Dissipative heat of transformers
- Thread starter m sleem
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Worst case loss, if that's what you want, is loaded at rated load.
Means that at (load loss).
Not sure I understand your point.
The most heat dissipated by the transformer is when it is delivering its rated kVA.
From vendor catalog you can find two different values of VA (load loss & no-load loss). for HVAC engineers which value they should consider as a heat dissipation.
I've never seen it put that way.
But maybe a reasonable assumption is that no load loss is primarily Fe loss and on load loss is primarily the Cu loss.
On that basis I would sum them.
weressl
Esteemed Member
Full load loss already includes the no-load loss. If you do not expect your transformer fully loaded, you can extrapolate between those two numbers. It is unlikely though that the attached oil filled transformer would be installed indoors, needing HVAC.:lol:
I have the same for dry-type. Please check View attachment ABB Catalog-Page 30.pdf
View attachment ABB Catalog-Page 38.pdf
If load loss includes no-load loss hence we should consider load loss only.
weressl
Esteemed Member
Looking at the ABB data the second time, you should confirm it with ABB if the "load loss" includes the no load losses. I am more used to see "full load loss" or "nameplate rating load loss". At motors, the FLA includes the No Load Amperes.
mivey
Senior Member
Load or winding loss is defined to be the losses that occur under load but do not exist at no-load. They are almost entirely resistance related and are also called copper loss.
The no-load losses are the iron losses, dielectric losses, and the copper loss due to exciting current. Also called iron loss.
The total losses are the sum of the load and no-load losses.
The no-load losses are the iron losses, dielectric losses, and the copper loss due to exciting current. Also called iron loss.
The total losses are the sum of the load and no-load losses.
mivey
Senior Member
Both.
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