Motor Voltage Drop at Starting time

Hi,

We're having a problem with a motor that has a big voltage drop (around 18%) only at the starting time. It's a 800HP motor that works with 99A and 4000V. A mechanical check has already been done on it, and everything looks fine, so the proble is related to power distribution I believe.

Any ideas?

Thank you

Motors

asked 7/29/2013
jcdelao4
jcdelao
  • It looks like the cables and switchgear are ok because the problem is only at the starting time, or what do you excatly mean by this?

    We are know doing some calculations in order to check if our current transformer is goof enough to supply our motors. Do you know how to do this?


    Tahnk you
    - jcdelao 8/5/2013

1 Answer

This answer has been selected by the question author as the best answer.

Has the voltage drop calculation been validated before ordering of cables and switchgear? Particularly for high inertia motors, you will have to factor in this input. 

Secondly your power source could be weak which is not able to support the high capacity motor starting current.

Please check and revert.

answered 7/31/2013 Pattabhiraman 74
Pattabhiraman

Your Answer

In order to provide an answer to this question, you must Login

I am flagging this question because...




10 inform moderator flags remaining

I am deleting this question because...




I am flagging this answer because...




10 inform moderator flags remaining

Flagging a Post

You have already flagged this post. Clicking "Remove Flag" below will remove your flag, thus reducing the count by one as well.

I am deleting this answer because...





GE's Shingijutsu Factory

GE's latest thinking on product manufacturing is he Shingijutsu philosophy or Lean production system. They have started applying this at the Louisville...

Induction Motor Calculator

Just added a page to the tools, which will allow you to calculate the synchronous speed, slip and rated torque for an induction motor. Not a particularly...

Control Theory

Control theory looks at how systems work and are controlled from a mathematical view.  This note gives a brief introduction to some of the concepts – more...

Are We Losing Professional Integrity

I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...

LED Replacement Light Bulb

The inventor of the first visible light-emitting diode makes history again this year as it begins to show customers a 40-watt replacement GE Energy Smart...

Electromagnetic Fields - Exposure Limits

Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences.  A lot of research has been conducted...

Cost Performance and Time

Often us engineers get so bogged down in equations, using software, producing drawings and writing specifications that this becomes the sole focus.   ...

Welcome back Bottle

‘Kept looking at a card, y’see? Kept looking at it. Welcome back Bottle. Gods below welcome home. The Crippled God A Tale of the Malazan Book of the...

How to measure power supply quality

If your are ever called out to troubleshoot something on your electrical system, one of the first things consider is the supply voltage. You want to ensure...

Motor Insulation

Insulation on a motor prevents interconnection of windings and the winding to earth.  When looking at motors, it is important to understand how the insulation...

Our website uses cookies so that we can provide a better experience.
To learn more about what cookies are and how to manage them visit AboutCookies.org