Offshore Electrical Engineering

The majority of the systems covered here operate at a nominal voltage of 24 y dc and, although it is not necessary for each of the above systems to have separate battery and battery charger systems, the grouping criteria require more detailed discussion. These are covered in chapter 5, as is the need to provide dual chargers and batteries for certain vital systems. In addition to the above systems there are, of course, switchgear tripping/closing supplied and engine start batteries which are dedicated to the equipment they supply. In the case of engines which drive fire pumps, duplicate charges and batteries are also required. This subject is discussed in chapter 4. This work is intended to be of interest to both technical readers and to general readers. It covers electrical engineering in offshore situations; much of the information offered has been gained in the North Sea. Some topics covered are offshore power requirements, generator selection, process drivers and starting requirements, control and monitoring systems and cabling and equipment installation Offshore Electrical Engineering is written based on the author's 20 years electrical engineering experience of electrical North Sea oil endeavor. The book has 14 chapters and five important appendices. The book starts with designing for electrical power offshore application, especially with aspects that are different from land based structures, such as space and weight limitations, safety hazards at sea, and corrosive marine environment. The criteria for selecting prime movers and generators, for example, gas turbines and reciprocating engines, depending on the type of applications, are examined. The machinery drives are then discussed whereby the different offshore electric motor ratings are considered. As in any electrical system, the use of ergonomically designed controls is important. Distribution switchgear, transformers, and cables are described. The book also explains the environmental considerations, power system disturbances, and protection. In an offshore structure, lighting requirements and subsea power supplies, diving life support system, and equipment protection are emphasized. A reliability analysis is also included to ensure continuance of service from the equipment. A general checklist to be used when preparing commissioning workscopes is included, and due to space and weight limitations on offshore installation, the rationale of maintenance and logistics options are explained. The appendices can be used as guides to descriptions offshore installations, typical commissioning test sheets, computerized calculations program, and a comparison of world hazardous area equipment. The text is a suitable reading for offshore personnel, oil-rig administrators, and for readers from all walks of life interested in some technical aspects of offshore structures. Content: Front Matter , Page iii Copyright , Page iv Preface , Page ix Acknowledgements , Page x Chapter 1 - Introduction: offshore power requirements , Pages 1-9 Chapter 2 - Electrical system general requirements , Pages 10-19 Chapter 3 - Prime mover and generator selection , Pages 20-38 Chapter 4 - Process drives and starting requirements , Pages 39-51 Chapter 5 - Control and monitoring systems , Pages 52-67 Chapter 6 - Generation and distribution switchgear and transformers , Pages 68-86 Chapter 7 - Cabling systems and equipment installation , Pages 87-127 Chapter 8 - Environmental topics , Pages 128-146 Chapter 9 - Power system disturbances: prediction and protection , Pages 147-181 Chapter 10 - Offshore lighting , Pages 182-199 Chapter 11 - Subsea supplies , Pages 200-209 Chapter 12 - Reliability , Pages 210-229 Chapter 13 - Commissioning , Pages 230-254 Chapter 14 - Maintenance and logistics , Pages 255-257 Appendix A - Guide to offshore installations , Pages 258-266 Appendix B - Typical commissioning test sheets , Pages 267-271 Appendix C - Simple three-phase fault calculation program , Pages 272-278 Appendix D - Commercial programs for load flow, fault and transient stability , Page 279 Appendix E - Comparison of world hazardous area equipment , Pages 280-282 Bibliography , Pages 283-289 Index , Pages 290-295 Covers certain specific systems utilized in offshore engineering and tested in the North Sea, such as general alarm systems, platform PABXs, marine radio telephones, aeronautical VHF radio, non-directional beacons, satellite subsea well control systems and more.