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  • What Is The Purpose of Electronic Overload Relays?

What Is The Purpose of Electronic Overload Relays?

Posted on February 19, 2022February 16, 2022
Category:
  • blog
  • Home Category

There are various types of electric motors that are used in the devices and these motors work by getting power from electricity. The electricity is never stable and keeps on fluctuating for various reasons. These motors are very expensive and damage to them can be difficult to sort, so people like protective devices like electronic overload relays.

What is an electronic overload relay?

This device is designed to provide safety to one and triple-phase motors. These devices are controlled by microprocessors in machines. These work to reduce the excessive temperature in the motors due to electrical surges. 

These relays are the best way to replace the thermal overload relays. Electronic overloads relay provide reliable and rapid protection to the motors if overload or section failure happens.

The electronic overload relays are 3 pole electromechanical devices. The internal current transformers of the motor constantly monitor the current in a different section.

This process activates the relay and change in the contacts switching positions will also take place at the same time. The electronic relays work on the basis of self-supplies which enables them the external need for power supply. 

What is the purpose of using an overload protection relay?

This will increase the overheating of the motor and harm the windings. Because of this, it’s essential to provide safety equipment to the motor and motor department circuit components from overload situations. 

Overload relays protect the motor from heat and overload conditions. Overload relays are a part of the motor starter (meeting of contactor plus overload relay). They protect the motor by tracking the current flow in the circuit. 

If the current rises above a positive restriction over a positive duration of time, then the overload relay will trip, running an auxiliary touch which interrupts the motor manipulate circuit, de-energizing the contactor. This results in the elimination of the electricity to the motor.

Electronic overload relays provide dependable and particular safety for motors in the occasion of overload or section failure. The electronic overload relay could make up a compact beginning answer collectively with contactors.

How does it protect from high current?

The overload relays are part of the overall protection plan for electronics, positioned to protect the motor, and motor control equipment in opposition to sustained overloads through interrupting the electricity to the contactor coil, which disconnects the motor from the electricity line. 

A motor’s vulnerability lies in its insulation considering the fact that motor heating will increase with the rectangular current and reasons for deterioration of insulation.

 Drawing immoderate mechanical masses or running with low line voltage will increase the current drawn through the motor and will increase the temperature. Overheating could end as the overload relay plays its layout function: interrupting the manipulated voltage which in impact disconnects the motor from the line.

The advantages:

  • It can also be applied for detecting each overload situation in addition to fault situations & then claim ride instructions for a defensive tool.
  • It has evolved into microprocessor structures in addition to solid-country electronics.
  • These relays deactivate the tool on every occasion it pulls intense current.

Main features

  • The variation in selectable tripping (10E, 20E, 30E)
  • The vast range of adjustable current 
  • These provide the overload safety with section loss sensitivity
  • It has both manual and automatic reset, sealable guide

Conclusion

Electric motors see huge utilization in machines with rotating components. Motors are pretty expensive, so it’s far essential to save them from failure because of wearing extra electric powered current than their rated amperage.

Electrical overload relay provides safety against the short-circuits in the motor windings or peripheral cables. However, normally happens because of jamming or fallacious operation.

 

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