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十堰二汽地区电话电缆是采用铅包纸绝缘40对(或150对)单铜芯通讯电缆。架空使用过程中,由于竹蜂咬破及其它原因造成外包铅皮机械损伤而呈现小穴,水份或潮气沿小穴浸入电缆内部,其绝缘电阻急剧下降,造成“虚障碍点”影响通话。尤其是霉雨季节,出现大面积电话障碍。原来寻找“虚障碍点”是依靠维修人员配合蜂鸣器,爬竹梯,在数公里范围内无目标地寻找。找一个点往往需要一天甚至数天,既费力又费时。一九七六年初,三结合设
Shiyan two steam regional telephone cable is the use of lead paper insulation 40 pairs (or 150 pairs) single copper core communication cable. Overhead use, due to bamboo bee bites and other causes outsourcing lead mechanical damage and presented small holes, moisture or moisture along the hole immersed in the cable inside the insulation resistance dropped sharply, resulting in “virtual obstacles” affect the call. Especially in the moldy rainy season, a large area of telephone trouble appears. The original search for “virtual obstacles” rely on the maintenance staff with buzzer, climb the bamboo ladder, within a few kilometers without target to find. Finding a point often takes a day or even days, both laborious and time-consuming. In early 1976, three combined set