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# A tree search in Mathcad

## A tree search in Mathcad

(OP)
I'm looking for a method of examining the nodes in an electric circuit and modifying some parameters associated with nodes which meet certain criteria.  Can anyone help?  I will have to do it via a little program obviously.  (I use Mathcad 2000 Professional).

The specific problem I have is to modify the voltage vector on all nodes "downstream" of a delta-star transformer, but only as far as the next transformer.  Any nodes beyond the next transformer will need the same treatment, but with that transformer's phase shift added.

Bung

### RE: A tree search in Mathcad

It seems to me that a look in any elementary texts on data structures would find your answer, e.g. linked lists, btree etcs.  but MathCad is not reaaly built to handle this sort of data analysis - but I may be wrong so try the MatchCad collaboratory

### RE: A tree search in Mathcad

Hi Bung,

Please present a short sample to understand better your question and perhaps I could help.

### RE: A tree search in Mathcad

(OP)
cuky2000 - let's say I have a circuit in which the nodes are numbered uniquely.  Transformers connect two nodes, and separate the network into areas with at a common voltage level.  A transformer shifts the voltage phase by some multiple of 30deg (three phase system).  I need to be able to track which nodes are connected to each other and are not separated by a transformer, so that I can apply the correct phase shift.

Example: nodes 1&2 are connected by a transformer.  Node 2 and all other nodes connected to it by any circuit element except a transformer have their voltage phasor shifted by lets say 30 degrees.  Let's say nodes 3,5, 8 and 9, are all connected to node 2, but there is another transformer on  node 8 to node 10 with a phase shift of 30deg.  If nodes 2,4 and 6 are connected to node 10, then a further phase shift of -30deg is required.

I have three groups of nodes in this example:

group 1, consisting of node 1, phase shift 0deg.
group 2, nodes 2,3,5,8,9 phase shift 30deg
group 3, nodes 10, 2, 4, 6 phase shift =group 2 +30deg (or total relative to group 1 60deg)

I need some way of Mathcad tracking which node belongs in which group so that it can apply the phase shift properly.  (Beware - there is a bug in the Electrical Power Systems Engineering Handbook pack from Mathcad, in the Faults Applications section - it only gets the phase shift right on the node the transformer is connected to and downstream from there. I am basically modifying and extending this to assist in semi-automating protection relay settings).

thanks

Bung
Life is non-linear...

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