Effects of Two Emergent Operations from Power Cable on Electromagnetic Interference of Control Cable in Power Plants

The current load in a 10 kV power cable in the nuclear power plant is time-varying, especially multi-lines in the same cable tray. Control cable is sensitive to the variation of power cable load, which is easily results in electromagnetic interference in its conductor. In the present study, a typical situation of cable installment was considered, two specific sudden cases were carried, and the interference current was calculated and analyzed. The results show that unbalance in the load current of the power cable brought a significant increase in interference current, up to five times when the unbalance rate is 10%. Similarly, a sudden power off in the power cable results in a 5 times interference when the current drop rate is 10. Finally, it is found that more attention should be paid to the interference current on the control cable when the unbalance of load in the power cable or sudden power off occurs.