Struct power_flow_data::ImpedanceCorrection

source ·

pub struct ImpedanceCorrection {Show 23 fields
    pub i: i16,
    pub t1: f64,
    pub f1: f64,
    pub t2: f64,
    pub f2: f64,
    pub t3: f64,
    pub f3: f64,
    pub t4: f64,
    pub f4: f64,
    pub t5: f64,
    pub f5: f64,
    pub t6: f64,
    pub f6: f64,
    pub t7: f64,
    pub f7: f64,
    pub t8: f64,
    pub f8: f64,
    pub t9: f64,
    pub f9: f64,
    pub t10: f64,
    pub f10: f64,
    pub t11: f64,
    pub f11: f64,
}

Expand description

Transformer impedance corrections are used to model a change of transformer impedance as off-nominal turns ratio or phase shift angle is adjusted.

The T_i values on a transformer impedance correction record must all be either tap ratios or phase shift angles. They must be entered in strictly ascending order; i.e. for each i, T_{i+1} > T_i. Each F_i entered must be greater than zero.

On each record, at least 2 pairs of values must be specified and up to 11 may be entered.

The T_i values that are a function of tap ratio (rather than phase shift angle) are in units of the controlling winding’s off-nominal turns ratio in pu of the controlling winding’s bus base voltage.

Although a transformer winding is assigned to an impedance correction record, each record may be shared among many transformer windings. If the first T in a record is less than 0.5 or the last T entered is greater than 1.5, T is assumed to be the phase shift angle and the impedance of each transformer winding assigned to the record is treated as a function of phase shift angle. Otherwise, the impedances of the transformer windings assigned to the record are made sensitive to off-nominal turns ratio.

Fields§

§i: i16

Impedance correction record number.

§t1: f64

Either off-nominal turns ratio in pu or phase shift angle in degrees. ti = 0.0 by default.

§f1: f64

Scaling factor by which transformer nominal impedance is to be multiplied to obtain the actual transformer impedance for the corresponding ti. fi = 0.0 by default.

§t2: f64§f2: f64§t3: f64§f3: f64§t4: f64§f4: f64§t5: f64§f5: f64§t6: f64§f6: f64§t7: f64§f7: f64§t8: f64§f8: f64§t9: f64§f9: f64§t10: f64§f10: f64§t11: f64§f11: f64