Fault Definition and 124 Threads

Hi, When calculating a line-line fault, I understand that the Positive and Negative Phase Sequence networks are placed in parallel with each other as shown in the first attached image, and that the zero phase sequence is excluded. Although this is connected in parallel, does it not produce a...

Dear everyone, Can anyone explain how variation of Stacking Fault Energy(SFE) for different Face Centered Cubic(FCC) materials affect the stain hardening rate? For example SFE of aluminium is 250 mJ/m^2 and that of stainless steel is 9 mJ/m^2. Can you please explain which material has higher...

Hello again, I've got another question that involves symmetrical components, this time I've attempted it. The Question follows: 1. In a 3 phase circuit with resistance earthed and neutral and Earth fault in phase “A” which produces a fault current of 800 amps. Load currents may be taken as...

Hello all! I am carrying out the theoretical (that is, by calculation means) unsymmetrical fault calculations for three winding transformer. It is to my understanding that for the zero sequence impedance for a three winding transformer depends on the winding connections of the generator and...

Hi, I'm working on a project to make a fault locating system on HV and MV (11kv to 220kv, 33kv first). I'm try to make a device that can be directly mounted to the line (Mount on live bare conductors) to detect the fault in the power line and send a radio signal to devise mounted on the pole...

Hi, What I have been trying to achieve is learn about signal processing ,particularly filters. Newbie to DSP,so far! I have 2 signals with me.Voltage and current signals. Both are unfiltered. I have managed to filter out these two signals to remove most of the noise. Now,I want to find the...

Hi all! I am currently learning fault study in power systems. To my understanding- In any network (symmetrical or unsymmetrical) , there would be 3 components- positive sequence component, negative sequence component and zero sequence component. Question: For generators and transformers ...

Dear all, There is a “error report” when I use “mpirun” to run vasp.5.2 (a kind of DFT software) as follows: "mpirun noticed that process rank 2 with PID 16380 on node wangtc exited on signal 11 (Segmentation fault)." I can't solve it all the time,can anyone help me ? Thanks...

i have a TT earthing system and to decrease the resistance of the system I'm connecting the rods in parallel. i have the earthing conductor connected but as a mean of security, I'm thinking of connecting a second earthing conductor from the rod to the main Earth bar. Does this cause a any...

// Example of variable argument number function call and return adress deviation programm // never program in a style like this #include<stdio.h> #include<string.h> #include<stdlib.h> void (*ret)(); void replaceexit(void);void prtarg(char *arg, ...) { char **stack=&arg; printf("Return adr ...

Hi all, I have simulated (both in software and experimentally) inter-turn winding short-circuit fault in a single-phase transformer (working as a stand alone unit). I have the following observation but don't know the reason behind it:- The fundamental component in the no-load current is...

so calculating FC on an infinite bus is easy but how do you calculate it by hand for a finite bus? here is the concept i am having an issue understanding: let say i have a transformer that is 225KVA with 5%z and 3 phase 480 to 208. with infinite bus i have 12491A available on the...

I am trying to draw the bounce diagram for the trans line in the picture attached to my thread. Sorry won't let me upload... https://www.dropbox.com/home#!/lightbox/home/Year%202/Semester%202/mbgm9mw6 I am not sure what to do here because I have never seen anything like it before. It...

Hi, I have a power systems protection assignment and I wanted to get some simple calcs verified. XFMR - 30MVA, 132kV:22kV; Star/Delta respectively. star neutral is floating, not that it matters for this part. reactance is 8% and resistance is 0.5% on the 30MVA base. Basically I am...

hi could someone please explain the attached circuit to me in detail. From what i understand: the open circuit caused by the opened switch in series with the resistance causes a fault current in the system. This higher than normal current across the 200 ohm resistor causes a high...

Homework Statement Calculate the three-phase short-circuit fault currents flowing into all five busbars. Homework Equations MVA base = 150MVA All base voltages were set to the local busbar voltages. Formulas I have used can be seen in the attached photos. The Attempt at a...

