Digital Stabilizers - Horrors in our Apartment

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There are some essential points which everbody is missing:-

1. Every electrical item has something called a response time.
2. To fry you electronics takes a few milliseconds of high voltage/high current.

Now for the facts:-

Relay operated systems (unless they are using expensive solid state relays) take between 50 -100 milliseconds to act.
MCBs & ELCBs also have a similar time response.
Servo stabilisers can take upto 200 milliseconds before they start acting. Most low cost ones get into the act in about 500milliseconds.

So you use what I call the high voltage rupture discs (electrical engineers amongst you can let me know the exact technical name please!). The almost instantaneously close the line & neutral when voltage rises beyond the set value. This gives time for your MCB/ELCB to kick in. No current passes upstream of the ruptured disc. Have experienced this umpteen no. of times & saved lakhs of rupees in potential damages.
I have not seen any current ratings on these units. But I know that they are available in various voltage ratings.

PnReddy: Yes for 3 phase connection you will have 3 units across each pair of phase & neutral. But this will be only single phase protection individually. If you are using a 3 phase 440 V unit you do not require this. What you will require is a single phasing cut-out.


Sridhar

Dear Sridhar,
Thanks for the info. I do not have a 3 phase unit. However most households now a days have 3 phase input. My query was to protect all the house hold gadgets which are single phase.

Do these varistors have any ratings ?

Thanks
 
Pnreddy,

As far as I know there are various cut-off voltages available. In this matter I have been a bit of a noob - I go with one sample and ask for more!

Sridhar V
 
Just wondering if all surge strips (say from Writex, Quantum, etc) offer the same amount of protection from surge, though only a few offer this warranty scheme. Anyways the ones offering warranty (Belkin Gold series) are at least twice as expensive as the warranty-less ones. Though its a small price to pay for the immense peace of mind. Looking to get one. Thanks for the heads-up Ram.

PS: Does the warranty cover damage from surge due to lightning???
 
well i use.. normal spike protectors.. and ups..

and that works..

i had 2 ups lying unused got the battery replaced and both of them have a fuse as well as backed up with a spike protector..

nomal 500va ups gives 20mins back up for tata sky HD and LCD together with medium backlight. (that i have tested )

Why did you replace the battery? You should have checked the battery acid levels. Usually when these small 600va UPS backups fail it is because the acid in the battery has dried up. I recently opened up a 5 year old UPS which gave zero back-up. Checked the battery and it was as dry as a bone. Topped it up with distilled water, switched on the UPS and left it to charge overnight and now works as good as new....
Those batteries can even be used on bike/scooty.

By the way, what spike protector you use.... normal or Belkin Gold series?
 
Just wondering if all surge strips (say from Writex, Quantum, etc) offer the same amount of protection from surge, though only a few offer this warranty scheme. Anyways the ones offering warranty (Belkin Gold series) are at least twice as expensive as the warranty-less ones. Though its a small price to pay for the immense peace of mind. Looking to get one. Thanks for the heads-up Ram.

PS: Does the warranty cover damage from surge due to lightning???

The cost is like a lock for home, irrelevant vis-a-vis what it protects costs.

Lightning (mostly) does not come on the input side, btw.
 
Am I just the cynical one, or does anyone else think that it is one thing to have all these warranties and payments of compensation printed on the box --- and quite another to make a claim, especially a substantial claim, on one and actually get a payout?
 
Am I just the cynical one, or does anyone else think that it is one thing to have all these warranties and payments of compensation printed on the box --- and quite another to make a claim, especially a substantial claim, on one and actually get a payout?

Actually Thad, at least in the case of Belkin, it does work. They offer a substantial amount as compensation and I have heard of a few cases where they have paid.

Essentially this works on the same principle as insurance. You take premium from a million and pay insurance to a few. The upside for the company is huge in terms of client confidence. I have seen cases of people buying Belkin strips even when they do not need them. And I suspect Belkin must be having back to back arrangement with an insurance company.

Of course, all said and done, getting the payment must be a pain in the neck in terms of proving you deserve the payment.

Cheers
 
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True. Just wanted to highlight the failure part to show that there is nothing special about Belkin to make it fail-proof.

A well constructed strip will have better material, tighter contacts, better cables, fuses and other material that can tolerate fluctuations in voltage. But if you pass 2000 volts through a system that can take 440 volts, all materials do have a tolerance limit. If those have to be compensated, your strip will become so expensive they will never sell.

Cheers
 
True. Just wanted to highlight the failure part to show that there is nothing special about Belkin to make it fail-proof.

Hi captrajesh,

I was just thinking- is there a way to make my belkin fail so I can claim a fat belkin cheque - so that I can upgrade?

Regds
suri
 
A well constructed strip will have better material, tighter contacts, better cables, fuses and other material that can tolerate fluctuations in voltage. But if you pass 2000 volts through a system that can take 440 volts, all materials do have a tolerance limit.
I do understand that. Actually, my post must be read in conjunction with the one below (especially that I've highlighted) and that of Venkat's and just to imply that Belkin may not be any better than those listed below.

Just wondering if all surge strips (say from Writex, Quantum, etc) offer the same amount of protection from surge, though only a few offer this warranty scheme. Anyways the ones offering warranty (Belkin Gold series) are at least twice as expensive as the warranty-less ones. Though its a small price to pay for the immense peace of mind.

I was just thinking- is there a way to make my belkin fail so I can claim a fat belkin cheque - so that I can upgrade?
Brilliant idea (as usual:D) I think Venkat has already posted what to do.:ohyeah:
 
There are some good reasons why insurance companies do not pay out without good evidence :D

this begs the question-

How does the "twisted" audiophile go about constructing

"THE PERFECT CRIME"?

Perhaps a custom made 11,000 volt alternator powered by a 5 BHP Honda outboard gasoline engine - the output of which is (momentarily) applied to the inputs of the belkin and the amplifier (that is sought to be replaced)?

Absolutely sure that we (of this august forum) can outwit those imbeciles at belkin

Oops - I think there is need for a 50 BHP engine!!
 
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Just make sure you do it on a day when there is thunder and lightning in your area so you can blame it all on nature. :) The weatherman will then be your best evidence. Also fry a few other discarded items to add to the 'mayhem' caused by nature. Then you will certainly get the fat cheque.

Cheers
 
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