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This paper presents the analysis and modeling of the non-minimum phase effects that can occur in the low-frequency response of transformers. This effect is highlighted when the phase response has angles outside the range –90° to +90° and the typical response shape, which consists of two resonance points for the lateral phases and one for the central phase, is not found. Analysis based on physical...
In this paper, a high frequency characteristic of a 6.6 kV transformer winding with a continuous disc type high voltage (HV) winding which consists of 13 turn and 22 discs is modeled. The formulation of the distributed parameters particularly the capacitances are determined according to the geometry and construction of the HV winding of the transformer. The determination of turn-to-turn and coil-to-coil...
Catastrophic equipment failures continue to occur today due to ferroresonance. Ferroresonance is a nonlinear oscillatory phenomenon that occurs in capacitively coupled transformers or reactors under certain conditions. In this paper a harmonic balance method is used to determine periodic solution to the nonlinear ODE with comparative numerical and experimental results.
This paper presents the HF models of multi-winding transformer used in switching power supplies for radar applications. It allows the adaptation of voltage levels for needs and provides galvanic isolation between input and output. Two models of the HF transformer are presented: a simplified model and a model taking into account the coupling of leakage inductors. The accuracy of each model is established...
In this paper an algorithm for PD localization based on using multi-conductor transmission line model is introduced. In this algorithm sectional winding transfer functions are computed using the winding model. To calculate the parameters of the model including resistances, inductances and capacitances between different turns of the winding, it is necessary to have design data of the transformer. Since...
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