Ac-dc converter firing error detection
Ac-dc converter firing error detection
Each of the twelve Booster Main Magnet Power Supply modules consist of two three-phase, full-wave rectifier bridges in series to provide a 560 VDC maximum output. The harmonic contents of the twelve-pulse ac-dc converter output are multiples of the 60 Hz ac power input, with a predominant 720 Hz signal greater than 14 dB in magnitude above the closest harmonic components at maximum output. The 720 Hz harmonic is typically greater than 20 dB below the 500 VDC output signal under normal operation. Extracting specific harmonics from the rectifier output signal of a 6, 12, or 24 pulse ac-dc converter allows the detection of SCR firing angle errors or complete misfires. A bandpass filter provides the input signal to a frequency-to-voltage converter. Comparing the output of the frequency-to-voltage converter to a reference voltage level provides an indication of the magnitude of the harmonics in the ac-dc converter output signal.
- University of North Texas United States
Electromagnets, 43 Particle Accelerators, Diagnostic Techniques, Brookhaven Ags, Particle Boosters, Rectifiers, Power Conditioning Circuits, Errors, Power Supplies, Harmonics
Electromagnets, 43 Particle Accelerators, Diagnostic Techniques, Brookhaven Ags, Particle Boosters, Rectifiers, Power Conditioning Circuits, Errors, Power Supplies, Harmonics
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