The solution for testing transformers and other substation components

Matz Ohlen - Director of transformer testing

In response to the growing demand for compact substation test systems that are capable of performing a wide range of tests, Megger has developed the new TRAX Transformer and Substation Test System, with three variants and a multitude of apps available to suit different requirements.

Combining versatility with ease of handling, the TRAX220 is the lightest test system of its type – it weighs just 32 kg in its transport case – and can even be transported by air as check-in luggage. Despite the compact construction, TRAX delivers a no-compromise performance and provides results that are just as or more accurate and dependable as those obtained from separate instruments.

Optimised for transformer and general substation testing, TRAX is capable of performing numerous test functions including, for example, measurement of winding resistance including demagnetization of the transformer core, tap-changer continuity and timing, turns ratio, excitation current, short-circuit impedance, tan delta, capacitance, CT and VT testing, as well as circuit breaker timing and motion analysis.

The test system permits a wide range of currents and voltages to be generated and measured with high precision. The TRAX220 has a maximum AC current output capability of 200 A, while the TRAX280 extends this to 800 A. For both units this can be further extended to 2000 A with an optional current booster.

Users have a choice of full manual control for specific measurements, or guided testing using the built-in TRAX “apps” for standard testing. Each app implements a specific test function – for example, turns ratio measurement or winding resistance measurement – and automatically configures the instrument for this test. All surplus information is then removed from the display with only information relevant to the test at hand visible. This app-based approach makes the TRAX test system uniquely easy and intuitive to work with, and eliminates the need for extensive user training.

Other key features of Megger’s new and innovative TRAX test system include state-of-the-art transformer winding resistance measurements with test currents up to 100 A true DC at up to 50 V compliance voltage; dynamic (DRM) on-load tap changer (OLTC) measurements; exceptional interference suppression to secure accurate readings even in high noise switchyards; a wide operating frequency range of 5 to 500 Hz (1 to 500 Hz for tan delta measurements); individual temperature correction of tan delta measurements using Megger’s patented technology; and automatic voltage dependence detection, which is another unique feature covered by Megger patents.

To ensure maximum operator safety, TRAX incorporates ground-loop detection, dual interlocks and facilities for fast discharge of inductive measurement objects. Provision is also made for connecting an optional strobe warning light.

TRAX Transformer and Substation Test System currently include three variants. The TRAX220, with 200 A AC output capability and the TRAX280, with 800 A AC output capability have integral colour touch screens for the user interface and to display test results. The TRAX219 has capabilities similar to those of the TRAX220, but has no touchscreen and is designed to work in conjunction with an external computer.

Optional accessories available for use with TRAX include the TDX120 unit for tan delta and capacitance measurements, the TSX300 unit for three-phase measurements on transformers, and the TCX200 unit for high-current testing up to 2000 A.

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