Коэффициент первого отключающего полюса

English translation: First pole clear factor

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Russian term or phrase:Коэффициент первого отключающего полюса
English translation:First pole clear factor
Entered by: Serhiy

12:03 Feb 16, 2019
Russian to English translations [PRO]
Tech/Engineering - Energy / Power Generation / релейная защита и автоматика
Russian term or phrase: Коэффициент первого отключающего полюса
Параметр в таблице с паспортными данными выключателей:
Постоянная времени постоянного тока отключения при коротком замыкании
Компонент номинального постоянного тока отключения КЗ при отключении контакта, при постоянной времени номинального тока КЗ
Коэффициент первого отключающего полюса
Serhiy
Local time: 14:14
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

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Note added at 1 hr (2019-02-16 13:07:59 GMT)
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прошу прощения, пропустила *to*
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IrinaN
United States
Local time: 06:14
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3First pole clear factor
IrinaN


  

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49 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5
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*

IrinaN
United States
Local time: 06:14
Specializes in field
Native speaker of: Native in RussianRussian
PRO pts in category: 28
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