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  8. 專業從事電力電源智能模塊的研發、生產以及銷售,有任何需求或疑問可以撥打右方熱線咨詢
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    關于直流屏的小知識,直流屏介紹
    時間:2021-11-02 09:34:04 點擊次數:5863

    電力設備的不斷完善,企業安全意識的不斷提高以及發電廠和變電站中大多選用直流電源。為保護和控制電力系統,直流屏無疑起到至關重要的效果,既可以為控制負荷和動力負荷供給電源,也可以為事端照明負荷供給電源。下面讓我給您介紹一下什么是直流屏,直流屏有哪些效果以及怎么運用直流屏等方面給您做一個解說。

     

    直流屏的定義

    直流屏即供給安穩直流電源的設備,是一種全新的數字化控制、保護、處理、測量的新式直流系統,又稱直流電源操作系統或智能免保護直流電源屏,其通用型號為GZDW。

    具體是由交配電單元、充電模塊單元、降壓硅鏈單元、直流饋電單元、配電監控單元、監控模塊單元及絕緣監測單元組成。其間,監控主機選用單板結構(all in one),高度集成化,各個工作情況和參數均以漢字或許英文閃現在規劃簡潔的大液晶觸摸屏上,人機界面友愛,十分符合用戶習氣,一同具有微機中心信號、電池巡檢、絕緣督查、接地選線、電池活化、硅鏈穩壓等多重功用。直流屏系統具有四遙功用(遙控、遙調、遙測和遙信)和遠程通訊接口,為遠程檢測和控制供給了強而有力的支撐。經過遠程通訊接口可獲取直流電源系統的具體工作參數,并加以修正或設定以滿意電力系統無人值守變電站的要求,抵達電力系統自動化。

     

    直流屏中整流模塊的特點

    三相交流輸入首先經防雷處理和EMI濾波。可以有效吸收雷擊殘壓和電網尖峰,確保電源模塊后級電路的安全。         

    三相交流經整流和無源PFC后轉換成高壓直流電,經半橋PWM電路后轉換為高頻交流,再經高頻變壓器隔絕降壓后高頻整流輸出。         

    電源模塊控制部分擔任PWM信號產生及控制,確保輸出安穩,一同對電源模塊各部分進行保護,供給四遙接口。         

    電源模塊監控模塊參數設置、電源作業參數及情況的檢測和閃現、電源作業參數校準,完結電源和主監控器之間的通訊,完結四遙功用。        

    電源模塊選用變頻自然諧振軟開關技能,使得電源轉換功率大大提高,滿載輸出時功率最高可達95%。        

    選用無源PFC 技能,功率因數抵達0.9以上。        

    均流控制完結各模塊并機時輸出自主均流,使各模塊并機作業時均分負載。        

    電源模塊監控選用單片機控制,完結模塊輸出電壓、電流收集;完結開關機、均浮充、輸出電壓、輸出限流控制;完結電源參數設置和參數校準;經過RS485通訊口完結四遙功用。

     

    直流屏電源屏的效果

    直流屏的效果就是將交流電變壓-整流,成為直流電,并儲存在蓄電池組中,另外還有直流配電輸出。隨著計算機技能和通訊技能的快速展開,電力系統逐步向著概括自動化、網絡化會集處理以及電站或電廠無人值守的方向展開。而這種自動化系統對不安全風險的就需求采取必定的方法。作為電力系統的重要組成部分,直流屏使用許多科學技能,選擇高性能概括控制器對直流屏的每個工作環節進行監控;選擇電池巡檢單元以確保蓄電池(蓄電池可確保系統在斷電情況下或是直流電源系統自身損壞而出現斷電情況下正常運作)的電壓正常,如有發現蓄電池惡化現象,可及時處理,這樣就算在斷電情況下,仍能向外及時供給直流電源,避免事端產生;對充電機的選擇一般都是傾向于規劃簡略,出色的可靠性的電力專用高頻開關電源模塊。

