Capacity indicator and load measuring system for aerial devices

New working techniques on the distribution network, such as transformer lifting and installation, are increasing the need to maximize the capability of aerial devices. Hydro-Quebec's research institute, IREQ, thus developed the Capacity Indicator and Load Measuring System (CILMS) after three years of R&D efforts aimed at increasing the safety of articulated aerial lifts and validating new work-related methods. The embedded system, located near the bucket, displays the available load capacity and the actual load on the jib. The available capacity is based on the lift geometry. Sensors located on the lower and upper boom and on the jib transmit the angles and length to a microprocessor which processes the information, and then retrieves and displays the capacity in real time. The actual load on the jib is measured at the tip of the jib with a tool interface made up of two load pins. Any load lifted with the jib is calculated in terms of amplitude and angle, after which the amplitude is displayed in real time. Radio communication is used for lower boom angle and load pin measurements to preserve the lift's dielectric insulation. A signal is transmitted to a visual and audible alarm whenever the load exceeds the capacity. If an alarm sounds, the system then records the date and time, the geometry of the lift, and the load. These data are easily read and the operating parameters can be viewed or modified using the pushbuttons on the display unit.