Why Varistor Is Used? MOV, Varistor and VDR Explained
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- Опубліковано 28 лип 2024
- Why Varistor Is Used?
A varistor (voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. Varistors are used to protect a circuit from high voltage surges. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit.
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Timestamp
00:00 - Over Voltage
00: 23 - Varistor Working
03:24 - Connection of Varistor
#MOV #electrical #electronic #electrician #interview
Very good information to protect our Electrical Appliances from high voltage.
Could u please tell what is the value of varister to use in the electric current plug
Thank you so much. Pro HVAC. Beginner in electronics, so that I can fix PCBs in my industry. Mainly mini split and inverter heat pumps. I’m so glad yours are in English too.
These devices are normally fitted on the pcb, not in a 13A plug.
I have Categorically NEVER seen one of THOSE fitted INSIDE a PLUG!!! ...they need their own enclosure, precisely for when they do their job and Blow the Fuse because of a Surge (said sub-enclosure must be able to safely contain said 'BANG''
I thought about this and the MOV really is it's own protection device. It is only for surge voltage and the mov has a very fast transient response time rather than steady state so as soon as the voltage event is over the MOV stops conducting. The fuse is there for over current events from the load it is feeding. But I'm with you on the thing inside a plug it's comical.
They don't "Bang" like a fuse and if specified correctly for the level of transient they are used to protect against should survive indefinitely. They are specified by the energy in Joules they will dissipate in the very short-duration spike in voltage which causes them to conduct.
Yes it seems a bit strange putting one inside a BS 1363 plug top and if the appliance needs it they're usually incorporated anyway, but if there's space and it doesn't affect dissipation of the MOV or creepage/clearances inside the plug top then I don't see a problem. It is also not accessible without the use of a tool per the regulations.
Edit: The more I think about this, it does seem to have some potential issues due to the location in the circuit. The energy at the source of the impulse voltage is likely to be significantly higher at the plug than inside the appliance where MOVs are usually located. This is because the impedance of the mains lead would reduce the energy in the impulse. This follows the Installation Category principles. A MOV in the mains plug would need to be of a higher energy rating and physically larger than one fitted in the appliance.
These are the things that put inside power socket strip strung between terminals like this. Costs 3 cents and they charge another 20 dollars for Surge Protected
What you know????
anthonybooth maybe you're referring to Zener Barrier they are really clever used in intrinsically safe stuff like in mining and chemical
How long can the varistor sustain full current flow? Is it milliseconds or seconds? Can they be used to feed power to a device and prevent low voltage operation? For example I want to prevent my RPi from coming on if the voltage is less than 5 volts. Thank you.
Excellent basics👍
You have very precisely described the importance of MOV And fuses I wish you all the best and request you to please post more information on safety electronics items
I recently got a gift operated on (24 volts AC power 20-40VA only)
Please suggest MOV AND fusable Resistor 🙏
Thank you, for a very well explained video about mov protection.
Nice video explaining the concept
Very good explanation. Thank you.
Nice explanation. Can you specify some MOV numbers for 230v AC circuits. ?
Thanks for the details.
Excellent tuition. Many thanks.
Good information & suggestion but you didn't mentioned the value of MOV which we can use in plugs or in line to protect our Electrical Appliances....????
How is the "Varistor voltage" determined for use in any circuit or to provide power protection just by looking at the varistor itself?
Very well said. Thank you. Very good explanation. This is what I am waiting for.
Nice teaching, Engineer pls what is the capacity of the varistor, that is the power rating and resistance? Do we have varistor on DC circuits ?
Thanks
Is very understandable
It’s safe to install mov especially for high wattage appliances. The query is how to determine what value of mov has to install. Please guide.
Very good explanation in short words.👍
Thank you for the information.
What is the part number for VDR that we can use for 230v AC?
Thanks.
Thank you!
Thank you
Does this component help a GFCI to work correctly? Thanks for your video.
Good video, what are the vdr values available in the market
Damn I've seen those in use in the plant at work at but had no idea why they were installed ,even when I asked the older maintenance guys they also had no idea what these do, thanks for video it was super informative.
Same here Man!! Thanks So much Sir!
For 230 AC supply . what is a suitable value available 14D _ _ 1 K
Thank you ❤
MOV should attached on far side of fuse; they occasionally fail short !!
what if we connect caps instead of varister?
will the flyback charge the caps?
we can use the charge in the caps for other work
How to select mov domestic appliance purpose please explain sir
I have this situation: a SEW 1.1 kW motor with a 180 DC brake. The brake (and the motor) is supplied from a Siemens G115D frequency inverter. I need to protect the brake, using a Varistor. How do I calculate the size/type of the Varistor? And do I need to protect the Varistor itself from too high current?
