Phase-shifting Transformer

Description of the Phase-shifting Transformer component in Schematic Editor

The Phase-shifting Transformer is modeled as three Single Phase Three Winding Transformers, where the secondary winding of each single-phase transformer is connected to appropriate tertiary winding of the following single-phase transformer.

The magnetization inductance (Lm) is modeled on the primary side of the transformer and can be either linear or with saturation. Core losses are modeled as Rm resistance located on the primary side of the transformer.

Schematic symbol and input parameters for the Phase-shifting Transformer block are given in Table 1.

Table 1. Phase-shifting Transformer component in the Schematic Editor core library
component component dialog window component parameters

Phase- shifting Transformer
  • Input parameters option (SI or p.u.)
  • Core model option (Linear, Non-Linear, Rm/Lm neglected)
  • Nominal Power of the transformer in VA (Sn)
  • Nominal frequency in Hz (fn)
  • Nominal line to line voltage of winding x in volts RMS (Vx, x = 1, 2)
  • Angle between primary and secondary line to line voltage (phase shift = [-30, 30])
  • Resistance of winding x in ohms (Rx, x = 1, 2)
  • Leakage inductance of winding x in henries (Lx, x = 1, 2)
  • Resistance representing core losses, in ohms (Rm)
  • Magnetization inductance in henries (Lm)
  • Embedded coupling option (Ideal Transformer, None) - divides primary and secondary winding of the Phase-shifting Transformer into separate cores
  • Type of coupling component - defines whether the inserted coupling component is a core or a device coupling. This parameter is only available when HIL602 is used. Only one of the inserted coupling components can be a device coupling
  • Winding 1 connection (Y)

A schematic block diagram of the Phase-shifting Transformer block with the corresponding component arrangement and naming is shown in Figure 1.

It should be noted that terminal N1 can be connected with the rest of the circuit in Schematic Editor only if the corresponding side is wye (Y) connected.

Figure 1. The schematic block diagram and corresponding component names of a Phase-shifting Transformer

Figure 2 gives a schematic representation of transformer's equivalent circuit when embedded coupling option is enabled.

Figure 2. Representation of circuit division between cores when Embedded coupling is enabled
Table 2. Analog output signals from phase shifting transformer
Analog output variable name Description
Lm_a_name Current of magnetizing inductance in phase A
Lm_b_name Current of magnetizing inductance in phase B
Lm_c_name Current of magnetizing inductance in phase C
L1_a_name Current of phase A leakage inductance of winding 1
L1_b_name Current of phase B leakage inductance of winding 1
L1_c_name Current of phase C leakage inductance of winding 1
L2_a1_name Current of phase A leakage inductance of winding 2
L2_a2_name Current of phase A leakage inductance of winding 2
L2_b1_name Current of phase B leakage inductance of winding 2
L2_b2_name Current of phase B leakage inductance of winding 2
L2_c1_name Current of phase C leakage inductance of winding 2
L2_c2_name Current of phase C leakage inductance of winding 2