A, leakage protector principle
Leakage protector is mainly composed of three parts: detection elements, intermediate amplification link, operation of the actuator. Its working principle is: the leakage protector is installed in the line, the primary coil is connected to the line of the power grid, the secondary coil is connected to the leakage protector in the off-trigger.
When the normal operation of the power equipment, the line current is balanced, the sum of the current vectors in the transformer is zero (the current is a vector with a direction, such as by the direction of outflow for "+", return direction for "-", in the transformer to and from the current size is equal, the direction is opposite. Current is equal in size, opposite direction, positive and negative cancel each other out). Since there is no residual current in the primary coil, it will not sense the secondary coil, and the switching device of the leakage protector operates in a closed state.
When the equipment shell leakage and someone touched, it is generated at the point of failure shunt, the leakage current through the human body - earth - work grounding, return to the transformer neutral point (and without the current transformer), resulting in the transformer Shen inflow and outflow of current imbalance (the current vector sum is not zero), the primary coil Shen Residual current is generated in the primary coil. As a result, it will sense the secondary coil, when this current value reaches the leakage protector limited action current value, the automatic switch off, cut off the power supply.
Two, the leakage protector role
1, to prevent equipment shell failure.
2, to prevent the insulation of private wires broken.
3, to prevent the human body directly touching the phase line voltage.
4, to prevent electric shock caused by leakage of electrical equipment and electrical lines;
5, to prevent the occurrence of unilateral electrocution in the process of electricity;
6, cut off single-phase grounding faults in the operation of electrical equipment in a timely manner, to prevent fire accidents due to leakage of electricity;
7, in some very humid places, such as swimming pools, shower rooms
7, in some very humid places, such as swimming pools, showers, kitchens, bathrooms, etc., in such places the human skin resistance will be reduced, so the chances of electrocution deaths will increase greatly, after the installation of the protection period can effectively reduce the electrocution deaths of the tragedy of the accident occurred.
8, when some electronic equipment insulator damage, its exposed metal accessories may be with dangerous voltage, this dangerous voltage can not be eliminated by grounding methods, the only way to rely on the installation of leakage protector to ensure that people in the moment of electric shock to quickly cut off the circuit, to protect the safety of human life.
What is the role of the leakage protector? Leakage protector principle is introduced to this, I hope to help you decorate, leakage protector plays a very important role in our lives, I believe we should have a knowledge, want to learn more about home furnishing knowledge please pay attention to home furnishing network (www.jiazhuang.com)