Could you tell us the version of minecraft you are using? Because thermal expansion has changed a little between versions. If you are using 1.6 if I recall correctly
tesseracts only take RF so if you have any type of universal cables I suggest you connect those to the tesseract or make a system that can convert EU to RF. Secondly try using liquiducts instead of buildcraft pipes since the tesseract and the liquiduct are in the same mod.
If you have any more questions about or like this I would suggest going here:
http://forum.feed-the-beast.com/threads/ask-a-simple-question-get-a-simple-answer.9625/