August 2015
Intermediate
550 pages
11h 8m
English
Content preview from Cable System Transients
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Chapter 7Examples of Cable System Transients
Teruo Ohno
Tokyo Electric Power Company, Tokyo, Japan
This chapter introduces examples of transients peculiar to cable systems [1]. Most of these transients are also studied with long ultra high voltage/extra high voltage (UHV/EHV) overhead lines (OHLs) but are considered more common to cable systems. These studies are performed as a part of feasibility studies, implementation studies, and forensic studies with a different degree of precision in a model setup. The implementation study is the stage where these studies are performed most frequently as they can affect the selection and the specification of related equipment of cable systems. For example, the leading current interruption and the zero-missing phenomenon can affect the selection and the specification of line breakers, and the cable discharge can affect those of voltage transformers.
Among the overvoltages discussed in this chapter, temporary overvoltages are most important for cable system transients since severe temporary overvoltages have been observed in past studies. Slow-front overvoltages related to cable systems are less severe compared with those related to OHLs. However, their differences are explained to help readers understand why slow-front overvoltages are less severe with cable systems.
7.1 Reactive Power Compensation
Cable lines become sources of reactive power like shunt capacitors. Especially, long EHV cable lines produce large reactive power and usually ...
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