Consultancy works :

In the aerostat, large number of devices is installed for stabilization of aerostat and collecting various types of information from the ground and sky. These devices need constant voltage power supply, which is supplied through a cable whose length is 1.5 km. Some portion of this cable is wound on the winch drum and some portion is hanging in air. The portion which is wound on the drum generates more heat due to lack of heat dissipation. Due to this the resistance increases and adversely affects the insulation of cable. Under different loading conditions at the aerostat the voltage drop varies considerably. Some of these devices are highly voltage sensitive and hence by switching on other devices may cause problem. Hence, under heavy loading conditions at the aerostat the voltage drop in the power cable is also considerably high. It needs some automatic control to maintain the constant voltage at the aerostat end. Objective is to maintain the desired voltage at the aerostat to operate various devices under different loading conditions.