protection n. 1.保護(hù),保衛(wèi),防御,掩護(hù),包庇,照顧 (from; against)。 2.保護(hù)者,防護(hù)物 (against); 〔美俚〕(歹徒向人索取的)保護(hù)費(fèi)。 3.護(hù)照,通行證;〔美國〕(國籍)護(hù)照;通行證。 4. 【經(jīng)濟(jì)學(xué)】保護(hù)貿(mào)易制,保護(hù)政策。 protection against cold 防寒用具。 protection against moths [lightning] 除蟲,避(雷)。 protection at halts 駐軍警戒。 protection on move 行軍警戒。 under the protection of 在…保護(hù)下,受…保護(hù),托…照顧。
The circuit breaker protection with a variety of intelligent function , selective protection , precise movements , we can avoid unnecessary power outages and improve reliability 該斷路器具有多種智能保護(hù)功能,可進(jìn)行選擇性保護(hù)動(dòng)作精確,可避免不必要的停電,提高供電可靠性。
In order to satisfy the requirements of the selective protection to the power network and to increase the production competition , it has important applications to design the intelligent controller that has intellectual function and reasonable price 為了滿足電網(wǎng)選擇性保護(hù)的需要,適應(yīng)市場(chǎng)需求及提高產(chǎn)品競(jìng)爭(zhēng)力,設(shè)計(jì)出保護(hù)功能完善、價(jià)格合理的智能控制器具有重要的應(yīng)用價(jià)值。
This simple , single transport solution lacks the following : end to end protection , non - repudiation , selective protection securing a subset of the message , a robust and flexible authentication mechanism , and provision for message level or end to end secure context 這個(gè)簡(jiǎn)單的、單一的傳輸解決方案缺少下列特征:端到端的保護(hù)、不可抵賴性、選擇性保護(hù)(保護(hù)消息的一部分) 、健壯且靈活的認(rèn)證機(jī)制以及消息級(jí)(或稱端到端)安全上下文的供應(yīng)。
The safety of transmission line plays a important role in power system safety it is not only the requirement of ensure supply power reliability , but also the necessary precondition of enhance power system stabilization , to remove faulty line quickly and accurately , also keep non - faulty line continuous work when some transmission line faults current differential protection is a kind of simple , reliable and good - selective protection manner to any variety of transmission lines , power system development needs current differential protection apply to transmission lines , moreover the advancement of electric and communication technology enable current differential protection apply to transmission lines firstly , the paper discusses , analyses the research and application transmission line protection in detail , compare the principle and realistic presupposition of general line pilot protections secondly , because conventional current vector differential protection are influenced easily by load current and transitional resistance , in order to at the same time quicken protection act , the principle and criterion include work characteristic of differential protect based on fault component sampled values are studied , results shows that differential protect based on fault component sampled values excels general vector current differential protection in reliability , sensitivity and anti - saturation of current transformer in addition , synchronous current sampling methods at all terminals of line is analyzed and estimated lastly , the principle and criterion . also device design about current sampling values differential protection based on optical fiber communication , which apply to short transmission lines are concretely investigated , 基于基爾霍夫定律的電流差動(dòng)保護(hù)無論對(duì)于何種形式的輸電線路都是一種簡(jiǎn)單、可靠、選擇性強(qiáng)的保護(hù)形式,電力系統(tǒng)的發(fā)展使得電流差動(dòng)保護(hù)應(yīng)用于線路保護(hù)成為需要,而電子、通信技術(shù)的發(fā)展使得電流差動(dòng)保護(hù)應(yīng)用于輸電線路成為可能。首先,本文對(duì)目前線路保護(hù)的研究和實(shí)際應(yīng)用情況進(jìn)行了討論和分析,比較了常用線路縱聯(lián)保護(hù)的實(shí)現(xiàn)原理和實(shí)現(xiàn)條件及優(yōu)缺點(diǎn)。其次,針對(duì)常規(guī)相量電流差動(dòng)保護(hù)易受正常負(fù)荷電流和故障過渡電阻影響的缺點(diǎn),同時(shí)為加快差動(dòng)保護(hù)的動(dòng)作速度,對(duì)基于故障分量瞬時(shí)采樣值電流差動(dòng)保護(hù)的原理、判據(jù)、動(dòng)作特性等作了討論和分析,結(jié)果表明基于故障分量瞬時(shí)采樣值電流差動(dòng)保護(hù)在可靠性、靈敏度、抗電流互感器飽和方面明顯優(yōu)于常規(guī)相量電流差動(dòng)保護(hù),對(duì)電流差動(dòng)保護(hù)各端的同步采樣方法和數(shù)據(jù)通信也進(jìn)行了分析和評(píng)價(jià)。