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This document describes the determination of the saturated inductance of a transformer, which is the slope of the saturation curve Phi(I) under highly saturated conditions. This parameter, which has a strong impact on the overvoltages when energizing a transformer, has been determined from analytic formulae for a shell-type transformer. Comparisons with the values derived from an electromagnetic 3D...
In the paper new sensitive algorithms for detection of internal inter-turn faults in power transformers are described. Such faults are extremely difficult to detect since they induce negligible increase of the currents at the transformer terminals, although the currents flowing at the fault place are very high and dangerous for the transformer. The algorithms developed are based on the differential...
This paper deals with halogen luminaries, ones of the main used lighting sources in residential area. The use of these artificial light sources leads towards different operational constraints in the low voltage power systems, such as inrush currents, harmonics or high frequency perturbations. Hence, the aim of the work is the characterization and modeling of halogen luminaries in ATP-EMTP, in order...
In this paper, a combined power-current spectrum blocking for current differential protection of power transformer is proposed. The proposed algorithm can exclusively classify the internal faults associated with transformer inrush currents. This combination is assessed based on the individual analysis of differential power and power spectrum releasing functions and second harmonic current blocking...
This paper deals with damping modeling for transformer energization studies for system restoration purposes. A review of some of the literature recommendations for these studies is presented. Then, several damping models for generators, lines and transformers are benchmarked by means of simulation vs. field test measurements comparison. For the field test case considered, results show that simple...
The paper deals with the temporary overvoltages that build up in radial MV distribution networks following the inception of a 1-phase-to-ground fault (1-Phi -to-Gr). For extended cable/overhead MV distribution networks with ungrounded neutral, in case of low resistance faults at critical stretch of overhead lines, in [1] it has been evidenced that the temporary overvoltages on healthy phases can be...
This paper presents a new algorithm for protection of power transformer by using optimal radial basis function neural network (ORBFNN). ORBFNN based technique is applied by amalgamating the conventional differential protection scheme of power transformer and internal faults are precisely discriminated from inrush condition. The proposed method neither depend on any threshold nor the presence of harmonic...
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