When a communication link and a transmission line fail simultaneously， in order to that the wide area backup protection system（WABPS） can act quickly and reliably through ensuring real-time capability and reliability of information transmission， the communication mode based on stream control transmission protocol（SCTP） is proposed. The measure to improve real-time capability and the improved path switching method based on multi-homing for SCTP are proposed， and applied to information transmission of a WABPS. The communication network and SCTP， WABPS agents and the power grid modeling are implemented on electric power and communication synchronizing simulator（EPOCHS） platform. The effectiveness of the proposed communication mode used in WABPS information transmission is verified by simulations.