Present Ranking for Teams of Circuits Put in in Air

For a number of buried circuits that is comparatively easy train to find out the mutual heating since conduction of warmth flux by the soil is the one mechanism of warmth switch and so the superposition theorem could be assumed in keeping with IEC 60287-2-1.

For a number of circuits in air the mutual heating results are extra sophisticated since they encompass each convection and radiation warmth switch mechanisms. For teams of circuits in air of the identical cable kind, with the identical losses (i.e. carrying the identical currents) and neglecting dielectric losses (for XLPE insulated cables dielectric losses can solely be uncared for beneath 63.5 kV) we will confer with Customary IEC 60287-2-2 for steerage.

Customary IEC 60287-2-2 gives 12 commonplace (fastened) configurations for calculation of present ranking of teams of cables (of the identical cable kind) in air. These configurations are offered within the In Teams module of Cable HV™ Software program (picture beneath). The rationale there are solely fastened configurations out there is as a result of the tactic on this commonplace was developed based mostly on bodily experiments which was restricted to a examine of solely these 12 configurations.


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