Split-winding transformer is a one of the common types with low-voltage winding placed above other and jointly high-voltage regulation winding. The paper investigates circulating currents that occur in windings case nonsymmetric load. In addition, measurement for 240MVA, 220 kV presented along numerical calculation compared measurement.

A MneZn ferrite magnetic fluid (TCF-56) having 5.6 mT fluid magnetization and high pyromagnetic coefficient, (vM/vT 1⁄4 177 A/m K) has been investigated as a coolant in a 3 kW prototype transformer for overloading condition (167%). The winding temperature of a transformer submerged in magnetic fluid reaches at 396.8 K after 3 h of overloading, which is 20 K lower, when the same experiment was c...

An efficient transformer model is required to characterize the transformer internal faults for its condition assessment, which is experimentally very costly. This paper discusses the application of Neural Network (NN) techniques in the modeling of a distribution transformer with internal short-circuit winding faults. A transformer model can be viewed as a functional approximator constructing an...

Power transformers use Kraft paper as insulation in the electrical windings present in the core, which is immersed in oil. In service, the temperature of the windings of core will go to 75C to 85C. If the transformer is over loaded, then the temperature can exceed upto 100°C causing the cellulose chains in the paper to cleave at an accelerated rate, which results in the degradation of mechanica...

Generation, transmission and distribution of electric energy are to be characterized by a very high degree of reliability. Reliability level is directly related to the quality of the equipment used and the periodic maintenance carried out on the system. In our country, the distribution system is the most neglected part, which is being given some importance only in the recent years. Distribution...

This paper presents a construction of a controllable reactor of transformer type (CRT) with multifold magnetic materials, and the construction based on the magnetic-integration techniques is used to weaken the magnetic coupling effect among control windings and eliminate requirement of series current limiting reactance. At last, based on the proposed equivalent circuit of integrated magnetic st...

By the analysis of transfer function mechanical deformations or displacements of transformer windings can be detected. For on site measurements on large power transformers essential attention has to be put on accurate cabling and handling of grounding conductors. Of further concern is the selection of a meaningful upper frequency limit, from where beyond measurements of frequency responses are ...

The paper presents comparative analysis of three versions the modified scheme space-vector-based synchronous pulsewidth modulation (PWM), applied for control two-level inverters transformer-based photovoltaic (PV) system, and focused on providing symmetry winding voltage power transformer during whole adjustment range. Power supply is by corresponding solar strings consisting a set PV panels, o...

We have developed a 1:30000 winding ratio cryogenic current comparator (CCC) for measurement of small currents, e.g., generated by a single electron transport device. A dedicated low-noise SQUID is used for the readout, which allows reaching a sensitivity close to ideal, that is without loss of sensitivity in the flux transformer coupling the CCC and the SQUID. The CCC-SQUID equivalent current ...