Three-phase transformer turns ratio tester

13 March 2002 Test & Measurement

Avo's Biddle Three-Phase Automatic TTR is designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. At 7,5 kg, it is light and its rugged and robust design makes this TTR well suited for use in a variety of harsh environments.

This new TTR is claimed to measure the highest turns ratio range in the industry (10 000:1) and also provide the highest accuracy (0,1%). Another feature is its ability to measure phase deviation (in minutes or centiradians) of the transformer primary versus secondary. This will quickly indicate problems in a transformer such as partial shorted turns and core faults. This measurement is also useful in verifying phase errors of all types or PTs and CTs. The TTR also has special software and onboard memory.

AVO's Biddle TTR is a useful instrument for testing transformer windings, because it can locate several types of problems within a transformer. It is also ideal for testing in meter shops for the upcoming inspection of CTs and PTs and also determines the need to further test faulty CTs and PTs.

For further information contact Kevin Preston, Spescom MeasureGraph, 011 266 1500.

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