Description
The inductance matrix transformer (IMT) model reproduces the behavior of a three-phase linear transformer at power frequency. This model works with the Transformer Data Tab. Based on excitation and short-circuit tests in positive and zero sequences, the tool computes two matrices [R] and [L] modeling the transformer. The Ri and Li are the resistance and self inductance of each coil. Mij are the mutual inductances between coils. HYPERSIM simulates the transformer as mutually-coupled R-L branches.
Supports:
- A three-limb core representation
- A five-limb core representation
- Internal faults simulation (see 2-Winding Impedance-Matrix-Based Transformer with Internal Fault)
Does not support:
- A three single-phase core representation
- Saturation
Mask and Parameters
General Parameters
The base parameters are computed in the Transformer Data Tab.
| Description | Use this field to add information and pertinent details about the component |
| Base primary/secondary winding voltage (rmsLL) | Base value for PU conversion (kV) defined in Transformer Data Tab (kV) Voltage expressed in kV rms LL This base voltage and nominal voltage will change, if the corresponding winding connection switches between delta and Y. |
| Base power (total) | Base value for PU conversion (MVA) |
| Base frequency | Base value for PU conversion (Hz) |
Winding Parameters
The R and L matrices as well as the positive- and zero-sequence parameters are computed in the Transformer Data Tab.
| Primary/secondary connection | Winding type
|
| Rm - positive sequence | Defined in Transformer Data Tab (Ω) |
| Rm - zero sequence | Defined in Transformer Data Tab (Ω) |
| [R] | Leakage resistance matrix (Ω) |
| [L] | Leakage inductance matrix (H) |
Neutral Impedance Parameters
The neutral impedance parameters are computed in the Transformer Data Tab.
| R1, R2 | Neutral resistance of the winding; only applies to Y ground (Ω) |
| L1, L2 | Neutral inductance of the winding; only applies to Y ground (H) |
| C1, C2 | Neutral capacitance of the winding; only applies to Y ground (F) |
Transformer Data
To Learn How to Generate Transformer Parameters See:
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_N1 | Neutral connection for primary winding (supports only 1-phase connections) |
| Net_N2 | Neutral connection for secondary winding (supports only 1-phase connections) |
Inputs
- None
Outputs
- None
Sensors
- IPRIM(a,b,c,n): Primary current for each phase (A)
- ISEC2(a,b,c,n): Secondary current for each phase (A)
References
[1] Dommel, H., et al., Electromagnetic Transients Program Reference Manual (EMTP Theory Book), 1986
[2] A transformer model for winding fault studies, Partrick Bastard, Pierre Bertrand, Michel Meunier, IEEE, Vol 9, No 2, April 1994