Single leakage protector, leakage protector selection

I have encountered this situation you said, the zero line from the transformer to disconnect the leakage protector will not trip (the reason is that the leakage protector itself needs the live wire zero line to work, see the relevant instructions for details), the home may indeed appear 380 voltage, that is because from the transformer is three-phase electricity, divided to different branches, but the total zero line is common once it is disconnected, between the different phase wires and the phase wires can be through the running electrical appliances to form a loop, That is to say, the line voltage of 380V will be divided into two different electrical appliances (at this time, the electrical appliances are equivalent to being connected in series between two phase wires), but the resistance value of each electrical appliance is different, and the voltage shared by each electrical appliance is different, so theoretically speaking, some electrical appliances can still work normally at this time (when the voltage shared by them is close to the normal value). If all the loads coming out of the transformer can be disconnected, the voltage between the live wire and the neutral wire will be 0 (in fact, at this time, the live wire and the neutral wire are connected through the windings of the electrical appliances and other equivalent to a phase wire).

A few people upstairs didn't know much.

If the neutral line of the single-phase line is broken, it will not trip. It's common sense.

If the neutral line is broken behind the protector, if there is an electrical leakage, according to the principle of leakage protection, it will still trip, but if it is broken before the protector, it will not trip regardless of leakage or not.

If the main neutral line of the three-phase line is broken, the voltage may reach the line voltage at the highest. However, if the single-phase line is broken off the neutral line, the voltage will be lost.

Just ask the one on the first floor, the moment the electrical appliances are turned on, "the current flows out, but it doesn't come back", what about the current flowing to **? How is the loop formed?

Electrical safety is related to the safety of people, life and equipment, and you can't rely on random guessing.

The leakage protector is to protect the equipment below the leakage current, if the neutral line is broken from the transformer, the leakage protector will not trip, and there is another point, the voltage is not 380 at this time, because the three-phase electricity we use refers to the three-phase sinusoidal alternating current, and the voltage between the lines is 380V, that is, the voltage between the three live wires is 380V, and the 220V we say refers to the voltage between one of the live wires and the neutral line. If we are electrocuted, it is only the voltage between the earth and the live wire, so it is only 220V, and if your body touches two live wires at the same time, or if one of the live wires falls on the ground or conductor near you at this time, the voltage applied to your body at this time is 380V.

If there is an electrical appliance turned on, it will trip. It's very simple, the current goes out and doesn't come back, isn't it just leaking?

The so-called "residual current protection" is actually leakage protection, which refers to the current that is "generated" without passing through the power supply circuit, which is the residual current, so these two leakage protectors are the same, but their "nominal" names are different.

Summary. Hello! Distinguish the wiring of the leakage protector is two wires into and two wires out.

This is called 2 poles, that is, 2p (not horses, but poles). According to the national standard [installation and operation of leakage protectors], the electrical equipment supplied by the single-phase 220V power supply can be equipped with two-pole two-wire or single-pole two-wire leakage protectors. The single-pole two-wire leakage protector only has live wire protection (single-pole protection), and the live wire is cut off in case of failure, and the other wire is still normal at this time; The wiring is two wires in and two wires out.

The two-pole two-wire leakage protector is equipped with live wire and neutral line protection (bipolar protection). In case of failure, cut off the live wire and the neutral line together. The wiring is also two wires in and two wires out.

Hello! Distinguish the wiring of the leakage protector is two wires into and two wires out. This is called 2 poles, that is, 2p (not horses, but poles).

According to the national standard [installation and operation of leakage protectors], the electrical equipment supplied by the single-phase 220V power supply can be equipped with two-pole two-envy seepage line or single-pole two-wire leakage protector or vibrato. The single-pole two-wire leakage protector only has live wire protection (single-pole protection), and the live wire is cut off in case of failure, and the other wire is still normal at this time; The wiring is two wires in and two wires out. The two-pole two-wire leakage protector is equipped with live wire and neutral line protection (bipolar protection).

In case of failure, cut off the live wire and the neutral line together. The wiring is also two wires in and two wires out.

Can you add, I don't quite understand it.

The wiring of the leakage protector is two wires in and two wires out. This is called 2 poles, that is, 2p (not horses, but poles). According to the national pin lifting standard [installation and operation of leakage protector], the electrical equipment supplied by the single-phase 220V power supply can be equipped with a two-pole two-wire or single-pole two-wire leakage protector.

The single-pole two-wire leakage protector only has live wire protection (single-pole protection), and the live wire is cut off in case of failure, and the other line is still normal at this time; The wiring is two wires in and two wires out. The two-pole two-wire leakage protector is equipped with live wire and neutral line protection (bipolar protection). In case of failure, cut off the live wire and the neutral line together.

The wiring is also two wires in and two wires out.

