Rj. Gavazza et Cm. Wiggins, REDUCTION OF INTERFERENCE ON SUBSTATION LOW-VOLTAGE WIRING, IEEE transactions on power delivery, 11(3), 1996, pp. 1317-1329
This paper describes test results and mitigation methods of electromag
netic interference (EMI) on control and low voltage circuits in substa
tions caused by air disconnect switch operation. The tests are focused
on a comparison between unshielded and shielded circuits from capacit
ively coupled voltage transformers (CCVT) and other equipment circuits
in the vicinity. New test data are presented comparing unshielded and
shielded cables and transient currents on all connections to the CCVT
including the pedestal and ground strap. The paper gives a practical
and understandable explanation of the causes of EMI in substations and
how shielded cable and parallel ground conductors reduce interference
. Design guidelines are listed in the Conclusion.