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bus-3001 to bus-3003 unbalanced fault in official file 'savnw' cannot be added successfully.

asked 2018-04-29 05:38:01 -0500

AlexYang gravatar image

what my operation process is:

1)open savnw.sav

2)click "Power Flow -> Solve", check in "Convert Generators" and "Convert/Reconstruct Loads"

3) click "Power Flow -> Covert Loads and Generator"

4)click "Power Flow -> Solution -> TYSL", check in "FACT"

5)open savnw.dyr

6)click "Dynamic -> Simulation -> Perform Simulation(STRT/RUN)"

7)create out file, click "Initiate", set 1s and run

8)Adding fault

---

When I add branch unbalance falut to other bus pair, it can be work;

but Bus-3001 to Bus3003, something wrong, the information in output bar like this:

Channel output file is "C:\Users\Yang\Documents\PTI\PSSE34\EXAMPLE\tt001.outx"

 Using machine R and X' from fault analysis data

 Diagonals = 23   Off-diagonals = 38   Maximum size = 58
 Positive sequence network: Diagonals = 23   Off-diagonals = 38

 Negative sequence network: Diagonals = 23   Off-diagonals = 38

 Diagonals = 23   Off-diagonals = 32   Maximum size = 46
 Bus    101     [NUC-A       21.600] is isolated in the zero sequence network
 Bus    102     [NUC-B       21.600] is isolated in the zero sequence network
 Bus    206     [URBGEN      18.000] is isolated in the zero sequence network
 Bus    211     [HYDRO_G     20.000] is isolated in the zero sequence network
 Bus   3011     [MINE_G      13.800] is isolated in the zero sequence network
 Bus   3018     [CATDOG_G    13.800] is isolated in the zero sequence network
 6 buses are isolated in the zero sequence network
 Zero sequence network: Diagonals = 23   Off-diagonals = 32




Messages for api DIST_SPCB_FAULT_2
 Terminated due to invalid fault specification or application:   (003701)
 Invalid branch circuit "1" from bus 3001 [MINE        230.00] to bus 3003 [S. MINE     230.00]   (003702)
 There is no path to ground at bus 3001 [MINE        230.00]   (003713)


 Output completed
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Why official EXAMPLE not work, how to adding unbalance branch fault correctly?

AlexYang gravatar imageAlexYang ( 2018-04-29 05:39:29 -0500 )edit

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answered 2018-05-15 13:44:05 -0500

EBahr gravatar image

updated 2018-05-15 13:46:38 -0500

For whatever reason, PSSE cannot calculate imbalance without line charging and/or line shunts on the line. Try adding small amounts B and B0 until you don't get the error. Adding 0.01 to charging (B and B0) and 0.001 to Line B To/From I was able to get it to produce some values with SPCB. It's very annoying and potentially not as accurate, but it's about all you can do to make it work.

 ZERO SEQUENCE THEVENIN IMPEDANCE SUBMATRIX:
    BUS    3001 [MINE        230.00]    3003 [S. MINE     230.00]
   3001      (   0.00022,   0.00960)      (   0.00006,   0.00210)
   3003      (   0.00006,   0.00210)      (   0.01334,   0.13911)

 POS. SEQUENCE THEVENIN IMPEDANCE SUBMATRIX:
    BUS    3001 [MINE        230.00]    3003 [S. MINE     230.00]
   3001      (   0.00201,   0.03119)      (   0.00210,   0.00731)
   3003      (   0.00210,   0.00731)      (   0.01003,   0.05125)

 NEG. SEQUENCE THEVENIN IMPEDANCE SUBMATRIX:
    BUS    3001 [MINE        230.00]    3003 [S. MINE     230.00]
   3001      (   0.00201,   0.03119)      (   0.00210,   0.00731)
   3003      (   0.00210,   0.00731)      (   0.01003,   0.05125)

 PI EQUIVALENT Y MATRIX IS:
 (     0.5319,  -131.2263)   (     0.5319,   118.7678)
 (     0.5319,   118.7678)   (     0.5319,  -131.2263)

 TO SIMULATE:

 ONE PHASE GROUNDED WITH IMPEDANCE=      0.0000 +J      0.0000
   50.0 PERCENT OF WAY DOWN LINE FROM   3001 [MINE        230.00]

 FOR BRANCH FROM BUS   3001 [MINE        230.00] TO BUS   3003 [S. MINE     230.00] CIRCUIT 1
  USE EQUIVALENT R+JX= (   -0.00004,    0.00842)  B= 0.0

 AT BUS   3001 [MINE        230.00] USE LINE CONNECTED SHUNT= (    1.06378,  -12.45846)

 AT BUS   3003 [S. MINE     230.00] USE LINE CONNECTED SHUNT= (    1.06378,  -12.45846)

Here is the modified line data:

  3001,  3003,'1 ', 0.00000E+0, 8.00000E-3,   0.01000,    0.00,    0.00,    1.00,  0.00000,  0.00100,  0.00000,  0.00100,0,1,   0.00,  55,1.0000
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I modified the charging (B and B0) and Line B To/From of 3001-3003 as you say, but I still encountered the previous error —— Messages for api DIST_SPCB_FAULT_2. I would like to ask if I need to modify the data of other branches, or is there a problem with my operation steps?

AlexYang gravatar imageAlexYang ( 2018-05-16 01:38:06 -0500 )edit

In my version (33.9) B+ must be larger than 0.01, e.g. 0.0101 for SPCB to work for line 3001 - 3003.

perolofl gravatar imageperolofl ( 2018-05-18 06:29:43 -0500 )edit

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Asked: 2018-04-29 05:38:01 -0500

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Last updated: May 15