In an era of electrification, some houses will install leakage protectors, so that there is no need to be so afraid of leakage, but there are many different types of leakage protectors, and the models are not the same, thenTwo-phase leakage protectorWhat is it? What are the models of two-phase leakage protectors? If you want to know, let's take a look.

1. What is a two-phase leakage protector?

1.Leakage protector, referred to as leakage switch, also known as leakage circuit breaker, is mainly used in the event of a leakage fault in the equipment and the protection of personal shock with fatal danger, with overload and short-circuit protection functions, which can be used to protect the overload and short circuit of the line or motor, and can also be used as an infrequent conversion and start of the line under normal circumstances.

2.Since the leakage protector is a signal trigger action, it will also produce a signal to trigger the leakage protector action under other electromagnetic interference, forming a mismoving brother. When the power switch is closed and powered, an impact signal will be generated, causing the leakage protector to malfunction.

The sum of the leakage currents of multiple branches can cause overstepping misoperation. Repeated grounding of the neutral wire may cause string mismovement.

Second, the two-phase leakage protector model.

1.Domestic ones are CHINT and Delixi, the original model is called DZ47LE-32 or 63, followed by C32, C40C50, the number behind C indicates the rated load current size (amperes), there are three functions: short circuit protection, overload protection, personal electric shock protection and ignition of surrounding combustibles due to fire wire leakage ignition, a kind of electrical fire protection.

2.The low-voltage leakage protectors include "DZL18-20 series leakage current switch (two poles), DZL31 leakage protector (two poles), K series leakage protector pole), DBK2 series leakage protection switch, DZL43, FIN series leakage protection switch, E4FL series leakage protector, F360 series leakage protection switch, DZL29 series leakage protection circuit breaker, and other series of models.

3.Generally, each household should be equipped with a low-voltage leakage protector (switch), and the leakage action current can be selected as milliamperes, with a rated current of 32A (within 140 square meters) and 60 amperes (more than 160 square meters), each unit should be installed, and the whole building should be installed, and the rated current of the switch can be selected by multiplying the total number of households by 20 amperes. Choose a low-voltage leakage protector (switch) with a leakage action current of 100-300 mAh.

There are many places where leakage protectors will be installed, so what is the two-phase leakage protector and what are its models, I think you have read the above introduction, and you also know about these.

Summary. Qinqin is happy to answer for you, the leakage protector can be used alone, but it is best to use it with other electrical protection equipment to complement and enhance the protection to ensure the stability and safety of the operation of electrical facilities. The leakage protector is mainly used to protect personal safety, and can disconnect the power supply in time when the electrical equipment leaks.

It is used alone as the first AN full protection system of the electrical system, which can effectively prevent personal injury and HUO disasters caused by electric shock accidents. <>

Can <> leakage protector be used alone?

Qinqin is happy to answer for you, the leakage protector can be used alone, but it is best to use it with other electrical protection equipment, play a complementary and enhanced protection role, and ensure the stability and safety of the operation of electrical facilities. The leakage protector is mainly used to protect personal safety, and can disconnect the power supply in time when the electrical equipment leaks. It is used alone as the first AN full protection system of the electrical system, which can effectively prevent personal injury and HUO disasters caused by electric shock accidents.

<> kiss to you which boring expansion is, leakage to slow down the use of lead protector precautions oh 1The working line n of the leakage protector protection line should pass through the zero sequence current. Otherwise, after it is turned on, there will be an unbalanced current that causes the leakage protector to malfunction.

2.The working neutral line N behind the leakage protection brightener and the protection wire (PE) cannot be combined into one. If the two are combined into one, when there is a leakage fault or an electric shock to the human body, the leakage current will flow back through the current transformer, and the result will be similar to the situation (3), causing the leakage protector to refuse to act.

The leakage protector is a device that automatically cuts off the power supply to protect life when the human body is electrocuted or the electrical appliance leaks slag electricity.

When leakage occurs, when the leakage current is greater than (generally 30mA is the human safety current), the switch will jump off and cut off the power, so as to prevent people from being electrocuted due to short circuit of the circuit and prevent electric shock. The application of leakage protector in low-voltage power supply system can greatly improve the safety of power supply system operation, and play an extremely important role in further ensuring the safety of human beings and electrical equipment.

The principle is to pass the neutral line and the item line through the transformer inside the leakage protector at the same time, and the transformer can only detect the current of a single AC wire, and the transformer can not feel the current when the current of the neutral line and the phase line is the same.

When the leakage of the zero line and the phase line current is not the same, the transformer feels that the current sends out a signal, and the amplifier amplifies the signal to the electromagnet inside the leakage protector to move the pluggy Huai quietly as a signal, and the trip device falls after the electromagnet acts, and the switch is opened to play a protective role.