Research on Grounding and Sheath Protector Parameters of AC 27.5 kV Single Core Cable for Railway Electrification

doi:10.11985/2023.03.011

Abstract

Abstract:

The 27.5 kV cable is an important infrastructure for the traction power supply system of high-speed railway, and its operation is directly related to the safety and operation quality of high-speed railway transportation. Firstly, the working principle of the cladding protector is analyzed, the differences between the three-phase power cable and the single-phase 27.5 kV cable for electrified railway is analyzed, and the current status and existing problems of the current sheath protector for electrified railway 27.5 kV cable are summarized. Secondly, the grounding method of 27.5 kV cable is summarized, and then for the 27.5 kV cable with different conductor sections, different outer sheath insulation materials, and different number of shielded copper wires, the grounding wire, rated voltage, starting operating voltage, continuous operation voltage, nominal discharge current, residual voltage under nominal discharge current, power frequency withstand voltage, withstand high current surge voltage, current capacity, cable sheath minimum impact voltage, residual voltage, action number life and other parameters are studied in detail. And the parameters of the cladding protector are proposed, which has certain reference significance for the standard designation and selection of electrified railway cladding protector.

Key words: High speed railway, 27.5 kV single core cable, protective layer protector

CLC Number:

TM561

HE Changhong, HAN Lingqing, FANG Yi, WANG Shenglong, GUO Qipei, LI Shaopeng. Research on Grounding and Sheath Protector Parameters of AC 27.5 kV Single Core Cable for Railway Electrification[J]. Journal of Electrical Engineering, 2023, 18(3): 99-108.

Figures/Tables 12

References 24

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27.5 kV 电缆导体标称截面积/mm²	引出屏蔽软铜丝标称截面/mm²
95	25
120	25
150	25
185	35
240	35
300	50
400	50

27.5 kV电缆导体标称截面积/mm²	引出导线允许最小截面/mm²
95	25
120	25
150	25
185	35
240	35
300	50
400	50

电缆标称截面积/mm²	扁钢母线允许最小截面/mm²
95	210
120	250
150	310
185	380
240	490
300	620
400	820

材料名称	导电率(%IACS)	K_f常数
纯铜导线	100	3.55
镀锌钢	8.6	14.67
1020钢	10.8	8.08
镀铜钢接地母线	20	7.42
铜包钢绞线	30	6.11
铜包钢绞线	40	5.3

电缆规格/ mm²	屏蔽铜丝根数n	n(1/n-1)	电缆导体半径r_c/mm	金属屏蔽半径r/mm
1×95	42	1.095 4	5.85	20.185
1×120	42	1.095 4	6.55	20.885
1×150	42	1.095 4	7.3	21.635
1×185	59	1.072 8	8.15	22.485
1×240	59	1.072 8	9.2	23.535
1×300	84	1.054 8	10.3	24.635
1×400	84	1.054 8	11.75	26.085