SIEMENS 505-6108A

事故發(fā)生時的情況是，SCS站的I/O模板中，1，2，4號SDM的外部24VDC消失，而這3塊模板均組態(tài)為SCS站開關(guān)量輸入模塊，其中包括A、B引風(fēng)機運行的信號，所以這些輸入通道均變?yōu)?0"，A，B引風(fēng)機運行信號也為"0"。因SCS的程序組態(tài)中，A、B引風(fēng)機跳閘信號是A、B引風(fēng)機運行信號取反，所以A、B引風(fēng)機跳閘信號均變?yōu)?1"，即誤發(fā)了2臺引風(fēng)機跳閘的信號。

　　(3) 根據(jù)圖1中所示的SCS引風(fēng)機順序控制邏輯，如引風(fēng)機跳閘，延時1 min，會聯(lián)鎖關(guān)引風(fēng)機進(jìn)口擋板和出口風(fēng)門。事故發(fā)生時爐膛負(fù)壓調(diào)節(jié)系統(tǒng)投自動運行，引風(fēng)機進(jìn)口擋板處于DCS自動控制中，聯(lián)鎖信號發(fā)揮作用，結(jié)果2臺引風(fēng)機的進(jìn)口擋板和出口風(fēng)門均被關(guān)閉。

　　(4) FSSS中，引風(fēng)機全部跳閘或進(jìn)口擋板開度均小于3%，就判斷為鍋爐失去全部引風(fēng)機，這是MFT的條件之一。實際上2臺風(fēng)機的進(jìn)口擋板已經(jīng)全關(guān)，所以引發(fā)MFT動作，緊接著汽輪機和發(fā)電機也聯(lián)鎖跳閘，機組全停。

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