CT

23:20 Aug 5, 2010 

Yes, this is very clearly what they mean; however, "transformer center" won't work, neither I think will "substation". All these are service transformers, I understand -- the ones that transform down to the building mains voltage (380/220V) . We don't regard them as "centers"; normally, if a transformer is located within a building, its location is called a transformer room. It may be called a substation if it is housed in an isolated building; here's a funny instance of that: http://en.wikipedia.org/wiki/File:SubstationHouseScarborough...

Here's a crude hirerachy of power distribution (note that in America, most service transformers hang on the poles, but if they are located inside buildings, there is usually a separate room to house them): http://2.ly/share/chsu

11:03 Aug 5, 2010 

CT is normally in English Current Transformer - but in this case it is most probably "Centros de Transformación"