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Old 10-18-2012, 11:35 AM   #16
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3 Blown Transformers


Did the power just go off suddenly and stay off?

Or did it come back on for several seconds and go off again and perhaps repeat that a few times?

Often they can tell whether a tranformer fuse blew due to an overload or due to a short (the latter often caused by a tree branch or a squirrel).

The power company does not want to burn transformers out.

Sometimes everything looks normal when the power company inpects the line but it is possibe for a tree a little ways away to bow down and touch the line and short things out.
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The average homeowner who lost his house in the Oklahoma tornadoes should move for good and not rebuild. Too much complexity watchdogging the contractor. Too much a chance to be defrauded.
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Old 10-18-2012, 09:45 PM   #17
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I have a meeting scheduled with an engineer tomorrow morning. Someone called me back this afternoon in reference to my last call with them.

They want to go inside with me and "simulate the conditions of a peak usage period."

Is this reasonable?
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Old 10-19-2012, 04:08 AM   #18
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If it leads to a more reliable supply,
Sure why not !
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Old 10-19-2012, 10:15 AM   #19
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Okay. I met with the engineer this morning.

I turned the broilers on in the two ovens, the cooktop, both dryers, a bunch of the room heaters, tons of lights, and ran hot water to get the heaters to turn on.

She took measurements outside and told me that we are drawing about 4x what they had been expecting.

We are getting a substantial credit on our bill next month and she said there will be infrastructure upgrades occurring within the next week.

One thing I found interesting... Our heating/cooling system (while being controlled on a per room level) cannot be set so that all rooms are heating or cooling at the same time. It is computer controlled with an upper limit on how much power it can draw at once.
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Old 10-19-2012, 10:43 AM   #20
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Sounds like progress to me.
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Old 10-19-2012, 10:52 AM   #21
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Quote:
Originally Posted by michaelson View Post
...One thing I found interesting... Our heating/cooling system (while being controlled on a per room level) cannot be set so that all rooms are heating or cooling at the same time. It is computer controlled with an upper limit on how much power it can draw at once.
Something interesting... Charges and billing for electric use is not all the same for everyone. And not even the same for one home necessarily!

For a home, they may charge one rate for electricity used up to a certain basic amount, then charge a different rate for electricity used in the same month beyond that. And they may have a separate meter for electric water heaters and have yet a different rate for that, or estimate that into the basic rate charges when using just one electric meter.

Then business and industrial users have special electric meters which not only record how much electricity is used, but how much electricity is used at any one time...

...Thus for those customers, it is to their advantage to have energy management systems (such as your air conditioning system) which prevents a lot of electricity from being used at any one time.

And farms may be billed a different rate for crop water wells.

Large industrial users of electricity may get a special rate if they agree to shut down their electric use during times of excessive peak electric use (like very hot day in the middle of summer).

Also there is a "Time of Use" electric meter where the customer is charged less for electricity used during "off peak" times. (Like middle of night.)
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Old 10-19-2012, 11:38 AM   #22
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Originally Posted by michaelson View Post
One thing I found interesting... Our heating/cooling system (while being controlled on a per room level) cannot be set so that all rooms are heating or cooling at the same time. It is computer controlled with an upper limit on how much power it can draw at once.
Also to simply limit the total draw (demand) from the building as a whole.

Let's see. Two broilers at 15 amps each, two water heaters at 20 amps each, two dryers at 20 amps each, stove burners probably 20 amps, now we are up to 130 amps @ 240 volts. Let's say the heating system can draw 50 amps and we also add in some lights and other small stuff. We're up to nearly 200 amps for the building.

Particularly for commercial and industrial customers, power companies have an additional charge called the demand charge, which depends on the maximum power draw at any one time during the month (or any one time each week). Simple demand charge sensors consist of a dial pointer that rises depending on the demand and does not drop. Each time the meter reader comes (typically monthly but could more more often), he resets the demand pointer back to zero manually.
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The average homeowner who lost his house in the Oklahoma tornadoes should move for good and not rebuild. Too much complexity watchdogging the contractor. Too much a chance to be defrauded.

Last edited by AllanJ; 10-19-2012 at 11:46 AM.
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Old 10-19-2012, 11:56 AM   #23
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Was the fraternity house at one time a single family residence? If so, the transformer may have been sized based on SF usage, and not re-sized when the house was converted to fraternity use.
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Old 10-19-2012, 01:38 PM   #24
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We were an office building before we were a frat house, but its been 20 years since then.

Actually the number they got this morning was 220amps at 240volts when she measured. We do have a very complicated billing system. There's different rates by season and by time of day.
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Old 10-19-2012, 03:58 PM   #25
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hey, where are you located? The utility I worked for the consumer service reps were field techs and engineers. what your engineer did is what our cons. serv reps did. Escalation of a problem to a higher level works. just curious, but how many customers on this transformer, just thinking it could be aline fuse going cutting out more than one "tub". The gas station if it is a full service station may be 3 phase, as your building since it was an office.

good going and keep us posted.

bernie
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