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標題:勝緒牌大地網接地電阻測試儀
產品概述
產品概(gai)述:
勝緒牌大地網接地電阻測試儀適用于測試各類接地裝置的工頻接地阻抗、接地電阻、輔助機等工頻特性參數以及土壤電阻率。本儀器采用異頻抗干擾技術,能在強干擾環境下準確測得工頻50Hz下的數據。測試電流大5A,不會引起測試時接地裝置的電位過高,同時它還具有*的抗干擾能力,故可以在不停電的情況下進行測量。
產(chan)品特(te)點(dian):
1、勝緒牌大地網接地電阻測試儀測量可在設備不停電條件下進行測量,變頻技術避免主電網工頻干擾。
2、異頻小電流(0~50A)測量,注入電流頻率(30Hz—70Hz)可調。
3、大功率變頻電源保證隔離及盡可能大的電流輸出。
4、調頻電壓電流表采用數字帶通濾波器,帶有校驗裝置,確保測量方便準確。
5、高穩定度頻率信號源,確保整個測試過程的準確性。
6、可重復測量,提高測量的準確性,節省時間、金錢。
7、大地網接地電阻測試儀具有過高壓、過電流、短路及過熱警告裝置。
8、32位微處理器控制,智能化,操作靈活方便 。
9、低失真干擾,輸入/輸出*隔離,安全可靠。
10、*的瞬時值控制,波形失真度小,控制精度高。
11、動態反應極快,負載0-100%變化時,穩態反應時間<0.1S。
12、無輻射干擾,含諧波成分小,并經特殊處理,不產生干擾。
13、*日本三菱IGBT高頻逆變器及機芯,穩定可靠。
14、輸出電壓:低檔:0-200V、高檔:0-400V連續可調 。
15、頻率范圍:30Hz—70Hz 頻率步幅:1Hz。
16、頻率穩定度:< 180ppm。
17、供電電源 AC180~270V,50/60Hz。
結(jie)構原理(li):
本儀器主要(yao)由提供測(ce)試電(dian)(dian)流(liu)的(de)(de)異頻(pin)電(dian)(dian)源(yuan)、電(dian)(dian)流(liu)和電(dian)(dian)壓測(ce)量電(dian)(dian)路以及微電(dian)(dian)腦測(ce)控系統組成(cheng)。儀器通過(guo)測(ce)量接(jie)地(di)裝(zhuang)置的(de)(de)電(dian)(dian)位(wei)升高(gao)與流(liu)入接(jie)地(di)裝(zhuang)置的(de)(de)電(dian)(dian)流(liu)之比來測(ce)量接(jie)地(di)阻抗。
異(yi)頻(pin)(pin)(pin)恒(heng)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)源可輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)(pin)率(lv)(lv)為(wei)(wei)45Hz或55Hz的(de)正弦波(bo)(bo)測(ce)(ce)試(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu),輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)(pin)率(lv)(lv)受微電(dian)(dian)(dian)(dian)腦(nao)系(xi)統控制(zhi)。其輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)經過(guo)隔離后(hou)(hou)(hou)通過(guo)儀(yi)(yi)器(qi)(qi)面板上的(de)C1、C2兩(liang)個端(duan)子輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)。電(dian)(dian)(dian)(dian)壓(ya)(ya)放(fang)大(da)器(qi)(qi)為(wei)(wei)一個高輸(shu)(shu)(shu)(shu)入(ru)阻(zu)抗(kang)放(fang)大(da)器(qi)(qi),它將P1、P2兩(liang)端(duan)的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)放(fang)大(da)后(hou)(hou)(hou)送給濾(lv)(lv)波(bo)(bo)器(qi)(qi)。電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)放(fang)大(da)器(qi)(qi)將從電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)互感器(qi)(qi)取(qu)得(de)(de)的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)信(xin)(xin)號(hao)(hao)進(jin)(jin)行放(fang)大(da)后(hou)(hou)(hou)送給濾(lv)(lv)波(bo)(bo)器(qi)(qi)。濾(lv)(lv)波(bo)(bo)器(qi)(qi)用(yong)于濾(lv)(lv)除干擾信(xin)(xin)號(hao)(hao),只(zhi)允許45Hz和55Hz信(xin)(xin)號(hao)(hao)通過(guo)。A/D轉換器(qi)(qi)用(yong)于將電(dian)(dian)(dian)(dian)壓(ya)(ya)和電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)信(xin)(xin)號(hao)(hao)轉換為(wei)(wei)數字信(xin)(xin)號(hao)(hao)以便微電(dian)(dian)(dian)(dian)腦(nao)系(xi)統進(jin)(jin)行分(fen)析處(chu)理。 