安科瑞(ruì) 鮑靜(jìng)君

ASJ series Residual Current Action Relay

　　1. 概(gài)述

　　Overview

　　在工(gōng)業應(yīng)用中，剩餘電(diàn)流繼(jì)電(diàn)器(qì)與外部剩(shèng)餘電(diàn)流互(hù)感器結合使用(yòng)以檢測和(hé)評(píng)估(gū)接地故障電流(liú)。它們(mén)也(yě)可以(yǐ)與保(bǎo)護裝(zhuāng)置結(jié)合使用，以(yǐ)實(shí)現電路的斷開，從而(ér)實現對綫路(lù)和人(rén)員的(dí)保護。

　　Residual current relay can be combined with external residual current transformer to detect and evaluate the ground fault current. They can also be combined with protective devices to realize the disconnection of circuits and the protection of lines and workers.

　　2.剩餘電(diàn)流的(dí)定義(yì)以(yǐ)及(jí)危害(hài)

　　Definition and risk of residual current

　　剩餘電流，是指(zhǐ)低(dī)壓(yā)配電(diàn)綫(xiàn)路中(zhōng)各相(xiāng)(含中(zhōng)性綫(xiàn))電流(liú)矢(shǐ)量和不(bù)為零的電流(liú)。通俗講當(dāng)用電(diàn)側發生了事故(gù),電流從帶電體通過人(rén)體流到(dào)大地,使(shǐ)主(zhǔ)電路進出綫(xiàn)中的電流I相(xiāng)和I中(zhōng)的大(dà)小不(bù)相等(děng),此時電(diàn)流(liú)的(dí)瞬時矢量(liáng)合成有效(xiào)值(zhí)稱為剩餘電流(liú)，俗(sú)稱(chēng)漏電(diàn)。

　　Residual current is the current vector sum of each phase (including the neutral ) in the low-voltage distribution that not be zero. Generally, when there is an accident on the power side, the current flows from the charged body to the earth through the human body,it will cause that the current phase I in the main circuit not equal to the size in phase I. At this time, the value of instantaneous current vector synthesis is called residual current, commonly known as leakage.

　　TN System

　　3.剩餘(yú)電流的危害：

　　Risk of residual current:

　　人(rén)身觸電(diàn)。當電氣設備因絕(jué)緣損(sǔn)壞而(ér)使(shǐ)外(wài)殼帶(dài)電(diàn)，而工(gōng)作人(rén)員又(yòu)接觸此(cǐ)外殼時，就會導(dǎo)致(zhì)人身觸電(diàn)事故(gù)。

　　（1）Physical electric shock. When shell of the electrical equipment is electrified due to insulation damage, and the workers touch the shell again, it will lead to physical electric shock accident.

　　燒損電(diàn)氣設(shè)備(bèi)，引起火災(zāi)。長期存(cún)在的(dí)漏電(diàn)電流，尤(yóu)其是兩(liǎng)相(xiāng)經(jīng)過電(diàn)阻接(jiē)地(dì)的漏(lòu)電(diàn)電(diàn)流，在通過設(shè)備絕緣(yuán)損壞處時將(jiāng)散發出(chū)大(dà)量(liáng)的(dí)熱(rè)，使絕緣(yuán)進一步(bù)損(sǔn)壞，甚至(zhì)使可燃(rán)性(xìng)材(cái)料(liào)（如非(fēi)阻燃性橡(xiàng)套(tào)電纜(lǎn)）著火(huǒ)燃(rán)燒。

　　Burn electrical equipment and cause fire. The long-term leakage current, especially the leakage current of  two-phase grounded through resistance, will release a lot of heat when flow through the damaged part of the equipment insulation, further damaging the insulation, and even making combustible materials (such as non flame retardant rubber sheathed cable) burn on fire.

　　引起短路(lù)事(shì)故。據統計，約有30%的(dí)單相接地(dì)故障發(fā)展為短(duǎn)路。從(cóng)而(ér)造成更大的電(diàn)氣(qì)故(gù)障(zhàng)。長期(qī)存在(zài)的(dí)漏(lòu)電(diàn)電流及電(diàn)火花(huā)使(shǐ)漏電處的(dí)絕(jué)緣進一步損壞，後危及(jí)相(xiāng)間絕緣而造(zào)成短路。

　　(3) Cause short circuit accident. According to statistics, about 30% of single-phase grounded faults develop into short circuit which will give rise to heavier electrical failure. The long-term leakage current and spark further damage the insulation at the leakage point, and finally endanger the interphase insulation and cause short circuit.

