What is the principle of leakage protection switch leakage protection switch wiring
Leakage protection switches can help protect our circuits and sometimes even protect our personal safety. It seems to be inconspicuous in our daily life, but the role played by it cannot be ignored. Nowadays, every household's power system is equipped with a leakage protection switch. What do you know about the leakage protection switch and what is the principle of the leakage protection switch ? How is the leakage protection switch wiring? Today Xiao Bian has collected some information, let us take a look at it.
First, what is the leakage protection switch
At present, according to the working principle of the leakage protection switch sold in the market, it is divided into three categories: voltage type, current type and pulse type. The voltage type leakage protection switch is connected between the neutral point of the transformer and the earth. When the contact is neutral, the neutral point shifts to generate voltage on the ground, thus protecting the operation and cutting off the power supply. However, because it protects the entire distribution transformer network, Therefore, it cannot be graded.
Due to the large extent of power outages and the relatively frequent actions, it has been eliminated. The pulse current protector in the event of electric shock, the phase and amplitude of the three-phase unbalanced leakage current suddenly changed, this as the action signal, is currently widely used in the current leakage protection device.
Second, the type of leakage protection switch
1, only with the leakage protection function, must be used with fuses, thermal relays, over-current relays and other protection components.
On the basis of 1, at the same time with overload protection.
On the basis of 1, at the same time with overload and short circuit protection.
On the basis of 1, at the same time with short circuit, overload, leakage, overvoltage, undervoltage function.
Third, the leakage protection switch action principle
There are two groups on a core: one input current winding and one output current winding. When there is no leakage, the input current and output current are equal, and the vector sum of the two magnetic fluxes on the core is zero, and it will not be A potential is induced on the third winding, otherwise a voltage is induced on the third winding, which is amplified to push the actuator and cause the switch to trip.
The leakage protection switch is added in front of the above UPS. Although the UPS has no leakage phenomenon, due to the magnetic fluxes formed by the various harmonics in the iron core and the hysteresis effect of the iron core, it cannot be zero, so similar leakage occurs. In an illusion, the leakage protector trips frequently.
Fourth, leakage protection switch wiring
The TN system can be divided into three wiring modes:
TN25 system: The neutral line of the entire system is connected separately from the protection line.
TN 2C system: The neutral and protection lines of the entire system are combined.
TN 2C2S system: The first part of the trunk line of the whole system is shared with the neutral line and the latter part is separate.
Another correct type of earth leakage protection switch wiring system is TT system, which means that the neutral point on the low-voltage side of the distribution network is directly grounded, and the exposed conductive part of the electrical equipment is directly grounded through the protection line.
Leakage protection switch wiring method Whether it is TN or TT, in the installation process must be strictly distinguished between the neutral line N and the protective line PE, three-quadratic or four-phase leakage protector neutral line, regardless of its compliance If the neutral line is not used, the neutral line of the power supply should be connected to the input port of the protector. The neutral line that passes the leakage protection switch must not be used as a protection line, and must not be repeatedly grounded or connected to exposed conductive parts of the equipment. The protection line cannot be connected to the leakage protection switch.
From the wiring diagram of the leakage protection switch, we can see the wiring points of several leakage protection switches:
The neutral wire on the load side of the leakage protection switch must not be shared with other circuits.
When the leakage protection switch is marked with the load side and the power supply side, the wiring should be installed in accordance with regulations, and it cannot be reversed.
The installation of a leakage protection switch with short-circuit protection must ensure that he has sufficient arcing distance in the direction of arc discharge. The arcing distance is installed in accordance with the regulations of the leakage protection switch manufacturer.
Summary: The relevant information on the leakage protection switch is introduced here for everyone. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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