See Also
The Single Fault page is where the type and location of a single detailed fault are specified, and where the results of the detailed fault analysis can be seen in tabular format.
Fault Location
Choose to perform the fault at a bus location, or at a point somewhere on a line. If Bus Fault is selected, the only information needed is the bus number, which needs to be entered in the Fault Bus field. If an in-line fault is desired, the from and to bus numbers, circuit ID, and location of the fault (entered in percent of total line length, measured from the From Bus) will need to be given. Selecting the Fault… option from the bus or line local menus will automatically set up the Fault Location fields.
Fault Type
Choose from one of four types of fault to calculate at the fault location:
Single Line - to - Ground Computes a single phase line - to - ground fault using a user defined ground fault impedance. The phase evaluated is always referenced as phase A.
Line - to - Line Computes a line - to - line fault, assuming an impedance of 999 + j999 to ground. Phases B and C are always referenced as the faulted phases.
3 Phase Balanced Balanced three-phase line fault - to - ground using a user-defined ground fault impedance.
Double Line - to - Ground Computes a line - to - line - to - ground fault, using a user defined ground fault impedance.
Fault Current
Displays the magnitude and angle of the current at the fault location during the fault. The units of the fault current can be set to either per unit (p.u.) or Amps.
Subtransient Phase Current
Displays the magnitude and angle of the subtransient phase current A, B and C at the fault location during the fault. The units of the subtransient phase current can be set to either per unit (p.u.) or Amps.
Calculate
Pressing this button will run the fault analysis. In order for the results to be calculated, the power flow has to be in a solved state for the results to have any relevance. Therefore the first thing performed when Calculate is pressed is to solve the power flow. You can observe this by viewing the Message Log when you run the calculation. Once the power flow has been solved, then the fault analysis calculations are run and the results displayed.
Clear
Pressing Clear will clear any fault analysis results currently in memory and displayed on the dialog.
There are also six informational displays at the bottom of this dialog for showing the fault analysis calculation results:
Y-Bus Matrices