用(yong)戶啟動接地阻(zu)抗(kang)測(ce)(ce)量(liang)后(hou)(hou)(hou),儀(yi)(yi)器(qi)(qi)首(shou)先開啟異(yi)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)源使之(zhi)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)(pin)率(lv)(lv)為(wei)(wei)45Hz的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu),待電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)穩定之(zhi)后(hou)(hou)(hou),微電(dian)(dian)(dian)(dian)腦(nao)系(xi)統通過(guo)A/D轉換器(qi)(qi)取(qu)得(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)和電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)波(bo)(bo)形數據,進(jin)(jin)行數字濾(lv)(lv)波(bo)(bo)后(hou)(hou)(hou)計(ji)算出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)(dian)壓(ya)(ya)V45和電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)I45及其相位差,再進(jin)(jin)一步計(ji)算出(chu)(chu)(chu)(chu)阻(zu)抗(kang)Z45、電(dian)(dian)(dian)(dian)阻(zu)分(fen)量(liang)R45和電(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)X45。然后(hou)(hou)(hou),切換異(yi)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)源的(de)輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)(pin)率(lv)(lv)為(wei)(wei)55Hz,經過(guo)同樣的(de)步驟后(hou)(hou)(hou)可計(ji)算出(chu)(chu)(chu)(chu)阻(zu)抗(kang)Z55、電(dian)(dian)(dian)(dian)阻(zu)分(fen)量(liang)R55和電(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)X55。取(qu)Z45 和Z55的(de)平(ping)均值(zhi)作為(wei)(wei)工頻(pin)(pin)(pin)接地阻(zu)抗(kang)Z50。后(hou)(hou)(hou),關閉(bi)異(yi)頻(pin)(pin)(pin)電(dian)(dian)(dian)(dian)源,通過(guo)液晶屏顯示(shi)測(ce)(ce)量(liang)結(jie)果(guo)。因此阻(zu)抗(kang)測(ce)(ce)量(liang)時(shi),儀(yi)(yi)器(qi)(qi)測(ce)(ce)量(liang)的(de)是(shi)兩(liang)電(dian)(dian)(dian)(dian)壓(ya)(ya)輸(shu)(shu)(shu)(shu)入(ru)端(duan)P1、P2之(zhi)間的(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)與(yu)電(dian)(dian)(dian)(dian)源輸(shu)(shu)(shu)(shu)出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)之(zhi)比。
技術(shu)指標:
1、阻抗測(ce)量(liang)范圍(wei):0Ω~200Ω
2、分辨率:0.001Ω
3、測(ce)量誤(wu)差:±(讀數×2%+0.005Ω)
4、抗(kang)工(gong)頻50Hz 電(dian)壓干(gan)擾能(neng)力:10V
5、測(ce)試電流(liu)波形(xing):正弦波
6、測試電流頻率:45Hz/55Hz 49Hz/51Hz 等多組自動雙變頻可選
7、zui大(da)輸出電流:5A
8、zui大輸出電(dian)壓:400V
9、測(ce)量線(xian)要(yao)求: 電(dian)流(liu)線(xian)銅芯截面積≥2.0mm2
電(dian)壓線銅芯截面積(ji)≥1.5mm2
10、供電(dian)電(dian)源:AC220V±10%,50Hz
11、外形尺寸:440×350×210
12、儀器重(zhong)量:10kg
注意事項:
1、為使測試順利進行,測試前請先用萬用表檢查測試導線與地樁的接觸點是否完好,并測量已放好的線是否有斷路現象。
2、四極法測量時儀器會自動消除接線誤差。
3、當光標在電流上時候,按一下“確認”鍵,在屏幕左下角會出現或消失打印機小符號,代表選擇或取消自動打印功能。
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