海底光纤复合电缆金属护套光单元感应电势计算

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。

Calculation of Induced Voltage in Metallic-Sheath Optical Fiber Unit of Submarine Optical--Electric Composite Cable

In metallic sheath optical fiber unit of a submarine optical--electric composite cable, induced voltage will he generated because of the influence of AC electric field when the cable is in operation. The magnitude of the induced voltage is one of the major factors to determine the construction of an optical fiber unit in a submarine optical--electric composite cable. The calculation formula for induced voltage in an metallic sheath optical fiber unit is presented; and the values of induced voltage and induced current are calculated as an example. The calculation result shows that the value of induced voltage in a metallic sheath optical fiber unit with common length is small and within safe range. And common metallic sheath optical fiber unit with radial and longitudinal water-blocking can be used in submarine optical--electric composite cables, needless any special protection measures.