14 papers · ranked by Valyu relevance
Reza Jalilzadeh Hamidi
with Applications in Hardware in-the-Loop Digital Twin Authors: ['Reza Jalilzadeh Hamidi'] Abstract—This paper proposes a recursive method for integrity verification of measured transformer currents, which is suitable for the modular development of Hardware-In-the-Loop Digital Twins (HIL DTs). The Differential…
Carlos A. Platero, José Ángel Sánchez-Fernández, Konstantinos N. Gyftakis, Francisco Blázquez + 1 more
'Konstantinos N. Gyftakis' 'Francisco Blázquez' 'Ricardo Granizo'] Nowadays, non-toroidal shape primary pass-through current transformers are commonly used for large current machines with several cables per phase. As these transformers exhibit no radial symmetry, it is not clear if they can be tested using the indirect…
Saeed Lotfifard
— This paper explains a unified approach for teaching the electrical model of power transformers to undergraduate students using magnetic circuits. The commonly used approach for explaining the electrical model of power transformers is a hybrid approach in which magnetic circuits are used to explain the presence of…
Alen Kuriakose, Kharanshu Solanki, Meblu S. Tom
In this paper, we try to create an effective mathematical model for the well-known slayer exciter transformer circuit. We aim to analyze various aspects of the slayer-exciter circuit, by using physical and computational methods. We use a computer simulation for data collection of various parameters pertaining to the…
Michal Kaczmarek, Blazej Pacholczyk, Emanuele Piuzzi
This paper is devoted to the development of a window-type inductive current transformer (iCT) with a rated primary current equal to 400 A and two secondary windings with rated currents of 5 A and 1 A. Its novelty concerns the presentation of this process in the case of an iCT with a 0.2S accuracy class ensured not only…
Fuchao Li, Zihuan Huang, Yuan Meng, Yifei Zhou + 6 more
The load current of the new power system has significant characteristics on a wide dynamic range, which poses challenges to current sensing technologies. This paper proposes a magnetic-sensitive element based on NdFeB/Lead Zirconate Titanate (PZT) magnetoelectric composite materials, and further develops a…
Pavel Ripka, Karel Draxler, Renata Styblíková, Andreas Hütten
Instrument current transformers (CTs) measure AC currents. The DC component in the measured current can saturate the transformer and cause gross error. We use fluxgate detection and digital feedback compensation of the DC flux to suppress the overall error to 0.15%. This concept can be used not only for high-end CTs…
Yuxuan Chen, Jing Sun, Bo-Qi Meng
The working principle of a electric current transformer is based on electromagnetic induction, mainly composed of a closed iron core and windings. Its primary winding has relatively few turns and is connected in series with the current circuit to be measured. However, due to the frequent occurrence of full current…
Maciej Chojowski, Marcin Baszyński, Robert Sosnowski, Aleksander Dziadecki + 1 more
'Aleksander Dziadecki' 'Alfio Dario Grasso'] High-frequency current transformers (HFCT) are widely used to measure fast transient current. Their advantages are simple structure and relatively moderate price. Their lower and upper bandwidth are limited, but the HFCT can be easily applied to many measuring applications…
Bhaskar Mitra, Ankit Singhal, Soumya Kundu, James Ogle
—The influx of non-linear power electronic loads into the distribution network has the potential to disrupt the existing distribution transformer operations. They were not designed to mediate the excessive heating losses generated from the harmonics. To have a good understanding of current standing challenges, a…
Alessandro Mingotti, Lorenzo Peretto, Lorenzo Bartolomei, Diego Cavaliere + 1 more
'Diego Cavaliere' 'Roberto Tinarelli'] The aim of this work is to assess whether actual distorted conditions of the network are really affecting the accuracy of inductive current transformers. The study started from the need to evaluate the accuracy performance of inductive current transformers in off-nominal…
Saad F. Al-Gahtani, Z. M. S. Elbarbary, Shaik Mohammad Irshad, Lalit Chandra Saikia
'Lalit Chandra Saikia'] Power transformers are the most important component in power system. Exposing these transformers to the harmonic distortions causes additional heat losses, insulation stress, decrease in lifetime of insulation, and reduced power factor with decrease in efficiency of the system. The lifespan of…
Y. Xiang, L. Wu, K. Velitsikakis, A. L. J. Janssen
This paper investigates the transient phenomena that occur in two special cases in the Netherlands: (A) during the energization of a power transformer via a cable feeder and (B) the energization of a power transformer together with an overhead line (OHL). In Case A a 7 km long 150 kV cable and a 150/50 kV transformer…
Authors not listed
When a small electric bias is applied to a single-molecule junction, current will flow through the molecule via a tunneling mechanism. In molecules with a cyclic or helical structure there may be circular currents, giving rise to a uni-directional magnetic field. Here, we implement the Biot Savart law and calculate the…