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ELECTRICITY DISTRIBUTION

HV&LV VOLTAGE JOINT CONDUCTOR OVER HEAD LINE TENSION CALCULATION

HV&LV  Tension C.

HV&LV Common Pole Selection

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Turkey is divided into four ice load regions in terms of low voltage. 4.zone (very few regions) extremely harsh condition. Calculations are given separately for the four ice loads given here. HV&LV Common Pole Selection.

 Outside Diameter                              = d (mm)   5,88
 Cross-Section                                     = S (mm2)   21,14
 Conductor Unit Weighteight              = P0 (kg/m)   0,0578
 Rated Tensile Strength                      = Tk (kg)   403
Initial Modulus of Elasticity               = Ei (kg/mm2)   5343
 Final Modulus of Elasticity                = Es (kg/mm2)   6220
 Coefficient of Thermal Expansion     =  β (1/0C)   0,000023 
 Maximum Tension                             = σm (kg/mm2)   7                              (Galvanized steel pole 1.Zone : 7          )
 Total Maximum Tension                   = Tm (kg)   147,98                     (Galvanized steel pole 1.Zone :  147,98         )
 1.Bölge  2.Bölge  3.Bölge  4.Bölge  
 One Ice Zone Load                            = k√d = Pb (kg/m)  0,485  0,7275  1,2124  
 With One Ice Zone Load Weight      = P1=P0+Pb  (kg/m)  0,5428  0,7853  1,2702  
 Two Ice Zone Load                            = 2.k√d = 2.Pb (kg/m)  0,97  1,455  2,4248  
With Two Ice Zone Load Weight      = Pn=P0+2.Pb  (kg/m)  1,0278  1,5128  2,4826  
 Average Span Length                       = aort (m)   50 50   50   50  
 Critical Span Length                         = akr (m)   43,37   20,37   19,85   13,7  
  Maximum Temparature                   = tmax (0C)   +50  +45   +40   +40  
 Minimum Temparature                     = tmin (0C)   -10   -15   -25   -30  
Critical Temparature                         = tkr (0C)  44,98   38,72   40,33   41,7  
 Maximum Design Tension                  +5 0C + % 100 Wind   - 5 0C + % 100 Ice
  Maximum Sag   +50 0C   +45 0C   +40 0C  +40 0C  
  Wind Load                                   = Pw  = c.q.f (kg/m)   0,3105
 √[(%100.Pw)2+P0 2]                  = Pn  (kg/m)   0,3158
√[(%70.Pw)2+P0 2]                     = Pn  (kg/m)   0,2249
√[(%42.Pw)2+P0 2]                     = Pn  (kg/m)   0,1426
 %100 Ice and Wind Load           = Pbw  = c.q.f (kg/m)   0,6209
 %200 Ice and Wind Load           = Pbw200  = c.q.f (kg/m)   0,7762
 √[(Pbw100)2+(P0 +Pb)2]     = Pnw  (kg/m) (%100  ice+wind)     0,8247  1,0011  1,4138  
 √[(Pbw200)2+(P0 +Pb)2]     = Pnw  (kg/m) (%200  ice+wind)     1,288  1,7003  2,6011  

 

  

*Wind load is not taken into account in High Voltage Electricity Distribution Overhead Line calculations when the conductor wire is icy. It is obvious that wind will blow even in icy conditions. Here, with Pbw, 100% wind is applied to the conductor.
The force was calculated assuming a load. The total load on the conductor was calculated using Pnw. Especially in places where winter conditions are harsh, pole collapses are
This force must be taken into account in order to prevent it.
**Critical Temparature tkr (0C) :Since the distribution of poles on the land should be made according to the situation where the maximum sag will occur, the maximum sag is; It is necessary to calculate whether it will occur at maximum temperature or under additional load.There is a temperature that gives a sag equal to the sag in the icy state, and this temperature is called the critical temperature.

***Critical Span Length akr (m):In power distribution lines, maximum tension occurs either under additional load or at minimum ambient temperature. There is a span that separates these two situations where maximum tension occurs, and this span is called the critical span.

 

****The tension values ​​in the table below are taken from TEDAŞ publications. These values ​​are recalculated and given on the  CONDUCTOR TRACTION CALCULATIONS page. The accuracy of these values ​​can be checked from the safety distance calculations.

  1.Zone 2.Zone 3.Zone  4.Zone
Conductor Tension(Rose) :  70  100  147  148
         
%100 Ice and no wind Tension  (Rose) : 1.Zone 2.Zone 3.Zone 4.Zone

1 m:

  0,3105  0,5428  0,7853  1,2702

40 m:

  12,42  21,712  31,412  50,808

50 m:

  15,525  27,14  39,265  63,51

60 m:

  18,63  32,568  47,118  76,212
         
   1m   40 m  50 m   60 m
Wind Load (Rose) :  0,3105  12,42   15,5  18,63
%100 in icy condition wind load Tension(Rose) :  0,6209  24,836  31,045  37,254
%200 in icy condition wind load Tension (Rose) :   0,7762  31,048  38,81  46,572
         
%100 Ice and Wind Total Load  Tension  (Rose) : 1.Zone 2.Zone 3.Zone  4.Zone
1m:    0,8247  1,0011  1,4138
40m:    32,988  40,044  56,552
50m:    41,235  50,055  70,69
60m:    49,482  60,066  84,828
%200 Ice and Wind load total Tension  (Rose) : 1.Zone 2.Zone 3.Zone  4.Zone
1m:    1,288  1,7003  2,6011
40m:    51,52  68,012  104,044
50m:    64,4  85,015  130,055
60m:    77,28  102,018  156,066