Skip to main content

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!

Comments

Post a Comment

Popular posts from this blog

NBFM & WBFM (Narrow band frequency modulation & Wide band frequency modulation) simple explanation. By Yuvi - Study Point

Hey everyone, today we are going to learn about NBFM & WBFM (Narrowband frequency modulation & Wideband frequency modulation) in simple or easy way. So, without wasting any time lets get started. The information about NBFM & WBFM When the spectrum's efficiency is important or it is required then we use NBFM (Narrowband frequency modulation) is used.  But when better signal quality is required or when it is important then we use WBFM (Wideband frequency modulation). The term NBFM is used for those applications where the modulation index is less than or equal to 1. And the term WBFM is used for those applications where the modulation index is greater than or equal to 1. Now, let's see more difference between Narrow band frequency modulation(NBFM) and Wideband frequency modulation(WBFM). The term narrow-band and wide-band refer to the actual radio channel bandwidth. The purpose or advantage of using NBFM (Narrowband frequency modulation) The purpo...
2 comments
Read more

Merz Price Differential Protection of Alternator. By Yuvi - Study Point

Hey everyone, today we are going to learn about Merz price differential protection of alternator. So, without wasting any time lets get started. Currents at the two ends of the protected section are compared in this scheme of differential protection of alternators. under the normal operating conditions, these currents are equal. But when a fault occurs in the protected section these currents become unequal. The most common system which is used for the protection of the stator winding faults employs circulating-current principle. Phase to phase fault and phase to earth fault, these are the two types of faults which occur in an alternator stator.  And through the operating coil of the relay, the difference of the currents under fault conditions is arranged to pass. And after this, the relay closes its contact to isolate its protected section. Or we can say to isolate its healthy section from the faulty section. And this form of protection is also known as Merz- pric...
Post a Comment
Read more

Corona effect in transmission lines.| Explanation by Yuvi - Study Point

You all have heard about the Corona effect in transmission lines, now understand it in a simple way. This effect is a phenomenon which is associated with all transmission lines. At certain conditions, the electric field closer or near the energized conductors or components produces a tiny electric discharge or we can say corona which causes the surrounding air to ionize. And due to this ionization of surrounding air molecules of conductors, a luminous glow with hissing noise is produced which is known as Corona effect. Between the transmission lines, air act as a dielectric medium or we can say that air act as an insulator between current-carrying conductors. Between the conductors, voltage induces and if this voltage is of alternating nature then charging current will flow between the conductors. And the voltage of this transmission line and electric field intensity increases because of this charging conductor. There is a predetermined value of the electric field inten...
Post a Comment
Read more