Relay manufacturer tells you how to wire the earth leakage relay
A leakage relay is a device that detects circuit contact (leakage) and sends a mechanical opening and closing signal to the control circuit. Usually, we install leakage relays at home, it has become an important component of the total line protection device and plays an important role in preventing line and equipment leakage and personal electric shock. The following is the wiring method, working principle, and function of the earth leakage relay organized by relay manufacturer, hoping to bring you a reference and help.
1. Working principle of earth leakage relay
The relay manufacturer tells you that the leakage relay consists of a detection device, a test device, a tripping mechanism, a contact part, and a fixed part. The detection device is used to detect whether there is leakage, and the function of the tripping device is to drive the contacts to trip.
The principle of the detection device is: to set a magnetic ring made of magnetic material on the incoming line of the electrical equipment, and all the power lines pass through the ring. Under normal circumstances, the load side does not form a loop with the ground, so the total current passing through the magnetic ring is zero.
This means that no current flows through the entire magnetic ring, so no magnetic flux is generated in the magnetic ring. If there is currently flowing through the load side to the ground, there will be current flowing in the magnetic ring, and a magnetic flux that is a function of the leakage current will be induced in the magnetic ring. At this time, if the magnetic ring E has been wound on the coil, an induced potential is generated in the coil. The magnitude of this potential reflects the magnitude of the leakage current.
In the leakage relay, the coil on the magnetic ring is connected to the coil of the leakage release. When the magnetic ring coil generates an induced current, it drives the armature in the trip to reset.
2. the leakage relay wiring method
When wiring the leakage relay, the relay manufacturer suggests that you should first understand the power supply and load signs on the relay, that is, you should be familiar with the power supply range of the relay. After it is connected, it will directly lead to a short circuit of the entire circuit, which may cause the wire to burn out, and may even lead to a fire in serious cases.
The wiring methods of leakage relays generally include a three-phase five-wire system and a single-phase three-wire system. When wiring the leakage relay, it must be remembered that the protection wire of the relay cannot pass through the current transformer. For the choice of wiring method, both have their advantages, so there are not too many requirements. However, the user needs to pay attention to the requirements for the protection line, that is, when wiring the relay, the protection line needs to be connected to the protection trunk line at the incoming end of the circuit, and the protection line cannot pass through the current transformer during the process of connecting the protection trunk line.
It should be noted that the electrical equipment using the leakage relay can only be connected to the load side of the relay. Some people not only connect one end of the electrical equipment to the power supply but also connect the other end to the load side. The effect of contacting both ends is that the leakage relay does not work.
3. The main function of the leakage relay
The leakage relay is used to detect whether there is leakage in the line and equipment. Once there is leakage, it will automatically trip and cut off the power, which prevents the leakage of wires and equipment, or the electric shock accident caused by the electricity use process, and avoids the fire accident caused by the leakage. The leakage circuit breaker is one of the line protection devices. There is an experimental button on the product. Everyone should test it regularly to avoid the failure of the leakage relay.
This article is led by the relay manufacturer to have a preliminary understanding of the leakage relay. I hope it will be helpful to everyone. At the same time, it is necessary to constantly summarize, to improve professional skills. You are also welcome to discuss some knowledge points of the article.