安科(kē)瑞(ruì) 陳聰

ASJ series Residual Current Action Relay

1. 概(gài)述(shù)

Overview

在工業應(yīng)用(yòng)中(zhōng)，剩(shèng)餘電流(liú)繼電器與外部剩餘(yú)電(diàn)流互感(gǎn)器結(jié)合(hé)使(shǐ)用以(yǐ)檢(jiǎn)測和(hé)評(píng)估接地(dì)故障電(diàn)流。它(tā)們也(yě)可以與保護裝(zhuāng)置結(jié)合使(shǐ)用(yòng)，以(yǐ)實(shí)現電(diàn)路的(dí)斷開，從(cóng)而(ér)實(shí)現對(duì)綫(xiàn)路(lù)和人(rén)員的(dí)保護(hù)。

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(shèng)餘(yú)電(diàn)流(liú)的定義以及(jí)危害

Definition and risk of residual current

剩餘電(diàn)流(liú)，是指低(dī)壓(yā)配電(diàn)綫(xiàn)路中(zhōng)各相(xiāng)(含中性(xìng)綫)電(diàn)流(liú)矢(shǐ)量和(hé)不(bù)為零(líng)的電(diàn)流。通俗(sú)講當(dāng)用(yòng)電(diàn)側發(fā)生了事(shì)故(gù),電流從帶(dài)電(diàn)體通過人(rén)體(tǐ)流到(dào)大地,使主電(diàn)路(lù)進(jìn)出(chū)綫(xiàn)中的電流(liú)I相(xiāng)和I中的大(dà)小不(bù)相等,此時(shí)電流的(dí)瞬時矢量(liáng)合成(chéng)有(yǒu)效值稱為(wéi)剩餘電流，俗稱(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(dí)危害(hài)：

Risk of residual current:

人身觸電(diàn)。當電(diàn)氣(qì)設備(bèi)因(yīn)絕緣(yuán)損壞而使外殼(ké)帶電，而工(gōng)作(zuò)人員又接觸此(cǐ)外殼時，就會(huì)導(dǎo)致人身觸(chù)電事(shì)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(sǔn)電(diàn)氣(qì)設備，引(yǐn)起火(huǒ)災。長期存在(zài)的漏(lòu)電電流，尤其是兩相經過(guò)電阻接地的(dí)漏電電(diàn)流，在(zài)通過設備絕緣(yuán)損(sǔn)壞處時將散(sàn)發出大(dà)量的(dí)熱，使絕緣進(jìn)一步損(sǔn)壞，甚至使可燃性材料(liào)（如非(fēi)阻(zǔ)燃性(xìng)橡套電纜）著火(huǒ)燃燒(shāo)。

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(yǐn)起短路(lù)事故。據統計，約(yuē)有30%的(dí)單相(xiāng)接(jiē)地故(gù)障(zhàng)發(fā)展(zhǎn)為短路。從而(ér)造成更大的電(diàn)氣故障(zhàng)。長期存(cún)在(zài)的漏電電(diàn)流(liú)及(jí)電火花使(shǐ)漏電處的絕緣進(jìn)一(yī)步損壞(huài)，後危及相間(jiān)絕緣(yuán)而(ér)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(qǐ)電氣(qì)火災事(shì)故。電(diàn)網發生單相接地(dì)或(huò)設備發生單相(xiāng)碰殼(ké)時，在接(jiē)地(dì)點就會產(chǎn)生電火(huǒ)花，若(ruò)此電(diàn)火(huǒ)花具(jù)有(yǒu)足夠的能量，就(jiù)可能點(diǎn)燃(rán)易(yì)燃(rán)易爆物品(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.如何測剩(shèng)餘電流(liú)

How to measure residual current

在被測的三相(xiāng)導綫路(lù)上(shàng)與N綫(xiàn)上各裝一(yī)個(gè)CT，或讓三(sān)相(xiāng)導(dǎo)綫(xiàn)與N綫(xiàn)一起穿過一(yī)個(gè)零序(xù)CT，得到(dào)三相導綫(xiàn)與(yǔ)中(zhōng)性(xìng)綫N的(dí)電流(liú)矢量和(hé)IA*+IB*+IC*+IN*，當(dāng)沒有發生單相接地(dì)故障時，無論三(sān)相(xiāng)負(fù)荷(hé)平(píng)衡與否，則此矢量和為零；當發(fā)生某一相接地(dì)故障(zhàng)時，故(gù)障電(diàn)流(liú)中會通(tōng)過(guò)保(bǎo)護PE及與地相關(guān)連(lián)的金屬(shǔ)構件(jiàn)回(huí)到電源，即IA*+IB*+IC*+IN*，此(cǐ)時(shí)數值(zhí)為接地(dì)故障(zhàng)電流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(xì)列剩(shèng)餘電流動(dòng)作繼電器

ASJ series residual current operated relay

ASJ係列剩餘電(diàn)流動(dòng)作繼(jì)電(diàn)器可與(yǔ)低壓(yā)斷(duàn)路器或(huò)低壓(yā)接觸(chù)器(qì)等組成(chéng)組合式(shì)剩(shèng)餘電流保(bǎo)護裝置(zhì)， 主(zhǔ)要(yào)適(shì)用(yòng)於交流(liú) 50Hz， 額(é)定電壓 400V 及(jí)以下的(dí) TT 和(hé) TN 係統配(pèi)電綫路， 用來對電氣(qì)綫路進(jìn)行接地故障(zhàng)保護(hù)， 防(fáng)止(zhǐ)接(jiē)地故障電(diàn)流(liú)引(yǐn)起的(dí)設備損壞和電氣(qì)火災事(shì)故(gù)， 也(yě)可用(yòng)來對人(rén)身(shēn)觸電危(wēi)險(xiǎn)提供間接(jiē)接(jiē)觸(chù)保(bǎo)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

參考文獻(xiàn) Bibliography

1.Solutions For Enterprise Micro-grid System 2020.02