Внешнее магнитное поле городских трансформаторных подстанций и методы его нормализации

Abstract

Research of external magnetic field of urban transformer substations and the methods it reduction to the standard level in the living quarters of nearby. Experiment based on the actual values the measuring magnetic flux density of the alternating magnetic field. Theories of electromagnetic field on quasistatic formulation is basis of external magnetic field of urban transformer substations description. We have made comprehensive experimental researches the magnetic field of a 50 Hz through model urban transformer substations on the external environment. For calculating the external magnetic field of transformer substations the mathematical model of multidipole is proposed. It practical uses for induction external magnetic field of calculating created in nearby built in house transformer substations power 715 kVA is proposed. Comparison of results calculation and experiment was conducted. We have established that magnetic flux density of the magnetic field does not exceed standard level in the living quarters of nearby (0.5 µT) if quarters the location distances of more than 8 m from the transformer substation on the first time. Transformer substations in the builtin houses can create the dangerous to public health magnetic field which induction 1.5-7 µT in neighboring living quarters. It exceeds the normative level in 3-14 times. We have proposed normalization methods of the external magnetic field builtin transformer substations. Methods are based on improving construction transformer substations. And methods of external passive and active shielding are considered.