Power Quality and Related Issues

Power quality refers to maintaining the near sinusoidal waveform of power distribution bus voltages and currents at rated magnitude and frequency. Power quality describes the extent of variation of the voltage, current, harmonics, and frequency of the power system. The poor power quality effects industrial competitiveness drastically and thereby impedes our efforts to turn into […]

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Ground Fault Current Interrupter Protection Circuit

A ground fault circuit interrupter (GFCI) is a device that cuts off an electric power supply when it detects the ground fault in the system and hence prevents the system from severe damage. The GFCI monitors the current flowing into different phases and neutral. It turns off the power supply by sending a tripping signal […]

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Power Electronics: Introduction & Importance

Power electronics is a combination of two main branches of engineering i.e. power and electronics engineering. Power engineering deals with the generation, transmission, distribution, and utilization of electric energy at high power level whereas electronic engineering deals with the production, transmission, and reception of signals & data at low power level. Power engineering machines/apparatus are […]

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Comparison of Si, SiC, GaN and Sapphire Power Semiconductor Devices

Q. Compare suitability of Si, SiC, GaN, and Sapphire being used for Modern Power Semiconductor Devices? Ans. S.No. Characterisitcs Si SiC (3H)/SiC (6H) GaN Sapphire 1. Energy gap at 300K (eV) 1.12 2.23/2.9 3.2 5.47 2. Maximum operating temperature (°C) 300 873/1240 600 1100 3. Mobility at 300 K — electron — Hole   1350 430 […]

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Comparison of Thyristor, MOSFET & IGBT Devices

  S.No. Characterisitics Thyristor MOSFET IGBT 1. Type of Device Minority carrier Majority carrier Minority carrier 2. Rating very high Voltage, very high Current Medium Voltage, high Current high Voltage, high Current 3. Switching frequency low very high (~ MHz) high (~ 100kHz) 4. On-state drop low higher (increasing) low 5. On-state losses low considerable less […]

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