Electrical energy meter errors

  • Thread starter m.s.j
  • Start date
  • #1
215
1
A three phase and three wire energy meter has installed in a medium voltage network with a lot of third harmonic current and unbalanced load (approximately %10). As you know, any distortion in sine wave and deviation of rated frequency in AC electrical system may be cause the increasing of measuring errors.
According to a common technical practice, the third harmonic of measuring current can be trapped by using of suitable interposing current transformer with star-delta connection. This recommendation applied in above mentioned system and accuracy of measuring system improved, but the system was not disencumbered of third harmonic nuisance completely.

How can you explain the reason of nuisance continuity?

BEST REGARDS
MSJ


----------------------------------------------
Creative thinking is enjoyable,Then think about your surrounding things and other thought products. http://electrical-riddles.com
 

Attachments

  • 46.GIF
    46.GIF
    1.8 KB · Views: 468

Answers and Replies

  • #2
anorlunda
Staff Emeritus
Insights Author
10,088
7,251
Ideal devices such as transformers can do things that real life devices can't.

My guess is that saturation in the transformer core is what allows harmonics to pass.
 

Related Threads on Electrical energy meter errors

Replies
7
Views
875
  • Last Post
Replies
16
Views
5K
Replies
1
Views
2K
Replies
7
Views
4K
  • Last Post
Replies
10
Views
4K
Replies
8
Views
3K
Replies
10
Views
973
Replies
4
Views
3K
Replies
7
Views
3K
  • Last Post
Replies
9
Views
3K
Top