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1.1 平衡桥-非平衡桥检测法

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

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

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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