Growing Pains

Nick Parton, Megger.

Product Focus
The Megger Delta4000 insulation diagnostic system

The new Delta4000 insulation diagnostic system will perform all the usual tests that the user will expect from a 12kV Tan Delta test set, writes Nick Parton, sales manager at Megger.

This includes the power factor, dissipation factor, capacitance, excitation current, leakage reactance and turns ratio to provide an electrical insulation condition assessment in high voltage apparatus such as transformers, or circuit breakers.

It operates over a wide sweep frequency range, and comes in a very lightweight 2-piece construction to maximise portability.

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The unit introduces two (pat pending) features that are new to this type of instrument. Firstly, the ability to automatically detect if the insulation is showing non-linear properties and advise the operator that a ‘tip-up’ test should be performed to further investigate the problem.

Secondly, the ability to perform temperature correction specific to the object being tested. It has long been established that the standard temperature correction curves used to standardise measurements for comparison purposes are severely limited.

As well as using the standard correction curves, the Delta4000 gives the option of using ‘individual temperature correction’. By measuring the dissipation factor over a wide sweep frequency and using built-in mathematical formulas and models of insulation characteristics, the correct temperature correction can be determined.