distance between transformer and recloser should be one
pole span or less.
WARNING
Hazardous voltage . Recloser and control must be
solidly grounded . Follow all locally approved procedures
and safety practices when grounding this equipment .
Improper grounding can result in contact with high
voltage, which will cause death or severe personal
injury .
G115 .1
Figure 20 .
Surge
Arrester
Recloser
Head
Ground
Supply
Voltage
Pole
Ground
SPEAR Recloser
Pole
Surge
Arrester
Transformer
Arrester
Ground
SPEAR Control
HOT
NEU
GND
NEU AC
Input Terminal Block
Control Cable
Surge
Arrester
Customer Ground
Connection at
External Lug
AC
NEUTRAL
SPEAR Control
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS - Remote dedicated supply
transformer
Input
Terminal
Block X1
External
Ground Lug
Note:
Distance between
transformer and
recloser should be
one pole span or
less.
System
Neutral
Pole
Surge
Arrester
Recloser
Head
Ground
Supply
Voltage
Pole
Ground
Pole
SPEAR Recloser
Pole
Surge
Arrester
Transformer
Arrester
Ground
SPEAR Control
HOT
NEU
GND
NEU AC
Input Terminal Block
Control Cable
Surge
Arrester
Arrester
Ground
Customer Ground Connection
at External Lug
AC
NEUTRAL
SPEAR Control
Supply Voltage
Transformer
ELECTRICAL CONNECTIONS - Remote dedicated supply
transformer
Input
Terminal
Block X1
External
Ground Lug
Note:
Distance between
transformer and
recloser should be
one pole span or
less.
System
Neutral
Recommended grounding method for the
SPEAR single-phase recloser control installed on 4-wire
multi-grounded with remote supply voltage transformer
