Hi. I'm making a 3 phase furnace with heating coils. Total power rating is 5 KW. I have to make one heating element for each phase. How do I split the KW rating? Will it be a straight 5/3? Also when calculating the resistance for each heater, should I calculate based on 220V(single phase voltage in India) or 440V (3 phase voltage)?
Discuss 3 Phase heating coil in the Talk Electrician area at ElectriciansForums.net
B
Bobster
Are the elements connected in star or delta configuration?
So each heating coil will be subjected to 440V across 2 phases, yes?
Delta Connection (Δ): 3 Phase Power, Voltage & Current Values
What is Delta Connection (Δ)?Delta or Mesh Connection (Δ) System is also known as Three Phase Three Wire System (3-Phase 3 Wire) Voltage, Current & Power Values in 3-Phase Delta Connection. Line Voltages , Phase Voltages, Line Currents & Phase Currents & Power in Delta (Δ) Connection.
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you must firstestablish whatvoltage teach coil requires.if it's 230V per coil, then 415V is :
![[ElectriciansForums.net] 3 Phase heating coil](https://electricians.s3.eu-west-1.amazonaws.com/data/attachments/41/41350-b68cdd149f20a805a500a24f756ff91a.jpg "[ElectriciansForums.net] 3 Phase heating coil")
In delta each coil would be 5000/3 = 1666watts.So res of coil would be v squared/watts = 440sq/1666=116ohms per coil.If you say the single phase v is 220,3 phase should be 380v not 440v,unless its a wierd system.
Regards,S
weird
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