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Ferroresonant oscillations in a transformer terminated line due to an energised parallel line on the same right-of-way

2005; Institution of Engineering and Technology; Volume: 152; Issue: 4 Linguagem: Inglês

10.1049/ip-gtd

1359-7051

R. Saravanaselvan, R. Ramanujam, Kassim A. Al-Anbarri, Suru Naresh,

Magnetic properties of thin films

Investigations carried out on ferroresonant oscillations in a transformer-terminated line due to an energised parallel line on the same right-of-way are reported. A nonlinear approach is used for analysis. The magnetic saturation characteristic of the individual phases of the three-phase transformer is represented and modelled by a polynomial. A topological technique is used to formulate the state space model to eliminate redundancy. Time domain simulations have been carried out using fourth-order Runge-Kutta method after corroboration with Microtran. The bifurcation diagram of the steady-state solutions is used to unearth the possible modes of ferroresonant oscillations and multiple solutions. The results reveal that with high saturation levels, chaotic ferroresonant oscillations are a distinct possibility due to the capacitive coupling between the parallel lines. Furthermore, the route to chaos is through a sequence of quasiperiodic oscillations. The sensitivities of the solutions with respect to the length of the de-energised line and the proximity between the parallel lines are analysed and discussed.