4.1 Three-Phase Sinusoidal Signal Emulation
In this application, input to the Phase Sequence Detector is a three-phase AC input. Detection of the phase sequence, phase loss, and RMS voltage calculation of the input supply are the fundamental functionalities of the application.
As discussed in the Application Overview section, the demo is using a waveform emulator to substitute the three-phase power supply. The following characteristics are required from the emulated signal to demonstrate the application.
- Three-phase signal (L1-L2-L3)
- Configurable amplitude
- Configurable phase-shift
- Configurable frequency
To accomplish the above features a three-phase emulator is realized using waveform click from MikroElektronika. The waveform click can generate the sinusoidal waveform with configurable frequency, phase, and amplitude. Three waveform clicks are used to generate the required three-phase sinusoidal signal with 120° phase-shift which is fed as input to the phase sequence detection system. The emulated three-phase sinusoidal signal with the provision of changing the waveform configurations in run-time helps in demonstrating all the features of implemented Phase Sequence Detection system efficiently.
Figure 4-2, ‘a’ showcases the emulated three-phase signals, which is used for the application demonstration. It consists of three signals with a 50 Hz frequency and a 120° phase shift in between the signals.
Figure ‘b’ showcases the emulated three-phase signals with a 60 Hz frequency.
Figure ‘c’ showcases the emulated three-phase signals with L1 phase loss. It consists of three signals with different frequencies: L1 with 0 Hz, L2 and L3 with 50 Hz.
Figure ‘d’ showcases the emulated three-phase signals with L2 phase loss. It consists of three signals with different frequencies: L2 with 0 Hz, L1 and L3 with 50 Hz.
Figure ‘e’ showcases the emulated three-phase signals with L3 phase loss. It consists of three signals with different frequencies: L3 with 0 Hz, L1 and L2 with 50 Hz.