Summary: Electrical Craft Principles, Volume 1 | 9780863419324 | John Whitfield
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Read the summary and the most important questions on Electrical Craft Principles, Volume 1 | 9780863419324 | John Whitfield
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12.4 three phase ac supplies
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What are the voltage and current relationships in a delta connection for balanced systems?
- Line voltage (\(UL\)) = Phase voltage (\(Up\))
- Line current (\(IL\)) = \(Ip \times \sqrt{3}\)
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What are the wires called in a three-phase supply?
- Lines
- Identified by colors: brown, black, grey (or red, yellow, blue)
- Markings: L1, L2, L3
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What are the voltage and current relationships in a star connection for balanced systems?
- Line voltage (\(UL\)) = \(Up \times \sqrt{3}\)
- Line current (\(IL\)) = Phase current (\(Ip\))
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What is the common AC supply system used in most countries?
- Three-phase AC system
- Generates, transmits, distributes energy
- Common in most countries
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What are the currents flowing in the lines known as?
- Line currents
- Symbol: IL
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Where are three-phase supplies often used?
- Industrial and commercial premises
- Drives motors, heaters, furnaces
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How is a symmetrical three-phase supply achieved?
- Rotate wire loop in magnetic field
- Three loops, 120° angle each
- Provides symmetrical supply
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What is the potential difference between any two lines called?
- Line voltage
- Symbol: UL
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What is a star connection with a neutral used for?
- Used if each load part takes a different current
- Known as three-phase four-wire supply
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What are the coil markings in a three-phase system?
- Coils: L1, L2, L3
- Colors: brown, black, grey
- Each coil has two ends
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