>> still it is not working i'm using excel 5 writer
Sheet protection options have not yet been implemented for Excel5 reader/writer. Work item created. Will put it on the to-do list for next week.
>> one more question how to set width of image?
It should be working. But if you are trying to set non-proportional width/height you need to use
$worksheet = $excel->getActiveSheet();
$objDrawing = new PHPExcel_Worksheet_Drawing();