- 商品名稱：PT01C 電壓互感器
- 添加時間：2020-05-11 15:06:08
介紹：
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產品說明: |
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型號：PT01C
一、 產品特點
1、PBT外殼，耐高溫，耐腐蝕；
2、環氧樹脂灌封，隔離性能好，抗沖擊性強；
3、體積小，外形美觀，插針式直接焊接線路板；
4、線性范圍寬，一致性好。
二、 型號定義
三、性能指標
四、外形及引腳圖（單位：mm） PT01/PT03實際上是一款毫安級jing.mi電(dian)(dian)(dian)(dian)壓(ya)互感(gan)器（電(dian)(dian)(dian)(dian)流(liu)型電(dian)(dian)(dian)(dian)壓(ya)互感(gan)器），輸入(ru)額定(ding)電(dian)(dian)(dian)(dian)流(liu)為(wei)2mA，額定(ding)輸出電(dian)(dian)(dian)(dian)流(liu)為(wei)2mA。用(yong)(yong)戶使用(yong)(yong)時(shi)需要將(jiang)電(dian)(dian)(dian)(dian)壓(ya)信(xin)號變換成電(dian)(dian)(dian)(dian)流(liu)信(xin)號，推薦使用(yong)(yong)電(dian)(dian)(dian)(dian)路如圖1所示。圖1中(zhong)，R'是(shi)限(xian)流(liu)電(dian)(dian)(dian)(dian)阻，不論額(e)定(ding)(ding)輸(shu)入電(dian)(dian)(dian)(dian)壓(ya)多大(da)，調(diao)整(zheng)R'的(de)(de)(de)值，使(shi)額(e)定(ding)(ding)輸(shu)入電(dian)(dian)(dian)(dian)流(liu)為2mA，就(jiu)滿足使(shi)用條件。副邊(bian)電(dian)(dian)(dian)(dian)路是(shi)電(dian)(dian)(dian)(dian)流(liu)/電(dian)(dian)(dian)(dian)壓(ya)變換電(dian)(dian)(dian)(dian)路，當需要(yao)(yao)電(dian)(dian)(dian)(dian)壓(ya)輸(shu)出(chu)時(shi)采用。調(diao)整(zheng)圖中(zhong)反(fan)饋電(dian)(dian)(dian)(dian)阻R和(he)(he)r的(de)(de)(de)值可得到(dao)所(suo)需要(yao)(yao)的(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)輸(shu)出(chu)。電(dian)(dian)(dian)(dian)容(rong)C1及可調(diao)電(dian)(dian)(dian)(dian)阻r'是(shi)用來(lai)補償相移(yi)的(de)(de)(de)。建(jian)議(yi)R取(qu)(qu)Vo/0.002,r取(qu)(qu)R/10，C1取(qu)(qu)值約為65/R（μF）, r '取(qu)(qu)200kΩ 。電(dian)(dian)(dian)(dian)容(rong)C2和(he)(he)C3是(shi)400至1000pF的(de)(de)(de)小電(dian)(dian)(dian)(dian)容(rong)，用來(lai)去耦和(he)(he)濾波。兩個(ge)反(fan)接(jie)的(de)(de)(de)二極管是(shi)起(qi)保護運算(suan)放大(da)器(qi)(qi)作用的(de)(de)(de)。運算(suan)放大(da)器(qi)(qi)視精(jing)度要(yao)(yao)求(qiu)使(shi)用，推(tui)薦使(shi)用OP07系列，使(shi)用性能(neng)較好的(de)(de)(de)運算(suan)放大(da)器(qi)(qi)較容(rong)易達到(dao)較高(gao)的(de)(de)(de)精(jing)度和(he)(he)較好的(de)(de)(de)穩(wen)定(ding)(ding)性。運算(suan)放大(da)器(qi)(qi)電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)通常取(qu)(qu)+15V或+12V，也可根據具體情(qing)況自定(ding)(ding)。圖1中(zhong)電(dian)阻(zu)R和(he)R'要(yao)求精度(du)優(you)于(yu)(yu)1%, 溫度(du)系(xi)數優(you)于(yu)(yu)50PPM，R ' 的(de)功率要(yao)求有2 倍的(de)余量。用(yong)戶使用(yong)推(tui)薦電(dian)路稍加改動(dong)也可(ke)構成單電(dian)源(yuan)供(gong)電(dian)模式(shi)，適用(yong)于(yu)(yu)單極性(xing)A/D轉換(huan)器的(de)輸入(ru)。額定輸入(ru)電(dian)流也可(ke)以(yi)選為1mA以(yi)降低功耗或5mA以(yi)減小相移，非線性(xing)度(du)仍優(you)于(yu)(yu)0.1%。五、使用方法
PT01/PT03次級如不加運算放大器而直接并聯一個電阻使輸出變換成電壓信號也是可以的。使用電路如圖2所示，前提是電阻要小于400Ω，輸出電壓大1伏，這時仍能得到非線性度優于0.1%的輸出電壓信號。和推薦電路比較，其影響如下：1.縮小了互感器的動態范圍。2.使相移增大。
PT02實際上是一款電壓型jing.mi電壓互感器，將電壓信號隔離變換成適當的電壓信號，額定輸入電壓通常有100V、450V等，額定輸出電壓通常4V、7.07V等，還可根據客戶要求另行設計，后面可不處理直接接A/D采樣電路 。 |
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