I need any kind of information related to the connection between insulated cables and overhead lines at =>220 kV. Specially references, reasons of failure, failure statistics, state of the art, new tendecies, materials, ...

I really don't think that you want to go there, mate, if so, why?.
At these sorts of voltages, things get pretty dicey!.

Are you a line worker/trainee?.
If so, give us a yell.

To anyone that is not sure how connections are made at these voltages, mark my words, any small loss in a bad connection normally results in a spectacular failure of the Copper/Aluminium joint.
Normally the Drop-Out fuse (Primary) has a Copper socket on one end and a Aluminium one, on the other.
The majority of these connections are done with a proprietry crimp tool, supplied by the Local Lines Co.
They are also inspected by the Network Operator (Lines Chief), before the system is re-energised.

The only thing I could say is check
the IEEE guidelines and articles
on underground riser to overhead
high voltage lines. They have all
the information,even the drawings.
I know because I work before in a
power company in my country and
we used their bulletin and articles.

Check also companies that supply
the materials for this kind of
connection such as RAYCHEM and 3M.

In my life, I have never know
that there is a termination kit
to do this or insulated cable for 220 KV lines. It is too high and expensive.
It is to high and very expensive
to be insulated.

The only thing I could say is check
the IEEE guidelines and articles
on underground riser to overhead
high voltage lines. They have all
the information,even the drawings.
I know because I work before in a
power company in my country and
we used their bulletin and articles.

Check also companies that supply
the materials for this kind of
connection such as RAYCHEM and 3M.

Although cables up to 1000kV (oil filled) and 500kV (XLPE) have come into use in the past years, HV cables are rare beasts. 220kV is only used in national grids and consequently the only people who will know this field are cable suppliers, national grid operators and the contractors who work for them. I suggest starting with CIGRE, the "International Council on Large Electric Systems". See www.cigre.org and more specifically the catalogue of publications on http://www.cigre.org/GB/BROCHURES/fsbrochures.htm

As you can see by the responses you have recived, this is not something for the untrained. My company actually does this type on installation. Once you get above 115 KV most of the cable comes from BIC and it is a very long and tedious process to terminate this cable as it is oil filled. You might want to go to thier website for your info