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1.1 平衡橋-非平衡橋檢測(cè)法

平衡橋-非平衡橋檢測(cè)法是經(jīng)過(guò)模仿平衡狀況和非平衡狀況來(lái)完成的。絕緣電阻對(duì)地檢測(cè)原理如圖1所示。

在需求檢測(cè)直流體系絕緣時(shí)，操控K1閉合，K2、K3斷開(kāi)，CPU收集到CL+對(duì)地電壓UL1及CL-對(duì)地電壓UN1,得出公式(1)：

注：R1:平衡橋CL+對(duì)地電阻;R2:平衡橋CL-對(duì)地電阻;R5:CL+對(duì)地電阻;R6:CL-對(duì)地電阻。

然后對(duì)CL+對(duì)地電壓及CL-對(duì)地電壓進(jìn)行比較，當(dāng)CL+對(duì)地電壓大于CL-對(duì)地電壓時(shí)，CPU操控K2閉合，收集到CL+對(duì)地電壓UL2及CL-對(duì)地電壓UN2,得出公式(2)：

注：R1:平衡橋CL+對(duì)地電阻;R2:平衡橋CL-對(duì)地電阻;R3:非平衡橋CL+對(duì)地電阻;R4:非平衡橋CL-對(duì)地電阻;R5:CL+對(duì)地電阻;R6:CL-對(duì)地電阻。

如果當(dāng)CL+對(duì)地電壓小于CL-對(duì)地電壓時(shí)，CPU操控K3閉合，收集到CL+對(duì)地電壓UL3及CL-對(duì)地電壓UN3,得出公式(3)：

注：R1:平衡橋CL+對(duì)地電阻;R2:平衡橋CL-對(duì)地電阻;R5:CL+對(duì)地電阻;R6:CL-對(duì)地電阻;R3:非平衡橋CL+對(duì)地電阻;R4:非平衡橋CL-對(duì)地電阻。

經(jīng)過(guò)公式(1)與公式(2)或公式(3)可以核算出CL+對(duì)地電阻R5及CL-對(duì)地電阻R6.

1.2 體系全體功能介紹

直流絕緣監(jiān)測(cè)模塊全體框圖如圖2所示：

體系在收到后臺(tái)的命令后開(kāi)端檢測(cè)絕緣狀況，經(jīng)過(guò)操控切換平衡橋與非平衡橋收集相關(guān)電壓數(shù)據(jù)，經(jīng)處理后送人CPU,CPU根據(jù)平衡橋-非平衡橋檢測(cè)法對(duì)數(shù)據(jù)進(jìn)行處理后得到實(shí)踐直流母線(xiàn)對(duì)地絕緣值，然后經(jīng)過(guò)通訊送到后臺(tái)，當(dāng)絕緣值到達(dá)必定規(guī)模時(shí)，向后臺(tái)宣布告警，后臺(tái)提示相關(guān)人員進(jìn)行處理。

2.體系硬件規(guī)劃

2.1 體系中心電路

本體系選用ST公司的STM32F107RC處理器，使用了芯片的USART、CAN、SPI總線(xiàn)、I2C及GPIO等功能，其體系中心電路結(jié)構(gòu)圖如圖3所示：

體系經(jīng)過(guò)RS485接口與上位機(jī)體系進(jìn)行通信，實(shí)時(shí)傳輸直流體系絕緣狀況;經(jīng)過(guò)I2C擴(kuò)展的存儲(chǔ)器EEROM用來(lái)寄存一些體系給定值;復(fù)位電路保證體系的牢靠安穩(wěn)運(yùn)轉(zhuǎn)，開(kāi)入開(kāi)出用來(lái)檢測(cè)一些體系狀況并及時(shí)給出告警;體系絕緣檢測(cè)電路是使用外部ADC+光耦+分壓橋臂電阻的方法完成。

2.2 絕緣檢測(cè)電路

絕緣檢測(cè)電路是使用平衡橋--非平衡橋原理進(jìn)行檢測(cè)，具體檢測(cè)電路結(jié)構(gòu)圖如圖4所示：

經(jīng)過(guò)平衡橋-非平衡橋電路檢測(cè)到不同的電壓狀況，經(jīng)過(guò)運(yùn)放電路進(jìn)行擴(kuò)大，輸入到ADC把模仿電壓值轉(zhuǎn)換為數(shù)字電壓值，然后經(jīng)過(guò)光耦阻隔進(jìn)入CPU進(jìn)行核算處理，得出實(shí)踐接地電阻值并給出告警。

3.實(shí)驗(yàn)成果

把電阻接在CL+與PE之間或CL-與PE之間，用該硬件檢測(cè)電路檢測(cè)接入的電阻值，成果如表1所示：

經(jīng)過(guò)實(shí)踐檢測(cè)驗(yàn)證，8KΩ到100KΩ規(guī)模內(nèi)檢測(cè)精度可以到達(dá)5‰，可以滿(mǎn)意體系需求。

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