Characteristics of three types of Pi-cection-artificial lines (the purely capacitive inductive line
the line with homogeneous resistance and red the line
with the resitance in the first branch only) are analyzed and compa-with requirements specified by IEC standard for TRV of SLF line-side and ITRV of the sourse-side of SLF or BTF.Pi-section lines with damping increase the slope of TRV and ITRV
reduce the peak factor and improve the equivalence of artificial lines to the actual line.At the same time
the number of Pi-sections of artificial lines is only the half of that in the lines adopted in the most of other high power laboratories.