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Diagnostics and Testing |
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09-07 |
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06-07 |
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Power cable
diagnostics
enable
consulting
engineers to
specify and
commission cable
systems." |
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06-07 |
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Energy Pulse:
Defect Specific
Cable
Diagnostics
Empowers Asset
Managers:
"Utilities,
industrial
plants, casinos,
commercial and
government
campuses, and
municipal water
treatment
facilities all
have an
abundance of
underground
shielded power
cable system
assets." |
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10-06 |
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If
you are interested in
determining the actual
condition of your cable,
off-line partial discharge
diagnostics is the only
available proven method." |
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3-05 |
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"Power cable diagnostics
are the most advanced
‘tool’ in the ‘toolbox’ of
shielded power cable
tests." |
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Wind Energy Collector
System Reliability |
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11-06 |
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"A
partial discharge
diagnostic evaluation
conducted offline at 60Hz
is presently the most
reliable and
cost-effective commission
test available." |
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09-06 |
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IEEE Cable Test Technology
and Protocol |
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05-06 |
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"This article will discuss
how to successfully
prepare a thorough system
design and conduct
commissioning tests for
newly installed wind farm
cable systems resulting in
a more reliable
underground cable
collector network." |
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IEEE Electrical Insulation
Magazine |
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09-06 |
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"This article describes
typical cable defects
uncovered while testing
over 9,000 km of medium
voltage XLPE insulated
cables." |
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Wall Street Journal |
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09-06 |
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"decade old underground
cable and other gear prone
to failure under stress." |
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Why test above
operating voltage?
The
factory test is an offline partial discharge
diagnostic test that uses a power frequency voltage
source to replicate operational and transient
conditions. The results can be compared to
acceptable IEEE PD levels.
What does IEEE 400
"Guide for Field Testing and Evaluation of the
Insulation of Shielded Power Cable Systems" -2001
say
concerning
DC HIPOT, VLF Testing
and offline PD
diagnostics?
DC
HIPOT:
Furthermore, from the work of Bach, we know that even massive
insulation defects in extruded dielectric insulation
cannot be detected with dc at the recommended
voltage levels. IEEE
400.4.2 DC Testing
VLF HIPOT: In
withstand testing,
insulation defects are
caused by breakdown
(fault) at the time of the
testing. Faults are
repaired and the
insulation is retested
until it passes the
withstand test. The
withstand test is a
destructive test. IEEE
400.8.1 Introduction to VLF Testing
Offline PD Diagnostics: If the cable
system can be tested in the field to show that its
partial discharge level is comparable with that
obtained in the factory tests on the cable and
accessories, it is the most convincing
evidence that the cable system is in excellent
condition.-IEEE 400.7.4
Offline Partial Discharge
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