T&D World Magazine

Test Measures Condition of Cable Systems Insulation

High Voltage, Inc. has introduced a new Tan Delta bridge, which is a non-destructive diagnostic test performed to measure the condition, or level of deterioration, of a cable system's insulation. A population of cables is tested and graded. A comparative analysis is then made to predict relative life expectancy and to help prioritize cable replacement, rejuvenation/injection, or to determine what further tests may be useful, such as a VLF HV Withstand, or VLF Partial Discharge test.

Tan Delta testing is a proven, common method of evaluating the dielectric integrity of insulation. It is an off-line test using a 0.1 Hz VLF AC voltage source. It is a qualitative test long established and defined by the IEEE and other similar organizations. It is easily performed, relatively economical, and provides useful results the operator can interpret and act on.

The TD-34E, along with the HVI VLF-34E VLF AC hipot, is the latest in design using current electronic technology. Together they permit the user to perform all VLF and VLF-TD tests possibleand offer the best wireless operation and data collection, aided by the HVI custom application software written solely for the two devices.

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