A practical magnetic field evaluation method for 10kV air-core reactors

In 110/10kV and 35/10kV substations in China, 10kV air-core reactors are widely used as current-limiting reactors for 10kV compensating capacitor banks. But such reactors produce significant magnetic fields in near areas. They are important power frequency magnetic fields source in substations. Public concerns related to magnetic field exposure necessitate the investigation of power frequency magnetic fields in the vicinity of such reactors. Substation operation experiences also show that interference problems related to such reactors do occur in substation control rooms near the reactors, especially to computer VDUs as often. The importance of predicting reactor magnetic fields at the substation design stage is then apparent.