Power fluctuations - electric supply

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Power fluctuations - electric supply

Post by Name Taken » Wed Mar 08, 2017 8:30 am

Does anyone else get fluctuations in their electrical power supply? Sometimes my air conditioner does a 'surging effect' during the day or evening but it doesn't do it all the time.
I'm also wondering if the electrical power fluctuations could be what is causing my water pump to shut down sometimes, it's either the electrical power fluctuations or harmonics that is causing my water pump to shut down sometimes.

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Re: Power fluctuations - electric supply

Post by buksida » Wed Mar 08, 2017 8:53 am

Yes, almost a daily occurrence where we live (not in Hua Hin). Very little you can do aside from hope the electric dept upgrade the transformers and supply and get a decent UPS for your computer.
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Re: Power fluctuations - electric supply

Post by Jesse » Wed Mar 08, 2017 9:02 am

I don't know the answer to your question but the first thing I would check is the size of the electric wiring to your air conditioner. My experience is that even professional aircon installers take shortcuts and try to either reuse or install wiring that is too small per the manufacturers minimum recommended specifications. I'd check the wiring from the breaker box to the aircon and have it replaced with at least size #4 wires if it's not already.

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Re: Power fluctuations - electric supply

Post by Nereus » Wed Mar 08, 2017 9:47 am

I'd check the wiring from the breaker box to the aircon and have it replaced with at least size #4 wires if it's not already.
Cable sizes in Thailand are metric. A #4 SWG cable is around 27mm2, and has an ampacity of about 95 amps, probably about 6 times the size of the main supply cable. 4mm2 is more than enough for most domestic air cons.

But regardless of the conductor size it is not the cause of "surging". As Buksida has posted it is more likely an inadequate sized street transformer, along with overloaded and undersize street cables leading to large voltage drops on the supply. As it is not consistent, it is probably related to some other load on the system starting up. Not a great deal that you can do about it except complain to the supply authority.(PEA) If you can gather up enough complaints from neighbours they MAY do something about it, but unlikely.

As the voltage supply drops, the current(amps) increases, which will either trip an overload device, or just plain damage the equipment, and in the case of motors could eventually cause it to burn out.
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Re: Power fluctuations - electric supply

Post by Big Boy » Wed Mar 08, 2017 10:29 am

Our power fluctuates all the time. So far in 5 years we've only lost one piece of electrical equipment, and that was a Canon Printer (not expensive). Worries me a lot though.

If the brightness of the lights is anything to go by, I'd guess we drop to well under 50% power.
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Re: Power fluctuations - electric supply

Post by StevePIraq » Wed Mar 08, 2017 12:59 pm

You could look at installing a voltage regulator or stabilizer (not UPS) for your home. I do not know where these can be purchased around HH but they must be available. I installed a very large one overseas where we had tremendous fluctuations in the power supply, this kept a 7 story building with 35 air cons, lights, water heaters etc. pretty stable. or you could install one on just specific circuits of your house.
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Re: Power fluctuations - electric supply

Post by Name Taken » Thu Mar 09, 2017 8:59 am

Jesse wrote:
Wed Mar 08, 2017 9:02 am
I don't know the answer to your question but the first thing I would check is the size of the electric wiring to your air conditioner. My experience is that even professional aircon installers take shortcuts and try to either reuse or install wiring that is too small per the manufacturers minimum recommended specifications. I'd check the wiring from the breaker box to the aircon and have it replaced with at least size #4 wires if it's not already.
The person that installed our air conditioner did a very professional job, and the lights also dim slightly sometimes when the electrical power fluctuates. So I am certain that it's not the air conditioner wiring.

Thanks for the replies.
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Re: Power fluctuations - electric supply

Post by Name Taken » Mon Mar 27, 2017 6:17 pm

A follow-up to the water pump issue.
It has taken me about one and a half months(50 days) to figure out what the water pump issue was.
It was not the electrical power and not the electrical outlet and it was not harmonics.
The issue with the water pump was that the electrical motor inside the pump housing was overheating and the water pump would shutdown and then turn back on after about 5-10 minutes, the electric motor inside the water pump housing was also heavily corroded.
The water pump was a Mitsubishi water pump, and I have replaced it with a Hitachi water pump.
The Hitachi water pump has outside vents exactly where the electric motor is inside the water pump housing and the electric motor on the Hitachi water pump has an anti-corrosive coating so it should be good to go.
The Mitsubishi water pump lasted for 5 years(it has a 5 year warranty) and it was only used for 6-7 months out of those 5 years, so that means that it lasted 6-7 months not 5 years.

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