307 / 2022-03-15 11:14:34

Experimental study on high temperature resistance of stranded carbon fiber composite core conductor

high temperature,carbon fiber composite core conductors,laboratory test

Purpose/Aim

Compared with the steel core aluminum stranded conductor, the carbon fiber composite core conductor has the characteristics of high temperature resistance, and the conductor can operate at a temperature not lower than 160 ℃ for a long time, depending on the glass transition temperature (Tg) of the carbon fiber composite resin material (such as not lower than 190 ℃ ). Under extreme conditions, carbon fiber composite core conductors also do not allow long-term operation above the glass transition temperature. Therefore, it is necessary to study the temperature rise of the carbon fiber composite core conductor under some special operating conditions, such as the heating of the strain clamp and the short circuit grounding. The research results help to understand the safe operation performance of the new conductor.

Experimental/Modeling methods

Taking the stranded carbon fiber composite core conductor as the test object, the glass transition temperature (Tg) of carbon fiber composite core resin material was obtained by DMA test method. Carry out high-temperature continuous load test under long-term allowable service temperature for conductor type JLRX1/JF1B-300/40, with test temperature of 160 ℃, heating time of 168h and tension of 15% RTS applied. After the test, tensile force test is carried out. Continuously heat the aluminum tube of the tension clamp under 300 ℃ and 136h, installed at 25% RTS. The high-temperature tensile strength is measured after the test. The short-circuit current test with 22.3kA (2s, RMS) is carried out, installed at 20% RTS. The temperature rise of the conductor is Monitored and tensile strength of the conductor is obtained after the test.

Results/discussion

The glass transition temperature of the carbon fibre composite core epoxy resin obtained from the test is above 190 ℃, so the long term operating temperature is generally no less than 160 ℃. Through upon high temperature continuous load tests on the carbon fibre composite core conductor, the tensile strength  obtained is 106.6kN (105.1% RTS), 92.68kN (91.4% RTS) and 99.22kN (97.8% RTS) respectively.

Conclusions

The tests are designed and carried out on the long term temperature of stranded carbon fibre composite core, the thermal performance of tension resistant conductor under heat and short-circuit current conditions. The ability of the epoxy resin system is considered to be used to withstand long term service temperatures (160 ℃) and short time high temperatures (190 ℃).