pimiПриборы и методы измеренийDevices and Methods of Measurements2220-95062414-0473BNTU10.21122/2220-9506-2020-11-3-187-195pimi-662Research ArticleСредства измеренийMeasuring instrumentsУстановка, методика и результаты измерений электрических параметров композита электротехнический картон-трансформаторное маслоMeasurement Stand, Method and Results of Composite Electrotechnical Pressboard-Mineral Oil Electrical MeasurementsРогальскиП.RogalskiP.

Адрес для переписки: P. Rogalski – Lublin University of Technology, Nadbystrzycka str., 38A, Lublin 20-618, Poland e-mail: p.rogalski@pollub.pl

Address for correspondence: P. Rogalski – Lublin University of Technology, Nadbystrzycka str., 38A, Lublin 20-618, Poland e-mail: p.rogalski@pollub.pl

p.rogalski@pollub.plЛюблинский технический университетПольшаLublin University of TechnologyPoland202022092020113187195Copyright © Рогальски П., 20202020Рогальски П.Rogalski P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://pimi.bntu.by/jour/article/view/662

В работе представлена разработанная и изготовленная установка для исследования одной из главных составляющих изоляции энергетических трансформаторов – электротехнического картона, пропитанного трансформаторным маслом.

В состав установки входит специально разработанная климатическая камера с высокой точностью измерения, стабилизации и поддержания в течение длительного времени температуры. Точность поддержания и измерения температуры в течение нескольких десятков часов измерений не превосходит

± 0,01 °C. Электрические измерения на постоянном токе выполнены с использованием метода токов поляризации и деполяризации (англ. Polarization Depolarization Current, сокр. PDC ), а на переменном токе – методом импедансной спектроскопии (англ. Fquency Domain Spectroscopy, сокр. FDS ). Управление работой установки и процессом измерений осуществляется с помощью разработанной компьютерной программы, которая позволяет дистанционно проводить измерения, изменять вид измерений, величины напряжения и температуры, а также регистрировать результаты измерений.

Разработан и изготовлен измерительный конденсатор нового типа, конструкция которого значительно уменьшает вероятность загрязнения образцов в процессе измерений. Благодаря увеличению точности стабилизации и поддержания температуры во время измерений уменьшен шаг изменения температуры при измерениях методами FDS и PDC. Это позволило увеличить точность определения энергии активации измеряемых параметров.

Представлена также основная информация по анализу результатов измерений на постоянном и переменном токе композита – электротехнический картон, пропитанный трансформаторным маслом, содержащим нанокапли воды. В качестве примера представлены результаты нескольких измерений основных параметров электротехнического картона, пропитанного трансформаторным маслом, содержащим нанокапли воды в концентрации (5,2 ± 0,1) % вес., полученные на установке.

The paper presents a measuring stand designed and built for testing direct and alternating current properties of power transformers basic insulation component i.e. electrotechnical pressboard impregnated with transformer oil. Measurements of direct and alternating current parameters are performed using the frequency domain spectroscopy and polarization depolarization current methods.

The measuring station includes a specially developed climatic chamber which is characterized by high accuracy of temperature stabilization and maintenance during several dozen hours of measurements. The uncertainty of temperature maintaining during several dozen hours of measurements does not exceed ± 0.01 °C. The computer software developed to control the station allows for remote measurements, changes in supply voltage and temperature settings and acquisition of the obtained results. A new type of measuring capacitor was developed and manufactured, the structure of which significantly reduces the chance of samples contamination during measurements. By increasing the accuracy of temperature stabilization during measurements, the resolution of measurement temperatures was increased, at which it is possible to perform measurements with the frequency domain spectroscopy and polarization depolarization current methods. This allowed to reduce the step of measurement temperature change and thus to increase the accuracy of determining the activation energy of the measured parameters.

The article also contains basic information on the analysis of the direct and alternating current electrical parameters of the composite electrotechnical pressboard-mineral oil-water nanoparticles. The results of several direct and alternating current parameters measurements of a transformer oil impregnated pressboard sample with a moisture content of (5.2 ± 0.1) % by weight obtained by the use of a measuring stand are presented as examples.

 

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The authors declare that there are no conflicts of interest present.