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13 Cards in this Set
- Front
- Back
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What is the same in a WYE system? |
Coil current=phase current |
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What is the formula to find system voltage in a WYE system? |
System voltage= Coil Voltage x 1.732 |
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What is the formula to find Coil voltage in a DELTA system when you have system voltage? |
COIL voltage and system voltage are the same |
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What is the formula to find coil current in a DELTA system? |
PHASE current/ 1.732 |
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What are the 3 advantages of a three-phase system? |
Increase in power capability Less pulsating force applied Less expensive |
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Can a lineman work “safely” on a delta system bare handed from a single phase? |
Yes |
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In what way is a 4-wire WYE more reliable than a 3 wire WYE |
fault protection |
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What happens when phase sequence is changed? |
The motors will spin a different way causing all connected to work reversed |
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What is a phasing meter? |
High voltage tester used for proving phase sequence |
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What is one way a Lineworker can prevent changing rotation of phases? |
Paint jumpers on the asphalt to ensure they will be hooked up correctly |
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How do you tell the if a line is a three wire WYE or a DELTA system? |
Must check at the substation |
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What is the angle of the coil of wire on a DELTA or WYE system? What |
120 degrees |
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What does a three phase induction motor consist of? |
Stator ( stationary part) Rotor ( the rotating part) |
