Design of a Power Supply Module for Grounding System of Cable Protective Layer

doi:10.11985/2019.02.010

Abstract

Abstract:

An energy acquisition method for all kinds of sensors and monitoring devices in cable tunnel is presented, and the energy recovery power supply is designed to be directed against the harsh environment and the lack of available low-voltage power supply of cable tunnel. First of all, the cable metal protective current is obtained by connecting the connection port to the grounding position of the cable protective layer or the interconnecting position of the cable protection layer. The obtained current handles by protected circuit, energy acquisition circuit and management unit,then get stable DC 5 V output. In order to solve the problem of over-current protection and undercurrent supply of tunnel cable monitoring device, the backup power supply composed of lithium battery and charge / discharge circuit is introduced to provide the backup DC output, and the management unit composed of F320 single chip microcomputer and related circuits is used as the core of the energy recovery power supply, and the voltage monitoring as well ascurrent monitoring, power switching and channel control functions are accomplished through special algorithm and control logic. The whole power supply provides a stable power supply for the cable monitoring sensor in the tunnel.

Key words: Power cable, cable protective layer current, power supply

CLC Number:

TM932

GUO Hongyan,YONG Mingchao,LU Zhanfang,LU Sheng,LAN Wusheng. Design of a Power Supply Module for Grounding System of Cable Protective Layer[J]. Journal of Electrical Engineering, 2019, 14(2): 55-60.

Figures/Tables 10

References 10

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电缆长度L/m	电压等级a/kV	接地方式	护层电压水平b/V
L≤500	10	两端直接接地	<50
L≤500	≥35	一端直接接地, 一端保护接地	50≤b<100
500<L<1 000	10	一端直接接地, 一端保护接地	50≤b<100
500<L<1 000	≥35	中间直接接地, 两端保护接地	50≤b<100
L≥1 000	≥35	中间交叉互联, 两端直接接地	50≤b<100

负荷电流/ A	输入电压U₀/V	输出电压/ V	输出功率/ W	装置温度/ ℃
0	0	0	0	24
20	0.58	0	0.00	24
32	5.8	5.4	20.21	24
59	7.34	5.4	22.45	24
80	10.28	5.4	30.1	24
97	12.56	5.4	31.2	24
100	12.87	5.4	31.6	24
122	14.66	5.4	34.3	24
150	16.21	5.4	40.9	24
182	20.52	5.4	42.1	24
223	25.21	5.4	49.4	24
275	30.41	5.4	50.1	24
335	41.38	5.4	50.1	25
371	44.12	5.4	50.1	25
430	50.36	5.5	50.2	25
1 000	86.64	5.5	50.2	30
1 500	90.32	5.5	50.2	38
2 000	100.56	0	0	24

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