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OPPC (Optical Phase Conductor) is a particular type of electric optical cables which composite the fiber unit into the
structure of traditional phase lines. The special design fully leverages the power system's own line resources and
achieves dual functions of power transmission and communication simultaneously, particularly in the power distribution
networks. Furthermore, Raman optical time domain reflectometry (ROTDR) based distributed temperature sensing
(DTS) system integrates with OPPC, that is to plant a single or several multimode optical fibers into the fiber unit of
OPPC, which can realize the remote, online, continuous measure and location for the conductor’s temperature. This kind
of monitoring system has many advantages such as anti-electromagnetic interference, information sensing and data
transmission unification, long life-cycle, light weight, long transmission distance and non-power supply on site. But
nonetheless, there is still a problem has to been resolved, that is whether the temperature of DTS fiber’s position
represents exactly the one of OPPC’s.
This article takes the section temperature field of 400/50 OPPC as the research object. Based on the temperature data
measured by the Raman distributed temperature optical fiber sensor, a large number of finite element analysis and
experiments are developed. The DTS measurement results under different actual working conditions of current-carrying
capacity, wind velocity and environment temperature are quantitative analyzed. The changing rules and the relationships
among the measurement results of DTS, the maximum and the surface temperatures of OPPC, and the results of
numerical simulations and experiments have been proposed and demonstrated. On the whole, the main contributions of
this paper are: (1) According to the structure of 400/50 OPPC, the Fluid-Structure Interaction (FSI) methodology and the
steady section temperature field model are established which can reveal the OPPC’s temperature profile in multiple
conditions; (2) Optical fiber Raman distributed temperature sensor is applied to measure the inner temperature of
OPPC’s optical unit, and the measurement accuracy can be up to ±1°C; (3) A thorough experimental scheme is
proposed that verified the correctness of the temperature field analysis approach, and also certified that the inner fiber
catheter temperature and the maximum temperature of OPPC are consistent under common working conditions.
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