漏電保護器的作用：

Function of leakage protector:

漏電保護器又稱“過電流保護器（RCD）”，是一種在正常條件下，當(dāng)漏電流（剩余電流）達(dá)到或超過規(guī)定值時，能主動斷開電路的一種電路。電器維修。用于保護低壓配電系統(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.

漏電保護器的原理:

Principle of leakage protector:

漏電保護器按其響應(yīng)動作的信號分為電壓動作型和電流動作型兩種。電壓動作型存在一些技術(shù)問題，所以現(xiàn)在生產(chǎn)的漏電保護器幾乎都是電流動作型。電流動作型漏電保護器使用零序電流互感器來反映接地缺陷電流以作用于脫扣機構(gòu)。按脫扣機構(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)備正常運行時，PE線無電流，通過零序電流互感器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)電動勢，極化電磁鐵YA的線圈中沒有電流，其銜鐵靠永磁體的磁力保持在吸合位置，使開關(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，PE線有電流流過，通過零序電流互感器TAN的電流相量和不再為零，有一個零-序電流通過變壓器TAN的鐵芯，在次級側(cè)產(chǎn)生感應(yīng)電動勢，所以電磁鐵有交流電通過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，使安全跳閘機構(gòu)YR動作，開關(guān)跳閘，斷開有缺陷的電路，從零序電流互感器檢測到漏電信號到故障電路排除的整個動作時間一般在0.1秒，有效起到漏電保護的作用。

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，變壓器二次側(cè)感應(yīng)的電信號TAN經(jīng)電子放大器AV放大后，接通跳閘機構(gòu)YR，使開關(guān)跳閘，然后也動作作為漏電流。

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.

漏電保護器功能檢測:

Leakage protector function detection:

為了經(jīng)常檢查漏電保護器的動作功能，漏電保護器配有實驗按鈕。漏電保護器開關(guān)閉合后，按下實驗按鈕SB，假設(shè)開關(guān)斷開，證明漏電保護器正常。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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