    220V 65 Ah以上直流屏一般選用ATM230Z10電力專用高頻開關電源模塊,220V 65Ah以下大多選用ATM230Z05型電源模塊;通訊系統,顧名思義起到快速及時得到信息的效果,因而可供給本地或遠地報警功用,一同還能根據客戶要求選配絕緣監測單元完結饋出支路的小電流絕緣監測。許多使用于中小型發電廠、水電站、各類變電站、配電所、通訊部分、計算機房、賓館、醫院、礦井等均需求應急電源的當地,安全可靠,用途十分廣泛。

    直流屏常見缺點及解決方法

    直流屏常見缺點有以下幾點:  

    針對各類變電站直流屏,若閃現交流空開跳閘,但并沒有動作。應當檢查三處當地是否正確:

    a.接線是否正確可靠;

    b. 控制模塊作業情況是否正確;

    c. 空開情況和接點是否正確。  

    有人以為只需確保直流屏進線交流電的供給,就可以不必設備蓄電池,這種主意是不可取的。首先要充分認識到蓄電池是變電站內最可靠的直流電源,在變電站交流失電的情況下,蓄電池會給UPS系統、繼電保護設備、事端照明和監控設備等供電,以抵達應急的效果。其次蓄電池作為可靠的備用電源,可以彌補電磁開關合閘時所需的直流電源,避免直流母線電壓瞬間下降而影響繼電保護設備的正常工作。  

    合閘硅整流器或控制硅整流器失電:

    a.交流進線電源失電會產生合閘硅整流器、控制硅整流器、充電電源一同宣布失電信號,電源康復后即可消除;

    b. 直流輸出端空氣開關脫扣或硅整流器直流輸出端快熔熔斷替換同標準的快熔或合上空氣開關,缺點消除;

    c.如若交流電源缺相,直流輸出電壓只能抵達額定值的60%-70%,用萬用表測硅整流器輸 入端三相電壓即可,處理后便可康復正常。

    直流屏具體的技能參數

    三相交流輸入電壓:AC380±15℅V

    輸入電源頻率:50HZ

    控制輸出額定電壓:DC220VDC110V

    控制輸出額定電流:DC20A –DC500A

    最大充電電流:DC 0.1C10(C10為蓄電池十小時放電率)  

    浮充電壓:DC 232VDC116V

    均充電壓:DC 243V  DC 123V

    額定絕緣電壓:DC500V

    穩壓精度:≤ 0.2℅  

    穩流精度:≤±0.5%  

    控制母線紋波系數:≤0.1℅   

    限流精度:≤K0.2℅   

    運用條件  

    環境溫度-15℃ 45℃,日平均氣溫≤35℃  

    相對濕度不大于85℅  

    運用場所的污染等級≤3級。

    (有導電性污染, 或由于預期的凝露使干燥的非導電性污染物變為導 電性的)  

    產品垂直設備的歪斜應≤5 

    設備地址海拔≤2000 

    設備應設備在無爆炸風險及腐蝕性氣體的場所

    智能直流屏的注意事項

    檢查內部全部緊固件是否松動、確保電氣元器件無缺。  

    設備就位后應可靠接地,將全部開關置于斷開位置,并革除全部繼電器動觸點的緊固件。  

    按照設備圖紙要求,檢查輸入交流電壓是否符合設備電壓要求,并檢查輸入電源引線,控制 回路及設備間全部聯絡線是否有誤。  

    設備若經遠程運輸或長期存放后,應先用500伏兆歐表 測量,直流母線對地絕緣電阻,一般絕緣電阻大于2兆歐均 屬合格。測驗前有必要可靠短接或革除二極管,革除電池組與外電路的連接線和直流母線絕緣監督設備的接地址等。測驗 后應康復原狀。

    直流屏的日常保護方法

    工作監控人員應具體記載直流屏的工作情況,電流,電壓等,有問題應及時處理  

    檢查各信號燈是否正常工作  

    蓄電池組工作情況的檢查并清理:

    a, 若有蓄電池漏液現象,應及時查找原因并處理,避免影響蓄電池的絕緣;

    b. 電池液面若遠離上液面線,應及時補加蒸餾水;

    c. 充浮情況下,蓄電池是不發熱的,若有發熱現象應及時處理;

    d.檢查蓄電池組的連接點,觸摸是否緊密,有無氧化,并涂些凡士林油。

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