Reduced neutral XLPE cable design
- British Columbia Hydro and Power Authority, Vancouver, BC (Canada)
This paper describes the theoretical, laboratory and economic analyses undertaken to determine the optimum metallic concentric neutral design for its single conductor 750 and 500 kcmil aluminum XLPE 15 kV insulated concentric-neutral type feeder cables. The results suggest that reducing the cross-sectional area of this concentric neutral from the currently-recognized industry standard of 20 percent of the central conductor to 7% results in overall present-worth system cost saving of approximately $3 per conductor meter or approximately 22% of the cable first cost. The neutral configuration ultimately chosen to replace the previous standard 37 - number 14 AWG wires was 2 - 1 inch {times} 5 mil tinned copper tapes overlapped by 25%. Line voltage fault test were run in the high-power laboratory on samples with various neutral configurations to confirm they would successfully pass our worst-case fault duty of 10 kA for 20 cycles (i.e., .33 sec) with no reclosing.
- OSTI ID:
- 7081191
- Journal Information:
- IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA), Vol. 5:2; ISSN 0885-8977
- Country of Publication:
- United States
- Language:
- English
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