漏電保護(hù)器的作用：

Function of leakage protector:

漏電保護(hù)器又稱“過(guò)電流保護(hù)器（RCD）”，是一種在正常條件下，當(dāng)漏電流（剩余電流）達(dá)到或超過(guò)規(guī)定值時(shí)，能主動(dòng)斷開(kāi)電路的一種電路。電器維修。用于保護(hù)低壓配電系統(tǒng)中的漏電和接地缺陷，避免因接地電弧引起的人身觸電和火災(zāi)。

Leakage protector, also known as "overcurrent protector (RCD)", is a circuit that can actively disconnect the circuit when the leakage current (residual current) reaches or exceeds the specified value under normal conditions. Electrical maintenance. It is used to protect leakage and grounding defects in low-voltage distribution system and avoid personal electric shock and fire caused by grounding arc.

漏電保護(hù)器的原理:

Principle of leakage protector:

漏電保護(hù)器按其響應(yīng)動(dòng)作的信號(hào)分為電壓動(dòng)作型和電流動(dòng)作型兩種。電壓動(dòng)作型存在一些技術(shù)問(wèn)題，所以現(xiàn)在生產(chǎn)的漏電保護(hù)器幾乎都是電流動(dòng)作型。電流動(dòng)作型漏電保護(hù)器使用零序電流互感器來(lái)反映接地缺陷電流以作用于脫扣機(jī)構(gòu)。按脫扣機(jī)構(gòu)的結(jié)構(gòu)分為電磁脫扣式和電子脫扣式兩種。

Leakage protector can be divided into voltage action type and current action type according to its response signal. There are some technical problems with voltage operated type, so the leakage protectors produced now are almost all current operated type. The current operated leakage protector uses zero sequence current transformer to reflect the grounding defect current and act on the tripping mechanism. According to the structure of the tripping mechanism, it is divided into electromagnetic tripping type and electronic tripping type.

設(shè)備正常運(yùn)行時(shí)，PE線無(wú)電流，通過(guò)零序電流互感器TAN的電流相量和為零，零序電流互感器TAN二次側(cè)不產(chǎn)生感應(yīng)電動(dòng)勢(shì)，極化電磁鐵YA的線圈中沒(méi)有電流，其銜鐵靠永磁體的磁力保持在吸合位置，使開(kāi)關(guān)保持在閉合狀態(tài)。

During normal operation of the equipment, the PE line has no current, and the sum of the current phasor passing through the zero sequence current transformer Tan is zero. The secondary side of the zero sequence current transformer Tan does not generate induced electromotive force, and there is no current in the coil of the polarization electromagnet ya. Its armature is kept in the pull-in position by the magnetic force of the permanent magnet to keep the switch closed.

當(dāng)設(shè)備有漏電，有人觸碰或產(chǎn)生單相接地缺陷時(shí)，PE線有電流流過(guò)，通過(guò)零序電流互感器TAN的電流相量和不再為零，有一個(gè)零-序電流通過(guò)變壓器TAN的鐵芯，在次級(jí)側(cè)產(chǎn)生感應(yīng)電動(dòng)勢(shì)，所以電磁鐵有交流電通過(guò)YA的線圈.

When the equipment has leakage, someone touches or single-phase grounding defect, the PE line has current flow, and the sum of current phasor passing through the zero sequence current transformer Tan is no longer zero. A zero sequence current passes through the iron core of transformer Tan and generates induced electromotive force on the secondary side, so the electromagnet has alternating current passing through the coil of ya

在其鐵芯中產(chǎn)生交變磁通，與原磁通疊加產(chǎn)生退磁作用，然后電磁吸引力降低，銜鐵被彈簧甩開(kāi)，使安全跳閘機(jī)構(gòu)YR動(dòng)作，開(kāi)關(guān)跳閘，斷開(kāi)有缺陷的電路，從零序電流互感器檢測(cè)到漏電信號(hào)到故障電路排除的整個(gè)動(dòng)作時(shí)間一般在0.1秒，有效起到漏電保護(hù)的作用。

Alternating magnetic flux is generated in its iron core, which is superimposed with the original magnetic flux to produce demagnetization, and then the electromagnetic attraction is reduced. The armature is thrown away by the spring to make the safety tripping mechanism yr act, the switch trips and disconnect the defective circuit. The whole action time from the detection of leakage signal by zero sequence current transformer to the elimination of the fault circuit is generally 0.1 seconds, which effectively plays the role of leakage protection.

電子跳閘式漏電保護(hù)器使用電子放大器AV代替極化電磁鐵YA。當(dāng)設(shè)備有漏電或單相接地缺陷時(shí)，變壓器二次側(cè)感應(yīng)的電信號(hào)TAN經(jīng)電子放大器AV放大后，接通跳閘機(jī)構(gòu)YR，使開(kāi)關(guān)跳閘，然后也動(dòng)作作為漏電流。

Electronic tripping leakage protector uses electronic amplifier AV instead of polarized electromagnet ya. When the equipment has leakage or single-phase grounding defects, the electrical signal Tan induced at the secondary side of the transformer is amplified by the electronic amplifier AV, and then the tripping mechanism yr is connected to trip the switch, and then it also acts as leakage current.

漏電保護(hù)器功能檢測(cè):

Leakage protector function detection:

為了經(jīng)常檢查漏電保護(hù)器的動(dòng)作功能，漏電保護(hù)器配有實(shí)驗(yàn)按鈕。漏電保護(hù)器開(kāi)關(guān)閉合后，按下實(shí)驗(yàn)按鈕SB，假設(shè)開(kāi)關(guān)斷開(kāi)，證明漏電保護(hù)器正常。一般應(yīng)每月檢查一次。

In order to frequently check the action function of the leakage protector, the leakage protector is equipped with an experimental button. After the leakage protector switch is closed, press the test button sb, assuming that the switch is disconnected, it proves that the leakage protector is normal. Generally, it should be checked once a month.

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