Protection of a embedded generator shaft system from an instantaneous voltage sag

2001 ◽  
Author(s):  
T. Funabashi
Keyword(s):  
Voltage Sag ◽  
Shaft System ◽  
Instantaneous Voltage

Detection of voltage sag sources based on instantaneous voltage and current vectors and orthogonal Clarke's transformation

2008 ◽  
Vol 2 (2) ◽  
pp. 219 ◽  
Author(s):  
B. Polajžer ◽  
G. Štumberger ◽  
S. Seme ◽  
D. Dolinar
Keyword(s):  
Voltage Sag ◽  
Instantaneous Voltage

Transient Instantaneous Voltage Sag of Distributed Generation Bus in Muangxay Substation, Oudomxay Province, Laos

2015 ◽  
Vol 752-753 ◽  
pp. 1170-1174
Author(s):  
Khamhyo Phothilath ◽  
Kittipong Tonmitr ◽  
Pramin Artrit
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Short Circuit ◽  
Electrical Equipment ◽  
Electromagnetic Transients ◽  
Voltage Sag ◽  
Voltage Waveform ◽  
Transient Problem ◽  
Instantaneous Values ◽  
Instantaneous Voltage

This paper presents the transient instantaneous voltage sag analysis of distributed generation (DG) in distribution system. The behavior of voltage sag is analyzed by using DigSILENT power factory software (DPFS). As affected by unsymmetrical fault of feeder 2, the calculation of initial condition carries out through instantaneous values (electromagnetic transients). The simulation results show that instantaneous voltage sag affects the DG and operation of electrical equipment. The phase short circuit affects the voltage waveform, varies from the original waveform and caused the flicker transient problem.

Amplitude Distributions of Cochlear Microphonic Response to an Acoustic Sinusoid in Noise

1968 ◽  
Vol 11 (1) ◽  
pp. 63-76
Author(s):  
Donald C. Teas ◽  
Gretchen B. Henry
Keyword(s):  
Small Amplitude ◽  
Basilar Membrane ◽  
Spectral Composition ◽  
Pass Band ◽  
Cochlear Microphonic ◽  
Filter Output ◽  
Electronic Filter ◽  
Low Pass ◽  
Band Pass ◽  
Instantaneous Voltage

The distributions of instantaneous voltage amplitudes in the cochlear microphonic response recorded from a small segment along the basilar membrane are described by computing amplitude histograms. Comparisons are made between the distributions for noise and for those after the addition to the noise of successively stronger sinusoids. The amplitudes of the cochlear microphonic response to 5000 Hz low-pass noise are normally distributed in both Turn I and Turn III of the guinea pig’s cochlea. The spectral composition of the microphonic from Turn I and from Turn III resembles the output of band-pass filters set at about 4000 Hz, and about 500 Hz, respectively. The normal distribution of cochlear microphonic amplitudes for noise is systematically altered by increasing the strength of the added sinusoid. A decrease of three percent in the number of small amplitude events (±1 standard deviation) in the cochlear microphonic from Turn III is seen when the rms voltage of a 500 Hz sinusoid is at −18 dB re the rms voltage of the noise (at the earphone). When the rms of the sinusoid and noise are equal, the decrease in small voltages is about 25%, but there is also an increase in the number of large voltage amplitudes. Histograms were also computed for the output of an electronic filter with a pass-band similar to Turn III of the cochlea. Strong 500 Hz sinusoids showed a greater proportion of large amplitudes in the filter output than in CM III . The data are interpreted in terms of an anatomical substrate.

Sign in / Sign up

Export Citation Format

Share Document