Since the transmission line tower has large gap

is easy for nesting

is strong and stable

causing such ac-cidents as flashover

short circuit and tripping due to bird nest and bird droppings to increase year by year

which pos-es a serious threat to the safe operation of power grid. In this paper

a kind of new

safe and effective"bird on line"monitoring technology is proposed. A kind of current transformer which is suitable for gaining energy from 50 Hz ACtransmission line is designed.The purpose of achieving load power of current transformer with maximum energy acqui-sition at low line current condition is achieved by way of optimizing the matching of the secondary winding turn andimpedance

so to provide the possibility for the deployment of sensors that can supply power by itself and detect on-line birds in real time.It is shown by the experimental result that the device can output power of 9.5 m W at line cur-rent of 1.54 A

which makes it possible for the sensor to supply power by itself and monitor the bird in real time.The de-vice strictly follows the electromagnetic compatibility and low power design and does not interfere with other equip-ment.It not only reduces the management and operation costs of company

saves a lot of labor and maintenance costs

but also improves the reliability and economy of substation operation as well as ensures the safe operation of power grid.