T&D World Magazine

Megger Automates High-Voltage Insulation Diagnostics

Featuring rugged yet lightweight construction and designed to work reliably in high-interference areas like substation switchyards, Megger’s new DELTA4000 series 12-kV insulation diagnostic system offers time saving fully automatic power factor/tan delta and tip-up testing. Also provided are facilities for manual measurements where the operator has full control to set the test parameters – to cater for special testing requirements.

Accurate and dependable intelligent temperature correction, based on the actual condition of the test object, can be applied to results using a novel and patented technique, which works with data acquired from a separate dielectric frequency response (DFR) test. Automatic voltage dependence detection, which suggests the need for further (tip-up) testing and which is often a useful indicator of incipient insulation problems, is also provided. Both are patent-pending technologies.

Despite their small size and low weight, Megger’s DELTA4000 series test sets offer comprehensive facilities for assessing the condition of electrical insulation in all types of high-voltage equipment, including transformers, bushings, circuit breakers, cables, lightning arrestors and rotating machinery. They can also be used for measuring the excitation current of transformer windings.

To ensure that accurate results are obtained even when the instrument is powered from a supply with poor voltage and frequency stability, the test sets generate their own test voltage, which is independent of supply quality. A further benefit of this approach is that it allows the test voltage to be varied in frequency from 1 Hz to 500 Hz, making the instruments even more versatile.

DELTA4000 series measure quantities include voltage, current, power loss, tan delta, power factor and capacitance. Test results are automatically stored in the unit and can sent directly to a printer via USB.

To further increase their usefulness and convenience, DELTA4000 series instruments are supplied with Megger’s versatile PowerDB Lite software. This allows the operator to run standard automatic tests and to program specific customised test routines in advance.

The DELTA4000 series has been developed after careful analysis of user requirements in relation to high voltage insulation testing. This innovative new test set is a significant step forward in high-voltage insulation testing technology and will be available in two versions; the DELTA4110, to be used with external computer and the DELTA4310, a stand-alone model with on-board computer.

TAGS: Substations
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