| 摘要 |
<p>A proximity differential control for use with construction equipment and sepcifically cranes operating in the near proximity to an energized electrical power line comprises a reference antenna positioned at substantially the closest desired distance of operation from an electrical power line, at least one substantially identical sensing antenna positioned on the movable equipment, substantially identical receiving and amplifying means for each of the said antennas, and control means for comparing the relative strength of electrical fields around each of the antennas, and for shutting down the movable equipment when one of the sensing antennas moves into an area having a greater electrical field strength than that of the reference antenna.</p> |
