# surge impedance

## surge impedance

[′sərj im‚pēd·əns]
(communications)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a single wave propagating along the line: that is, a wave traveling in one direction in the absence of reflections in the other direction.
where [C.sub.f]--substation phase capacitance; [Z.sub.BE]--transmission lines, connected to the substation equivalent surge impedance.
The network consists of substation with capacitance C = 1nF and three transmission lines with phase-phase channel surge impedance [Z.sub.B] = 343[OMEGA].
In proposed tower model, three vertical parallel conductors connected to grounding resistances of 10 [OMEGA] at their bottom and to surge impedance of 1500 [OMEGA] at their tops have been considered, as depicted in Figure 5.
Schroeder, "Revision, extension, and validation of Jordan's formula to calculate the surge impedance of vertical conductors," IEEE Transactions on Electromagnetic Compatibility, Vol.
where 2[Z.sub.0] is the differential surge impedance. Certainly, [Z.sub.dd] in (1) coincides with the differential term of the mixed-mode Z-parameter matrix of a two-port device; however, as it has been previously mentioned in [9] and [10], a close look to (1) reveals that such expression only matches with [Z.sub.d] (i.e., [Z.sub.d] = [Z.sub.dd]) for fully symmetrical two-port devices.
The essential difference between the electrical data of overhead lines and cables is the surge impedance of their conductors to earth.
During adaptive process successfully revises parameters of the line: surge impedance, electromagnetic wave spread constant and line length.
Inductivity of this equipment together with surge impedances of the lines form transfer function on the area of frequency domain that is far enough from spectrum area of fast transients.

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