studyofeffectsofstandardandnon-standardimpulsewavesonpowertransformer-外文文獻(xiàn)-wenkub.com
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【正文】 February 2020. [2] Bhuyan Kaveri, Chatterjee Saibal, Surge Modelling of Transformer Using MATLABSimulink, Annual IEEE India Conference, INDICON 2020, DAIICT, Gandhinagar, Gujarat, December, 2020. [3] . Roy, . Biswas, Studies on impulse behaviour of a transformer winding with simulated faults by analogue”, IEE . Transm. Distrib., Vol. 141. N . September, I994. [4] S. Venkatesan and S. Usa, Impulse Strength of Transformer Insulation with Nonstandard Waveshapes, IEEE transactions on power delivery, Vol. 22, No. 4, October 2020. [5] Chatterjee S., “Analog studies on Impulse performance of a . Transformer winding with tapping coils”, . Thesis (Jadavpur University) 1994. [6] Shigemitsu Okabe, Evaluation of Breakdown Characteristics of Oilimmersed Transformers under Nonstandard Lightning Impulse WaveformsDefinition of Nonstandard Lightning Impulse Waveforms and Insulation Characteristics for Waveforms Including Pulses , IEEE Transactions on Dielectrics and Electrical Insulation Vol. 14, No. 1。s 1 and 88 and 53 Pulsed wave 1 and 88 Impulse with damping oscillations 1 and 88 I Impulse with damping oscillations II 1 and 88 A parative study has been done on the response of the coils to applied full voltage, chopped impulses at 3 181。s, pulsed wave and two impulse waveforms varying in time to chop with damping oscillations for 10% tapping. A B C Fig. 4 Variation of maximum voltage across the coils and their time of occurrence along the windings for 10% tapping. TABLE IV: Maximum potential across the coils and time of occurrence along the coils with 10% tapping Type of Impulse Coil No. Max. Pot across the coils Time of occurrence (181。s 13 8 Impulse chopped at 15 181。s and 15 181。s, 8 181。s) Full Wave 1115 13 Impulse chopped at 3 181。s, pulsed wave and two impulse waveforms varying in time to chop with damping oscillations for 10% tapping. A parative study has also been done on the response of the coils to applied full voltage, chopped impulses at 3 181。s 3040 25 Impulse chopped at 15 181。s and 15 181。s, 8 181。2020 IEEE switching. Hence, it is necessary to estimate the dielectric strength of the insulation under these nonstandard impulse waveshapes [4]. More than 50% of the failures in power transformers are due to insulation failure in windings [4]. To design the insulation it is necessary to know the voltage appearing across the insulation (as a function of time) and the strength of insulation against the particular voltage wave [2]. A SIMULINK model is constructed on the basis of the design data of a practical 3 MVA, 33/11 kV three phase transformer [2]. The main winding constitutes of 80 coils and 8 extra coils are used as tap coils [5]. The study of the behavior of the transformer winding with one grounded end is done when stressed by standard impulse voltage wave (), chopped impulse waves chopped at 3 181。s, 8 181。s and 15 181。s, pulsed wave and two impulse waveforms varying in time to chop with damping osc
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