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This paper proposes an agent based distributed power system architecture. With this architecture, agents are used to represent various data sources, condition monitoring and control switchgears of an electricity substation. Particularly, a broker agent as a middle-ware, is designed to bridge the gap between a user and a device in a power system. In addition, the advantages and disadvantages of the implementation of a broker agent in this architecture are discussed after the experiments and evaluations using the remote procedure call (RPC) model. The experimental results indicate when the number of interactions is large or the latency of the network is high, a broker agent method performs better than a client-server method.