Sag compensation for temp. resistant conductors - employs spring and lever to maintain tension coupled to high temp. conductor

摘要

The application is principally to conductor installations in substations where steel supported aluminium conductors are used. These permit safe operation at continuous temp. up to 473 deg.K, but have a correspondingly large linear expansion. To permit the use of such cables without closer support spacing, the sag due to expansion is taken up by a spring tensioned lever. A cranked lever (1) is hinged (13) to the transmission mast (3) and attached at one end to the cable (14), and at the other (11) to a coil spring (2). The spring assembly is also attached to the mast. If the sag tends to increase, the load on the pretensioned spring (2) tends to decrease. To equalise the acting forces the lower lever arm is pulled towards the spring, causing the upper arm to stretch the cable thus compensating for the sag.