18
Service information
INSTALLATION AND OPERATION INSTRUCTIONS
MN280103EN March 2023 www.eaton.com
Figure 16 . Connection diagrams for high-potential
withstand testing for each single-phase recloser
that comprises the NOVA NX-STS recloser system
Test 2
1.
Close the recloser contacts.
2.
Ground the recloser.
3.
Ground terminal 2 and terminal 6.
4.
Apply test voltage to terminal 3.
5.
The recloser should withstand the test voltage for
60 seconds.
Test 3
1.
Open the recloser contacts.
2.
Ground the recloser.
3.
Connect and ground terminals 1, 3, and 5
(see
).
4.
Connect terminals 2, 4, and 6.
5.
Apply proper test voltage to terminals 2, 4, and 6.
6.
The recloser should withstand the test voltage for
60 seconds.
7.
Reverse the connections: ground terminals 2, 4, and 6.
8.
Apply test voltage to terminals 1, 3, and 5 for
60 seconds.
9.
The recloser should withstand the test voltage for
60 seconds.
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 a recloser fails the closed-contacts test, the cause is likely
to be a diminished electrical clearance or failed insulation.
If the recloser does not pass Tests 1, 2, or 3, contact an
authorized service center or your Eaton representative.
ote:
N
Test results for NOVA NX-STS reclosers equipped
with voltage-sensing options may be influenced by
the sensing resistor, especially if DC high-potential
testing is performed.
6
4
2
5
3
1
Source
Load