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Dynamic line rating

The transport of electricity heats the conductors through which the current flows. This heating causes conductors to sag, so there is a limit to the maximum transmission capacity of a high-voltage line. However, the weather can have a beneficial effect on the cooling of the conductors.

At low temperature, but mainly due to wind, the line is cooled more which results in less sag. In such a case, therefore, more power can be transported.

With the Dynamic Line Rating technique, the overhang and transmission capacity of a number of critical line segments of the high-voltage line is determined in a direct manner every 5 minutes. Based on this measurement data, it can then be determined how much additional transport can take place over the line in question. This method provides additional capacity if the high-voltage line is the limiting factor.