10
Effective January 2017
NOVA
®
15i, NOVA 27i, and NOVA 38i; Three-phase
microprocessor-controlled; installation and operation
instructions (S280-43-1)
Instructional Literature
IL0104001E
Grounding with a local supply voltage trans-
former: 4-wire multi-grounded, 3-wire
ungrounded, or impedance-grounded
Installation with a local supply voltage transformer must include
the following (refer to Figure 10):
• 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.
1. 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. It is recommended to use a
minimum of 50 sq mm copper wire for the pole ground connection to the
recloser.
2. Any ground wire of the equipment is not allowed to be connected to the
neutral line.
3. Recommended grounding resistance value is 4
Ω
.
Grounding with a remote supply voltage trans-
former: 4-wire multi-grounded, 3-wire
ungrounded, or impedance-grounded
Installation with a remote supply voltage transformer must include
the following (refer to Figure 11):
• 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.
Figure 10.
Recommended grounding method for NOVA i recloser
with microprocessor-based control and local supply
voltage transformer.
Figure 11.
Recommended grounding method for NOVA i reclosers
with microprocessor-based control and remote supply
voltage transformer.
CONTROLLER
CONTROLLER
