Motor Connection for Submersible Pump

It can be operated at either of two voltage ranges. Ordinarily there is a diagram to show which way to wire it for which voltage you have.

Read the manuals and diagram.

The Star connection is for operating the motor at the higher nameplate rated voltage.

The Delta connection is for operating the motor at the lower nameplate rated voltage.

Be sure the motor leads are configured to match the application's system voltage.

Is there any constructional advantage for delta connection?

Yes. You won't have to replace it very often.

none whatsoever. and it is NEVER done for the reasons I listed previously

JRaef-

Your observations may be on the spot! But I believe those consumer's practices were triggered by a poorly designed infrastructure power distributions. Resulting to the possibility of having a poorly designed power regulation of distributed power in India?

Countries in hot climates, due to their poor economic conditions, the normal tendency for the consumers is to use the higher supply voltages instead of the typical 230 V supply lines. A common practice due to experienced voltage drops along the supply lines.

The normally distributed 230V supply lines can be observed to regularly drop down to as low as 170 Volts, specially during peak usages! A very low level that causes burnt motor windings, and beyond the normally allowable +/- 10% voltage variations acceptable designed equipment operation!

The use of marginally, smaller (AWG) wire sizes with limited # of step down distribution transformers along the distribution lines are the main causes which was done or triggered by poor economic conditions!

Hi Mr Vsar

Do you have any data of cost difference for using 415 V instead of 230 and a comparative statement? will be highly appreciated

" Countries in hot climates, due to their poor economic conditions, the normal tendency for the consumers is to use the higher supply voltages instead of the typical 230 V supply lines."

biswanath.das -

Not for an up to date info...

The comments made were all based from experience encountered while engaged in solving power problems. Both related to power distributions and regulation problems as well as other observed conditions existing at that time in other countries in Asia... which by is now almost 50 years ago!

I liked your post and explanation when running the motor at a low voltage, but set for high.

I do believe that running at the low voltage, but set for high, can cause extra heat/less cooling and possible damage to some motors as well.

Is that your opinion as well? Thanks.

Normally when you place an order mentioning operating voltage and frequency they will supply with tail cable,don't worry about internal connection.

ALL submersible pump motors that I've used, made by numerous manufacturers, ALL have their motors in STAR configuration.

first as the pump usually is loaded even before starting, therefore the maximum amount of starting torque is required, or you get a stall situation, which is not good for the motor

Second and in my field, that is the oil patch, all submersible pumps are required to have a downhole monitoring tool fitted to the bottom of the motor.

A downhole monitoring tool is a 5 channel measuring instrument that will send to the surface, downhole temp, motor running temp, intake and discharge pressure and vibration.

It sends the information to the surface via the motor STAR point and through the power cable to where the data signal is taken off the power cable and displayed as a set of readable values at surface.

Give names of reputed manufacturers of downhole monitoring tool for submersible motor in deep well for water.

www.pumpperiscope.com

It doesn't give any information on motor/water parameters(temperature, vibration, pressure) monitoring

I found it in www.slb.com/schlumberger deep well pumps,but I couldn't find description.

it that a demand or don't you EVER say please?

Sir

you know not what you talk about....

I'll be blunt, and if it offends, then it offends. Your comment is total rubbish and to me it tells me you have NEVER installed submersible pumps. If you had designed, installed and managed submersible pumps, you would understand.

Thank you Mr.brich for your comments.

I do not intend to contradict your statement, on the other hand, may I request you to post proper information so that at least I can (though not others who are not interested to) learn.

It is better to light a candle than curse the dark.

DHAYANANDHAN.S

If you take the time to read ALL the posts, you will see my previous post No6 has ALL the relevant and correct information to explain exactly why submersible pump motors have a STAR connection.

And while I mention my post No6, which MUPPET marked it as "off topic"... to that I will say I now know there are more than one person who doesn't understand submersible pump and motors.

You said and I quote "It is better to light a candle than curse the dark."

I say "open your mouth and prove you are stupid or keep it shut and let everyone think you are"

Dear Mr.brich

you referred,

"open your mouth and prove you are stupid or keep it shut and let everyone think you are"

WHY YOU GET SO OFFENDED.? According to you I HAVE FAILED. OK. Yes, I can pass in the 2nd attempt.

Henceforth I do not intend to drag/reply in this matter. God Bless you.

DHAYANANDHAN.S

Simple really, have you ever seen an ESP, run an ESP in a well, operated or designed an ESP? If you answer no to any or all of my questions then you don't know what you are talking about. As for me being offended... No I'm not. What I am is slightly peeved at people spouting about a subject they know nothing about....

My Friend...

Using 6 core cable at a length of 6000ft or even more is counter-productive. You have never run a submersible pump have you? the OD of many of ESP's is about 5.5 inches, and you want to connect six cores to the motor.

Have you EVER seen a ESP?

Connect it as per the manufacturer specified voltage connections. Simple as that!