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Static relay working and simple explanation. By Yuvi - Study Point

Hey everyone, so today we are going to learn about the static relay. It's working, explanation, etc. 
So, without wasting any time lets get started. 

What are static relays?
  • Static relays are electrically operated switch that has no moving parts or we can say that the term static implies or states that the relay has no moving parts or the relay which does not have any moving part is known as the static relay.  
  • In this relay, only D.C supply is given to the relay measuring unit, amplifier, output device and to the trip circuit.
  • Which means the output is obtained by the static components like an electronic circuit, magnetic circuit, etc.
  • The static unit is used to obtain the response and the electromagnetic relay is used for switching operation.
  • So this static relay consists of the static and electromagnetic relays.
More brief information about static relays.
  • The static relay only gives a response to the electrical signal.
  • The design of static relays are based on analog electronics devices and it does not base on coils to create the relay characteristics.
  • Static units obtain the response and the purpose of using an electromagnetic relay is only for switching operations.
  • The static relay is consists of a current transformer or potential transformer or transducers, rectifier, amplifier, trip circuit, an output device, relay measuring circuit, etc.
 The Operation and working of static relays.
  • The input of the current transformer is connected to the transmission line and its output is given to the rectifier.
  • The rectifier is an electrical device which converts the alternating current means A.C which can periodically reverse its direction to direct current (D.C) which flows in only one direction. Simply, it converts the A.C into D.C.
  • Rectifier rectifies the input signal and passes it to the relaying measuring unit.
  • Relay measuring unit has comparators, level detectors, and logic circuit. So, the output signal from the relaying unit is obtained when the signal reaches its threshold value.
  • And the output of the relaying measuring unit acts as an input for the amplifier.
  • An amplifier amplifies the signal and gives the output to the output device.
  • Now the output device activates the trip coil only when the relay operates.
  • The output is obtained from the output devices only when the measured has well-defined value.
  • And when the output device gets activated then it gives the tripping command to the trip circuit.
  • We know that the static relay only gives the response to the electrical signal and if there is a physical quantity like light, heat, etc. So, firstly these physical quantities need to convert into an analog and digital electrical signal and then it acts as the input for the relay. 
{ And if you guys want further brief and simple explanation then please go and check this video and my channel. }

https://youtu.be/RnYzgEyHxVE

{ In this lecture video I have given an explanation of Static relay with its advantages, disadvantages or limitations, etc. }

Thank you!

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