Dear Friends,
I have a 500KVA transformer supplying whole factory having
3 phase and single phase mixed loads. Power room has
ammeters connected via CTs for individual phase. Now I know
that readings shown on meter for each phase say R,Y and B
are line currents. But when I want to know the total on
transformer do I need to add the currents of all three
phases readings shown on meter or value for anyone phase
will give me the correct power load on transformer for that
point of time.
2. If ammeter shows unbalanced readings for R,Y, B phases
say 150, 250 and 300 respectively so can I assume that 150A
i.e average of 3 will be the 3phase load currents and
remaining will be 1phase currents. Please clarify my doubt.
Answers were Sorted based on User's Feedback
Answer / ahmadmukhtiar
1. The load of R, Y or B will be the total load on
transformer.
2. There must be phase balancing system for protection
otherwise the equipment connected as load will get damaged
if all three phases are unequal.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / k.prakashchandra
Calculate load(KVA) on each phase and add
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sakthivel
each phase you find consuming power with use ammeter reading
and volt meter reading
each phase you regulate the load current or equal load
current load you choose
Is This Answer Correct ? | 2 Yes | 2 No |
Answer / abdul karim
If you wants to know the total load of transformer , you must use a watt metrer , OR you will calculate the load in watts of every individual phase then sum of all three phases will be your answer.
Is This Answer Correct ? | 0 Yes | 1 No |
I want to know what is the short circuit level when 8 NOS 2000 kVA, 415v, 50hZ generator connected in paraller
dear all, i want to ask that what is diversity factor. please explain breifly. because i hve quiet no concept about this.
What types of I/O have you designed? What were their size? Speed? Configuration? Voltage requirements? Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?
Why neutral is not used in three phases dol starter
whats the existence of reactive power and when it arises?
why current is denoted by I
sir iam from electrical and electronics branch ,can i appear for the hpcl offline requirtment? if yes please mail me on vikram_raju25@yahoo.co.in
what are corona losses
what happen if the battery is charged by more than one source ,for ex: connecting data cable to laptop & charger pin to source supply ?
Why are cables rated for 40 KA for 0.25 Sec fault current rating?
Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?
Excat meaning of burden in only one word?
3 Answers Bhel, DG Electricals,