FIFE CSP-01-06

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1.1 平衡桥-非平衡桥检测法FIFE CSP-01-06

平衡桥-非平衡桥检测法是经过模仿平衡状况和非平衡状况来完成的。绝缘电阻对地检测原理如图1所示。

在需求检测直流体系绝缘时，操控K1闭合，K2、K3断开，CPU收集到CL+对地电压UL1及CL-对地电压UN1,得出公式(1)：

注：R1:平衡桥CL+对地电阻;R2:平衡桥CL-对地电阻;R5:CL+对地电阻;R6:CL-对地电阻。

然后对CL+对地电压及CL-对地电压进行比较，当CL+对地电压大于CL-对地电压时，CPU操控K2闭合，收集到CL+对地电压UL2及CL-对地电压UN2,得出公式(2)：

注：R1:平衡桥CL+对地电阻;R2:平衡桥CL-对地电阻;R3:非平衡桥CL+对地电阻;R4:非平衡桥CL-对地电阻;R5:CL+对地电阻;R6:CL-对地电阻。

如果当CL+对地电压小于CL-对地电压时，CPU操控K3闭合，收集到CL+对地电压UL3及CL-对地电压UN3,得出公式(3)：

注：R1:平衡桥CL+对地电阻;R2:平衡桥CL-对地电阻;R5:CL+对地电阻;R6:CL-对地电阻;R3:非平衡桥CL+对地电阻;R4:非平衡桥CL-对地电阻。

经过公式(1)与公式(2)或公式(3)可以核算出CL+对地电阻R5及CL-对地电阻R6.

1.2 体系全体功能介绍FIFE CSP-01-06

直流绝缘监测模块全体框图如图2所示：

体系在收到后台的命令后开端检测绝缘状况，经过操控切换平衡桥与非平衡桥收集相关电压数据，经处理后送人CPU,CPU根据平衡桥-非平衡桥检测法对数据进行处理后得到实践直流母线对地绝缘值，然后经过通讯送到后台，当绝缘值到达必定规模时，向后台宣布告警，后台提示相关人员进行处理。

2.体系硬件规划FIFE CSP-01-06

2.1 体系中心电路

本体系选用ST公司的STM32F107RC处理器，使用了芯片的USART、CAN、SPI总线、I2C及GPIO等功能，其体系中心电路结构图如图3所示：

体系经过RS485接口与上位机体系进行通信，实时传输直流体系绝缘状况;经过I2C扩展的存储器EEROM用来寄存一些体系给定值;复位电路保证体系的牢靠安稳运转，开入开出用来检测一些体系状况并及时给出告警;体系绝缘检测电路是使用外部ADC+光耦+分压桥臂电阻的方法完成。

2.2 绝缘检测电路

绝缘检测电路是使用平衡桥--非平衡桥原理进行检测，具体检测电路结构图如图4所示：

经过平衡桥-非平衡桥电路检测到不同的电压状况，经过运放电路进行扩大，输入到ADC把模仿电压值转换为数字电压值，然后经过光耦阻隔进入CPU进行核算处理，得出实践接地电阻值并给出告警。

3.实验成果

把电阻接在CL+与PE之间或CL-与PE之间，用该硬件检测电路检测接入的电阻值，成果如表1所示：

经过实践检测验证，8KΩ到100KΩ规模内检测精度可以到达5‰，可以满意体系需求。

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3HAB 2245-1 (DSQC 266H) 3HAB8800-1 ABB 

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3HAC17971-1 ABB

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DSQC 335 6369901-327 ABB 

DSQC 363 6369901-425 ABB 

DSQC 346E 6369901-464 ABB 

DSQC 219 YB560103-AY ABB 

DSQC 233 YB560103-BS ABB 

DSQC 564A 3HAC022104-001 ABB 

DSQC 540A 6369901-610 ABB 

DSQC 105 YB161102-AF ABB 

DSQC 508 3HAC5393-2 ABB 

DSQC 323 3HAB5956-1 ABB 

DSQC 324 3HAB5957-1 ABB 

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DSQC 115 YB161102-BS ABB 

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DSQC 126 YB161102-BM ABB 

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DSQC 561 3HAC16036-1 ABB 

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DSQC 127 YB161102-BY ABB 

DCQC 355 3HNE00554-1 ABB 

DSQC 237 YB560103-CF ABB 

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DSQC 211S 5FSE706364-2 ABB 

DSQC 258 6369901-271 ABB 

DSQC 324 3HAB5957-1 ABB 

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DSQC 637 3HAC023047-001 ABB 

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DSQC 532A 6369901-607 ABB 

DSQC 174 6369901-35 ABB 

DSQC 345A 6369901-419 ABB 

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DSQC 345D 6369901-463 ABB 

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DSQC 604 3HAC020597-001 ABB 

DSQC 631 3HAC021629-001 ABB 

DSQC 500 3HAC3616-1 ABB 

DSQC 327A 6369901-620 ABB 

3E033864 ABB 

3E041278 ABB 

DSQC 223 3HAB2125-1 ABB 

DSQC 374 3HAC3462-1 ABB 

DSQC 328 3HAC1948-1 ABB 

DSQC 239 3HAB2572-1 ABB 

DSQC 385 3HAC9565-1 ABB 

DSQC 355 3HAB7342-1 ABB 

3E041250 ABB 

3HAC14864-1 ABB 

3HNM11971-1 ABB 

DSQC 243 3HAA0001-CP ABB 

DSQC 243 6369901-210 ABB 

DSQC 202 3E041242U ABB 

DSQC 509 3HAC5687-1 ABB 

3E042760U ABB 

3HAC11530-1 ABB 

3HNE00955-1 ABB 

6369901-639 ABB 

DSQC 142 YB161600-CE ABB 

3E041776 ABB 

3E041926 ABB 

DSQC 508 3HNE03277-1 ABB 

3E041775 ABB 

DSQC 505/5063HNE04092-1 ABB 

DSQC 215 6369901-177 ABB 

DSQC 224 26390351-PF ABB 

3HAC020079-001 ABB 

DSQC 224 YB560105-DH ABB 

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6369901-614 ABB 

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DSQC 562 3HAC16014-1 ABB 

3HNE8101-1 ABB 

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6369901-617 ABB 

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DSQC 231 YB560103-BP ABB 

DSQC 624 3HAC020150-001 ABB