The High Voltage, Inc. TD-34E Tan Delta bridge is designed to work with and communicate wirelessly via the XBee protocol to the VLF-34E to form a complete cable diagnostic system. Together they offer high end features such as wireless communication, data acquisition, and report generation using the supplied E-Link PC software. This system is designed to perform Tan Delta testing, also known as Tan δ, Dissipation Factor or Loss Angle on 5 to 25kV primary cables to the worlds standards; IEEE 400, IEEE 400.2, IEEE 433, DIN VDE 0276, CENELEC HD620 S1, NEETRAC CDFI, & others. Tan Delta testing is a non-destructive diagnostic test performed to measure the degree of deterioration of shielded MV/HV cable insulation. The results reveal how contaminated, damaged, or water tree strewn the insulation has become. Tan Delta testing is performed with the cable off-line where an AC power source, in this case a very low frequency (0.1Hz) hipot, provides the test voltage to the cable while the Tan Delta device records the results. The test voltage is increased in steps while readings are monitored to avoid possible cable failure should the TD numbers indicate severe degradation.
The High Voltage, Inc. VLF-34E is the latest generation of VLF AC hipots using an air-cooled, solid state design with microprocessor control. High end features include user programable test sequences, wireless communications, data retrieval and manual or automatic load based output frequency selection.The supplied E-Link PC software offers wireless remote operation, custom report generation, and test data export to .csv. Wireless communication between the VLF-34E, optional TD-34E Tan Delta Bridge, and/or user supplied PC is achieved via the XBee protocol which offers more reliability than Bluetooth. Introduced in 2010, the VLF-34E is the choice for 5 to 15kV acceptance and 5 to 25kV maintenance testing per IEEE 400.2-2013.