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• • • TEST & MEASUREMENT • • •


three-phase switchbox. Available as an optional accessory, this unit allows three-phase transformers to be conveniently tested without the need to reconfigure the test lead connections for each phase. The added benefit is that switching between phases is controlled manually from the test set without the need for additional climbing. Also introduced is the TDX accessory unit,


MEGGER ADDS CONVENIENT THREE-PHASE SUPPORT TO SUBSTATION TEST SYSTEM M


egger has further increased the versatility of its groundbreaking TRAX substation test system by introducing the TSX300


current, short-circuit impedance, tan delta, capacitance, frequency response of stray losses, CT and VT testing, and circuit breaker timing and motion analysis. Despite the wide range of functions offered by


which facilitates the use of TRAX test sets to perform tan delta and capacitance measurements. The TRAX/TDX combination can also be used to measure the excitation current of transformer windings and, with an optional test capacitor, to perform automatic tip-up tests and HV turns-ratio testing. Megger’s TRAX test sets have been specifically


designed to offer a convenient and comprehensive solution for transformer and general substation testing. They are capable of performing more than 20 different test functions, including measurement of winding resistance, turns ratio, excitation


electricalengineeringmagazine.co.uk


these novel instruments, they are exceptionally light and compact. The TRAX220, which has a maximum AC current capability of 200 A, is the lightest test set of its type, weighing just 32 kg in its transport case, which means that it can be transported by air as check-in luggage. All TRAX test sets have an intuitive user


interface that offers full manual control or guided testing using the built-in TRAX apps. Each of these apps implements a specific test function – for example, turns ratio measurement or winding resistance measurement – and automatically configures the instrument for the selected test. All unnecessary information is removed from the display, with only information relevant to the test in hand remaining. This app- based approach makes TRAX test sets easy to work with and eliminates the need for extensive user training.


These innovative test sets can generate and


measure a wide range of currents and voltages 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. Other key features of Megger’s innovative TRAX


test sets 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 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.


MEGGER uk.megger.com/multifunction-transformer-and- substation-test-system-trax


ELECTRICAL ENGINEERING • JULY/AUGUST 2020 25


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