I would do a WFS attribute based query on the pole no. and use the returned GML to construct an extent bounds object, then do zoomToExtent.

Something like:
        var fts = request.features;
        if (fts.length>0 && fts[0].geometry) {
            sExt = fts[0].geometry.getBounds().clone();
            for(var i=1;i<fts.length;i++) {
                sExt.extend(fts[i].geometry.getBounds());
            }
        }


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