產品簡介：

50A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、接觸電壓、跨步電壓、等工頻特性參數以及土壤電阻率。可測變電站地網（4Ω）、水火電廠、微波站（10Ω）、避雷針（10Ω）多用機型。
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z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。

50A大地網接地電阻測試儀技術指標：

1、阻抗(kang)測量范圍(wei)：0Ω～200Ω

2、分辨率(lv)：0.001Ω

3、測量誤差：±（讀數×2％+0.005Ω）

4、抗工頻50Hz 電壓干擾能力(li)：10V

5、測試電(dian)流波形：正弦波

6、測試電流頻率：45Hz/55Hz 49Hz/51Hz 等多組自(zi)動(dong)雙變頻可選

7、z大輸出電流：5A

8、z大輸出電壓：400V

9、測量線要(yao)求(qiu)： 電流線銅(tong)芯截面積≥2.0mm2

電壓線(xian)銅芯截面積≥1.5mm2

10、供(gong)電(dian)電(dian)源(yuan)：AC220V±10％，50Hz

11、外形尺寸(cun)：440×350×210

12、儀器重量：10kg

性能特(te)點：

1. 測量的工頻等效(xiao)性好(hao)。測試電(dian)流(liu)波形為正(zheng)弦波，頻率僅與(yu)工頻相差為5Hz，使用(yong)45Hz和55Hz兩種頻率進行測量。

2. 抗干擾能(neng)(neng)力強。本儀器采用異頻法測量，配合現代軟硬件濾波技術(shu)，使得儀器具有(you)很高(gao)的抗干擾性能(neng)(neng)，測試數據穩(wen)定可靠。

3. 精度高(gao)。基本(ben)誤差(cha)僅0.005Ω，可(ke)用來測量(liang)接地(di)阻抗很小的(de)大型(xing)地(di)網(wang)。

4. 功能強(qiang)大。可測(ce)量(liang)電(dian)流樁(zhuang)，電(dian)壓樁(zhuang)，接(jie)地(di)電(dian)阻，跨步電(dian)壓，接(jie)觸(chu)電(dian)壓。

5. 操(cao)作(zuo)簡單。全中文菜單式操(cao)作(zuo)，直接顯示出(chu)測(ce)量結果(guo)。

6. 布線勞動(dong)量小，無(wu)需大(da)電流線。

結構原理：

本儀器主要由提供測試電(dian)流的異頻電(dian)源、電(dian)流和電(dian)壓(ya)測量電(dian)路以及微電(dian)腦測控系統組成。儀器通過測量接(jie)地裝(zhuang)置(zhi)的電(dian)位升高與(yu)流入接(jie)地裝(zhuang)置(zhi)的電(dian)流之(zhi)比來測量接(jie)地阻抗。

異(yi)頻(pin)(pin)恒流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)可(ke)輸(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)率(lv)為(wei)(wei)45Hz或55Hz的(de)(de)(de)(de)正弦波(bo)測(ce)試(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，輸(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)率(lv)受微(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)腦系(xi)統(tong)控制。其(qi)輸(shu)(shu)出(chu)(chu)(chu)(chu)經過(guo)隔(ge)離(li)后(hou)(hou)通(tong)過(guo)儀器(qi)面板上的(de)(de)(de)(de)C1、C2兩(liang)個(ge)端(duan)子輸(shu)(shu)出(chu)(chu)(chu)(chu)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓放大(da)器(qi)為(wei)(wei)一個(ge)高輸(shu)(shu)入阻(zu)(zu)抗(kang)放大(da)器(qi)，它(ta)將P1、P2兩(liang)端(duan)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓放大(da)后(hou)(hou)送(song)給濾(lv)波(bo)器(qi)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)放大(da)器(qi)將從電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)互感器(qi)取(qu)得的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)信(xin)號(hao)進行放大(da)后(hou)(hou)送(song)給濾(lv)波(bo)器(qi)。濾(lv)波(bo)器(qi)用(yong)于濾(lv)除干擾(rao)信(xin)號(hao)，只允許(xu)45Hz和(he)55Hz信(xin)號(hao)通(tong)過(guo)。A/D轉(zhuan)換器(qi)用(yong)于將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)信(xin)號(hao)轉(zhuan)換為(wei)(wei)數字信(xin)號(hao)以便微(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)腦系(xi)統(tong)進行分(fen)析處理。 用(yong)戶啟動接地阻(zu)(zu)抗(kang)測(ce)量(liang)(liang)后(hou)(hou)，儀器(qi)首先開啟異(yi)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)使之輸(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)率(lv)為(wei)(wei)45Hz的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，待電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)穩定之后(hou)(hou)，微(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)腦系(xi)統(tong)通(tong)過(guo)A/D轉(zhuan)換器(qi)取(qu)得電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)波(bo)形(xing)數據(ju)，進行數字濾(lv)波(bo)后(hou)(hou)計算(suan)出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓V45和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)I45及其(qi)相位(wei)差,再進一步(bu)計算(suan)出(chu)(chu)(chu)(chu)阻(zu)(zu)抗(kang)Z45、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)分(fen)量(liang)(liang)R45和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)(liang)X45。然后(hou)(hou)，切換異(yi)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)(de)(de)(de)輸(shu)(shu)出(chu)(chu)(chu)(chu)頻(pin)(pin)率(lv)為(wei)(wei)55Hz，經過(guo)同樣的(de)(de)(de)(de)步(bu)驟后(hou)(hou)可(ke)計算(suan)出(chu)(chu)(chu)(chu)阻(zu)(zu)抗(kang)Z55、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)分(fen)量(liang)(liang)R55和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)分(fen)量(liang)(liang)X55。取(qu)Z45 和(he)Z55的(de)(de)(de)(de)平(ping)均值作為(wei)(wei)工(gong)頻(pin)(pin)接地阻(zu)(zu)抗(kang)Z50。后(hou)(hou)，關閉(bi)異(yi)頻(pin)(pin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)，通(tong)過(guo)液晶屏(ping)顯示測(ce)量(liang)(liang)結果。因此阻(zu)(zu)抗(kang)測(ce)量(liang)(liang)時，儀器(qi)測(ce)量(liang)(liang)的(de)(de)(de)(de)是兩(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓輸(shu)(shu)入端(duan)P1、P2之間的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)輸(shu)(shu)出(chu)(chu)(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)之比。

• 3A/5A大地網接地電阻測試儀
• 異頻大地網接地電阻測試儀廠家
• 數字大地網接地電阻測試儀
• 程控大型地網接地電阻測試儀
• DWR-3A全自動大地網接地電阻測試儀
• 變頻大地網接地電阻測試儀廠家
• 5A大地網接地電阻測試儀生產廠家
• 廠家供應大地網接地電阻測試儀
• 大型地網接地電阻測試儀
• 3A/5A大地網接地阻抗測試儀