Multimeter (Power System Blockset)

Measure the voltages and currents specified in dialog box of Power System Blockset blocks.

Library

Measurements

Description

The Multimeter block is used to measure voltages and currents of the measurements described by the dialog box of Power System Blockset blocks.

The powerlib blocks listed in Table 4-7 have a special parameter (Measurements) that allow you to measure voltages or currents related to the block. Choosing voltages or currents through this measurement parameter is equivalent to connecting an internal voltage or current measurement block inside your blocks. The measured signals can be observed through a Multimeter block placed in your circuit.

Drag the Multimeter block in the top-level system of your circuit and double-click on the icon to open the graphical user interface (GUI).

Table 4-7: Power System Blockset Blocks with Internal Measurements
Block Name
Block Name

AC Current Source
Parallel RLC Branch

AC Voltage Source
Parallel RLC Load

Controlled Current Source
PI Section Line

Controlled Voltage Source
Saturable Transformer

DC Voltage Source
Series RLC Branch

Breaker
Series RLC Load

Distributed Parameter Line
Surge Arrester

Linear Transformer
Three-Phase Transformer (Two and Three Windings)

Mutual Inductance
Universal Bridge

**Table 4-7: Power System Blockset Blocks with Internal Measurements**
Block Name	Block Name
AC Current Source	Parallel RLC Branch
AC Voltage Source	Parallel RLC Load
Controlled Current Source	PI Section Line
Controlled Voltage Source	Saturable Transformer
DC Voltage Source	Series RLC Branch
Breaker	Series RLC Load
Distributed Parameter Line	Surge Arrester
Linear Transformer	Three-Phase Transformer (Two and Three Windings)
Mutual Inductance	Universal Bridge

Dialog Box and Parameters

Available Measurements: The Available Measurement listbox shows the measurements in the Multimeter block. Use the Select button to select measurements from the Available Measurements listbox. Use the Refresh button to update the list of available measurements in the Multimeter block.; The measurements in the list box are identified by the name of the block where the measurement is done. The type of measurement (voltage measurement, current measurement, or flux) is defined by a label preceding the block name. See the reference section of blocks listed in Table 4-7for a description of these measurements.
Selected Measurement: The Selected Measurements listbox shows the measurements sent to the output of the block. You can order the measurements by using the Up, Down, and Remove buttons. The +/- button allow you to reverse the polarity of any selected measurement.
Display signals at simulation stop: If checked, displays a plot of selected measurements using a MATLAB figure window. The plot is generated when the simulation stops.

Example

The following circuit uses a Multimeter block to measure the voltage at the secondary winding of a Saturable Transformer block and the currents flowing through two Series RLC Load block.

The circuit is available in the psbcompensated.mdl demo. A Multimeter block is dragged into the model. In the dialog box of the 250 MVA block, you set the Measurements parameter to All measurements (V,I,flux), In the 110 Mvar block, you set it to Branch voltage and in the 110 Mvar1 block, you set it to Branch voltage and current.

The Output of the Multimeter Block is connected to a Scope block in order to display the measurements during the simulation. In addition, you can also check the Display signals at simulation stop parameter to display a plot of selected measurements when simulation stops.

Open the Multimeter block dialog box, select the signals you want to observe, as shown on the Parameters and Dialog Box section of the Multimeter block. Notice the labels used to defined the available measurements in the Multimeter block. See the reference section of the Saturable Transformer block and Series RLC Load block for a description of these labels.

Start the simulation. After 0.4 sec., the simulation stops and a MATLAB figure window opens to display the selected measurements in the Multimeter block.

MOSFET Mutual Inductance