Online calculating method of switchgear circuit resistance for 3/2 wiring connection substation based on optimal planning model

Aiming at the online calculation problem of the switchgear circuit resistance in 3/2 wiring connection substation and phase difference of the current through each switch, this paper proposed a kind of online calculation method based on optimal planning model. The optimal planning model is established on basis of the current through the switch and the circuit resistance, therefore the complex calculation problem of switch resistance is transformed into solving optimal planning model. Using genetic algorithm can avoid the complexity which brought by the conventional method to solve the problem of multidimensional space planning during the process of calculation. In the end, it proved the effectiveness of the proposed method through carrying out simulated operation based on the data from 500 kV substation using 3/2 wiring connection mode. Compared with the equation model, the optimal planning model is more accurate and the calculated result is closer to the actual value.