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Single Phasing Fault in 3 - Phase Motor | Motor Single Phasing 

Electrical lectures
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Single phasing fault in 3 - Phase motor is considered to be the very serious fault because in running condition when single phasing occur or when one phase break or disconnected, the motor tries to rotate the load in turn it draws excessive current which results in burning of windings.
I have also showed how much current will flow when single phasing occur.
#singlephasing #singlephasingmotor #electricmotor #electricallectures

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28 ноя 2021

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Комментарии : 38   
@myasir8129
@myasir8129 2 года назад
very serious fault well explained
@jbthegreatvlogs523
@jbthegreatvlogs523 2 года назад
Thanks i learn more about elec.
@jbthegreatvlogs523
@jbthegreatvlogs523 2 года назад
Jb the great vlogs sending you a full support
@electricallectures
@electricallectures 2 года назад
Thanks alot
@bhupendraaditya6960
@bhupendraaditya6960 Год назад
Thank u so much sir.
@electricallectures
@electricallectures Год назад
Thanks. Stay tuned and dont forget to subscribe plz
@bnee4313
@bnee4313 5 месяцев назад
does motor starter turn off if one phase is missing while in operation?
@Xtreme49
@Xtreme49 Год назад
If one of the phase gets loss but the fuse to that phase is still close will backfeeding happen back through that phase. In a 3Ph 4 Wire system
@electricallectures
@electricallectures Год назад
Its not that for no reason phase is lost. Without any thing open circuit from load to sorce, the phase cant be lost. In that case no current will flow in it
@muhammadwaqas427
@muhammadwaqas427 2 года назад
Grateful. How can we avoid single phasing
@ElectricityFrenzy
@ElectricityFrenzy 2 года назад
You can use phase loss protection relay.
@that1electrician
@that1electrician 6 месяцев назад
Size your overloads properly.
@conybrown991
@conybrown991 Год назад
Experienced this first hand 10 years ago, i was blamed of purchasing an incompitable motor by an AM who was responsible for electrical installations from MCC to motor. I knew very well the motor i chose was compitable to the system as it was a duty standby design and duty one had been working normally without a single fault for 3 months. When the standby pump manual start button was pressed, the motor started to rotate and within a mintue 10K USD was lost. PM asked the AM to check the system comprehensively and the AM replied everything was checked, nothing unusual was found, and it was my mistake leading to the loss. I was then asked to purchase another motor to correct my mistake, and within a mintue after the pump was started another 10K USD was lost. The PM then asked the motor supplier to check what happended and figured out one phase wire was not connected at all. From the very beginning to the end, the PM didn't blame me and I didn't say a single word on this, but the AM never aplogized this.
@electricallectures
@electricallectures Год назад
Unfortunate but that happens in the field. Thanks for sharing your experience
@that1electrician
@that1electrician 6 месяцев назад
So like, you don't ohm out all your coils and do a megger test before installing a new motor? That's like rule #1 my guy. Make sure you're not about to waste your time rigging in and connecting an already-bad motor...
@bernardob.bacanijr9365
@bernardob.bacanijr9365 2 года назад
What do you use in 3phase motor to avoid damaging? thank you
@electricallectures
@electricallectures 2 года назад
Overload relay whether it is thermal or electronic but I would prefer electronics for its accuracy. OL protects the motor in event of faults
@haxboi5492
@haxboi5492 Год назад
Use a breaker that pops all three phases instead of seperate ones
@that1electrician
@that1electrician 6 месяцев назад
​​​@@haxboi5492Wrong answer. Breakers are used as short-circuit protection. Single-phasing is NOT a short circuit, so chances are your motor is gonna burn up long before your breaker ever trips. Overloads are designed to catch things like single phasing. The bimetal element will heat up and trip a lever that'll drop out the auxiliary OL contact that's wired in series with your contactor coil. Size your overloads (and motor branch circuit wiring) correctly... 125% of FLA.
@bernardob.bacanijr9365
@bernardob.bacanijr9365 2 года назад
Can you tell me what are the problems of single phasing protection for 3 phase system can you ask for 3 to 5 problems? sir thank you
@electricallectures
@electricallectures 2 года назад
I dont cleay understand what u want to ask
@shivamrathi987
@shivamrathi987 Год назад
overheating, insulation damage, vibration
@myasir1355
@myasir1355 2 года назад
@mohdhazhari3778
@mohdhazhari3778 2 года назад
I had problem..got voltage on all phases but no amp on Red phase..what causes the problem?
@electricallectures
@electricallectures 2 года назад
Ur connection to the motor is open. From contactor
@mohdhazhari3778
@mohdhazhari3778 2 года назад
@@electricallectures u mean the winding?already check the connection,all in good order..been doing continuity test..got reading on w1-v2..its not normal rigth?
@mohdhazhari3778
@mohdhazhari3778 2 года назад
@@electricallectures im using auto trans starter..when switch on,run and star contactor energised..got amp reading on Red phase,but when main contactor energised,the amp on R are 0 amp
@electricallectures
@electricallectures 2 года назад
If star delta starter is used tgen delra contactor j Has one phase open
@SyedAlthaf-hg2kn
@SyedAlthaf-hg2kn 3 месяца назад
One phase high amppere problem solution
@binonna7980
@binonna7980 7 месяцев назад
how 173 % comes
@el-dorado4645
@el-dorado4645 2 года назад
how to carry test
@electricallectures
@electricallectures 2 года назад
What type of test
@el-dorado4645
@el-dorado4645 2 года назад
like Earth fault ,short circuit test how check that which phase is fault
@electricallectures
@electricallectures 2 года назад
This can be done manually through multimeter after disconnecting the motor
@el-dorado4645
@el-dorado4645 2 года назад
how we check in motor terminal box
@electricallectures
@electricallectures 2 года назад
Best way to check it first from the contactor then come to motor terminal
@anonymousperson2578
@anonymousperson2578 Год назад
Jogdish? Is that you?
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