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Induction Machines - 3. Description of the Panel
Section Content
The simulator panel provides the test bench’s interactive interface, which includes access to settings, measurement device display and protection system status.
It allows users to manually control the bench, to start it and to regulate group speed by manipulating power, connecting various devices to the induction machine rotor, decoupling machine shafts to block the rotor or to reset the protection system in the event of a fault.
This section provides the complete reference for features located on the simulator panel.
3.1 Startup Panel
The main panel is shown in Fig. 3 at simulator startup.
Default setting values shown in Fig. 3 are applied, and control switches are grey, which means disabled.
Machines are stopped, all power output voltages are at 0 V.
The simulator is functioning, and the test bench can be used according to user needs, while maintaining the safe settings and making sure not to trip the protection system.
Figure 3: Panel at simulator startup
Observe, from left to right, in Fig 3, how the various settings and measurement display options are grouped according to the virtual test bench components, as described in Section 2:
DC machine: power settings, measurement display and protection status (fuses).
Shaft: for the detachable mechanical coupling of the shaft that connects the machines, displays torque and speed data.
Asynchronous Machine: electrical panel with fields to modify values, switches to control rotor winding connections and a rotary switch to modify external rotor resistances, measurement and protection (fuse) status displays.
Stator connections: command switches to activate or deactivate the induction machine’s stator connection with several devices.
AC Grid/Inverter/Measurement Resistors: three tabs that provide access to connect external devices to the induction machine’s stator (see Section 3.3).
AC Grid provides controls for an autotransformer connected to an infinite bus; Inverter provides controls for a battery powered, variable voltage and frequency PWM inverter, and Measurement Resistors provides measurements for the stator windings resistances.Protections: protection system control panel allows users to simulate a fuse reset (Reset) in the event of a fault.
Blowing one fuse can cause machines to stop according to the dynamics of turning parts caused by inertia and friction.
Just like with a real test bench, the user must determine the causes of the fault before restoring power and resetting switches to ensure safe restart.
Failure to do so will result in triggering the protection system again, as would happen with a real test bench!
The tabs in the bottom panel of the screen of Fig.3 display the oscilloscopes connected to the bench, as described in Section 3.4.
3.2 Tables for Parameters Setup and Control Switches
Parameter setting | Default value | Variation range |
SC1: Va DC Machine armature (Volt) | 0 | [0 ; 500] V |
SC2: Vf DC Machine field (Volt) | 0 | [0 ; 500] V |
SC3: Vdc external supply (Volt) | 0 | [0 ; 50] V |
SA1: Autotransformer (Volt) | 0 | [0 ; 500] V |
fs (Hz) AC grid frequency | 60 Hz | [1 ; 100] Hz |
Resistor value (Ω) | 1.5 Ω | 1.5 ; 2.5 Ω |
Inverter frequency (Hz) | 0 | [1 ; 90] Hz |
Table 3: User accessible setup parameters
Users can make precise adjustments using the controls to the right of the field.
FUNCTION | Icon | Description |
Command Switches | ||
K1: AC Grid | | The grid is not connected to the induction machine's stator. |
| The grid is connected to the induction machine's stator. | |
K2: Inverter | | The inverter is not connected to the induction machine's stator. |
| The inverter is connected to the induction machine's stator. | |
K3: Measurement Resistors | | The DC voltage source SC3 is not connected to the machine's stator. |
| The DC voltage source SC3 is connected to the induction machine's stator. Switch (K3) is closed. | |
K4: Open Rotor | | The induction machine's windings are short-circuited. |
| The synchronous machine's rotor windings are in open circuit. | |
K5: Rotor Resistor | | There is no external resistor connected to the induction machine's rotor. |
| External resistor, adjustable via dial on the induction machine's panel, are serially connected to the induction machine's rotor. Switch (K5) is closed. | |
K6: Decouple Shafts | | The shaft of the induction machine is driven by the shaft of the DC machine |
| The shaft of the induction machine is decoupled from the shaft of the DC machine | |
K7: Phase inversion | | The AC grid's phase sequence is positive. |
| The AC grid's phase sequence is negative (reverse). | |
K8: Reset | | Reset push-button is inactive. |
| Reset push-button is active and simulates a fuse replacement after a fault. | |
K10: Trig-Stator | | Waveforms are not triggered, and signals are moving. The Oscilloscope1 group trigger is disabled. |
| Waveforms are triggered. The stator voltage is acting as the reference signal. | |
K11: Trig-Rotor | | Waveforms are not triggered, and signals are moving. The Oscilloscope1 group trigger is disabled. |
| Waveforms are triggered. The rotor voltage Is acting as the reference signal. | |
Fuses | LED indicators | |
Fia Fia | | The DC machine's armature fuse is blown. |
| The DC machine's armature fuse is intact. | |
Fif Fif | | The DC machine's field fuse is blown. |
| The DC machine's field fuse is intact. | |
Fi1 Fi1 | | The induction machine's stator phase 1 fuse is blown. |
| The induction machine's stator phase 1 fuse is intact. | |
Fi2 Fi2 | | The induction machine's stator phase 2 fuse is blown. |
| The induction machine's stator phase 2 fuse is intact. | |
Fi3 Fi3 | | The induction machine's stator phase 3 fuse is blown. |
| The induction machine's stator phase 3 fuse is intact. | |