X                               X                                                                               X                        Y                                Y                                                                               Y                        Z                                Z                                                                               Z
m (T) Pole Height                                (S) m                                                                                    (T) m

* The height of the conductor closest to the ground is taken as the pole height.

*1 and 3 number Pole Tension (end pole), 2 nolu direk suspension (carrier) Pole.

1-f_min > X_proje No Up Lift.            2- f_min < X_proje there is Up Lift.      3- f_min - X_proje ≈ 0  Can Open Lines.

f_min=P₀.4.a₁.a₂/(8.T₀) =

x_proje=(a₂.h₁+a₁.h₂)/(a₁+a₂) =

f_min-x_proje= 0

Result:  fmin ≈ xproje Can Open Lines(Because it is possible for the conductor to come into contact with the cross arms.)

1-When the height of pole number 2 is taken as 18 m, there is no up lift on pole number 2.

2-When the height of pole number 2 is taken as 14 m, there is an up lift on pole number 2. The pole length should be increased or pole number 2 should be a tension pole(end pole).The height of the poles to the right and left of the carrier(suspension)  pole should be shortened if it is possible, or the pole before the carrier pole can be moved further to the left, if it is possible, and the pole after the carrier(suspension) pole can be moved further to the right, if it is possible, and thus saved from the Up Lift.

3-When the height of pole number 2 is taken as 15 m  Can Open Lines(Because it is possible for the conductor to come into contact with the cross arms.)
   

Summary:

In Over Head Line projects, f_min curve is used to check whether the carrier(Suspension) poles are exposed to Up Lift. If the f_min curve remains above the suspension point of the conductor, it is directly exposed to Up Lift. Sometimes the f_min curve may be very close to this point. In this case, it should be checked by calculation method whether the carrier (Suspension) pole under control is exposed to Up Lift.

In this program, these calculations are made based on x, y, z coordinate values and pole Height. The program produces 3 results.

1-If  f_min > x_project, No Up Lift.
2- If f_min < x_project, there is Uplift. The carrier (suspension) pole length should be increased or chosen as a stopper(end pole). The height of the poles to the right and left of the carrier pole should be shortened if possible, or the pole before the carrier pole can be moved further to the left, if it is possible, and the pole after the carrier(suspension) pole can be moved further to the right, if it is possible, and thus saved from the Up Lift.
3- f_min - x_project≈ 0 Can Open Lines(Because it is possible for the conductor to come into contact with the cross arms.)
Even if there is no Up Lift, there is a possibility that the line may open due to the possibility of the conductor being short-circuited to the cross arms.