How to check your Electrical motor winding - Continuity & Insulation resistance test
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- เผยแพร่เมื่อ 31 พ.ค. 2024
- #How to test 3 phase motor with a multimeter. Electrical Fault finding and 3 important test to determine if an electrical motor is faulty.
#3PhaseMotorConnections #3phaseMotorTest
#ElectricalFaultFinding #TroubleShooting #Meggertest #ContinuityTest #InsulationResistanceTest
#Electrical circuits #Electrical Maintenance
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Wow! Well explained. Thanks for sharing it with us. I really appreciate it. I learnt three steps
1. Visual inspection; check for burnt cable etc
2. Continuity test; using the ohm meter or digital multimeter
3. IR test; using the meggar or Insulation Resistance tester
The connection is star not delta !
That’s right
He corrected himself in the video using captions
How can one determine in the a particular motor is connected in star or delta configuration?
How can one determine the configuration of the motor?
@@ucheinnocent2680 The motor spec/model plate has that info. If it doesn't, you have to do resistance testing to find the coils, and then either wire them series or parallel. Honestly if you don't know how to tell the difference, you shouldn't be working with electricity unless you learn what you need to before ever touching it.
Your explanation is clear and to the point. 🎉 thank you
Thank you for the video. basically to check insulation value you dont need to disconnect the star configuration (unless you encounter a bad reading and then start checking separately) if CB is off you can check the insulation test as it is.
You're the first I've heard and seen in practice not disconnecting the star configuration.
@@mosesabunike2055 when circuit breaker is off. The cable is connected with the motor coils and joined in star connection. If you make insulation test with the chassis, you can make from every terminal in cb with the chassis. And if problem found then you can start disconnecting to isolate the problem. Both cable and winding can carry 500V dc pulse.
That’s right
Good job mate👍
Great video tutorial 👍♥️ thank you for sharing your knowledge ♥️🇵🇭
My pleasure 😊
please do a video on how to build an2 rig o have a lot problems with sorting out this test been blocked from doing the British an2 but need to build an am2 myself to sort my problems thanks
Where are you putting your red probe when testing the windings? Was it the earth terminal or chassis?
Hi, its not 1 mOhm, but its infinity sign (I), so IR value is more than 200 mOhms @500V in this case.
I was confused before I see your comment. 1 Mohm is bad.
Imagine how bad one milliOhm is. :)
Thank you for the lesson.
GOD bless you.
Cool 😎💯
Nice
Very good
Thanks
What is the minimum resistance value need for a winding? Is there any equation for that?
Thank you very much brother
great video so far,i like it and subscribe waiting for more video!
What topic would you like to see
@@maintenanceengineeringinsider more in motor maintainance and repair,also automation from basic.
@@maintenanceengineeringinsider more in motor maintainance and repair,also automation from basic.
Thanks
Is it okay if one of the measurement is ~800 m ohm and the others is above 5 g ohm?
Great video mate except the connection i believe is in star
He said it was star NOT delta
Thanks mate
You're welcome :)
Hi after i remove the main supply cable, when i do insulation test do i need to take test on all the windings or just U2,V2 and W2?
@samurai X , You remove the configuration plate, and you do insulation resistance test between U2 & V2, U2 & W2 , U2 & Chasis.
Repeat the same process with V2, and then repeat the same process with W2.
@@maintenanceengineeringinsider thanks for the fast reply, can i know why there is no need to take at U1,V1 anz W1? Or what test can do at U1,V1 and W1?
@@samuraix8903 U1, , V1 and W1 are three sets of coil, which are known as winding. U1 is the opposite end of U2. So when you test U1 or U2, you have tested one winding.
I will make a short video about this for you ASAP .
@@maintenanceengineeringinsider ah so means i have to do insulation test of the winding on U2, V2 and W2 as well to check if its bad?
@@samuraix8903 th-cam.com/video/YZVi8FMfF5o/w-d-xo.html
thank you so much . how about contactor coil test
I can make another video if that, thanks for suggestions
I have a question, between shaft and earth, motor must be in continuity or open circuit?
I dont believe its part of the electrical tests, required for Asynchrounous motors.
please if a single phase motor is continuous horn,what will be the cause sir.
That’s a wye connection not delta.
Someone said too. I had to rewind to confirm. A delta would have diagonal across and and one cross over.
Do a single phase motor test too please. Would like to see what happens when capacitors are involved. ...
Thank you for suggesting a topic. I don't have a single phase motor, and i will source for it. Single phase motors have two sets of windings and the charge stored up in a capacitor will simulates a third winding. I reckon that the tests should be similar. However, perform test on the capacitance of the capacitor as well.