　　引起電氣火災(zāi)事故(gù)。電(diàn)網(wǎng)發生(shēng)單相接(jiē)地或(huò)設(shè)備發生單相碰殼(ké)時(shí)，在(zài)接地點(diǎn)就會產生電(diàn)火(huǒ)花(huā)，若此電火花具有(yǒu)足(zú)夠(gòu)的能量(liáng)，就可能(néng)點燃易(yì)燃易爆(bào)物品(pǐn)。

　　Cause electrical fire accident. When the single-phase grounding occurs in the power grid or the single-phase collision occurs in the equipment, the electric spark will be generated at the grounding point. If the electric spark has enough energy, it may ignite flammable and explosive materials.

　　4.如何測(cè)剩餘(yú)電流(liú)

　　How to measure residual current

　　在被測(cè)的(dí)三(sān)相導(dǎo)綫(xiàn)路(lù)上與(yǔ)N綫上各(gè)裝一(yī)個CT，或讓(ràng)三相(xiāng)導(dǎo)綫與N綫一起穿過(guò)一(yī)個零(líng)序CT，得到三相(xiāng)導綫(xiàn)與(yǔ)中(zhōng)性綫(xiàn)N的電流(liú)矢量和(hé)IA*+IB*+IC*+IN*，當沒(méi)有(yǒu)發生單(dān)相(xiāng)接(jiē)地故障時，無論三(sān)相(xiāng)負荷(hé)平(píng)衡(héng)與否，則(zé)此(cǐ)矢(shǐ)量和(hé)為零；當發生某(mǒu)一(yī)相接(jiē)地(dì)故(gù)障時，故障電流中(zhōng)會(huì)通(tōng)過(guò)保護PE及(jí)與地(dì)相關(guān)連的(dí)金屬構(gòu)件回到電源，即IA*+IB*+IC*+IN*，此時(shí)數(shù)值為(wéi)接地故障(zhàng)電流(liú)Id。

　　Installing a CT on each of the three-phase conducting lines to be tested and N line or let the three-phase conductor and the n-line pass through a zero sequence CT together to get the current vector sum IA * + IB * + IC * + IN * . when there is no single-phase grounded fault, whether the three-phase load is balanced or not, the vector sum is zero; when there is a phase grounded fault, the fault current will flow through the protection PE and the metal components connected to the earth to the power supply, at this time, the value is the ground fault current Id.

　　5.ASJ係列剩(shèng)餘電流動作繼(jì)電(diàn)器

　　ASJ series residual current operated relay

　　ASJ係列(liè)剩(shèng)餘(yú)電(diàn)流動作繼電器(qì)可與低(dī)壓(yā)斷(duàn)路(lù)器或低壓(yā)接觸器(qì)等(děng)組成組(zǔ)合式(shì)剩餘(yú)電(diàn)流保護裝置， 主(zhǔ)要(yào)適(shì)用於(yú)交流(liú) 50Hz， 額定電(diàn)壓 400V 及以下的(dí) TT 和(hé) TN 係(xì)統(tǒng)配(pèi)電(diàn)綫(xiàn)路， 用(yòng)來對電(diàn)氣綫(xiàn)路(lù)進(jìn)行(háng)接地故障保(bǎo)護， 防止(zhǐ)接地故(gù)障電(diàn)流引起的設備損(sǔn)壞和(hé)電(diàn)氣(qì)火災事故， 也可用來對(duì)人(rén)身(shēn)觸電危險提供間(jiān)接接(jiē)觸保護。

　　ASJ series residual current action relay can be combined with low voltage circuit breaker or low voltage contactor to form a combined residual current protection device.It is mainly used for TT and TN system distribution lines with AC 50Hz and rated voltage of 400V and below.It is used to protect the electrical circuit from ground faults, prevent equipment damage caused by ground fault current and electrical fire accidents, and can also be used to provide indirect contact protection against personal electric shock hazard

　　參考文(wén)獻 Bibliography

　　1.Solutions For Enterprise Micro-grid System 2020.02