MN008006EN Manual
Efective March 2021
NOVA LBS Load Break Switch
20
www.eaton.com/cooperpowerseries
SERVICE INFORMATION
Service Requirements
The NOVA LBS switch is designed for a minimum mechanical life of
10,000 operations, which is class M2 according to IEC-62271-103. The
NOVA LBS switch should be inspected every 10 years for physical
damage and correct operation.
Frequency of Inspection
Because these switches are applied under widely varying operating and
climatic conditions, service intervals are best determined by the user
based on actual operating experience. However, solid-insulated,
vacuum-interrupting switches should be inspected every ten years.
Testing Operation
This switch is used with Eaton microprocessor-based NOVA LBS control.
Refer to the control operation manual.
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This equipment is not intended to protect human life. Follow all locally
approved procedures and safety practices when installing or operating
this equipment. Failure to comply can result in death, severe personal
injury and equipment damage.
1.
Check the data plate ratings
. Make sure the ratings, settings,
and interface options on the switch data plate (Figure 6) are
correct for the planned testing.
2.
Test electrical open and close operation.
Close and open the
switch contacts using the microprocessor control. Confirm that
the contacts have closed and opened by:
A.
The OPEN/CLOSE contact position indicator, or
B.
By a continuity check between the switch terminals.
3.
Test manual open.
Pull the yellow manual open handle (Figure
14) down to open the switch contacts. Confirm that the contacts
have opened by:
A.
The OPEN/CLOSE contact position indicator, or
B.
By a continuity check between the switch terminals.
4.
To close the NOVA LBS contacts
A.
First
push up the GREEN manual opening handle;
B.
Close the NOVA LBS switch using the LBC control. To
perform Manual Closing, pull down the closing lever 7
times.
High-Potential Withstand Testing
The following equipment is required for this test:
High-voltage test set
– Must be capable of supplying suitable voltages
for determining the dielectric withstand capability of the switch.
Sensitive circuit breakers should be included to prevent damage in the
event of a flashover.
Note
: Test results for NOVA switches 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.
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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.
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.
Use the following procedures to perform high-potential withstand tests
at 75% of the rated low-frequency withstand voltage for 60 seconds.
Refer to Table 8 for test voltages and Figure 25 for test connection
diagrams.
Test results for NOVA switches equipped with the internal voltage
sensing option will be influenced by the source-to ground connected
sensing resistor.
TABLE 8 – NOVA LBS withstand test voltage ratings information
75% of Rated Low-Frequency Withstand Voltage
(1-minute dry) (kV rms)
Model
CA
NOVA LBS 15
37,5
NOVA LBS 27
45,0
1.
Approximately 0.53 mA additional leakage current per phase with internal voltage
sensors.
2.
Approximately 0.32 mA additional leakage current per phase with internal voltage
sensors.