We will prove this, in the future.
Capacitors, thermistors should be isolated from the windings under check, otherwise you will get improper readings. Meggering is both science and art.
@@maintenanceengineeringinsider can you please, answer me some basic question about? Thanks
How may i help ?
OL between any winding( U1,V1 etc) and earth is it a fail?
Open loop (OL) during a continuity test, between the windings of an inductor motor is good. Because it means that there is no contact between the windings.
However, It is very important to test each winding with the chasis of the motor and make sure it is reading OL.
OL could be good or bad, depending on what you are testing for.
Sir I like your videos very useful I need to know how to injuct resistance test again
It is expressed in the video. Put your multimeter to Resistance measurement, then check for low resistance, less than 100 ohms. If the measured resistance is high, then there is a problem
What happens if it's over 2megaOhm does it still pass or fail
Yes, the aim is to get a reading on, or above 1 MegaOhm. The higher the resistance of the insulation material, the better. 1MegaOhm is the minimum recommended by the Eletrotechnical governing body.
Appreciate if you could take a faulty ( broken) motor for this demonstration
th-cam.com/video/DIsUUdYbN_c/w-d-xo.html
START CONNECTION!!!
Si, configuracion en estrella
Good video, thanks. Why did you choose 500V and not 250V or 1000V?
I think because maybe the motor is required 480VAC so by using 500VAC your able to push electrons through and read the ohms. I’m still learning myself and not sure if I’m right. Lol
@@varnchlarson I think the mega pushes 500V DC so not sure if your theory would make sense. good thought tho
Hi , I used 500VDC to inject into the winding of the Induction motors, so that i can test to seek if there is any weakness in the insulation or the winding of cables.
The nominal voltage for this electrical motor is 400VAC. It could be tested with 1000VDC as well. But this is how I was thought and it works for me.
@@maintenanceengineeringinsider so as to save the thermistor (if there is one).
I normally disconnect the thermistor (temperature circuit) and use 1000V. I believe the 1 kV test gives me a more sensitive test. And since these tests are infrequent, I want to catch any pending fault.
Its connected in star teacher
Yah...I noticed that error too
Are you preparing for trade test or what? This motor is connected in star not delta.
Sir thanks your but I didn't clear injuct 500 v
I Thought electric motor resistance depends on the size of the motor that's why we use R=V/I
What ended up being the problem?
I think nothing. This other 2 video have a different result.th-cam.com/video/DIsUUdYbN_c/w-d-xo.html ;
th-cam.com/video/df3K5aU_nyw/w-d-xo.html
That is a star connection
Bro I am so lost 😢 I know nothing of electricity and I'm trying my best to check these conveyor motors. 😅
The lead ra short that mean the motor is connected in star
Why, I don't see any capacitor in that motor. Is it a 3-phase, isn't it?
Its a 3 phase AC motor. Capacitors are only present in a Single phase AC Motor.
your resistance always still 1 ohm? you should remove every wire and the connection is star not delta.
Resistance = 3.5 Ohms all coils.
Insulation Resistance = "'I'" means Infinity and in this case its more than 200mOhms. (max range of meter @500V).
Can you plz show
Hi, i do not understand what you want help with?
But not see the reading
Informative video, thank you. However, that motor configuration is delta, not wye
REPEAT AFTER ME #STAR STAR STAR STAR NOT DELTA
Thats not delta connction its a wye
Dude is hard to listen to. Missing a couple crayons.
Never stated voltage rating of the motor. English skills need improvement
Hi, the voltage rating does not really matter here, when performing either Continuity test or Insulation resistance test.
As per improvement, i totally agree with you. Hablo fluidamente en 4 idiomas.
Asųsų one ka ina asų?
@@maintenanceengineeringinsider shouldn't the voltage rating of the motor be known as to select the right test DC from the tester ?
575v motor 1000v test
240v motor 500v test. etc....
@Ron Spencer, In Factories in England, we run Asynchronous motors at 240 VAC or the more commonly used 400VAC. I run my insulation resistance tests at 500VDC.
This is enough to search out and indicate weakness in the insulation.
You do have a reason too. The Insulation resistance tester allows user to inject either 500VDC or 1000VDC. Whichever way, the reading must remain between 1 Megaohm and 2 megaohms. Any reading under 1 Mega ohm is a fail
He speaks better English than many people in England..
@@maintenanceengineeringinsider Please say correctly. Reading above 1mOhm is OK and not between 1 and 2mOhms.
DUDE! THY DO YOU TAKE TO LONG ? SOUNDS LIKE YOU ARE DRUNK
Nice