1771-KF2
1771-KF2
1771-KF2
《聯(lián)系人；歐先生》
《座機(jī)：0592-5709825》
《傳真：0592-5917519》
《24小時熱線：18030229053微信同步》
《QQ ：2479261344》
《QQ郵箱：2479261344@qq.com》
當(dāng)負(fù)荷為純電感或純電容時，由于有功電流約等于零，可能會將電感誤判斷為電容或者將電容誤判斷為電感。而負(fù)荷為純電容的狀態(tài)經(jīng)常會出現(xiàn)，例如負(fù)荷為單一大負(fù)荷而負(fù)荷停機(jī)時，無功補(bǔ)償電容器尚在運(yùn)行，于是變壓器二次電流就變?yōu)榧冸娙蓦娏�，如果將這個電流誤判為電感電流，控制器就會繼續(xù)投入電容器，直至將所有的電容器全部投入運(yùn)行，造成嚴(yán)重的過補(bǔ)償現(xiàn)象。
2、顯示器的選擇
最常用的顯示器件就是LED數(shù)碼管，LED數(shù)碼管價格低廉、可靠性高。最好使用多位組合的LED數(shù)碼管，這樣可以大量減少線路板連線并且減少焊接安裝工作量。
很多人比較熱衷于使用液晶顯示器，液晶顯示器可以顯示漢字，在有照明的情況下也比較省電，但是液晶顯示器的最大問題是低溫性能不好，通常在-10℃以下不能正常顯示。所以除非能夠確定控制器的使用環(huán)境溫度在-10℃以上，否則不要使用液晶顯示器。
3、參數(shù)設(shè)定功能
對于以無功電流或無功功率為依據(jù)進(jìn)行控制的無功補(bǔ)償控制器，參數(shù)設(shè)定功能是必備的。
在控制器制造的時候，電容器的額定容量，電流互感器的變比等參數(shù)無法事先確定，只能根據(jù)無功補(bǔ)償裝置的實(shí)際情況及現(xiàn)場情況進(jìn)行設(shè)定，因此控制器必須具備參數(shù)設(shè)定功能。設(shè)定的參數(shù)應(yīng)保證不會因掉電而丟失。
最直接的保存設(shè)定參數(shù)的方法就是使用EEPROM器件，如24C02等。有一些單片機(jī)具有片內(nèi)EEPROM，這樣就可以減少外圍器件數(shù)量。還有一些單片機(jī)具有在應(yīng)用編程功能，也就是說，可以在程序運(yùn)行過程中修改片內(nèi)FLASH程序存儲器的內(nèi)容。對于這類單片機(jī)也可以將設(shè)定參數(shù)保存在FLASH程序存儲器中，不過在應(yīng)用編程的程序設(shè)計(jì)比較復(fù)雜一些。
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