Hi All, Good morning. we had a 20MW, 13.8 KV wye generator and it has a neutral grounding resistor. Some how we failed to connect the neutral grounding resistor and during a rain storm we burnt the generator. Even though the neutral is not connected to the neutral grounding resistor it was...

I have written a C program that produce a structure, give it's elements their initial values and change these values when neccessary.I can compile my program but when I try to run it,error:"segmentation fault(core dumped)" appears.I commented different parts of my program and I underentood the...

I'm try to read some files in subdirectories and create some other files in my present location: program multiread ! implicit none !variables integer :: n, k, i integer :: j, m2 real(8) :: pratio, crap, rmsttv character(len=42) :: filein(98) character(len=10) :: fileout(14)...

Homework Statement when I am compiling my code I am getting a segmentation fault when entering in input but I don't know why? it prints Segmentation fault: 11 Homework Equations The Attempt at a Solution This is my code I tried looking up what was causing it but couldn't...

Homework Statement Calculate the fault level for a 3Ø fault at F With bus section CB closed With bus section CB openHomework Equations The circuit diagram can be found here http://s1167.photobucket.com/albums/q629/sayeen1/?action=view&current=fault_level.png The Attempt at a Solution The...

please help me with a c code for the merge sort... and i am getting a segmentation fault in running this selection sort,,, please help... #include <stdio.h> int main( ) { int arr[10]; int i,j,temp; for ( i = 0 ; i<10 ; i++ ) { printf("enter the numbers: \n"); scanf("%d \n", arr[i]); } for (...

Hi, I am having a segmentation fault error just when I ask the code to print the value ipos in the program. However, If I change the print to the module, the segmentation fault does not appear. Could anyone can help know, why I can not transfer the variable ipos from the module to the main...

Hi all ! I am new to fortran. Please see the following code. It is a simple code to pass an array to a subroutine and print it, but doesn't behave that way: program exp_realloc implicit none integer,allocatable,dimension(:,:):: array integer::i,j...

I would like to know relevant materials/links that would help ma further my research in fault analysis.Thanks

I'm getting a "Segmentation fault: 11" when running at line 72: IF (h_temp == blayer) THEN However, the line above it: PRINT *,h_temp==blayer runs just fine. Needless to say, I'm clueless. Here's my entire code. PROGRAM bunkers IMPLICIT NONE REAL, DIMENSION(5) ...

Homework Statement I'm trying to read a string from cin. When it hits the "cin >> strWord" statement, I get the following error message: Segementation fault (core dumped). The input file is named "data4nine". I'm really not sure what a segmentation fault is and why I'm getting it The...

dear all, i have a code with line segmentation fault error. please anyone advice me how to debug this code. thank you... Mentor note: Added code tags, combined numerous variable declarations, and indented some do loops !##################################################################...

there is something strange in my lt-spice when i build my circuit mosfet with voltage divider + NO Rs (@Source Lead) i did not get the corresponding Id current WHY? my parameter: R1=R2=100K Rd=400 Id=10 mA where i used IRF510 with Kn= gfs^2 / 4Id = (1.3)^2 / (4 * 3.4 ) = 124 mA/v2 i...

Hi, Maybe this is a stupid question, but I've been wondering about this all day. In my book, they only explain the isolation transformer really brief. As far as I understand, the main of the transformer has a neutral which is grounded, if you touch that, the current will flow through...

I live less than a mile from the SAFZ near Frazier Park, and would like to identify related surface features like escarpments, tuff outcrops, etc. After much Googling, I have found no maps that would help me locate the identified fault line locations within even 1000ft. None. Has anyone here...

Hi everyone, I've discovered quite a strange function in my textbook. I compared the calculator's calculated derivatives (Math->nDriv) with my calculus derivative and found that the two are almost 2000 units off! Up until now I've been trying to figure out the problem, but to no avail, I cannot...

Hi, I am new in fortran. I have this code in fortran 90, I get segmentation fault when I run my program, can you help me please, I am desperate! SUBROUTINE COUNTX(NX,ncov) IMPLICIT NONE INTEGER, INTENT(IN)::ncov INTEGER,DIMENSION(ncov),INTENT(INOUT)::NX(:) INTEGER...

