17
NOVA™ STS Single-Tank, Triple-Single, Electronically Controlled Recloser
INSTALLATION AND OPERATION INSTRUCTIONS
MN280046EN May 2016
High-potential withstand testing
Eaton’s Cooper Power series NOVA-STS reclosers are
carefully tested and adjusted at the factory to operate
according to the published data. Each recloser leaves the
factory ready for installation, but to ensure there was no
damage during transportation, Eaton recommends high
potential withstand tests before installation.
To verify the dielectric integrity of the recloser, the following
tests and equipment are recommended:
High-voltage test set – Must be capable of supplying
suitable voltages for determining the dielectric withstand
capability of the recloser. Sensitive circuit breakers should
be included to prevent damage in the event of a flashover.
otee:
N
Test results for NOVA 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.
WARNING
Hazardous voltage . The switchgear (apparatus and
control) and high-voltage transformer must be in a test
cage or similar protected area to prevent accidental
contact with the high-voltage parts . Solidly ground all
equipment . Failure to comply can result in death, severe
personal injury, and equipment damage .
T221 .5
CAUTION
Radiation . At voltages up to the specified test voltages,
the radiation emitted by the vacuum interrupter is
negligible . However, above these voltages, radiation
injurious to personnel can be emitted . See
Service
Information S280-90-1, Vacuum Interrupter Withstand
Test Voltage Ratings Information
for further information .
G109 .2
Use the procedures on page 18 to perform high-potential
withstand tests at 75% of the rated low-frequency
withstand voltage for 60 seconds. See Table 15 for test
voltages and Figure 16 for test connection diagrams.
Table 15 . NOVA STS Recloser Withstand Test Voltage
Ratings Information
Description
75% of Rated Low-Frequency Withstand
Voltage (1 minute dry) (kV rms)
AC
DC
NOVA STS 15
37.5
53.0*
NOVA STS 27
45.0
63.6**
NOVA STS 38
52.5
74.2***
* Approximately 0.53 mA additional leakage current per phase with
internal voltage sensors.
** Approximately 0.32 mA additional leakage current per phase with
internal voltage sensors.
*** Approximately 0.37 mA additional leakage current per phase with
internal voltage sensors.
1
3
5
2
4
6
ac
TEST 1
PHASE TO GROUND
1
3
5
2
4
6
ac
TEST 2
PHASE TO PHASE
1
3
5
2
4
6
ac
OPEN CONTACT
1
3
5
2
4
6
ac
OPEN CONTACT
TEST 3
Load Side
Source Side
6
2
4
3
1
5
Figure 16 . Terminal identification (top) and connection
diagrams (bottom) for high-potential withstand testing .
