Total digitized transformer station closed loop dynamic real-time simulation testing system

The invention relates to a total digitized transformer station closed loop dynamic real-time simulation testing system. The system adopts the structure that a testing system host machine (1) is connected with a PCI bus extender (2) through optical fiber; the PCI bus extender (2) is connected with an IEC61850 communication card (3) through the optical fiber; the IEC61850 communication card (3) is connected with a signal expander (4) through the optical fiber; a network exchanger (5) and an extra-high voltage circuit current differential protection device (9) are connected with the signal expander (4) through the optical fiber; and the network exchanger (5) is respectively connected with a figure fault wave recorder (7), circuit breaker control device intelligent primary equipment (6) and the extra-high voltage circuit current differential protection device (9) through the optical fiber. The system provided by the invention performs real-time simulation testing for closed loop dynamic performance of a total digitized transformer station, can realize network-access technical performance detection for secondary equipment of total digitized protection, reduces grid accident, and ensures safety and steady operation of a grid.