ELECTRIC FIELD MEASURING INSTRUMENT FOR HIGH VOLTAGE EQUIPMENT

摘要

PURPOSE:To secure the safety of an operator and to obtain sufficient resistance to a shock, etc., by fitting liquid crystal on the surface of an insulator constituting a high voltage equipment and detecting variations of the hue, light intensity, etc., of the liquid crystal. CONSTITUTION:A polarizer 4 is fitted on one surface of mixed liquid crystal 3 and an insulating film 5 is fitted on the opposite side; and this liquid crystal is fitted to or nearby a main high voltage equipment body. When no voltage is applied to the high voltage equipment and there is no high electric field, the host liquid crystal 1 and guest liquid crystal 2 are both in free directions, so the liquid crystal applied over the insulator colors in reddish orange which is the mixed color of red and yellow. Here, when a voltage E is applied to the high voltage equipment and the electric field at the insulator part exceeds about 4kV/mm, dye molecules of the guest liquid crystal 2 have long axes arrayed in the electric field direction as molecules of the host liquid crystal 1 are rearrayed, and the high electric field part turns yellow and is clearly discriminated from a low electric field part.