Patent ID: 8155921

Claim:
A power transmission line dip measurement method comprising: a measurement instrument installation step of installing a measurement instrument at a place where power line support points of two steel towers can be seen from the ground; a first collimation step of collimating the measurement instrument at the power line support point of one of the steel towers; a first transmission step of transmitting a collimated value to a personal digital assistant (PDA) in a wired or wireless manner; a second collimation step of collimating the measurement instrument at the power line support point of the other steel tower; a second transmission step of transmitting a collimated value to the PDA; an angle calculation step of calculating the transmitted collimated values to display a horizontal angle position of a dip base line; and a dip value display step of adjusting an angle of the measurement instrument based on the horizontal angle displayed on a screen of the PDA by a worker, collimating the measurement instrument at a power line dip point as a dip base point, and displaying a dip value on the screen of the PDA.