大截面高压电缆导体结构设计选型
Design and Selection of Conductor Structure for Large Cross-section High-Voltage Cable
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摘要: 根据IEC 60287标准，计算了不同导体类型的800 mm2和2 500 mm2高压电缆的导体交流电阻，并计算出不同类型导体的220 kV 800 mm2和220 kV 2 500 mm2高压电缆载流量。结果表明，采用绝缘单丝和分割类型的800 mm2导体，其交流电阻比紧压圆形导体降低8.06%；对于220 kV 800 mm2电缆，绝缘单丝分割导体电缆相对于紧压圆形导体电缆，载流量提高约4%～5%。采用绝缘单丝类型的2 500 mm2分割导体，其交流电阻比反向绞合裸单丝导体降低22.73%；绝缘单丝绞合导体的220 kV 2 500 mm2电缆载流量，相对于裸单丝反向绞合导体电缆提高大于11%。因此对于大截面高压电缆，分割导体设计、绝缘单丝以及同向绞合工艺，可有效降低电缆导体交流电阻，提高其输送容量。Abstract: According to IEC 60287,the ac resistance of 800 mm2 and 2 500 mm2 power cable conductors with different design types were calculated,also the current rating for 220 kV 800 mm2 and 220 kV 2 500 mm2 power cables.The results show that the ac resistance of 800 mm2 conductor with insulated wires and Milliken type decrease 8.06%comparing to the compacted round conductor.the current rating,for 220 kV 800 mm2 cable with insulated wires and Milliken type conductor,increase about 4%-5%compared with compacted circular conductor cable.The ac resistance of the 2 500 mm2 conductor with insulated wires decrease 22.73%comparing with the bare bi-directional wire conductor.The current rating,for 220 kV 2 500 mm2 power cable with insulated wires conductor,is more than 11%higher than 220 kV 2 500 mm2 power cable with bare bidirectional wire conductor.Therefore,Milliken design,insulated wires and uni-directional stranded process can effectively reduce the ac resistance of the conductor and improve the transmission capacity for the HV power cable.
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