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Megger automates high-voltage insulation diagnostics
Story
Featuring tough yet lightweight construction and designed to work reliably in high-interference areas like substation switchyards, Megger’s new DELTA4000 series insulation diagnostic test sets offer time saving fully automatic power factor/tan delta measurement and tip-up testing. Also provided are facilities for full manual control – including the ability to vary the applied voltage up to 12 kV during testing – to cater for special testing requirements.
- Automatic and manual operation
- Accurate and repeatable measurement results with high noise suppression
- Lightweight, rugged two-piece design
- Built-in intelligent temperature correction
- Automatic voltage dependence detection
Intelligent temperature correction
Accurate and dependable 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 dynamic frequency response (DFR) test. Automatic detection of non-linear response, which suggests the need for further (tip-up) testing and which is often a useful indicator of incipient insulation problems, is also provided.
Versatile
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.
Designed for the user
DELTA4000 series instruments show test results on a large bright built-in colour display. Measured quantities include voltage, current, power loss, tan delta, power factor and capacitance. Test results are automatically stored in the unit and can be downloaded directly to a PC or to a USB memory stick. The results can also be sent directly to a printer via the instrument’s USB port, without the need to use a separate computer.
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.
