Biblioteca Técnica

Transformer Turns Ratio (TTR) is one of the most common test used to assess the condition of the transformer’s windings and core.  It is performed as a part of acceptance and maintenance test procedure to determine any problems due to poor design, assembly, handling, overloading, fault conditions or poor maintenance. TTR results are compared against the nameplate ratings to determine any possible insulation deterioration, shorted turns, core heating or any other winding or core abnormalities.TTR is a simple and easy test to perform that is often taken for granted without fully understanding the principle and basis of the test. In cases when measurements are not within expected limits, it becomes a challenging task to determine the root cause and resolve the problem. This paper will focus on some of the unknown facts associated with the TTR test. The paper covers in detail the effect of applied test voltage, comparative analysis of step up vs step down excitation, different vector configurations, differences between nameplate ratio, voltage ratio and turns ratio, sources of ratio and phase angle errors, comparison of per phase testing vs true three phase testing, extreme tap ratios being out of tolerance for On Load Tap Changers (OLTC), and TTR test correlation with other electrical tests. The paper also provides field test results and case examples to explain the above-mentioned unknown facts.

Download this installation package to load new MPQ software on your Computer.

Here you will find Firmware to be loaded into the MPQ1000 and MPQ2000 Analysers. The current update file MPQ_Firmware_1295_OLD_OS.zip contains the update, specific instructions for the MPQ1000 and specific instructions for the MPQ2000. Download the zip file and directly unzip it to a Clean Thumb drive.

Completing turns ratio tests on all transformer taps can be a cumbersome process. With One Touch OLTC from the TTRU3, anyone can configure and test all taps within a few short minutes.

Software downloads for E-Tray products including Smart-Thump, EZ-Thump, EZ-Restore Overdrive and T3090.

When performing calibration verification of the TTRU3, the following factors need to be considered to achieve accurate measurements and prevent damage to your calibration fixture or TTRU3.

Not all product demonstrations go as planned. Unforeseen problems can arise, causing the demonstration to go awry. We can either accept this as a failure or use it to create an opportunity. 

MeggerBook Cable & Report Edition

Software download files for PowerDB

High power test and diagnostics combination for medium voltage cables.