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智慧式用電安全管理系統漏電報警,怎么處理降為安全值?


1.線路漏電的概念:


漏電是用電設備外殼和市電火線間由于某種原因連通后和地之間有一定的電位差產生的。


配電箱、配電柜三相五線制回路漏電:當A,B,C三相的綜合電流與零線的電流疊加后為0,即平衡時不漏電;相反,疊加后不為0時為漏電。


特別注意,三相火線本身不平等不會導致漏電(“純”三相回路中,三相電流疊加值為0)。

智慧用電系統安裝圖片3.png

智慧用電漏電報警系統側重于火災隱患的先兆預警,告訴有關人員去檢查原因和組織維修,不使事故擴大,是屬于線路和電氣設備發生故障的范疇;而火災自動報警系統,側重于火災已經發生,有煙霧或熱量產生,人員需要緊急疏散和組織撲救,是發生火災的緊急信號,這是兩種不同性質但又相互關聯的信號。因此,應視具體情況而定。


1)一般建筑物:在漏電監測點不太多的情況下,可以與火災自動報警系統相連接。因為在需要裝設漏電保護的區域或場所,一般都設有消防火災自動報警系統,漏電保護裝置的動作信號和檢測到的漏電電流(經過變送器),可以在就近很方便地接入消防輸入模塊,傳送到消防控制室(經常有人值班),這樣就可充分利用消防系統中的設備資源和人力資源,也便于集中統一管理,節省大量投資。但這兩種信號的顯示應有明顯的區別。


2)大型建筑物:在漏電監測點比較多的情況下,需要設置獨立的漏電監測報警系統作為電氣設備監控系統中的一個子系統,進行BAS管理,不宜與火災自動報警系統相連,避免火災自動報警系統受到過多的干擾。

智慧用電安全監控系統_副本2.jpg

2、智慧用電漏電監測裝置裝設在單相或三相上,其檢測到的電流是不同的


為了使裝設的漏電保護裝置能達到防止電氣火災的目的,對裝設的方式是否合適,裝設單相漏電保護還是裝設三相漏電保護呢應做具體分析。


2.1智慧用電漏電監測裝置裝設在單相上


單相線路上裝一個電流互感器,作為檢測漏電電流的探測元件,使相線和中性線穿過電流互感器


(1)正常情況:單相配電系統的正常泄漏電流等于通過漏電保護裝置的相線電流和中性線電流瞬時值的矢量和。


(2)事故情況:相線發生非金屬性單相接地短路(對地產生電弧),設接地短路電流為d,則漏電電流


由此可見,單相配電系統事故時的泄漏電流,等于通過漏電保護裝置的相線電流和中性線電流瞬時值的矢量和,亦即是漏電保護裝置的檢測裝置裝設在單相上,在正常情況,可以檢測到線路和設備的正常泄漏電流,事故時又能檢測到正常泄漏電流和接地短路電流兩部分電流的矢量和,當ILΣ的有效值大于漏電保護裝置動作電流的設定值時,漏電保護器動作,發出信號或脫扣跳閘。


2.2智慧用電漏電監測裝置裝設在三相上


三相線路上裝一個大電流互感器,作為檢測漏電電流的探測元件,使三根相線和中性線都穿過電流互感器。


(1)如供電系統無故障,亦無正常泄漏電流(理想情況)時,不論供電系統是否平衡,漏電保護裝置檢測到的電流均為零


(2)事實上,三相線路和設備正常時總有一些正常泄漏電流


(3)假如三相正常泄漏電流平衡


此時三相漏電保護裝置檢測到的正常泄漏電流為零;


(4)假如三相正常泄漏電流不平衡


此時三相漏電保護裝置檢測到的電流為三相不平衡的正常泄漏電流,其大小與不平衡程度有關。


(5)在三相正常泄漏電流平衡時


此時檢測到的是不平衡的正常泄漏電流及事故短路電流的矢量和,其電流大小應視不平衡的程度而定。在某種情況下,三相檢測到的電流可能會比事故相的短路電流或最大相的不平衡電流還小,不能反映每相真實的漏電電流的情況。

智慧用電現場隱患排查.jpg

從以上分析可以得出以下結論:


(1)在單相配電系統中,單相漏電保護裝置正常時,檢測到的電流為線路和設備的正常泄漏電流,發生單相非金屬性接地短路時,檢測到的電流為正常泄漏電流和接地短路電流的矢量和。


(2)在三相正常泄漏電流平衡的情況下(理想情況),三相漏電保護裝置檢測到的電流為零;在三相正常泄漏電流不平衡的情況下,三相漏電保護裝置檢測到的是三相不平衡的正常泄漏電流。


(3)目前生產的三相漏電保護裝置的探測器(或三相漏電斷路器)的檢測漏電電流的原理,大多是所有相線和“N”線都穿過一個電流互感器,其額定漏電動作電流(額定剩余動作電流)是按采集到的三相不平衡電流設定的,如用在三相進線、單相配電的情況,三相漏電斷路器的動作不能反映各相實際的漏電情況,有可能漏電保護裝置或漏電斷路器還未動作,但有的相線漏電電流可能已超過引發火災電流的最小限值,因此以上結構的三相漏電保護裝置或三相漏電斷路器,適用于在三相正常泄漏電流平衡或基本平衡的回路中。


(4)重要場所中,平時需要監控每相正常泄漏電流的變化;事故時又要監控全部的漏電電流。


此時漏電保護的檢測裝置應具有三個獨立的電流互感器或三個單相的漏電斷路器,并分別裝設在每個相線上,每相的“N”線必須通過各自的電流互感器。


3.智慧式用電安全管理系統漏電報警排查步驟方法:

漏電排查步驟.jpg

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