描述
可靠性是指保護(hù)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(hù)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(hù)切除故障,當(dāng)故障設(shè)備或線路本身的保護(hù)或斷路器拒動時,才允許由相鄰設(shè)備保護(hù)、線路保護(hù)或斷路器失靈保護(hù)切除故障。為保證對相鄰設(shè)備和線路有配合要求的保護(hù)和同一保護(hù)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(hù)范圍內(nèi)發(fā)生金屬性短路時,保護(hù)裝置應(yīng)具有必要的靈敏系數(shù),各類保護(hù)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(hù)的整定實現(xiàn)。
速動性是指保護(hù)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(hù)(如高頻保護(hù)、差動保護(hù))、充分發(fā)揮零序接地瞬時段保護(hù)及相間速斷保護(hù)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。
產(chǎn)品承
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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ASYST TEACH PENDANT ROBOT CONTROLLER 8045R2
ANGLE VALVE VAT PNEUMATIQUE ALU DN40 – REFURBISHED
TELEMECANIQUE ABE7 INPUT – REFURBISHED
POWER SUPPLY MDP FIRST DC 1Q 50/5 – REFURBISHED
SET OF 5 SWILL WAFER SUPPORT PIN-ENP PN 0200-00581 -NEW
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SET OF 17 ORING ID 10.178 CDS.112.SILICON?E 3700-02952
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0010-14390 AMAT BRUSH MODULE EXTENDED ROLLER- NEW
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ALCATEL PTM5101 TURBO CERAMIC PUMP – REFURBISHED
MINI VACUUM PRESSURE SWITCH 41A11DGA2AA002 -REFURBISHED
TURBO PUMP CONTROLLER CFV900 – REFURBISHED
VALVE VERIFLO 944L. NEW
GAS PRESSURE REGULATOR TESCOM 44-2361-T9-051 – NEW
90 DEGREES VACUUM ELBOW ISO100-KF – REFURBISHED
90 DEGREES VACUUM ELBOW ISO160-KF – REFURBISHED
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A&N CORPORATION P/N: LF63-300-F
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PRESSURE REDUCING GAUGE VERIFLO PARKER NPR73530W4PXFSM
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DC MOTOR ASS AG-SCHWEIZ 84031-R1 – REFURBISHED
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PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家