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What is the fundamental frequency?
For a waveform containing harmonics, the harmonic frequencies are multiples of what is known as the 'fundamental' frequency. For example, for a waveform that contains 'third harmonics', the fundamental frequency is one-third the frequency of the harmonics. The fundamental frequency of vocal folds the speech mechanism as sound generator.
What are Total Harmonic Distortion and its effects on electrical system?
To put it simply, harmonics are unwanted, predictable, and repeatable noise riding on an electrical waveform. In power applications, harmonics can damage equipment, overheat transformers, and cause erratic operation. This is especially true if the harmonic is a multiple of the base frequency (100 Hertz, 150 Hertz, etc. for a 50Hz reference). Total Harmonic Distortion (THD) is a term to describe the total waveform distortion by all the harmonics present on the waveform. You should have as little as possible. Many power utilities require a THD limit at the point where a facilities connects to the utility.
What is the reason of harmonics in transformer and induction motor?
To be very brief, Harmonics are caused because of magnetising current flowing in the primary of transformer, which cause deaviation from the ideal sinusoidal waveform producing peaky currents in the primary. Due to this the core of the transformer gets saturated and the wave form produced in the secondary also gets distorted.
What are peripheral effects of power electronics equipments?
The operations of power electronic converters are mainly based on the switching of power semiconductor devices. Due to this the converters introduce voltage and current harmonics into the source as well as load. These harmonics can cause problems of distortion in the output voltage and current and also electromagnetic interference with the neighboring systems. To reduce these harmonics to an acceptable level it is necessary to introduce filters on the input and output of the converter. To evaluate the performance of the converter the quality of the waveform (voltage and current) needs to be measured using factors such as total harmonic distortion (THD), harmonic factor (HF) and input power factor (IPF). The implementation of proper control algorithm in the controller, generation of harmonics and distortion in the output waveform can be reduced. The switching of the power devices in power electronic converter can cause radio frequency interference due to electromagnetic radiation as a result gating circuits may generate erroneous control signals. This interference problem can be avoided by the use of grounded shielding.
1 If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is?
rectangular
Why even harmonics do not exits in ac machines?
Because the resulting voltage waveform is symmetric about the center of the rotor flux, no even harmonics are present in the phase voltage.
What is the fundamental frequency?
For a waveform containing harmonics, the harmonic frequencies are multiples of what is known as the 'fundamental' frequency. For example, for a waveform that contains 'third harmonics', the fundamental frequency is one-third the frequency of the harmonics. The fundamental frequency of vocal folds the speech mechanism as sound generator.
Explain how a discharging capacitor in an electronic divice produce complex waveform?
Explain how a discharging capacitor in an electronic divice produce complex waveform?
Which harmonics is present in full bridge rectifire?
Since the output of the rectifier is a close approximation of a sawtooth waveform, then all harmonics starting at the second harmonic are present in the full wave bridge rectifier output.
What type of sound wave is produed in violin?
The sound wave produced by a violin is a complex waveform with multiple harmonics. It is generated by the vibration of the strings, which are then transmitted to the body of the instrument and amplified through the resonance of the hollow body. This combination of harmonics gives the violin its unique and rich tone.
What are Total Harmonic Distortion and its effects on electrical system?
To put it simply, harmonics are unwanted, predictable, and repeatable noise riding on an electrical waveform. In power applications, harmonics can damage equipment, overheat transformers, and cause erratic operation. This is especially true if the harmonic is a multiple of the base frequency (100 Hertz, 150 Hertz, etc. for a 50Hz reference). Total Harmonic Distortion (THD) is a term to describe the total waveform distortion by all the harmonics present on the waveform. You should have as little as possible. Many power utilities require a THD limit at the point where a facilities connects to the utility.
How many times does an AC waveform cross the axis in one complete cycle?
For a simple sinewave and other simple waveshapes, twice: once going up and once going down. However for more complex waveforms it may be many times, depending on the relative amplitudes of the harmonics.
Why do complex non-sinusoidal signals produce greater bandwidth?
because they have more harmonics
How do you analyze complex waveform?
Using Fourier Analysis -which is too difficult to explain in this forum.
What is the difference between simple and complex waveforms?
simple waveform - something like a sine wave. Very pure sound like you used to get on the tv when that girl was sitting with the toys in the middle of the night. Complex waveform is like speech etc
Is the human arterial pressure waveform wider than the ECG waveform?
Yes. The EKG (or ECG) measures the electrical activity of the heart so the waveform (the QRS complex) reflects how fast the electrical impulse spreads through the heart. The heart actually takes longer than this to contract leading to a wider waveform.
What is wave analyser?
it is an instrument which is used to measure relative amplitudes of single frequency components of complex waveform.
