Abstract
The wave-propagation characteristics of a cable installed within a tunnel has been investigated. The transient characteristic of this cable system differs from that of a cable system in which the cables are buried without tunnels. The transient characteristic is heavily dependent on both the distance from the cable to the tunnel wall and the physical parameters of the tunnel. A modeling method of the cable system installed within a tunnel is proposed based on investigation. A field measurement of transient sheath voltages on a 275 kV crossbonded cable system is made. Numerical results obtained using the proposed model agree well with field test results; thus the accuracy of the modeling method proposed in this paper is confirmed. The effects of the circuit parameters, such as inductance of the sheath bonding wire and the equivalent capacitance of the sheath protection arrester, are studied.
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