As a widely used electronic device, electronic overcurrent relays can be used in hoisting grinding or mixing, etc., and the electronic overcurrent relays on the market can also provide safety protection functions, such as exceeding the rated voltage. In addition to automatic shutdown, we found that the biggest advantage of the so-called electronic overcurrent relay is the electronic overcurrent protection, which allows you to use this tool to reduce the cumbersome manual operation. Then, let's take a look at the working principle and parameter setting of the electronic overcurrent relay together with Xiaobian, which can help us shop around to determine a reasonable purchase plan.
First, the difference between thermal overload relay and overcurrent relay
The former is used for thermal overload protection, and the current reaches a certain value is not too expensive to do, it takes a certain amount of time to function. The latter is used for short-circuit protection or overcurrent protection. Once the current reaches the set value, it acts immediately.
Second, the working principle of overcurrent relay
The working principle of the electromagnetic overcurrent relay is compound, consisting of two components: an inductive and an electromagnetic one that share a coil. When the coil of the relay is connected with an alternating current, two magnetic fluxes having a certain phase difference are generated in the shielded and unshielded portions of the core. This flux interacts with the eddy currents induced in the disk to create a torque on the disk. At an operating current setting of 20% to 40%, the disk begins to rotate. At this time, since the fan teeth and the worm are not engaged, the relay does not operate.
When the current in the coil increases to the setting current, the electromagnetic torque is greater than the reaction torque frame of the spring, so that the fan teeth mesh with the worm and the fan teeth rise. At this time, the moving iron of the relay is pushed by the fan ejector pin, so that the air gap on the right side of the magnet is reduced, and the left air gap is increased, so that the moving iron is attracted by the magnet to make the relay contact act.
When the current in the relay coil is set, the operating time limit of the sensing element is inversely proportional to the square of the current. As the current increases, the magnetizer is saturated and the operating time limit tends to be constant. When the current in the coil is large enough to a certain current multiple, the electromagnetic element acts instantaneously, and thus the action time limit of the relay has a characteristic of limited inverse delay.
The relay has a number of taps for adjusting the operating current of the sensing element and the electromagnetic element. In addition, the air gap between the moving iron and the electromagnet is changed by a double current screw to adjust the operating current of the electromagnetic element. The relay has a mechanism for adjusting the operating time setting value of the sensing element and a signal plate for the main contact to operate. By rotating the return mechanism by hand, the sign can be returned without removing the casing.
Overcurrent relay It is a kind of relay, which is basically the same as the function of the thermal relay. It is generally applied to the relay protection circuit of the motor, transformer and transmission point system. Overcurrent relays are generally classified into inductive electromagnetic and integrated circuits, and have characteristics of time delay and inverse time.
The working principle of the electromagnetic overcurrent relay is compound, consisting of two components: an inductive and an electromagnetic one that share a coil. When the coil of the relay is connected with an alternating current, two magnetic fluxes having a certain phase difference are generated in the shielded and unshielded portions of the core. This flux interacts with the eddy currents induced in the disk to create a torque on the disk.
Since the overcurrent relay is applied to important mechanical equipment such as motors and transformers, when the main equipment is overloaded and short-circuited, the six-stage egg can be reliably operated or signaled in a timely manner according to a predetermined time limit. Safety of main equipment and transmission and distribution systems.
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