The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The effects of harmonic contamination on distribution transformer losses and temperature rise have become an increasing concern. This problem is caused by the widespread presence of non-linear loads and their ever-increasing proportion in the power system networks. The paper focuses on the particular effect of voltage harmonics on oil-filled distribution transformers losses. Laboratory experiments...
The effect of harmonic contamination on distribution transformer losses has become an increasing concern over the last decade. This problem is caused by the widespread presence of non-linear loads and their ever-increasing proportion in the power system networks. In this paper, an oil-filled distribution transformer was employed to run short circuit test and open circuit test. The electrical parameters...
Frequency Response Analysis (FRA) is regarded as a robust technique to recognize transformer winding deformation. It has been implemented and used since the last decade. However, its interpretation and measurement sensitivity are still under development. Recent studies reveal that apart from winding deformation, FRA data can also be influenced by moisture variation in transformer paper insulation...
Frequency Response Analysis (FRA) has been in use as a diagnostic method for transformers since the last decade and is emerging as a popular technique. However, accurate interpretation of FRA measurements is still under development. Recent studies reveal that apart from winding deformation, FRA data can also be influenced by moisture variation in transformer paper insulation. A better understating...
Frequency Response Analysis (FRA) has been in use since the last decade as a sensitive method in transformer internal defect recognition. This study has concentrated on the influence of transformer winding dry-out process on FRA spectrum. A single phase glassy model transformer involving concentric LV and HV windings is fabricated and taken as a test object. FRA traces for HV and LV windings of the...
Frequency Response Analysis (FRA) has been operated since last decade as a sensitive method in transformer internal defect recognition. This study has concentrated on influence of temperature variation of the transformer winding on FRA trace. An oil-free single phase model transformer involving concentric LV and HV windings is taken as a test object. The test object temperature is changed widely from...
The application of the ultra-high frequency (UHF) partial discharge (PD) detection method has proven effective in GIS. This method is now also being applied to detect PDs in oil-filled power transformers. In this paper, the localization of the PD source in transformer is discussed. This is achieved by applying an array of four sensors to capture the PD signals at the same time. To determine the PD...
The drive to improve energy efficiency and reduce electrical loading has resulted in energy efficient lighting such as compact fluorescent lamps (CFLs) replacing conventional incandescent lamps. However, the presence of such non-linear loads has brought about the injection of voltage and current harmonics into electrical networks. As transformers are the interface between the supply and the non-linear...
Results of PD tests in vegetable oil impregnated insulating system are discussed in this paper. The main objective of the study is to investigate the PD behaviour in the particular insulating systems at elevated temperature. Two different sample arrangements of electrical pressboard and insulating paper were used to simulate insulation defects. The sample was placed in a glass cell and was fully immersed...
This research, the common condition monitoring technique, Partial Discharge (PD) detection was applied to laboratory test configurations that simulate soy seed based oil-filled transformer insulation system. The soy seed-based oil insulation system was found to have significantly different test results when compared to the mineral oil insulation system. Discharge activities in soy seed based oil insulation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.