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运行中交变电场在海底光纤复合电缆的光单元金属护套上会产生感应电势,感应电势的大小是决定海底光纤复合电缆内采用何种光单元结构的一个主要因素。给出了金属护套光单元感应电势的计算公式,并举例计算了感应电势及感应电流。计算结果表明,一般长度的海底光纤复合电缆中金属护套光单元的感应电势较小,在安全范围内;具有径向和纵向阻水的普通金属护套光单元可用于海底光纤复合电缆中,不需要采取特殊措施。
In operation, the alternating electric field will generate the induced potential on the light unit metal sheath of the submarine optical fiber composite cable. The induced potential is a major factor that determines the structure of the light unit adopted in the submarine optical fiber composite cable. The formula of the induced potential of the metal sheathing unit is given, and the induced potential and the induced current are given as examples. The calculation results show that the induced potential of the metal sheathing optical unit in the submarine optical fiber composite cable with a normal length is small and within the safe range; the ordinary metal sheathing optical unit with radial and longitudinal water blocking can be used in the submarine optical fiber composite cable, No special measures need to be taken.