saulat feroz | University of Engineering & Technology Lahore, Pakistan (original) (raw)
Papers by saulat feroz
Power transformers can come up short from dielectric hassles brought on by electromagnetic drifte... more Power transformers can come up short from dielectric hassles brought on by electromagnetic drifters. In this paper, we concentrate on a exceptional sensation where intemperate overvoltages emerge because of reverberation. This circumstance can happen when a transformer on the high-voltage side is associated with a link and the low-voltage side is unloaded.Very high overvoltages can then result on the lowvoltage side from transient occasions that cause a feebly weakened overvoltage on the link with a prevailing recurrence coordinating a reverberation top in the transformer voltage proportion. Lab tests on a 11-kV/230 V appropriation transformer demonstrate that a stage voltage excitation on a 27m link creates 24-p.u. overvoltage on the open low-voltage side. The voltage waveforms are precisely replicated by a discovery model got from recurrence clear estimations. Recreations demonstrate that overvoltages as high as 43 p.u. could happen with the most unfavorable link length. It is further indicated that the accompanying circumstances can prompt high overvoltages on an emptied transformer low-voltage side: 1) ground flaw start at the far link end, 2) link empowerment from a busbar with a few different links associated, 3) link empowerment from another link with the same length, and 4) capacitor bank empowerment at the far link end. KEYWORDS_ -dielectric hassles, overvoltage, overcurrent, power transformer, busbar, capacitor bank.
A circuit breaker is an automatically operated electrical switch designed to protect an electrica... more A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
It is very important task to control the speed of DC motor for various applications. Also the sho... more It is very important task to control the speed of DC motor for various applications. Also the shorter settling time is desired for practical applications. In this paper it is presented the realization of the speed control by using Pulse Width Modulation. For setting the desired speed of the motor, it isndesigned a windows application programmed with C# language. This application communicates with 8051 microcontroller through standard PC serial port. Connection of DC motor with hardware is also explained.
Nowadays, the increasing use of power electronics equipment origins important distortions. The pe... more Nowadays, the increasing use of power electronics equipment origins important distortions. The perfect AC power systems are a pure sinusoidal wave, both voltage and current, but the ever-increasing existence of non-linear loads modify the characteristics of voltage and current from the ideal sinusoidal wave. This deviation from the ideal wave is reflected by the harmonics and, although its effects vary depending on the type of load, it affects the efficiency of an electrical system and can cause considerable damage to the systems and infrastructures. Ensuring optimal power quality after a good design and devices means productivity, efficiency, competitiveness and profitability. Nevertheless, nobody can assure the optimal power quality when there is a good design if the correct testing and working process from the obtained data is not properly assured at every instant; this entails processing the real data correctly. In this book the reader will be introduced to the harmonics analysis from the real measurement data and to the study of different industrial environments and electronic devices.
This Section covers the design of power transformers used in buck-derived topologies: forward con... more This Section covers the design of power transformers used in buck-derived topologies: forward converter, bridge, half-bridge, and full-wave centertap. Flyback transformers (actually coupled inductors) are covered in a later Section. For more specialized applications, the principles discussed herein will generally apply.
The Power Systems Engineering Research Center (PSERC) is a multi-university Center conducting res... more The Power Systems Engineering Research Center (PSERC) is a multi-university Center conducting research on challenges facing the electric power industry and educating the next generation of power engineers. More information about PSERC can be found at the Center's website: http://www.pserc.org.
All instrument transformers are provided with polarity marks on certain primary and secondary ter... more All instrument transformers are provided with polarity marks on certain primary and secondary terminals. In ANSI/IEEE C57.13, American National Standard Requirements for Instrument Transformers, polarity is defined as follows:
Power transformers can come up short from dielectric hassles brought on by electromagnetic drifte... more Power transformers can come up short from dielectric hassles brought on by electromagnetic drifters. In this paper, we concentrate on a exceptional sensation where intemperate overvoltages emerge because of reverberation. This circumstance can happen when a transformer on the high-voltage side is associated with a link and the low-voltage side is unloaded.Very high overvoltages can then result on the lowvoltage side from transient occasions that cause a feebly weakened overvoltage on the link with a prevailing recurrence coordinating a reverberation top in the transformer voltage proportion. Lab tests on a 11-kV/230 V appropriation transformer demonstrate that a stage voltage excitation on a 27m link creates 24-p.u. overvoltage on the open low-voltage side. The voltage waveforms are precisely replicated by a discovery model got from recurrence clear estimations. Recreations demonstrate that overvoltages as high as 43 p.u. could happen with the most unfavorable link length. It is further indicated that the accompanying circumstances can prompt high overvoltages on an emptied transformer low-voltage side: 1) ground flaw start at the far link end, 2) link empowerment from a busbar with a few different links associated, 3) link empowerment from another link with the same length, and 4) capacitor bank empowerment at the far link end. KEYWORDS_ -dielectric hassles, overvoltage, overcurrent, power transformer, busbar, capacitor bank.
A circuit breaker is an automatically operated electrical switch designed to protect an electrica... more A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
It is very important task to control the speed of DC motor for various applications. Also the sho... more It is very important task to control the speed of DC motor for various applications. Also the shorter settling time is desired for practical applications. In this paper it is presented the realization of the speed control by using Pulse Width Modulation. For setting the desired speed of the motor, it isndesigned a windows application programmed with C# language. This application communicates with 8051 microcontroller through standard PC serial port. Connection of DC motor with hardware is also explained.
Nowadays, the increasing use of power electronics equipment origins important distortions. The pe... more Nowadays, the increasing use of power electronics equipment origins important distortions. The perfect AC power systems are a pure sinusoidal wave, both voltage and current, but the ever-increasing existence of non-linear loads modify the characteristics of voltage and current from the ideal sinusoidal wave. This deviation from the ideal wave is reflected by the harmonics and, although its effects vary depending on the type of load, it affects the efficiency of an electrical system and can cause considerable damage to the systems and infrastructures. Ensuring optimal power quality after a good design and devices means productivity, efficiency, competitiveness and profitability. Nevertheless, nobody can assure the optimal power quality when there is a good design if the correct testing and working process from the obtained data is not properly assured at every instant; this entails processing the real data correctly. In this book the reader will be introduced to the harmonics analysis from the real measurement data and to the study of different industrial environments and electronic devices.
This Section covers the design of power transformers used in buck-derived topologies: forward con... more This Section covers the design of power transformers used in buck-derived topologies: forward converter, bridge, half-bridge, and full-wave centertap. Flyback transformers (actually coupled inductors) are covered in a later Section. For more specialized applications, the principles discussed herein will generally apply.
The Power Systems Engineering Research Center (PSERC) is a multi-university Center conducting res... more The Power Systems Engineering Research Center (PSERC) is a multi-university Center conducting research on challenges facing the electric power industry and educating the next generation of power engineers. More information about PSERC can be found at the Center's website: http://www.pserc.org.
All instrument transformers are provided with polarity marks on certain primary and secondary ter... more All instrument transformers are provided with polarity marks on certain primary and secondary terminals. In ANSI/IEEE C57.13, American National Standard Requirements for Instrument Transformers, polarity is defined as follows: