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Voltage fluctuation caused power supply failure

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  #1  
Old 6th May 2009, 11:49 AM
 
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Voltage fluctuation caused power supply failure


This I am writing to know the possible ways to avoid damage to amplifiers due to voltage fluctuations.
Actually couple of days back in my locality voltage supply reached 400V. Unfortunately my Yamaha amplifier was on at that time, due to this high fluctuation it switched off automatically. When voltage came back to normal level it never turned on. Luckily my amplifier was under warranty and yesterday I got it back. Its runnning fine now.

But, when I asked service center guys about how to avoid this in future. They said using voltage stablizers is only 50% safe. Still your amplifier will be in danger.

So my query is, is it really true (50% logic) Or can we really protect our amplifier from voltage fluctuations?
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Old 6th May 2009, 11:58 AM
 
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Re: Voltage fluctuation caused power supply failure

Hi vivekam

Use a good quality Servo Stabilizer 1 kVA . This should solve the problem. If there is lot of fluctuations in your area , use a isolation transformer along with the stabilizer. This should give you constant power supply and thus prevents your equipments from fluctuations.

Vijay.
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Old 6th May 2009, 12:15 PM
 
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Re: Voltage fluctuation caused power supply failure

Quote:
Originally Posted by dali View Post
Hi vivekam

Use a good quality Servo Stabilizer 1 kVA . This should solve the problem. If there is lot of fluctuations in your area , use a isolation transformer along with the stabilizer. This should give you constant power supply and thus prevents your equipments from fluctuations.

Vijay.
Hi dali,
Fluctuations occurance chances are minimal. It reached to 400V due to some short circuit in transmission line.

I see your location as Pune. Can you please guide me from where can I get servo stabilizer in Pune. Also it would be great if I get to know approx. price.

Thanks,
Vivekam.
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Old 6th May 2009, 12:21 PM
 
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Re: Voltage fluctuation caused power supply failure

Hi Vivekam

I use a servo Stabilizer from Vertex ( recommended by most of the members from this forum ) I use 2KVA and the price i paid was Rs.13k , shipped directly from Chennai.

vijay.
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Old 6th May 2009, 12:26 PM
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Re: Voltage fluctuation caused power supply failure

Quote:
Originally Posted by dali View Post
Hi Vivekam

I use a servo Stabilizer from Vertex ( recommended by most of the members from this forum ) I use 2KVA and the price i paid was Rs.13k , shipped directly from Chennai.

vijay.
Hi Vijay

did you notice a difference in SQ with and without stab?

TIA
Regards
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Old 6th May 2009, 01:01 PM
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Re: Voltage fluctuation caused power supply failure

Quote:
Originally Posted by vivekam View Post
This I am writing to know the possible ways to avoid damage to amplifiers due to voltage fluctuations.
Actually couple of days back in my locality voltage supply reached 400V. Unfortunately my Yamaha amplifier was on at that time, due to this high fluctuation it switched off automatically. When voltage came back to normal level it never turned on. Luckily my amplifier was under warranty and yesterday I got it back. Its runnning fine now.

But, when I asked service center guys about how to avoid this in future. They said using voltage stablizers is only 50% safe. Still your amplifier will be in danger.

So my query is, is it really true (50% logic) Or can we really protect our amplifier from voltage fluctuations?
Am surprised that the Yamaha service centre guy told u that the stab can only offer about 50 % protection.
A well made servo stab from vertex, Argo etc with over /under voltage cut off should offer adequate protection IMO. We had checked the Argo stab on a VARIAC and the stab cut off when the incoming voltage crossed 250V
U can get 3 KVA servo stabilizers for as low as 3K in bbay where as a 3 KVA Argo is about 12 K so if one opts for the former one is in trouble but if one opts for reputed brands one should be safe.
Rgds
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Old 6th May 2009, 01:55 PM
 
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Re: Voltage fluctuation caused power supply failure

Quote:
Am surprised that the Yamaha service centre guy told u that the stab can only offer about 50 % protection.
Same surprise factor led to this query.
Dinyaar Ji in bbay where can I get it. I wish to protect my equipment rather than keep it testing against high voltage.
Any where in Pune servo stabilizers are available?
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Old 6th May 2009, 02:51 PM
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Re: Voltage fluctuation caused power supply failure

As per my understanding none of the stabilizer can handle a sudden dip or hike in voltage (within the cutoff limit) because of the fluctuation detection and correction time delay. It will be passed on to the connected equipments till it crosses the cutoff limit or it will be rectified within the correction time. Compared to normal stabilizers, servo will provide a smooth voltage correction. Normal stabs handles this by increasing the voltage to some fixed 30/40 volts when it is crossing the voltage correction range (usually is +/- 20-40v from the calibrated o/p, unlike 2-3v in servo). So better choose a servo and from reputed brands coz' the voltage sensors and the quality of the servo motor matters a lot.
"Am surprised that the Yamaha service centre guy told u that the stab can only offer about 50 % protection.", correct with normal stabilizers because of the sudden voltage corrections of 30-40v.
Correct me if i am wrong.
I am using Vertex servo 3Kva with RF/EMI filters and spike protection (11500/- under special disc.).
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Old 6th May 2009, 03:25 PM
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Re: Voltage fluctuation caused power supply failure

Quote:
Originally Posted by vivekam View Post
Can you please guide me from where can I get servo stabilizer in Pune. Also it would be great if I get to know approx. price.

Thanks,
Vivekam.
Hi Vivakam,
I am finally getting 3 KVA Krykard servo stabiliser with RF/EMI Filter and spike suppressor directly from Chennai for about 13.5K. It is currently in transport, should reach my home around next weekend. If you read some old threads, you will know about this Krykard brand, it is equal or better than the Vertex. Another good brand is Aplab for servo, their factory is in Thane. Based on my information, the transformer in Krykard is something special which others may not have.

Krykard has a selling office in Pune. All you have to do is contact them and pay directly to them and they will deliver the product.

Our forum member SuhasG who lives also in Pune and an Electrical Enginner by training and profession owns a 3 KVA Krykard stabiliser and he bought it exactly the way I have described above. Please contact him to know the address and phone no of this place in Pune.

Before I made my decision, I did contact him by sending him a PM. The only problem in my case was that Krykard does not have an office in Kolkata, they only have one service person here, so I myself had to get it directly from Chennai.
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Old 6th May 2009, 03:28 PM
 
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Re: Voltage fluctuation caused power supply failure

no more worries ..no more sepnding 12k... 13k for me ..

i use a protector rated 6AMPS made by su-kam
[does not regulate the voltage,it is a voltage and freq. window protector]
it has
-60 sec Time delay relay,upon switching on ,during this it checks for line condition
-It will protect the equipments from bad power quality like under voltage, over voltage, Frequency variation, surges, spikes, sparks due to loose connections and short power interruptions
-It has very fast response time of typical 15-20 millisecond to cut off the equipment from the bad
quality power
-allows only 190 -230v
>>> SU-KAM <<< Leading manufacturer of Power Products in India, Only Power back up company manufacturing world class UPS, Home UPS, Online UPS, Inverters, Batteries, Battery Chargers, Solar Products
costs 350Rs hehe ..now some people will express serious doubts ..for me it worked very well so far


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