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Phase-Shifting Zigzag Transformer
- Sylvain Ménard
- Etienne Leduc
Description
In the phase-shifting transformer, the primary and tertiary windings are connected to form a zigzag. The phase shift is specified with respect to the reference winding.
Mask and Parameters
General Parameters
| Description | Use this field to add all kinds of information about the component |
|---|---|
| Base primary/secondary/tertiary winding voltage (rmsLL) | Base value for PU conversion (kV).
|
| Base power (total) | Base value for PU conversion (MVA) |
| Base frequency | Base value for PU conversion (Hz) |
Magnetization Impedance Parameters
- Rm: Equivalent resistance of iron losses of the magnetic circuit (Ω)
- Lm: Magnetization inductance (H)
Winding Parameters
| Secondary connection | Winding type
|
|---|---|
| Voltage (rmsLL) | Rated voltage of the winding (kV)
|
| R1, R2, R3 | Leakage resistance of the winding (Ω) |
| L1, L2, L3 | Leakage resistance of the winding (H) |
Zigzag Parameters
Phase shift | Amplitude of the phase shift with respect to the reference winding; must be positive (deg) |
|---|---|
| Voltage (rmsLL) | Rated voltage of the zigzag winding (kV) |
| Voltage phase-shift type | Direction of the phase shift with respect to the reference winding (None, Lagging, Leading) |
Neutral Impedance Parameters
| R2 | Neutral resistance of the secondary winding; only applies to Y ground (Ω) |
|---|---|
| L2 | Neutral inductance of the secondary winding; only applies to Y ground (H) |
| C2 | Neutral capacitance of the secondary winding; only applies to Y ground (F) |
Ports, Inputs, Outputs and Signals Available for Monitoring
Ports
| Net_1 | Primary winding connection (supports only 3-phase connections) |
|---|---|
| Net_2 | Secondary winding connection (supports only 3-phase connections) |
| Net_3 | Tertiary winding connection (supports only 3-phase connections) |
| Net_N | Neutral connection for secondary winding (supports only 1-phase connections) |
Inputs
- None
Outputs
- None
Sensors
| ILMAG(a,b,c) | Magnetization current for each phase (A) |
|---|---|
| IPRIM(a,b,c) | Primary current for each phase (A) |
| ISEC2(a,b,c) | Secondary current for each phase (A) |
| ISEC3(a,b,c) | Tertiary current for each phase (A) |
Additional Information
The secondary winding corresponds to the winding that does not have the zigzag connection. The zigzag winding is split in two parts: Z (primary) and Y (tertiary) according the following equations:[1]
The following example shows the use of the equations as well as the connection diagram of the transformer Zy with phase angle -7.5 degrees (see previous ZigZag parameters image where the transformer data is shown)
Base primary winding Voltage = 10.735 kV (rms LL), Base secondary winding Voltage = 693 V (rms LL), Base Tertiary winding Voltage = 639 V (rms LL):
The vector diagram of this transformer (referred to the ZigZag side) is shown in the following figure
Reference
[1] H.K. Hoidalen and R. Sporild, Using Zigzag Transformers with Phase-shift to reduce Harmonics in AC-DC Systems, International Conference on Power SystemsTransients (IPST’05) in Montreal, Canada on June 19-23, 2005
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