BRASILIA, Aug 30 (Reuters) - Brazil’s central government reported a primary budget deficit of 19.8 billion reais ($3.8 billion) in July, the Treasury said on Monday, more than the 17.3 billion reais deficit forecast in a Reuters poll of economists. $1 = 5.1868 reais Reporting by Marcela Ayres Editing by Chris Reese Our Standards: The Thomson Reuters Trust Principles.