GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW) | ||||||
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12:03 Feb 16, 2019 |
Russian to English translations [PRO] Tech/Engineering - Energy / Power Generation / релейная защита и автоматика | |||||||
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| Selected response from: IrinaN United States Local time: 05:55 | ||||||
Grading comment
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Summary of answers provided | ||||
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3 | First pole clear factor |
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First pole clear factor Explanation: http://electrical-riddles.com/topic.php?lang=en&cat=13&topic... K = U1/U2 K= First pole to clear factor U1= RMS voltage between healthy phase and faulty phase U2= phase to neutral voltage with fault removed In three phase systems if fault dose not involve the earth, the voltage across the circuit breaker pole first to clear is 1.5 times the phase voltage. The arc extinction in the three poles of three phase circuit breakers is not simultaneous as currents are 120 degree out of phase. In practical systems the recovery voltage of the pole first to extinguish the arc is of the order of 1.2 to 1.5 times of the phase voltage. https://www.scribd.com/doc/147082261/What-is-First-Pole-Clea... First Pole to Clear Factor is defined as the ratio between:1- The voltage on the terminal of the first pole of the circuit breaker to clear the three phase fault, which is normally the most highest and sever voltage -------------------------------------------------- Note added at 1 hr (2019-02-16 13:07:59 GMT) -------------------------------------------------- прошу прощения, пропустила *to* |
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