Available Modes
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Mode Select switch set to
Arc Reflection
Arc reflection test or Time Domain Reflectometry (TDR).
Note: Requires cable analyzer.
Mode Select switch set to Surge
Surge tracing, pinpointing, or surge pulse method.
Note: Surge pulse method requires cable analyzer.
Mode Select switch to Proof/Burn
DC burn or DC proof test.
Mode Select switch to Ground
Positive discharge of internal capacitor and the cable under
test. |
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Description
The DARTŪ Cable Analysis System
works in conjunction with any of the Biddle Power Fault Locating
(PFL) Systems, and is perfect for those utilities tasked with
regularly maintaining URDs.
This system will locate
bolted faults (shorts), blow-outs (opens), splices and high
impedance faults on medium voltage distribution cable. To improve
ease of use, the DART itself incorporates a WindowsŪ based
operating system plus other simplified control functions which
were developed in collaboration with utility service crews.
Applications
A Power Fault Locating System is
used to locate high impedance cable faults using arc reflection,
differential arc reflection and surge pulse reflection. During an
arc reflection test, the analyzer acquires and captures a Time
Domain Reflectometry (TDR) image of the cable under surge
condition. This image is then displayed along with the TDR image
of the cable without the surge condition.
Using differential arc
reflection, a patented algorithm eliminates unwanted and confusing
reflections leaving only the location of the fault. The surge
pulse reflection method is available when an arc cannot be
sustained at the fault during a surge using the arc reflection
method.
The value of the DART is
improved fault locating efficiency and reduced cable stress
incurred during the fault locating process. This is accomplished
through the ability to determine approximate distance to a
failure. Pre-location of the failure eliminates the tedious
process of surging or thumping a cable while crews walk the line
in search of the failure point.
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