The leakage protection device is a grounding protection device used to prevent the accident caused by the personal electric shock and leakage. When the circuit or the electricity equipment is greater than the setting value of the device, or when the electric shock hazard occurs, it can quickly move and cut off the accident.Power supply to avoid the expansion of the accident and ensure the safety of personal and equipment.
Classification of leakage protection device
If the classification of the leakage protection device is divided according to a large number, there are four levels, and the number of the contacts of the contact is the corresponding number of the number of the lines.In this way, you can know how many levels of contact.The classification of the leakage protection device is also possible to divide according to the relevant phases. There is a difference between single -phase and three phases.Generally, the protection device for single -phase devices or corresponding circuits is single -phase leakage protection device. Three -phase circuit and related equipment are protected by three -phase leakage protection device.In addition, there is a corresponding division based on leakage and time.
Leakage protection device is mainly used in
It is mainly used to prevent accidents caused by electric shock accidents, electrical circuit failures, or accidents caused by electricity circuit failures.Some leakage protection devices also have other protection functions such as overload protection, overvoltage and voltage protection, and lack of phase protection.Therefore, when a power leakage or failure occurs, as long as there is a leakage protection device, the circuit can be automatically disconnected to protect.In addition to in the family, some high -power electrical devices, or when using electrical use of electricals, should have a leakage protection device.
Direct power protection device design
Design requirements: 1. Do not be too close to the large current bus and AC contactor during design and installation.2. Design must strictly distinguish between neutral lines and protecting ground lines.The neutral lines of the tritinal quad -line and quad -type leakage circuit breakers should be connected to the circuit breaker. The neutral lines of the circuit breaker can no longer be used as a protective ground wire, nor can it be repeatedly grounded or connected to the electrical equipment shell.The protective ground wire must not be connected to the leakage of the people.
Principles of leakage protection device
Working principle of a leakage protector: Install the leakage protector in the line, connect the one coil with the line of the grid, and connect to the deserter in the leakage protector.When the electric equipment is running normally, the current in the line is balanced, and the sum of the current vector in the intestinal sensor is zero (the current is a vector with direction, such as "+" in the flowing direction, "-", in the return direction as "-", in the return direction as "-", in the return direction, in the return direction, in the direction of "-", in the return direction, in the backward direction, in the backward direction, in the backward direction, in the direction of "-", in the return direction, in the backward direction, in the direction of "-".The circuit current in the transformer is equal, the direction is opposite, and the positive and negative offsets).Since there is no remaining current in the first coil, the secondary coil will not be sensing, and the switch device of the leakage protector runs in a closed state.When the device shell is leakage and some people touch it, they will be shocked at the fault point.The current is unbalanced (the sum of the current vector is not zero), and the remaining current generates the remaining current.Therefore, the secondary coil will be induced. When the current value reaches the movement current value of the leakage protector, the automatic switch is off and cuts off the power.

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