21
NOVA
®
15i, NOVA 27i, and NOVA 38i; Three-phase
microprocessor-controlled; installation and operation
instructions (S280-43-1)
Instructional Literature
IL0104001E
Effective January 2017
Withstand test results
The high-potential withstand tests provide information on the
dielectric condition of the recloser and the vacuum integrity of the
interrupters.
If the recloser passes the closed-contacts tests (Tests 1 and 2), but
fails the open-contacts test (Test 3), the cause is likely to be in the
interrupter assembly. Retest each phase individually to determine
the failed phase or phases.
If the recloser does not pass Tests 1, 2, or 3, contact an authorized
service center or your Cooper Power Systems representative.
Test results for NOVA i reclosers equipped with the internal
voltage sensing option will be influenced by the source-to-ground
connected sensing resistor, especially if dc high-potential testing is
performed.
Inspection of nova i module
If the NOVA i module was exposed to an external flashover, an
inspection process is recommended to assure proper operation of
the recloser. Should the NOVA i exhibit external flashover
attributes (carbon tracking or discoloration), the following proce-
dure is recommended to restore the encapsulation back to its
original condition:
1.
Bypass and remove the recloser from service as described
in this manual.
2.
Inspect module for damage to the terminals. Remove any
damaged terminals and replace.
3.
Inspect module for damage to the module rods. If there is
damage to the module rods, the conductor module must be
replaced.
4.
Verify through careful inspection that there is no damage to
the housing that could inhibit proper operation. Check the
integrity of the lifting lugs.
5.
Clean the damaged module with isopropyl alcohol and a
scratch-free, nylon scouring pad to remove any carbon
deposit.
6.
Confirm the dielectric strength of the module by performing
high-potential withstand testing. Confirm both
phase-to-ground and phase-to-phase conditions. See the
High-Potential Withstand Testing section of this manual.
Troubleshooting
If the NOVA i recloser does not perform as described in the
OPERATION section of this manual, the following information may
assist in troubleshooting:
Unit will not close
• Make sure the yellow manual open handle is completely up.
• Check all cables for proper connection.
• Verify that the control has power.
• Upon loss of ac power, check recloser control battery level.
• Check the fusing on the dc-to-dc converter board located in the
control cabinet.
Unit will not open electrically
• Check all cables for proper connection.
• Verify that the control has power.
• Check the fusing on the dc-to-dc converter board located in the
control cabinet.
