Abstract
Aiming at the heavy weight and inconvenience when carrying and installing copper earthing wires on the UHV transmission lines, in this paper, we present the use of copper clad aluminum(CCA) composite materials as a lightweight method for UHV earthing wire conductor. Theoretical calculations and tests of the fusing current in a short time for copper and CCA material are conducted. The results show that the theoretical value of the earthing wire conductor's fusing current corresponds with the test value on condition of the conductor cross section greater than 4mm2 as well as fusing time less than 1.5s. The CCA-10 earthing wires get 36.2% weight reduction compared with copper wires.
Highlights
UHV power transmission has the advantages of large transmission capacity, long distance of power transmission, low wire loss and less land occupation and other outstanding advantages
The use of copper clad aluminum composite wire as UHV earthing wire conductor has small density compared to the pure copper wire while it has higher electrical and mechanical property than the pure aluminum wire
When the rated short-circuit time is t, the unit length weight of copper and Copper clad aluminum (CCA) earthing wire is: m Cu 3.15 10 5 KIr t mCCA 10 2.01 10 5 KIr t mCCA 15 2.12 10 5 KIr t mCCA 20 2.24 10 5 KIr t. It could be seen from the above formula that when the rated short-circuit current of the earthing wire is the same with the short circuit time, the section area needed by CCA earthing wire is greater than the pure copper wire, the overall weight of earthing wire conductor decreases because CCA material density is much smaller than copper; the smaller the proportion of copper layer is, the more the weight reduces
Summary
UHV power transmission has the advantages of large transmission capacity, long distance of power transmission, low wire loss and less land occupation and other outstanding advantages. In regards to the material of the earthing wire conductor, the US standard ASTM F855-15[8] only stipulates to use the copper wire. Copper clad aluminum (CCA) is a new type of material that enabled a strong metallurgical bonding of copper layer and aluminum layer at the interface. It has high electrical conductivity and thermal conductivity of copper, and has the low density and low price of aluminum[15,16]. The dimension parameters of earthing wire of copper and copper clad aluminum materials are determined and the weight loss effect of copper-clad aluminum composite material is verified quantitatively
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