# Questions tagged [symmetrical-components]

Three-phase circuit analysis involving Fortescue's symmetrical component method of solving unbalanced conditions. The method replaces the three-phase unbalanced network with three balanced networks (positive sequence, negative sequence, and zero sequence) for calculation.

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### Circuit reduction: Voltage across terminals [closed]

I'm new to electrical engineering and there is debate in my class about a problem. We are asked to find the voltage across A and B after reducing the circuit. Circuit is symmetrical. Information given:...
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246 views

### What does "R0, X0, R1, X1" in the Ieee 2015 low voltage test feeder mean? [closed]

I'm looking at the Line Code downloaded from https://cmte.ieee.org/pes-testfeeders/resources/, 2015 test feeder cases, European Low Voltage Test Feeder. Here I have a screenshot of the LineCode Excel ...
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### What type of an induction motor is used in a single-phase non-inverter household refrigerator?

There are many pictures with the 2-phase non-symmetrical (start winding and main winding) on the internet in a single-phase non-inverter household refrigerator. What type of squirrel cage induction ...
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1 vote
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### How to decompose the three phase unbalanced grid into the symmetrical components?

Let's I have three phase voltage grid which is unbalanced. The phase voltages are sampled by the adc and I would like to determine in the C language software the positive sequence, negative sequence ...
• 1,071
484 views

### Actual Line-to-Line voltage from per unit value

In this question, I am able to find the per unit phase voltages using the symmetrical components. Taking the base MVA and base voltage to be the same as that of the alternator, \\$ (I_a)_1 = \frac{E_a}{...
83 views

### How did they arrive at an expression for resistance given the power of the load?

In Anderson's 1995 Analysis of Faulted Power Systems, there is the below example I am required to calculate the sequence network for the fault occurring at C. To calculate the resistance of the load, ...
1k views

### Sequence Impedance/Zero Sequence Impedance of lines

I am trying to calculate the Sequence Impedance/Zero Sequence Impedance of couple of lines, but Im not sure if the calculation are right, and besides there are some tricky things on the data provided. ...
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1k views

### How to transform the line voltages to the phase voltages in control software?

Let's say I am measuring line voltages of the three phase grid 400V/50Hz via three instrument transformers whose secondary windings are connected to the adc of my microcontroller i.e. I have following ...
• 1,071
762 views

### Calculate zero sequence voltage and current in a HV network with one source and two feeders

My goal is to prove the direction and magnitude of Uo and Io seen by the two protection relays during a single phase to earth fault in LINE 1. By my understanding this can be done by setting up a ...
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228 views

### Symmetrical Components - Three-phase D-Y transformer with unbalanced voltage and loads

I have a Delta-Wye transformer, N1/N2 = 4, and am trying to solve the circuit below, with 120VAC applied to terminals VAB only. On the secondary I have 1 ohms connected between a-n and 5 ohms between ...
1 vote
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### Zero Sequence current Understanding

In literature zero sequence current is called DC component. If it was DC component then how a zero sequence current in neutral grounded secondary of a transformer cause current in neutral grounded ...
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