Cable Temperature Rising Test by Current Capacities

Please find the images and contents below.

Temperature rising test by current capacities for Litz Cable(0.100mm x 15,750 strands, XLPE x 2 layers)

Time 15:25 15:35 15:45 15:55 16:00 16:05 16:08 16:12 16:30 16:37 17:00
A(ampere) 0 176 168 158 320 314 320 320 310 500 507
1. Conductor(℃) 93.6 93.7 95.8 96.0 96.3 99.0 99.5 99.7 97.7 103.2 104.5
2. Terminal(℃) 59.8 60.1 60.6 61.6 62.3 63.5 64.3 66.2 67.7 69.8 80.6
3. Terminal(℃) 59.2 59.6 60.0 60.8 61.9 62.2 63.5 64.6 66.2 67.6 78.5
4. Room Temp. (℃) 23.5 23.3 24.5 24.2 24.1 23.9 24.1 24.4 24.1 24.7 24.5
5. Room Temp. (℃) 22.1 22.8 23.0 23.2 23.0 23.2 23.2 23.1 23.2 23.3 23.4
6. Band Heater(℃) 85 82 81 83 88 86 89 89 88 81 86
7. Delta T(1. to 6.) (℃) 11.7 14.8 13 8.3 13 10.5 10.7 9.7 12.2 18.5

### The test started from 13:55 for the band heater pre-heating.
### Frequency : 60Hz
### As you see the above table, even if the current is doubled, the temperature does not rise with enough allowable current capacitity.

Please find our test report and the calculation as following.

We tested our LITZ CABLE ( ‘0.1mm x 15,750 strands’, XLPE(1.2t x 2 layers) )
Section area = 123.7㎟’s allowable current is 386A.
In case of ‘0.1mm x 15,750 strands’,
R(Resistance) = 1.6432 x 10 to the power of (-)four ohm/meter.
W(Watts) = I ²R = 165² x ( 1.6432 x 10 to the power of (-)four ) = 4.47 watts/meter
Current density ( A/㎟ ) = 1.33

Note :

‘0.1mm x 15,750 strands x XLPE(1.2t x 2 layers)’ = 123.7㎟
‘0.12mm x 9,500 strands x XLPE(1.2t x 2 layers)’ = 107.44㎟ >> 141Arms ( Current density ( A/㎟ ) = 1.31 )
In case of current rating 141Arms on ‘0.12mm x 9,500 strands’,
Current rating of ‘0.1mm x 15,750 strands’ would be 165Arms corresponding to ‘0.12mm x 9,500 strands’, 141Arms.

60092-352 IEC:2005(E)

Table B.4 - Current carrying capacities in continuous service as maximum rated conductor temperature of 90 deg.(℃)

60092-352 IEC:2005(E)