Phase loss indication

Replies

• 

  Munguti

  You question isn't clear.
  When you say display through LED do you means that you are using an LED powerd display more like the lcd display in digital hand watches?
  Please be clear.
• 

  Er_Mahendran

  Sorry. My question is how to connect LED in three phase supply (415Vac) to indicate that the particular phase is failed. (i.e not lighting the LED for failed phase)
• 

  reachrkata

  Simple !!
  
  Step-down, rectify and filter each of the phases separately into 3 DC voltages which power 3 different LEDs. When any of the phases fail, the corresponding LED switches off.
  
  -Karthik
  
• 

  Er_Mahendran

  Hello,
  Sorry. My requirement is without step down and rectification, I want to connect LEDs in 3 phase 3 wire to know the phase failure. How to do that?
• 

  kashish0711

  Here is an image illustrating #-Link-Snipped-#'s idea. Remember you van use either a proper 3 phase transformer or you can use a CT, both are same, the 3 phase t/r just gives you more control. 😀
  
  
  
  
  
  
• 

  cooltwins

  very good illustration!!!
  
  I DIDN'T GET THE IDEA FIRST BUT THE DIAGRAM WAS ENOUGH TO HELP ME
  
  KEEP UP THE GOOD WORK MATE!!!!
• 

  reachrkata

  There is no way LEDs will directly work with normal AC. You do need to step it down either by a transformer or by using a resistor potential divider to bring down the voltage to manageable levels.
  
  -Karthik