{'fraction_non_alphanumeric': 0.009146341463414634, 'fraction_numerical': 0.0, 'mean_word_length': 5.378640776699029, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
An Estimation Method of Stray Capacitances in a Transformer for Lightning Surge Analysis

A simple method for estimating stray capacitances in a three-phase Y-Δ transformer is proposed. A conventional transformer model is simplified according to the structure of the primary and secondary windings of the transformer. The induced voltages on the primary windings of the transformer just after applying an impulse voltage to one of the windings are analytically expressed using the stray capacitances of the simplified model. The stray capacitances are estimated from the induced voltage and three measured capacitances with the analytical induction factor.