Good morning Gentlemen (and Ladies), I'm looking for some help from you HV experts out there. I have had an event where it is believed that a flooded transformer connection box induced a fault on to a 33kV 3phase transmission line, and the fault current was enough for the repulsive forces...

1. I have a segmentation fault when I try to run a program I have written in Fortran. The compiler I used is gfortran. What typically causes a segmentation fault, and how do I find where the problem is? I know I should use a debugger, but I don't know which debugger I should use, how to get it...

If a hot power line hits the ground, and you are touching the neutral line with your hands and the ground with your feet, would you get shocked? Also, same question, except the lines are coming out of a grounded portable generator instead of the electric company.

I've declared an unsigned long long bidimentional matrix: //(...) typedef unsigned long long int64; //(...) row = pow(2,17); col = 200; int64 Z[row][col]; Z[0][0] = 12345678; When the program is initializing Z[0][0], I got a "segmentation fault" message. The Insight Debugger suggests the...

Last time I was talking about Isolated Voltage, and some of you people were really helping me about, but I posted (did) something stupid and got the thread deleted. I am sorry for that. Now, I want to talk about my confusion in a different (safe) way. The above figure shows a...

I use gcc to compile the code. When I run the program, I get segmentation fault (core dumped). ranked_galaxies.txt: # PGC Name RA DEC Mass Distance Diameter Tile_Number Rank_stat 37617 NGC3992 179.399700 53.374450 2.290868 22.909000 5.613000 1 2.51796409431e-05 62964 IC4837A...

http://www.huffingtonpost.com/2011/01/31/trivalley-university-soca_n_816623.html Is it the students' fault for enrolling to the university? Should the American consulate be blamed for issuing the visas? And why are the students detained with ankle bracelets? Is this U.S. law?

Hi all, what is different between ELCB and Earth Fault Relay? why there is a need to change from eLCB to Earth Fault Relay? thanks

I'm trying to write a program in C++ that reads, writes, adds and substracts numbers entered as C-style strings. I have two questions. Is it necessary that the parameters of the + operator only be always objects of a class? Can an operator call another operator from within it, e.g. my_float...

Oh noes! I wrote a code on my mac, it works fine, and then I move it onto my linux machine, it compiles fine (using g++ command), but then when i run it i get a "segmentation error." I've look around a bit online and I couldn't find anything which seems to fit this particular error. I can...

Hello I need some help. In our 50MVA, 132/33 kV star/star transformer, at the time of charging from HV side, the transformer trips on REF (restricted Earth fault) due to magnetizing inrush current. Rated current: 218.7 Amp Line CT ratio: 800/400/200/1 Amp tap selected...

When I run a program on Ubuntu (10.04 x64) I receive a warning of segmentation fault. But when on windows (seven, x64), I do not receive this error. This program was compiled with gfortran on both systems. Any ideas why? Program Lennard Implicit None Double Precision...

Hi, I want to do the following calculation: c_{m,n} = \int_{-\infty}^{\infty} t^m \phi(t-n)\,dt I know three things: I know the values of c_{m,n} for m={0,1} and the first 4 for m={2,3} I know that my \phi is symmetric, i.e. \phi(t) = \phi(-t) The Fourier transform of \phi(t)...

(e2Pi i)i = 1 (e2Pi i)i = e(2Pi i)*i = e -2Pi2

I was looking at this fox News report regarding Bullock / James scandal http://www.youtube.com/watch?v=EgG9ZWaSZrE&feature=popular it seems to me that family laws, presumably thought to protect and encourage the institution of family are becoming the biggest reason not to ever get...

(I moved this from the Homework section. I hope it is okay I am posting here.) Homework Statement We are given six cross sections each spaced 2km apart and from these we are supposed measure the slip of the fault, and map the hanging-wall and footwall cutoffs to another worksheet that is...

Homework Statement We are given six cross sections each spaced 2km apart and from these we are supposed measure the slip of the fault, and map the hanging-wall and footwall cutoffs to another worksheet that is the map view of the cross sections. Once we have mapped all of the cutoffs and...