Sag & Tension in transmission lineToday we are going to learn a topic called sag and tension in the transmission lines.During the erection of overhead transmission line, the conductors are connected between two tower structures. The conductors connected between the tower structures must not be connected too tight or too loose. If they are connected very tightly, the tension on the conductor will be very high and at some point it may break. If they are connected very loose, the charging current increases the length of wire to be used and the height of the tower structure increases. Hence, the conductors must be connected in such a way that the tension is minimum and at the same time there should be good clearance between the ground and the conductor.
Definition of Sag In Transmission Lines
Sag can be defined as "The difference in level between the points of supports and the lowest point on the conductor is known as sag"
Factors Affecting SagThe various factors which effects sag are,
(i) Weight of conductor.
(ii) Location of conductor.
(iii) Length of span.
(v) Tensile strength.
Here we discuss briefly about various factors sag & tension in electrical transmission lines .
(i) Weight of conductor
Calculation of Sag in Overhead transmission lines:
w = Weight per unit length of conductor
T = Tension in the conductor.
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