×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

MVAr control

MVAr control

MVAr control

(OP)
Due to new regulations from the Danish transmission accountable (400 / 150 kV), we in the distribution (60 / 10 / 0,4 kV) companies have to ensure that the reactive flow thou the 150 / 60 kV transformer is within defined MVAr limits.

The one side of the problem will resolve it selves, when the consumption of reactive power at 60 kV / 10 kV is above the limits. The consumption of reactive power will be reduced because many overhead lines are exchange with cable. And the cable produced the reactive power that is consumed.   

The main problem to operate the MVAr flow within this limit is that we on the 60 / 10 kV voltage level produce too much reactive power. The production of reactive power is 60 kV / 10 kV cable and small combined electric/heat plants (2 MW-100 MW).



So to my question dose some of you have experience with consuming reactive power 20 –30 MVAr at 60 kV?

My idea is to install a reactor with controllable MVAr rating at 60 kV level.  The controllable part of the reactor could be variable air gab or a thyristor controlled reactor.

Another idea for consuming reactive power is to use to parallel transformers with unequal tap settings this will produce a circulating current between windings of the parallel transformers and hens absorb reactive power.

RE: MVAr control

Is the problem with the 60/10 kV systems having a leading power factor (producing reactive power)?  This is the opposite of the normal situation in the US, where transmission companies are worried about lagging power factor loads that cause voltage regulation problems.

RE: MVAr control

(OP)
Yes the problem is leading power factor. Due to 10 kV and 60 kV cable. There is also voltage regulation problem, the problem is that the voltage rises to much.
Therefore we have to reduce the production of reactive power or consume some reactive power.

I have heard that i Germany the have similar restriction on the MVAr exchange between transmission and distribution voltage level

So the question is dose any one have any experience by using (consuming) MVAr at 60 kV level ?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources