Tuesday, 2 July 2019

What is Sag and Span ???

What is Sag and Span

The conductors of a transmission, LT or HT lines are hung on insulators which are suspended from the steel towers or Pole.

In order to permit safe tension in the conductors, they are not fully stretched but are allowed to have a dip or sag.

(01). The horizontal distance between consecutive supports of an Overhead line is called span.

(02). The vertical distance between the straight line joining the points of consecutive supports and the lowest point of the conductor is called sag. The tighter the wire, the smaller is the sag and vice-versa.

(03). The minimum height of the conductor of an Overhead line from the ground is called ground clearance. There should be proper ground clearance for safe operation of the line.

Factors upon which the Sag depends

(01). Tension in the Conductor

(02). Weight of the conductor

(03). Wind and ice loading

(04). Temperature

(05). Span lenght

Factors upon which span depends

(01). Voltage of the line.

(02). Size of the line Conductor

(03). Ground clearance required

(04). Local conditions such as wind pressure, ice loading, temperature etc.

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