Features and Benefits
Important Notice:
HVI’s line of Tan Delta Transducers, used as accessories to the VLF-E Series of Very Low Frequency AC testers, has been changed. The TD-34E has been discontinued. The TD-65E, will now be offered as an accessory to either VLF-E model. See Product Change Notice Here.
Tan delta (Tan δ, TD) testing, also called dissipation factor or loss angle, is used for measuring the degree of deterioration of shielded MV/HV cable insulation. The results reveal how contaminated, damaged, or water tree strewn the insulation has become.
TD measurements are used to satisfy the following objectives:
Establish baseline readings on new installations
Monitor cable conditions over time
Compare the condition of many cables to help prioritize replacement and/or cable injection/rejuvenation programs
Determine which additional tests may be warranted
Tan delta testing is performed with the cable off-line. A VLF AC test instrument provides the test voltage to the cable while the TD device records the results. It is a diagnostic test, meaning it is not a VLF AC withstand test where the risk of cable failure is high. With TD testing, cables can be rated as highly, moderately, or slightly degraded. The test voltage is increased slowly in steps while readings are monitored to avoid possible cable failure should the TD numbers indicate severe degradation.
The TD cost is moderate, tests are easy to perform, and the results are easy to interpret.
Specifications
Input:
Two Alkaline “D” cell batteries required – Four supplied
rechargeable “D” cell batteries acceptable – Not included
Metering:
Voltage: 1-65kVp(46kVrms), ±1% Accuracy, 0.1kV Resolution
Current: 0-150mAp(106mArms), ±1% Accuracy, 1uA Resolution
Tan Delta: 0.1Hz -0.01Hz, 5nF-10uF, 1.0 x 10-₄ Accuracy, 1.0 x
10-₅ Resolution
PC Interface:
XBee 802.15.4 (wireless, ~30ft range)
PC Software:
E-Link remote control and report generation software
Interconnect Cables:
88-5061 – 20ft/6.1m VLF output cable for use with V:F-34E
81-552 – 20ft/6.1m VLF output cable for use with VLF-65E
(Sold Separately)
Included Cables:
10ft/3m TD output lead terminated with red banana clip,
20ft/6.1m green/yellow test lead, 2in/51mm x 5in/127mm
toroid, 1 1/2in/38mm aluminium ball with banana socket
Size:
TD Transducer w/ Tripod:
7in/152mm x 8in/203mm x
18in/457mm
TD Carrying Case:
22.5in/572mm x 15in/381mm
x 11.75in/298mm