Analysis Of Breakdown Voltage Measurement Uncertainties For Different Standards

Mohd Anuar, Fathin Nuramirah (2019) Analysis Of Breakdown Voltage Measurement Uncertainties For Different Standards. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Transformer oil plays an important role in reducing the temperature of the transformer where it reacts as a cooling agent and insulator to the transformer. For a long time, the oil will degrade thus the transformer will have a potential for faults and costly repairs. Dielectric strength is one of the characteristics of the transformer that is used to measure the maximum voltage that the material can withstand without having a failure. Breakdown voltage test of a transformer is known as dielectric strength test. This test will indicate the quality of the oil transformer. Uncertainty of measurement is the doubt that exist about the results of any measurement. The aim of this project is to measure the breakdown voltage of different transformer oil by using different standards. Next, to measure the uncertainty of the breakdown voltage readings. Lastly, to evaluate the breakdown voltage reading from three different standards based on uncertainty measures. The project focuses on two types of transformer oil which are mineral oil and vegetable oil. Three standards are applied in this project which are IEC 60156, ASTM D877 and ASTM 01816. The initial phase of the project study the standards that are related in this project, the methods on how to calculate the measurement uncertainty and the theoretical about the breakdown voltage. The uncertainties factors in breakdown voltage include voltage rise, resolution, repeatability of data and calibration of the instruments. The more factor of measurement uncertainty included in the data, the higher the accuracy of breakdown voltage. This will give effects in the calculation of measurement uncertainty. These standards are slightly dissimilar in terms of test voltage rise, measurement gaps, and electrode shape. These differences are the source of uncertainties in breakdown strength measurement. This project use Megger OTS60PB as a main apparatus in order to measure the breakdown voltage. Prior to the breakdown voltage measurement, moisture content of the transformer oil must meet the requirement of the standard which are 200ppm for vegetable oil and 35ppm for mineral oil. The results of the breakdown voltage analysed using measurement uncertainty for each standards and transformer oil. The result of measurement uncertainty in the range of 95% as in theoretical readings. The result show the data is within the range of measurement uncertainties in every samples. All of the objectives were achieve based on the calculation in this report.

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