Improvement of diagnostic methods for both power and distribution transformers is crucial considering the part they play in electrical networks as well as their cost. Transfer function based testing of transformers is one of the methods that has been introduced recently. This method enables the identification of winding deformations resulting from the short circuit currents and winding dislocat...

Transformers are the basic and valuable equipment of electricity network. Transformers correct function has important role in reliability of network .distribution transformers are designed for work at nominal frequency and full sinus current. Application of nonlinear loads in recent decades, such as power electronic loads, caused higher levels of harmonic. This kind of load can lead to creating...

Kerr electro-optic technique has been used to measure the electric field distribution in high voltage stressed dielectric liquids, where the difference between refractive indices for light polarized parallel and perpendicular to the local electric field is a function of the electric field intensity. For transformer oil, the most widely-used insulating liquids in power apparatus and high voltage...

- At the substation there are equipment that is intended as a transmission regulator, one of which current transformer. "Current transformer (CT) device used to convert high value into lower for measurement and protection purposes, also isolate secondary circuit from primary circuit." The research was conducted by comparing results insulation resistance test with VDE Catalouge 228/4 resistance....

The high frequency transformer in single-phase full-bridge DC-DC converter is prone to saturation because of the asymmetry circuit parameters. Transformer will increase power consumption, accelerate aging winding insulation, and even damage switches. In order prevent this risk, a DC bias suppression strategy presented article, main advantage that problem can be completely eliminated. firstly, m...

This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage frequency transformers modern power electronics. To verify this model, simulation is performed on a 1.5 kV/1 kHz transformer, revealing overshoot between turns and layers of transformer’s HV winding. Effects rise time input pulse voltage, stray capacitance winding insulatio...