Three Winding Transformer

List of input parameters

Parameter	Description	Type	Value range	OpenDSS equivalent
name	a custom name	string	-	name
sn_hv_mva*	rated apparent power on high voltage side	float	> 0	pu
sn_mv_mva*	rated apparent power on medium voltage side	float	> 0
sn_lv_mva*	rated apparent power on low voltage side	float	> 0
vn_hv_kv*	rated voltage on high voltage side in kV	float	> 0	-
vn_mv_kv	rated voltage on medium voltage side	floa	> 0
vn_lv_kv*	rated voltage on low voltage side in kV	float	> 0	mvasc3
vk_hv_percent*	short circuit voltage from high to medium voltage	float	≥ 0	-
vk_mv_percent*	short circuit voltage from medium to low voltage	float	≥ 0
vk_lv_percent*	short circuit voltage from high to low voltage	float	≥ 0
vkr_hv_percent*	real part of short circuit voltage from high to medium voltage	float	≥ 0	-
vkr_mv_percent	real part of short circuit voltage from medium to low voltage	float	≥ 0
vkr_lv_percent	real part of short circuit voltage from high to low voltage	float	≥ 0
pfe_kw*	iron losses in kW	float	≥ 0	-
i0_percent*	open loop losses in percent of rated current in %"	float	≥ 0	-
shift_mv_degree*	angle shift to medium voltage side	float		-
shift_lv_degree	angle shift to low voltage side	float
vector_group***	Vector group of the transformer; HV side is Uppercase letters and LV side is lower case	string	‘Dyn’,’Yyn’,’Yzn’,’YNyn’
tap_pos	current tap position of the transformer	integer
tap_max	maximal allowed tap position	integer
tap_min	minimal allowed tap position	integer
tap_step_percent	tap step size for voltage magnitude in %	float	≥ 0
tap_step_degree	tap step size for voltage angle in degree	float	≥ 0

*necessary for executing a balanced power flow calculation

***necessary for executing a three phase power flow / single phase short circuit

The exact model and result parameters (for pandapower) are defined in the link below:

https://pandapower.readthedocs.io/en/latest/elements/trafo3w.html