HV transformer: load (copper) loss at STC

What it is

The load loss of a high-voltage step-up transformer at the system's reference power, as a fraction, applied to the system total.

Typical values and how to get it

0 when the system has none; 0.3 to 0.6 % of the reference power when it has one. If not given: 0: no high-voltage transformer copper loss.

How it is applied

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

where

Symbol	Meaning	Unit
$P_{\text{loss}}(t)$	the loss of the timestep	W
$f_{HV,Cu}$	this input as a fraction	—
$P_{ref,sys}$	the system's AC reference power, the sum over the inverters	W
$\text{PF}$	the power factor	—
$P_{sys}(t)$	the system's inverter output, or with the cascade reference the power after the MV line	W

References

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

API

ac_losses.hv_transformer_loss_at_stc — sent as a fraction 0–1

Symbols follow the symbol registry.