Function Of Current Relay

Current relays mainly reflect current changes and can play a role in current protection and control in the electrical circuit of electrical equipment. The current relay is connected to the main circuit. When the current in the circuit reaches a current value outside the specified range of the current relay, it will open the main circuit and generate related signals. Current relays are usually used in circuits for automatic control of electrical appliances. They are used for automatic switches that control larger currents through smaller currents, and the switching circuits are used for safety protection.

When the current relay is in use, you need to remove the outer shell, pull out the machine and check whether there is any damage during transportation, for example, the magnetic plate of the current relay collides with the rotor. At this time, we need to move the pointer of the current relay to the first full point, turn the movable system towards the magnetic plate by hand and then release it. The movable system should be turned back to the original position until the stop position. The adjustment check is fine.

Current relays usually require a certain degree of current intensity, and the current relay starts to work just after reaching a certain current intensity.

Commonly used current relays include overcurrent relays and undercurrent relays. The overcurrent relay is when the electrical circuit is in a short circuit or when the protected circuit exceeds the current rating of the specified range, the overcurrent relay starts to work to control the loss of current in the circuit, so as to control the contactor to break the switching circuit. The circuit plays an overcurrent protection effect. The working principle of the undercurrent relay is that when the current is lower than the current rating of the specified range, the undercurrent relay starts to work to break the electrical circuit.

There is a gap between the moving piece and the magnetic pole in the current relay. We must ensure that the moving piece and the magnetic pole of the current relay cannot collide with each other and the current relay is in use regardless of the working state of the current relay. The bearings of the current relay should not be lubricated. When cleaning the contacts of the current relay, it is suitable to use a sharp blade or a fine grindstone, and then wipe with a clean soft cloth to avoid touching the contacts of the current relay with fingers , Remember not to use sandpaper or other rough things to clean the contacts of the current relay.