Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [phase-shift]

224 questions
15
votes
4 answers

Why does a delta/wye transformer make 30 degrees phase shift ?

I'v heard that a delta/delta or Wye/Wye transformers do not make any phase shift. In delta/wye or wye/delta transformers, There is a 30 degrees phase shift between the primary and secondary coils. So, Why is there a phase shift ? and Why is it 30…
Michael George
  • 3,742
  • 13
  • 53
  • 84
11
votes
6 answers

What is capacitive loading? (Intuitive understanding)

I have read about capacitive loading, but what does it actually mean intuitively? I just asked this question so as to get an intuitive answer and also know what should I understand when one says that a load is capacitive. Question 1: When we have a…
user220456
8
votes
4 answers

Why does current flow from the most positive to the most negative in three phase system?

I put the following circuit in a simulator to see how it works. I understood it but I have a question: At the time of the vertical green line, The simulator shows me that the current flows from the supply of phase 1 because it is the most positive.…
Michael George
  • 3,742
  • 13
  • 53
  • 84
7
votes
4 answers

Is my summary of parasitic oscillation in op-amps wrong?

We were discussing negative feedback in op-amps with my community college instructor. I tried to learn ahead about the concept of parasitic oscillations in feedback circuits. I wrote a summary of what I learned, but my instructor said (very…
ee_student
  • 447
  • 1
  • 2
  • 8
7
votes
3 answers

Is it possible to model a single-phase phase-shifting transformer in LTspice/Multisim/PSpice?

As you know, three-phase two-winding transformers can produce a phase-shift between the line-to-line or line-to-neutral phasor voltages of one side and the respective line-to-line or line-to-neutral phasor voltages of the other side. This is taken…
alejnavab
  • 959
  • 7
  • 18
7
votes
1 answer

Beam Steering range of a phased array antenna system

What is the beam steering range of a phased array dependent on? For example, if I use an antenna array of Nx1, with a phase shifter resolution of \$\frac{2\pi}{k}\$ and the antenna elements spaced at \$\frac{\lambda}{2}\$, what is the beam steering…
Vinay Kumar
  • 71
  • 1
7
votes
5 answers

90 Degree Phase shift at few MHz

I have a seemingly simple question but I've been doing a lot of searching and can't find an answer. What is a simple or standard way to achieve a 90 degree phase shift of an RF signal in the frequency range of ~1 MHz up to a few 10s or 100s of MHz?…
Jagerber48
  • 185
  • 1
  • 7
6
votes
5 answers

Why doesn't the bypass capacitor cause phase shift in this oscillator circuit?

I am trying to understand oscillator basics. I thought I already understood how a capacitor works, but I still get confused about it. This circuit is an RC phase shift oscillator. I understand that we need 3 capacitors to get a 180° phase shift in…
Darko
  • 73
  • 3
6
votes
1 answer

Is phase angle a important thing to consider when designing filters?

Whenever I was choosing values for filters I always ignored the phase angle plots, but should I be taking it into consideration when for example designing a high-pass filter for the input of an amplifier or a low-pass filter in the feedback network?…
Nathan Campos
  • 527
  • 1
  • 6
  • 15
6
votes
4 answers

Is it possible to phase shift a single harmonic rank without shifting the rest of the distored signal?

Let's suppose I have a voltage of 60 Hz, containing distortion due to 3rd, 5th and 7th harmonics (180Hz, 300Hz and 420Hz). Is it possible to phase shift the 3rd harmonic (for example) without shifting the rest of the signal ? If yes, how and using…
KADEM Mohammed
  • 125
  • 12
6
votes
6 answers

Why does a capacitor create a 90 degree phase shift of voltage and current?

First look at my circuit. The voltage source has a value of 5V with a phase angle of zero, and the capacitor's impedance is 5Ω. So the current is obviously 1A with a phase angle of 90°. What is the physical reason behind this phase shift? I can…
Raihan Khalil
  • 371
  • 5
  • 9
  • 22
5
votes
1 answer

How can power factor be reliably estimated given the phase error in current sense transformers?

The majority of mains power sensing devices I've seen (both commercial products and ICs) utilise a current sensing transformer. Many of them also calculate or estimate power factor. However, the phase error specified in the datasheets of almost…
Polynomial
  • 10,562
  • 5
  • 47
  • 88
5
votes
4 answers

Noise in tunable sine wave oscillator

I recently soldered a tunable phase-shift oscillator on a breadboard PCB. It produces a sine wave in the range from 80 Hz to 3.3 kHz. The oscillator frequency is tuned with a dual 100 kΩ potentiometer. Unfortunately there always is some kind of…
TonyDublov
  • 169
  • 6
5
votes
2 answers

Vector Voltmeters vs Oscilloscopes?

I have come across some electronic engineering papers from the mid 1970's where they were testing tunable phase shifters. To measure the phase shift they used a vector voltmeter. As this is not a bit a kit I have come across or is as readily…
Dave
  • 429
  • 4
  • 13
5
votes
2 answers

Finding phase shift between the voltage and current

I am trying to find the phase shift \$\phi\$ of this circuit. I am using the formula: $$\phi = \arctan{\left(\frac{X_{L}-X_{C}}{R}\right)}$$ Substituting in the values: $$\phi = \arctan{\frac{2000\Omega-4000\Omega}{6000\Omega}}$$ $$\phi =…
weno
  • 179
  • 8
1
2 3
…
14 15