this paper presents the application of the matching pursuit method to model synchronous generator. this method is useful for online analysis. in the proposed method, the field voltage is considered as input signal, while the terminal voltage and active power of the generator are output signals. usually, the difference equation with a second degree polynomial structure is used to estimate the co...

We propose and demonstrate an optical voltage sensing scheme based on a macrobending optical fiber in a ratiometric power measurement system. This novel approach to sensing has not been utilized before and has the advantage that the sensor involves simple fabrication compared to existing fiberoptic voltage sensors. To prove the feasibility of such a fiber-optic sensor, a sensor for a voltage ra...

A novel approach to the dynamic supply current sensing based on the measurement of voltage drop across a parasitic resistance of the supply voltage metal line is presented. Then, auto-zero technique for voltage comparator offset cancellation, which provides very accurate and sensitive low voltage measurement is proposed. Therefore, we may use this as a current monitor for dynamic current testin...

This paper presents a synchronized phasor measurement-based wide-area backup protection scheme which uses the magnitude of sequence voltages of buses at a system protection centre to identify the faulted bus closest to the fault and faulted line. The technique is tested for various faults including simultaneous faults in various systems with interconnections. The scheme is found to be accurate ...

Insulation is a crucial phenomenon for high voltage apparatus. Partial discharge activity affects the service life of the dielectrics. Therefore partial discharge must be less than a specified value for high voltage equipment. An accurate partial discharge measurement strongly depends on scaling of the measurement systems. It is a general method to use a partial discharge calibrator to calibrat...

Today uncertainties of a phase difference of two sinusoidal signals is commonly about 10 μrad for non coherent measurements and signal amplitudes up to several volts. Increasing voltage range of a phase meter requires special considerations. The construction of a special voltage divider intended for precise phase difference measurement is presented in this paper. The uncertainty contribution of...

Wide-range level shifters play critical roles in ultra-low-voltage circuits and systems. Although state-of-the-art level shifters can convert a sub threshold voltage to the standard supply voltage, they may have limited operating ranges, which restrict the flexibility of dynamic voltage scaling. Therefore, this paper presents a novel level shifter, of which the operating range is from a deep su...

the new phase-ii n-glucoside metabolites of butobarbitone and pentobarbitone are identified and quantified in human urine after single doses of these drugs. the identification and quantification of these metabolites were carried out by mass spectroscopy technique (accurate mass measurement and high voltage scanning). it was found that the butobarbitone n-glucoside comprised 26% of the dose with...

A new method is proposed to identify the location of transient events, including incipient faults, in power distribution systems, by using synchronized measurements from an emerging class sensors, called waveform measurement units (WMUs). WMUs capture voltage and current waveforms time domain. The consists three steps. first step characterize oscillatory modes components all captured WMUs, cond...

SSD (synchronized switch damping) is used for vibration control of the motorized spindle based on piezoelectric stack. Moreover, inspired by self-powered SSDI, a SSDV circuit was designed to overcome disadvantages requiring readjusting parameters and sensor re-positioning SSDI damping inductor) voltage source). A simulation an experimental were built, results show performance better than more f...