I have never seen one inside a 🇬🇧 plug and there isn’t room for one = we have the cartridge fuse in the plug for protecting the wire from the plug to the appliance, I tend to find the MOV inside the appliance itself
Its not a click bet some of the companies provided this to protect the electrical devices not in all but only in few.
But the concept of the video is to tell you how a MOV Can protect your electrical Devices
@@TheElectricalGuyI too have never seen this in any plug, and I agree there is not enough room to put it in
Can you suggest what number MOV should I use for my TV and other electronic device pluy on extension box . I am Mumbai
I have 2 makita chargers who do not charge/red-green light flashing. I measured 230+ volts over the varistors pins when plugged in. Can i assume the varistors are damaged? Regards
Plz share a clear image of circuit (plug), and how to choose that MOV
Your explanation as far as the operation of an MOV is ok. But your explanation does not cover the practical side properly. All mov's come in various triggering voltage and current clamping ratings. To effectively use an mov for voltage surge and spike protection, a good quality fuse of the appropriate rating is the first requirement. The rating of this fuse is selected, based on the device it is powering. Once this fuse rating is selected, the mov clamping current rating is selected, to be at least 50% higher than the fuse current rating, so that it is capable of rupturing the fuse easily, without damaging itself. The voltage rating of the mov is selected depending on the maximum voltage that can be safely tolerated by the protected device. And finally, it is not recommended to install an mov inside a plug top, for physical safety reasons.
Thank you for adding the information and it is relevant to the topic. 👍
Thanks a lot 🙏
Much support from 🇿🇦 ZAR- Durban Rich Future by DSK Clothing ❤
so I will just put this in the plug of my DIY power extension cord in parallel to the AC source?
Hi, can anyone tell me the difference between varistor 14S471K and 14D471K if there is any?
Regards
Refer to the manufacturer's data sheet - Simples 😁
Refer to the manufacturer's data-sheet - Simples😁
At 7:25 If the MOV is burnt will it be shorted or open?
It will depend on the source energy level available and whether it's downstream of a suitable fuse.
MOV'S are usable for only a single surge. Therefore, not sure if using it across a switch is a viable idea...
MOVs aren't single shot devices. Provided they are used within their specifications they should last indefinitely. Ideally it should be connected downstream of the fuse so it's protected by the fuse but that's not easy with the fuse carrier in a BS 1363 plug top.
I have never seen anything other than a fuse in a standard three pins plug. Such standard plug is not design for adding a MOV with expose legs that can cause short circuit.
Still such MOV connection does work as cheap improvised voltage surge protector to accelerate blowing of fuse as extra protection to electric appliances.
This is especially essential in poor countries like India & Myanmar where power supply is very unstable.
Also in region lacking of lightning strike protection that always burn entire building electronic devices during a thunder strike, such MOV can act as cheap improvised surge protector in extra protection.
However its recommended to use standard surge protector install in circuit breaker board or wire extension for proper protection, which can be reset after get trigger to cut off power supply safely.
Otherwise make sure the MOV is connected behind a fuse (not before) to prevent sustainable spike of current like short circuit during long voltage surge.
If i remrmber correctly, in Three Phase power supply lines, when the bad grounding of a star connection is loose, the voltage between two lines (Live & Neutral) will swing from 220V to 440V burning all the electrical devices. I had such bad experience living in a backward country.
Thanks for elaborate explanation.
Default sound level too low.
I use hearing aid
Good explanation. Thanks for making the video.
Nobody understands the concept, he just reads whatever is there in a book!!😂!!
Kindly increase the volume level of this video, Bcoz Ur voice is so low to understand.
You need to check your phone or computer because his volume is perfect.
Very Bad to argue than resolve the issue.
His sound has owez been 💯 perfect. Just check ur 🔊 output settings well
@@sufianwarsi3000Sound is perfect on my mobile device.
The problem seems to be with your device.
Firstly it is not within the other poster's capability to resolve the issue. I don't know why you think it would be.
Secondly, by his telling you that the sound is perfect for him, is not him being rude. He is giving you information to help you diagnose the problem. That is a good thing.
Wrong explanation - resistance does not decrease linear with applied voltage.
Your ridiculous use of the cursor makes the video unwatchable for me.
OCD issues for you?
If You want to teach, then You need to slow down and speak at a slower pace!
No problem understanding the OP!! His Teaching is fine, your listening needs adjusting Please!
Speed is fine.