方向功率元件對(duì)三相有功功率作出反應(yīng)，并且對(duì)于同步電機(jī)可是互聯(lián)發(fā)電機(jī)的應(yīng)用為反向功率和低正向功率的應(yīng)用設(shè)計(jì)。繼電器從整套星形或是三角形連接的VT測(cè)量三相功率。對(duì)于后者，使用兩瓦特表法。對(duì)于相關(guān)于方向功率元件中使用的有功和無(wú)功功率的定義參見(jiàn)第六章UR測(cè)量轉(zhuǎn)換部分。功方向1(2)靈敏角:為繼電器方向功率功能指定特征角。該定值有三種應(yīng)用:1.它允許元件在任意方向上反應(yīng)有功功率和無(wú)功功率(有功高功率1無(wú)功低功率，等等)。

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