| As the main carrier of the integration of the four kinds of networks, Optical fiber compositelow-voltage cable (OPLC) plays an important role in home automation, office automation, digitalsubstation, industrial network data transmission in the future. OPLC is increasingly being used inpower industry. At present, temperature distribution and optical transmission loss of OPLC underabnormal operating state is wished to be studied further.Short-circuit or lightning will cause currenton OPLC’ conductor over several times of its current rated. As a result, huge economic losses areinevitable by the interrupt of power and fiber communications.COMSOL software is used to simulate the cable in both steady-state and short-circuit fault state.Temperature distributions and optical transmission loss of the OPLC in the two states mentionedabove were showed in the simulation. Temperature curve of the feature points showed that thetemperature of the inner insulating sheath layer increases obviously while the temperature of theouter sheath does not change significantly. The temperature of optical fiber within5seconds onlyhas a small increase in the magnitude of about0.2degrees, the displacement caused by thermalexpansion only21.247nm and21.902nm, so that the transmission loss of the optical fiber in bothstates almost the same. After simulated other structures of the OPLC model we found that thetemperature curve of the feature points are similar with the former model. That proved temperaturetrends did not have a significant effect in different OPLC model.In the following short-circuit test, a test program is presented in accordance with the testrequirements to test the temperature and transmission loss. A simulation model is developedaccording to the actual situation of test. Comparison of the simulated data and the experimental data,it showed that the experimental data lags the simulated data for five seconds, but the basicconsistency of trend shows the correctness of the simulation model. |
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