Vector groups and two_winding_chng_4

transformer
psspy
status
API
python
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I've got a bit of a head scratcher going on. Basically I want to turn a change some transformer's statuses to 0, which I've attempted to do with the following code:

psspy.two_winding_chng_4(i = bus1, j = bus2, ckt = circuitID, intgar1 = 0)

This code is looped many times for many transformers, and when run, the code gives this error (or similar):

Messages for api TWO_WINDING_CHNG_4
Messages for two-winding transformer circuit "1" from <removed> to <removed>:   (002015)
Error: Vector group "Dyn1" not found; set to "Dyn1"   (002073)

Could anyone tell me why I'm getting this error, or maybe a different way of changing the status of a transformer?

Thanks!

acd1

asked 2015-08-03 14:07:29 -0500, updated 2015-08-04 12:52:12 -0500

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I have found a nice solution to the problem. I can use the "aTrnChar" function of the API to return a list of vector groups for a subsystem. I just initialized a two-bus subsystem and found the vector group (and name) of the transformer contained inside it:

psspy.bsysinit(9)
psspy.bsyso(9,bus1)
psspy.bsyso(9,bus2)

ierr, xfmrData = psspy.atrnchar(9,1,3,2,1,['XFRNAME','VECTORGROUP'])
xfmrName = xfmrData[0][0]
vectorGroup = xfmrData[1][0]

psspy.two_winding_chng_4(i=bus1,j=bus2,
                         ckt=circuitID,intgar1 = 0,
                         charar1 = xfmrName, charar2 = vectorGroup)

I think it's a bit silly that I have to create a subsystem just to find the vector group of a transformer, but that's Siemens for you!

@jconto

I appreciate your answer. However, I now see that I didn't make it clear that this code is a part of a loop that runs many times, and doesn't just affect a single transformer. The error above is a sample of a bunch of similar errors.

Therefore the code generated from the recording function doesn't help much.

acd1

answered 2015-08-04 08:40:06 -0500, updated 2015-08-04 17:02:08 -0500

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Use the recording function. Open PSSe, load your case with the target transformer online. Now click on the recording button to save the 'turn off a transformer' activity to a python script. On the two-winding transformer tab, select the target transformer, and set its status to off (=0). Click on the stop button to finish recording. Now you can run the saved script again on the original case to verify it works properly.

2.9k

jconto

answered 2015-08-03 21:58:44 -0500

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Vector groups and two_winding_chng_4 edit

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