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Testing
All pad-mounted switchgear is carefully tested and adjusted
at the factory to operate according to published data.
Well-equipped test facilities, a detailed testing procedure
and thoroughly trained personnel assure accurately
calibrated equipment. Each unit leaves the factory ready for
installation.
Pre-installation testing is not necessary. However, should
verification of switchgear prior to installation be required,
the vacuum interrupters can be tested using the following
procedure.
High potential withstand testing of vacuum
interrupters
High potential withstand tests can be performed to
check the vacuum integrity of the interrupters used in VFI
switchgear.
Safety requirements
To prevent accidental contact with high voltage parts, the
switchgear and high-voltage transformer must be placed
in a suitable test cage and all proper grounding procedures
must be observed.
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.
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.
With the vacuum interrupters open (manual operating
handle(s) in the Open position), perform a hi-pot test for one
minute AC (or 15 minutes DC) across each open vacuum
interrupter assembly at the voltages shown in Table 3. The
interrupter should withstand the test voltage and should not
load down the source.
VFI SF6 -INSULATED INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS MN285004EN October 2015
CAUTION
Table 3. High Potential Withstand Test Voltages
VFI Voltage Rating
(kV)
15
25
35
Trip and control testing
The VFI Tester device (Figure 9) is used for testing VFI
pad-mounted units. It is self-contained and provides quick
verification of the correct operation of VFI trip mechanisms,
supervisory controls, and accessory SCADA boards.
Refer to Service Information Bulletin S285-10-7, VFI Tester
Operating Instructions for complete information regarding
operation of the VFI tester and in-depth VFI pad-mounted
switchgear testing procedures.
T221.5
Figure 9. VFI Tester Unit- Catalog Number KVFI TESTER.
G109.2
High Potential
Test Voltages
26.2 kV AC rms or 37.1 kV DC
25 30 kV AC rms or 42.4 kV DC
35 37.5 kV AC rms or 53 kV DC
7
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