| Optical fiber composite low-voltage cable (OPLC) which is the main carrier ofthe integration of the four kinds of networks plays an important role in homeautomation, office automation, digital substation, industrial network datatransmission in the future. OPLC is increasingly being used in power industry. Atpresent, temperature distribution and optical transmission loss of OPLC underabnormal operating state is wished to be studied further.Short-circuit or lightningwill cause current on conductor of OPLC over several times of its current rated. As aresult, huge economic losses are inevitable by the interrupt of power and fibercommunications.COMSOL software is used to simulate the cable in both steady-state and short-circuit fault state. Temperature distributions and optical transmission loss of theOPLC in the two states mentioned above were showed in the simulation.Temperature curve of the feature points showed that the temperature of the innerinsulating sheath layer increases obviously while the temperature of the outer sheathdoes not change significantly. The temperature of optical fiber within5seconds onlyhas a small increase in the magnitude of about0.2degrees, the displacement causedby thermal expansion only21.247nm and21.902nm, so that the transmission loss ofthe optical fiber in both states almost the same. After simulated other structures ofthe OPLC model we found that the temperature curve of the feature points aresimilar with the former model. That proved temperature trends did not have asignificant effect in different OPLC model.In the following short-circuit test, a test program is presented in accordance withthe test requirements to test the temperature and transmission loss. A simulationmodel is developed according to the actual situation of test. Comparison of thesimulated data and the experimental data we found that the experimental data lags the simulated data for five seconds, but the basic consistency of trend shows thecorrectness of the simulation model. |
PDF Full Text Request