OPGW短路电流温升计算原理及应用程序

OPGW具备输电和数据通信双重功能,能更有效地利用现有的电力资产和线路设施。然而,由于OPGW结构中包含有光纤,这就意味着温升限制与传统架空地线有所不同。尤其是在电力线发生短路故障时,短路电流流过地线会造成很高的瞬时温升。再者,OPGW组成部分像金属管、骨架等以前在传统的电力线路上没有用过,这就增加了计算常规短路电流温升的偏差。因此,考虑到OPGW特有的结构特性,古河电工及其合作伙伴专门进行了计算电流温升的研究,并开发出了相应的计算机软件。与OPGW实际的短路电流测试结果对比,计算的精确度在±5%以内。

Calculation principle and application program for temperature rise caused by short-circuit in OPGW

Composite ground wire with optic fiber (OPGW) supports both power transmission and data communication,and makes the use of real estate and line facilities more effectively. However,considering the cable structure of the optical fibers, the limit of temperature rise differs from that of conventional overhead ground wires.Especially in power line ground faults, short-circuit current flowing in the ground wire will result in large instantaneous temperature rises.Furthermore, the elements of OPGW such as metallic tube, framework are not used in power lines previously.This will increase the error in calculating original short-circuit temperature rise.The calculation of the short-circuit temperature rise and the calculating software are developed by authors, take into account the structural features to OPGW.Comparing the results with short-circuit tests to OPGW, we confirm that calculation accuracy is within 5%.