bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - drone uav patrolling for power line crossing and jumper clearance measurement of 400kv double ckt line & 400kv single circuit lines under various tlm offices in srii pac.. drone (uav) patrolling for power line crossing & jumper clearance measurement of 400kv d/c line & 400kv s/c lines under various tlm offices in sr-ii. package-i north tamilnadu” vertical clearance between bottom conductor and ground 2 1 between earth wire/opgw and top condutor(based on tower configuration it can be one/two) 2 2 jumper drops, (cross arm of jumper to the same jumper null point) 6 3 jumper null point to under neath cross arm or tower body(applicable as per tower configuration) 4 0 lower arcing horn at hot end to nearest point of jumper conductor(out of two strings in one phase of any tower, reading with arcing horn of the string whichever is minimum) 6 3 clearance between jumper to main legs of tower(tower body in case of middle conductor in s/c horizontal configuration) total quantity :