August 2015
Intermediate
550 pages
11h 8m
English
Content preview from Cable System Transients
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Chapter 5Basic Characteristics of Transients on Single-phase Cables
Akihiro Ametani
Graduate School of Electrical Engineering, Doshisha University, Kyoto, Japan
5.1 Single-core Coaxial (SC) Cable
Basic characteristics of transients on a single-phase SC cable are explained in this section based on experimental and electromagnetic transients program (EMTP) simulation results with various terminating conditions of the core and the sheath. Each case is analyzed theoretically by adopting a traveling-wave theory.
5.1.1 Experimental Observations
5.1.1.1 Experimental Circuit
Figure 5.1a illustrates an experimental setup to measure wave propagation on a 3D2V coaxial cable with a length of 90 m. The cross section is shown in Figure 5.1b, and the geometrical and physical parameters are given in Table 5.1. The cable is laid on a building floor and is folded at the center as in Figure 5.1c so that the sending and receiving ends are placed nearby on an Al plate to measure voltages. This solves problems of power source and oscilloscope grounding, simultaneous measurements of voltages and currents at the sending and receiving ends of the cable, and also voltage reference for the voltage measurement. It is not well understood that there is no power source, no voltage reference and no terminal to ground the power source, the impulse generator and the oscilloscope in a field, for example, in a construction site of a substation and a transmission line. A pulse-like voltage as in Figure 5.1
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