The load varies periodically, but the peak current of
power cable is controlled by its continuous ampacity in China, resulting in the
highest conductor temperature is much lower than90℃,
the permitted long-term working temperature of XLPE. If the cable load is
controlled by its cyclic ampacity, the cable transmission capacity could be
used sufficiently. To study the 10 kV XLPE cable cyclic ampacity and its factor, a
three-core cable cyclic ampacity calculation software is developed and the
cyclic ampacity experiments of direct buried cable are undertaken in this
paper. Experiments and research shows that the software calculation is correct
and the circuit numbers and daily load factor have an important impact on the
cyclic ampacity factor. The cyclic ampacity factor of 0.7 daily load factor is
1.20, which means the peak current is the 1.2 times of continuous ampacity. If
the continuous ampacity is instead by the cyclic ampacity to control the cable
load, the transmission capacity of the cable can be improved greatly without
additional investment.
[1]
Zheng Yan-ling.
The calculation of the steady-state temperature field and rated ampacity of 10 kV XLPE power cables
,
2009
.
[2]
George J. Anders,et al.
Rating of Electric Power Cables in Unfavorable Thermal Environment
,
2005
.
[3]
J.J. Shea.
Rating of Electric Power Cables in Unfavorable Thermal Environment [Book Review]
,
2005,
IEEE Electrical Insulation Magazine.
[4]
Zhao Jiankang.
Calculation and Experiment of Transient Temperatures of Single-core Cables on Jacket Temperature Monitoring
,
2009
.
[5]
Zhao Jiankang.
Experimental Research on the Current Rating of 10 kV Three-core XLPE Cables
,
2009
.
[6]
Fan You-bing,et al.
Theoretical Calculation and Experimental Research on Thermal Time Constant of Single-core Cables
,
2009
.
[7]
Xu Linhua.
Experimental Research for the Current Rating of Medium and Low Voltage XLPE Cables in Cluster Laying
,
2005
.