Keith Harker has spent the whole of his career in the British electrical supply industry. Early appointments were concerned with on-site commissioning and maintenance - spanning distribution, transmission and generation. In recent years he has held senior positions in transmission substation design in both the project management and engineering arms of the National Grid Company, with specific responsibility for commissioning management and associated technical processes.

• Chapter 1: Commissioning managementChapter 2: Maintenance and fault investigationsChapter 3: Power-system theoryChapter 4: Circuit breakersChapter 5: The power transformerChapter 6: Tap change and automatic voltage controlChapter 7: High-voltage pressure testsChapter 8: Underground cables and overhead linesChapter 9: Substation power suppliesChapter 10: Current and voltage transformersChapter 11: Switchgear control systemsChapter 12: Protection and control: generalChapter 13: Overcurrent and earth-fault protectionChapter 14: Distance protectionChapter 15: Unit protection of feedersChapter 16: Unit protection of substation plantChapter 17: Generator protectionChapter 18: IntertrippingChapter 19: On-load tests

Keith Harker has spent the whole of his career in the British electrical supply industry. Early appointments were concerned with on-site commissioning and maintenance - spanning distribution, transmission and generation. In recent years he has held senior positions in transmission substation design in both the project management and engineering arms of the National Grid Company, with specific responsibility for commissioning management and associated technical processes.

• Chapter 1: Commissioning managementChapter 2: Maintenance and fault investigationsChapter 3: Power-system theoryChapter 4: Circuit breakersChapter 5: The power transformerChapter 6: Tap change and automatic voltage controlChapter 7: High-voltage pressure testsChapter 8: Underground cables and overhead linesChapter 9: Substation power suppliesChapter 10: Current and voltage transformersChapter 11: Switchgear control systemsChapter 12: Protection and control: generalChapter 13: Overcurrent and earth-fault protectionChapter 14: Distance protectionChapter 15: Unit protection of feedersChapter 16: Unit protection of substation plantChapter 17: Generator protectionChapter 18: IntertrippingChapter 19: On-load tests

Keith Harker has spent the whole of his career in the British electrical supply industry. Early appointments were concerned with on-site commissioning and maintenance - spanning distribution, transmission and generation. In recent years he has held senior positions in transmission substation design in both the project management and engineering arms of the National Grid Company, with specific responsibility for commissioning management and associated technical processes.

• Chapter 1: Commissioning managementChapter 2: Maintenance and fault investigationsChapter 3: Power-system theoryChapter 4: Circuit breakersChapter 5: The power transformerChapter 6: Tap change and automatic voltage controlChapter 7: High-voltage pressure testsChapter 8: Underground cables and overhead linesChapter 9: Substation power suppliesChapter 10: Current and voltage transformersChapter 11: Switchgear control systemsChapter 12: Protection and control: generalChapter 13: Overcurrent and earth-fault protectionChapter 14: Distance protectionChapter 15: Unit protection of feedersChapter 16: Unit protection of substation plantChapter 17: Generator protectionChapter 18: IntertrippingChapter 19: On-load tests