MV transformer: load (copper) loss at STC

What it is

The load loss of the medium-voltage transformer at the reference power, as a fraction.

Typical values and how to get it

The transformer's load loss at its rating in kilowatts, times the square of the reference power over the rating, divided by the reference power; about 1 %. If not given: 0: no transformer copper loss.

How it is applied

$$P_{\text{loss}}(t) = \frac{f_{Cu}\,P_{ref}}{\text{PF}^2}\left(\frac{P(t)}{P_{ref}}\right)^2$$

where

Symbol	Meaning	Unit
$P_{\text{loss}}(t)$	the loss of the timestep	W
$f_{Cu}$	this input as a fraction	—
$P_{ref}$	the AC reference power of one inverter (Model tab: AC power reference)	W
$\text{PF}$	the power factor	—
$P(t)$	the inverter output of the timestep, or with the cascade reference the output less the AC wiring loss	W

References

1. IEC 60076-1:2011, Power transformers, Part 1: general (no-load and load losses)

API

ac_losses.transformer_loss_at_stc — sent as a fraction 0–1

Symbols follow the symbol registry.