一种电缆护层接地系统的取能电源模块设计

doi:10.11985/2019.02.010

摘要/Abstract

摘要：

针对电缆隧道环境严酷、缺乏可用低压电源的现状,提出了一种用于电缆隧道内各类传感器及监测装置的取能方法并设计了取能电源。首先通过接入端口串接到电缆护层接地位置或电缆护层交叉互联位置获取电缆金属护层电流,获取的交流电流经保护电路、取能电路以及管理单元等各级电路处理得到稳定的直流5 V输出。为解决隧道电缆监测装置取电过电流保护、欠电流供能的问题,引入由锂电池和充放电电路组成的备用电源提供备用直流输出,由F320单片机及相关电路组成的管理单元作为取能电源的核心,通过特殊的算法和控制逻辑完成电压监测、电流监测、电源切换和通道控制等功能。经过试验验证,设计的取电电源能够完成整个隧道中的电缆监测传感器稳定供电。

关键词: 电力电缆, 护层电流, 取能方法

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

中图分类号:

TM932

郭宏燕,雍明超,卢站芳,卢声,兰五胜. 一种电缆护层接地系统的取能电源模块设计[J]. 电气工程学报, 2019, 14(2): 55-60.

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.

图/表 10

图1

表1

图2

图3

图4

图5

图6

图7

图8

表2

参考文献 10

[1]	郭昊坤, 吴军基 . 一种新型的可充电式高压感应取电装置[J]. 电测与仪表, 2014,51(3):86-90.
	Guo Haokun, Wu Junji . A new kind of rechargeable induction power supply at high voltage side[J]. Electrical Measurement & Instrumentation, 2014,51(3):86-90.
[2]	解军, 张喜林, 卢庆港 , 等. 电网监测设备TA取能电源性能分析与改进研究[J]. 电测与仪表, 2015,52(11):84-89.
	Xie Jun, Zhang Xilin, Lu Qinggang , et al. Performance analysis and improvement study for grid monitoring equipment power energy obtain base on TA principles[J]. Electrical Measurement & Instrumentation, 2015,52(11):84-89.
[3]	钟运平, 程小华, 戴栋 , 等. 基于ZigBee技术输电线路在线监测系统的研究[J]. 电测与仪表, 2013,50(5):105-109.
	Zhong Yunping, Cheng Xiaohua, Dai Dong , et al. Study on monitoring system of on-line power transmission lines based on ZigBee technology[J]. Electrical Measurement & Instrumentation, 2013,50(5):105-109.
[4]	李维峰, 付兴伟, 白玉成 , 等. 输电线路感应取电电源装置的研究与开发[J]. 武汉大学学报(工学版), 2011,44(4):516-520.
	Li Weifeng, Fu Xingwei, Bai Yucheng , et al. Development of power induction devices for transmission lines[J]. Engineering Journal of Wuhan University, 2011,44(4):516-520.
[5]	李华阳, 尚宇炜, 吴成才 , 等. 高压电缆感应式取电电源分析及设计[J]. 电力电子技术, 2012,46(10):83-86.
	Li Huayang, Shang Yuwei, Wu Chengcai , et al. Research on a electromagnetic induction fed power supply from high voltage cavle[J]. Power Electronics, 2012,46(10):83-86.
[6]	朱成喜, 刘亚东, 盛戈皞 , 等. 导线监测装置取电研究[J]. 电力电子技术, 2011,45(2):78-80.
	Zhu Chengxi, Liu Yadong, Sheng Gehao , et al. Study on power supply system in high-voltage transmission lines[J]. Power Electronics, 2011,45(2):78-80.
[7]	段建东, 叶兵, 张青山 , 等. 电缆分布式监测装置取能电源的研究[J]. 电力电子技术, 2015,49(8):63-65.
	Duan Jiandong, Ye Bing, Zhang Qingshan , et al. Study of induction power supply for distributed cable monitoring devices[J]. Power Electronics, 2015,49(8):63-65.
[8]	袁燕岭, 周灏, 董杰 , 等. 电缆护层电流在线监测及故障诊断技术[J]. 高电压技术, 2015,41(4):1194-1203.
	Yuan Yanling, Zhou Hao, Dong Jie , et al. Sheath current in HV cable systems and its on-line monitoring for cable fault diagnosis[J]. High Voltage Engineering, 2015,41(4):1194-1203.
[9]	杨忠君 . 高压电缆护层环流在线监测的实现与应用[J]. 冶金动力, 2017(2):47-50.
	Yang Zhongjun . Realization and application of online monitoring of circulation current on high voltage cable sheath[J]. Metallurgical Power, 2017(2):47-50.
[10]	马宏忠, 倪欣荣, 黎腊红 , 等. 高压电力电缆护层感应电压的补偿研究[J]. 高电压技术, 2007(3):148-151,183.
	Ma Hongzhong, Ni Xinrong, Li Lahong , et al. Research on compensation of induced voltage in the metal shield of the high-voltage power cable[J]. High Voltage Engineering, 2007(3):148-151,183.

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