描述
可靠性是指保護該動體時應(yīng)可靠動作。不該動作時應(yīng)可靠不動作?？煽啃允菍^電保護裝置性能的最根本的要求。
選擇性是指首先由故障設(shè)備或線路本身的保護切除故障，當故障設(shè)備或線路本身的保護或斷路器拒動時，才允許由相鄰設(shè)備保護、線路保護或斷路器失靈保護切除故障。為保證對相鄰設(shè)備和線路有配合要求的保護和同一保護內(nèi)有配合要求的兩元件（如啟動與跳閘元件或閉鎖與動作元件）的選擇性，其靈敏系數(shù)及動作時間，在一般情況下應(yīng)相互配合。
靈敏性是指在設(shè)備或線路的被保護范圍內(nèi)發(fā)生金屬性短路時，保護裝置應(yīng)具有必要的靈敏系數(shù)，各類保護的最小靈敏系數(shù)在規(guī)程中有具體規(guī)定。選擇性和靈敏性的要求，通過繼電保護的整定實現(xiàn)。
速動性是指保護裝置應(yīng)盡快地切除短路故障，其目的是提高系統(tǒng)穩(wěn)定性，減輕故障設(shè)備和線路的損壞程度，縮小故障波及范圍，提高自動重合閘和備用電源或備用設(shè)備自動投入的效果等。一般從裝設(shè)速動保護（如高頻保護、差動保護）、充分發(fā)揮零序接地瞬時段保護及相間速斷保護的作用、減少繼電器固有動作時間和斷路器跳閘時間等方面入手來提高速動性。
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