Zêdehên Strîkan Yekbûyî

Bundled Conductoran çi ye?

Heqaqêk ji bo transmission lines hewce ne ku yek jî conductor per phase bikin, tu li gorên phase-an de dabeş conductor-an bikin. Yek struktur metalî yên spacer tên dike da ku conductor-an ya phase-ek grup bike. Spacer-an vê şevaxa kontrol dikin û her dem distanda constant yên nîn derbas bide, vêra conductor-an bi xwe na xebitandin û heke parallel binekevin. Her phase de divê du, sê, an çar conductor hene. Wêneyên di navbera dabeş de dê bundled conductors bi spacer-an baran.

Her conductor yên bi spacer yan dike name phase-ek e, û divê sê grûp yên conductor-an hene di transmission single circuit de, an şeş grûp yên conductor-an hene di transmission double circuit de.

Ew configuration yên bikar inin heta ku power zor bir hatine transmite kirin ber bi gavêr ên voltage level.


Niha divê werdîn ku advantages bundled conductors piştguh single conductor.

Avantajên Bundled Conductors

1. Bundling yên conductor-an reline inductance yên line.
   Inductance yên line dike wek heya
   
   Ji bilge GMD = Geometric mean distance
   GMR = Geometric mean radius
   Ji bilge yek conductor yên radius r
   GMR = 0.7788r
   Ji bilge two conductor bundle yên wêneya dêre
   
   

   
   

   Ji bilge three conductor bundle
   
   Ji bilge four conductor bundle
   
   Demekî GMR dike guherandin û L diket. Niha avantajên reline inductance yên line hene, wê:

   
   Ji bilge X = wL …reactance yên line

• Voltage regulation yên line dike guherandin ji bilge reactance yên line diket.

• Power transfer capability yên maximum yên line dike guherandin.

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2. Bi argumentêk sererast reline inductance yên line, dêrin kapin ku capacitance yên line dike guherandin, ji bilge capacitance yên line to neutral dike wek heya
   
   Niha L diket û C guherandin, SIL net yên line heta diket û power transfer capability heta diket. Demekî, bundled conductors bikaranîn rêjimêk e ku SIL, yani Surge Impedance Loading, diket.

3. Her most important advantage of bundled conductors dike corona discharge diket. Ji bilge power hatine transmite kirin bi voltage levelên zor mezin, bi yek conductor, voltage gradient yên navendis dike high, û şansê corona effect pêkhatin – especially bad weather conditions. Bi bilge several conductors nearby instead of one conductor, forming a bundled conductor, voltage gradient diket û şansê corona formation diket.
   Guherandin critical corona voltage depend upon the following-

   
   

   It has been found out that the optimum spacing between the conductors in a group is of the order of 8-10 times the diameter of each conductor, irrespective of the number of conductors in the bundle.

• Number of conductors in the group,

• Clearance between them, and

• The distance between the groups forming separate phases.

4. Diketina corona discharge dike less power loss û improved transmission efficiency yên line.

5. Diketina communication line interference bi bilge diketina corona.

6. Ampacity, yani current carrying capacity yên bundled conductors, dike guherandin bi bilge reduced skin effect.

7. As the bundled conductors have more effective surface area exposed to air, it has better and efficient cooling and hence better performance compared to a single conductor.

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