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Preface to Second Edition In the undergraduate electrical engineering curriculum, much emphasis is placed on electronic, communication, control and computer engineering. Power engineering is also an essential field, which may be neglected in some universities. Besides the traditional topics such as three-phase circuit, magnetism, electromagnetic devices and DC machines, we introduce low voltage (LV) system including utility LV network, earthing arrangements and electrical installations from 15 kVA to 3000 kVA. Approximated by using a single-phase representation, the calculations of voltage drop, earth-fault and three-phase fault currents can be introduced. It is felt that a basic understanding of earthing is essential and the various earthing arrangements available in the LV system are good examples for the illustration of system earthing. The majority of electrical engineering graduates will possibly encounter more applications in the LV system rather than the traditional generating and transmission system. The integration of LV system at both the device and system levels into the undergraduate curriculum of electrical engineering is therefore, relevant and practical. In the second edition, Chapter 3 has been revised and the numerical expression for the degree of adequacy of the overcurrent and short-circuit protection are introduced. The concept of touch voltage and the requirements of electric shock protection for TT and TN-S system have also been revised in Chapter 4. For illustration, the assumptions made in all the examples are now clearly stated. The latest CP5, IEE wiring regulations and the relevant up-to-date IEC, BS and Singapore standards are referred. Common technical terms, design formulae, touch voltage, per-unit calculation, tutorial questions and model examination questions with solutions are provided in the appendixes. Teo C Y
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