Palmer was given a 20-second post-race penalty for forcing Sam Bird off the road while defending his position late in the race.
The punishment drops Palmer from third to 10th in the results, and elevates Jon Lancaster onto the podium in his GP2 return with new team Hilmer, which also claimed victory with Robin Frijns.
Bird spun into retirement as a result of his clash with Palmer, but also gets a penalty of his own for an earlier collision with polesitter Marcus Ericsson.
The DAMS car sustained suspension damage in the tangle at the chicane.
Bird was given a five-place grid penalty for Sunday's race, which will drop him to the back of the field along with Nathanael Berthon, the other driver penalised.
Berthon was given a 10-place demotion - although he would have only been 25th on the 26-car grid anyway - for crashing into Sergio Canamasas and Tom Dillmann.
The Trident car was launched over the back of the other two on the run to the hairpin, ending Berthon and Canamasas's races, although Dillmann continued to finish sixth on the road.
- Sports & Recreation
- Sam Bird
- Robin Frijns
- Jon Lancaster