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a供給用戶使用,作為充值信息以及電表信息的載體,具有兩個區域:

 

1)售電區:存放充值電量、電表設置參數等信息,由售電系統負責寫入,每次插卡時電表自動讀取,進行充值及參數設置;2)電表數據返寫區:存放電表當前狀態信息,每次插卡時由電表負責寫入,售電系統讀卡時可以從中獲取電表信息; 用戶卡具有三種狀態:1)開戶卡:售電系統在用戶首次前來購電時提供,新裝電表插入開戶卡時完成一戶一表的對應關系,用戶第二次來購電時售電系統自動將開戶卡改為購電卡;2)購電卡:用戶日常購電所用;3)補卡:在用戶卡遺失或損壞時提供給用戶,插卡后電表自動記錄新卡的序號,用戶下次來購電時售電系統自動將補卡改為購電卡;

修改密鑰卡 在公鑰狀態下插卡可以將電表出廠時的公開密鑰修改為正式的運行密鑰,在運行密鑰下插卡無效; 恢復密鑰卡 在運行密鑰下插卡可以將電表的運行密鑰恢復為公開密鑰,便于電表檢測或返廠維修;

修改表號 在公鑰狀態下插卡可以修改電表表號,并初始化電表參數、狀態改為未開戶狀態,在運行密鑰下插卡無效; 預置卡 為電表設置預留電量、報警電量等參數(在公開密鑰狀態下),一般在安裝前使用,在運行密鑰下插卡無效;當預置卡插入電表成功后,輪顯一遍設置完畢后的各數據項,依次顯示剩余電量、脈沖常數(此常數不能被修改)、報警電量一、報警電量二(即透支電量)、囤積電量;

檢測卡 用來對電表進行故障和運行狀態檢測,此卡對所有電表通用,插入電能表后將返回當前的計量和狀態信息,在公開密鑰及運行密鑰下均可使用; 增加電量卡 在公鑰狀態下插卡可以增加電表剩余電量,不影響其它參數,用于走字、校表過程中,在運行密鑰下插卡無效;

繼電器測試卡 在公鑰狀態下插卡,電表繼電器將切換到與目前狀態相反的工作狀態,用來檢測繼電器通斷是否正常,在運行密鑰下插卡無效; 快速測試卡 在公鑰狀態下插卡,用來在生產過程中快速測試電表的功能,插卡時,電表將卡中的數據讀入到相應數據單元,并以當前脈沖常數進行電量處理,測試完畢掉電后,當前脈沖常數自動失效,電能表將以正常的脈沖常數進行電量處理;

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