The objective of this paper is to present a simple sensor based on Faraday’s Law together with an integration and amplifying stage and used for measuring fast current pulses. Its behavior in time and frequency is tested by measuring Partial Discharges (PD) in electric insulation systems following the guidelines given in the standard IEC 60270. The measurements are also taken with two other sens...

Implementation of the smart transformer concept is critical for deployment IIoT-based grids. Top manufacturers power electrics develop and adopt online monitoring systems. Such systems become part high-voltage grid unit transformers. However, furnace transformers are a broad category that this change does not affect yet. At same time, adoption diagnostic relevant because they heavy-duty applica...

The subject matter of this paper refers to the assessment of the influence of the oil layer thickness on suppression of the acoustic emission (AE) signals generated by partial discharges (PDs) developing in paper-oil insulation of power appliances. The paper presents laboratory research results referring to the analysis of suppression of the AE signals frequency band depending on the thickness ...

Preventative diagnosis and maintenance of transformers has become more popular in recent times in order to improve the reliability of electric power systems. A number of transformers have recently been tested using Return Voltage (RV) and Dielectric Dissipation Factor (tanδ) measurements in the time and frequency domain, respectively. This paper outlines a circuit model which describes the diel...

The computation program of the transient recovery voltages that appears across the terminals of a circuit breaker, after the low inductive current has been interrupted at the disconnecting no load high voltage transformers, using the routines set developed in Matlab is presented. The computation algorithm is based on the peculiarities of operation of the transformer. The computation program has...

power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. frequency response analysis (fra) is a new, well-known and powerful diagnost...