Technically no. A quick check of wikipedia shows that since Penn St joined in 1993 only Michigan St in 1999 beat all three teams, and they were not the Big 10 champ.
Honerable mention (beat two did not play a third)
95 NW
00 Minn
02 Iowa
03 Iowa
03 Wis
04 Wis
Also the 93 Wis team went 1-0-2
And last years Iowa team went 1-0
