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Three-Phase V-I Measurement
Measure three-phase currents and voltages in a circuit
Library
Extras/Measurements
Description
The Three-Phase V-I Measurement block is used to measure three-phase voltages and currents in a circuit. When connected in series with three-phase elements, it returns the three phase-to-ground voltages and the three line currents.
The block can output the voltages and currents in per unit (p.u.) values or in volts and amperes. If you choose to measure the voltages and currents in p.u., the Three-Phase V-I Measurement block does the following conversions:
Dialog Box and Parameters
- Voltage measurement
- Select no if you do not want to measure three-phase voltage. Select phase-to-ground if you want to measure the phase-to-ground voltages. Select phase-to-phase if you want to measure the phase-phase voltages.
- Use a label
- If selected, the voltage measurements are sent to a labeled signal. Use a From block to read the voltages. The goto tag of the From block must correspond to the label specified by the Signal label parameter. If not selected, the voltage measurements are available via the Vabc output of the block.
- Signal label
- Specifies a label tag for the voltage measurements.
- Voltages in p.u.
- If selected, the three-phase voltages are measured in p.u. Otherwise they are measured in volts.
- Base voltage (Vrms phase-phase)
- The base voltage, in volts rms, used to convert the measured voltages in p.u. The Base voltage (Vrms phase-phase) parameter is not visible in the dialog box if the Measure voltages Vabc in p.u./Vbase parameter is not selected.
- Current measurement
- Select yes if you want to measure the three-phase currents that flow through the block.
- Use a label
- If selected, the current measurements are sent to a labeled signal. Use a From block to read the currents. The goto tag of the From block must correspond to the label specified by the Signal label parameter. If not selected, the current measurements are available via the Iabc output of the block.
- Signal label
- Specifies a label tag for the current measurements.
- Currents in p.u.
- If selected, the three-phase currents are measured in p.u. Otherwise they are measured in amperes.
- Base power (VA 3 phase)
- The base power, in volt-ampere (VA), used to convert the measured currents in p.u. The Base power (VA 3 phase) parameter is not visible in the dialog box if the Measure currents Iabc in p.u./Pbase parameter is not selected.
- Output signal
- Specifies the format of the measurement signal when the block is used in a phasor simulation. The Output signal parameter is disabled when the block is not used in a phasor simulation. The phasor simulation is activated by a Powergui block placed in the model.
- Set to Complex to output the measured voltages and currents as complex values. The outputs are complex signals.
- Set to Real-Imag to output the real and imaginary parts of the measured voltages and currents.
- Set to Magnitude-Angle to output the magnitudes and angles of the measured voltages and currents.
- Set to Magnitude to output the magnitudes of the measured voltages and currents. The output is a scalar value.
Inputs and Outputs
- A, B, C
- Inputs 1, 2, 3 and outputs 1, 2, 3 are the phase connectors of the measurement block. Connect the Three-Phase V-I Measurement block in series with other three-phase electrical blocks.
- Vabc
- Output 4 is a vector containing the three measured phase-to-ground voltages.
- Iabc
- Output 5 is a vector containing the three measured line currents.
Example
See the psb3phseriescomp.mdl for a demo using the Three-Phase V-I Measurement block.
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