In view of such actual operation as frequent winding inter-turn short circuit of dry-type air-core series reactor

the the effect of electromagnetic characteristics of shunt capacitor on series reactor in reactive power compensation circuit is considered in this paper for the first time

and a two-dimensional axial symmetrical model based on the magnetic field-circuit coupling principle is set up so to analyze the quantitative relationship between the electromagnetic characteristics and fault characteristics of the reactor. Firstly

the analytical calculation principle of the inductance

current and magnetic field of the reactor are described. The two-dimensional axial symmetrical analysis model based on the electromagnetic coupling principle is set up. Given the complexity of electromagnetic coupling multi-physics field analysis and calculation

the finite element analysis software Comsol is used in this paper to verify the accuracy of the two-dimensional axial symmetrical model which is set up under normal operating conditions of the reactor. Then

the electromagnetic characteristics of the reactor under the inter-turn short circuit condition at different positions of winding are analyzed further. The rationality of the established two-dimensional axial symmetrical model is verified by simulation

comparison and analysis

showing that

in case of inter-turn short circuit fault of reactor winding

the current flowing through the short-circuit loop is extremely large with such distribution characteristic as gradual increase from the inner layer to the outer layer and from the end to the middle

but the variation of total current of the circuit is less. Moreover

the magnetic field distortion

in case of fault in the middle position of the winding

is the most serious.