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漏电保护器的作用原理及功能解答

来源:http://www.jntongyu.com/ 日期:2022-05-25 发布人:tongjid

漏电保护器的作用:
Function of leakage protector:
漏电保护器又称“过电流保护器(RCD)”,是一种在正常条件下,当漏电流(剩余电流)达到或超过规定值时,能主动断开电路的一种电路。电器维修。用于保护低压配电系统中的漏电和接地缺陷,避免因接地电弧引起的人身触电和火灾。
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.
漏电保护器的原理:
Principle of leakage protector:
漏电保护器按其响应动作的信号分为电压动作型和电流动作型两种。电压动作型存在一些技术问题,所以现在生产的漏电保护器几乎都是电流动作型。电流动作型漏电保护器使用零序电流互感器来反映接地缺陷电流以作用于脱扣机构。按脱扣机构的结构分为电磁脱扣式和电子脱扣式两种。
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.
设备正常运行时,PE线无电流,通过零序电流互感器TAN的电流相量和为零,零序电流互感器TAN二次侧不产生感应电动势,极化电磁铁YA的线圈中没有电流,其衔铁靠永磁体的磁力保持在吸合位置,使开关保持在闭合状态。
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.
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当设备有漏电,有人触碰或产生单相接地缺陷时,PE线有电流流过,通过零序电流互感器TAN的电流相量和不再为零,有一个零-序电流通过变压器TAN的铁芯,在次级侧产生感应电动势,所以电磁铁有交流电通过YA的线圈.
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
在其铁芯中产生交变磁通,与原磁通叠加产生退磁作用,然后电磁吸引力降低,衔铁被弹簧甩开,使安全跳闸机构YR动作,开关跳闸,断开有缺陷的电路,从零序电流互感器检测到漏电信号到故障电路排除的整个动作时间一般在0.1秒,有效起到漏电保护的作用。
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.
电子跳闸式漏电保护器使用电子放大器AV代替极化电磁铁YA。当设备有漏电或单相接地缺陷时,变压器二次侧感应的电信号TAN经电子放大器AV放大后,接通跳闸机构YR,使开关跳闸,然后也动作作为漏电流。
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.
漏电保护器功能检测:
Leakage protector function detection:
为了经常检查漏电保护器的动作功能,漏电保护器配有实验按钮。漏电保护器开关闭合后,按下实验按钮SB,假设开关断开,证明漏电保护器正常。一般应每月检查一次。
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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