Hey everyone, today we are going to learn about Overcurrent relays in a simple or easy way.
So, without wasting any time lets get started.
So, without wasting any time lets get started.
- Against excessive currents over current protections protects electrical power. These excessive currents are caused by short circuits, ground faults, etc.
- The over-current relay consists only one current operated element means there is no voltage coil etc is required to construct this protective relay.
- As I have already said that, in an overcurrent relay the actuating quantity is only current.
- There would be essentially a current coil in an overcurrent relay.
- When a normal current flows through this current coil, then the magnetic effect generates by the coil which is not sufficient to move the moving element of the relay.
- And in this condition, the restraining force is greater than the deflecting force.
- But when the current through the coil increases, then the magnetic effect also increases and after a certain level or value of current, the deflecting torque which is produced by the magnetic effect of the coil crosses the restraining force.
- Then the moving element of the relay starts moving and changes the contact position in the relay.
There are different types of Overcurrent relays ~
- Instantaneous Overcurrent Relay
- Definite Time Overcurrent Relay
- Inverse Time Overcurrent Relay
- (IDMT) Inverse Definite Minimum Time Overcurrent Relay
- Very Inverse Time Overcurrent Relay
- Extremely Inverse Time Overcurrent Relay
https://youtu.be/LyX6805PmMg
{ In this lecture video I have given a simple explanation about the overcurrent relay, its working principle, its types, etc.
So, please go and check out my channel and this video. }
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