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Handbook of Water and Wastewater Treatment Plant Operations - Chapter 6

Nguyên tắc cơ bản của điện Công nhận các thiết bị điện là dễ dàng bởi vì chúng tôi sử dụng rất nhiều của nó. Nếu chúng tôi yêu cầu các nhà khai thác điển hình, nơi các thiết bị đó nằm trong trang web nhà máy của họ, họ biết, vì họ có thể hoạt động các thiết bị này, ancillaries của họ. Nếu chúng ta yêu cầu các nhà khai thác cùng một thiết bị điện cụ thể, họ có thể có thể cho chúng tôi biết. Nếu chúng ta hỏi nếu nhà máy thiết bị điện của họ. | 6 Fundamentals of Electricity We believe that electricity exists because the electric company keeps sending us bills for it but we cannot figure out how it travels inside wires. Dave Barry When Gladstone was British Prime Minister he visited Michael Faraday s laboratory and asked if some esoteric substance called Electricity would ever have practical significance. One day sir you will tax it. was his answer. Quoted in Science 1994. As Michael Saunders points out this cannot be correct because Faraday died in 1867 and Gladstone became prime minister in 1868. A more plausible prime minister would be Peel as electricity was discovered in 1831. Equally well it may be an urban legend. 6.1 ELECTRICITY WHAT IS IT Water and wastewater operators generally have little difficulty in recognizing electrical equipment. Electrical equipment is everywhere and is easy to spot. For example typical plant sites are outfitted with electrical equipment that 1. Generates electricity a generator or emergency generator 2. Stores electricity batteries 3. Changes electricity from one form to another transformers 4. Transports or transmits and distributes electricity throughout the plant site wiring distribution systems 5. Measure electricity meters 6. Converts electricity into other forms of energy rotating shafts mechanical energy heat energy light energy chemical energy or radio energy 7. Protects other electrical equipment fuses circuit breakers or relays 8. Operates and controls other electrical equipment motor controllers 9. Converts some condition or occurrence into an electric signal sensors 10. Converts some measured variable to a representative electrical signal transducers or transmitters . Recognizing electrical equipment is easy because we use so much of it. If we ask typical operators where such equipment is located in their plant site they know because they probably operate these devices or their ancillaries. If we asked these same operators what a particular electrical device