The tunable resonating inductor is an essential accessory used in conjunction with Capacitance and Tan-Delta test sets to expand the capacitance range of the test sets .
The tunable resonating inductor is connected in parallel with the internal power supply of the test set and the test object. Tuning the resonating inductor varies the inductance to tune the parallel circuit for minimum resistive load current to be taken from the source, while a majority of inductive current negates the capacitive current requirement of the test object.
The tunable resonating inductor is epoxy molded to avoid effect of atmospheric conditions on the insulation capacity of the coil. The body comprises of a welded steel frame with thick Aluminum panels designed to keep the weight low but withstand the rigors of field operation.
TRI series can also be connected to Hipot HV units, in similar configurations, with necessary changes in a few connections so as to be able to reflect correctly on the current measuring modules and overcurrent protection on the main units.

- For use along with Capacitance & Tan-Delta test sets & Hipot test sets to expand range of measurements for large capacitance objects like Rotating Machines (Generators & Motors) and XLPE HV Cables
- Reduces HV Power Source capacity needs by almost 90%
- Eliminates need for multiple fixed reactors in parallel and need for know-how of approximate capacitance before testing. Provides optimum power balance
- Designed to be compact and light-weight to be transported for field testing
- Dual-spindle gear mechanism with auto-balancers for variation mechanism ensures smooth operation through-out its usable life
- Available in voltage variants of 12kV, 15kV and 30kV
- Available for compensating Capacitances from 0.05uF to 3uF
- Indicator level indicates position of variable arm, and also approximate capacitance
- HV-shielded cables and connectors, for safe operation.
- Large heavy duty rubber lined wheels for noise-less movement thro shopfloor. Locking arrangement also provided.

Capacitance and dissipation factor “power factor” testing is used to determine the quality of electrical insulation. Hipot testing is done at higher than service level voltages to ensure that insulation can withstand service level conditions for a longer period of time without significant deterioration.
The insulation characteristics may degrade during usage due to temperature variations, contamination, moisture ingress, partial discharge or normal aging. Tan-Delta measurements are used to detect these problems before complete insulation breakdown occurs. It is necessary to perform periodic Power Factor checks on insulation of all types of HV/EHV equipment in service, or those which are intended to be put in service.
While the C&DF test sets available in the market can typically cater to the power sourcing requirement (< 3kVA) that will be demanded by certain test objects like Transformers, Bushings, CTs, PTs, etc, there are certain high-capacitance objects like large Motors, Generators, Cables that typically have capacitance levels ranging from 0.05uF to 1uF or some typically long cable runs even having up to 3uF!
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