Relay protection synchronization performance testing system and method based on random discrete time domain

The invention discloses a relay protection synchronization performance testing system based on random discrete time domain. The relay protection synchronization performance testing system comprises an upper computer and a testing host, wherein the testing host comprises a CPU (Central Processing Unit), a data generating module and a plurality of random data sending modules, wherein the upper computer, the CPU and the data generating module are sequentially connected, the data generating module is connected with the random data sending modules, the random sending modules are connected with measured interval-crossing protection equipment, the data generating module comprises a first crystal oscillator, an FPGA (Field Programmable Gate Array) and a multichannel data sending module, the first crystal oscillator, the FPGA and the multichannel data sending unit are sequentially connected, and the random data sending modules comprise data sending units, receiving units and second crystal oscillators. According to the relay protection synchronization performance testing system disclosed by the invention, randomness and discreteness on an output time domain of a merging unit are actually realized by adopting a multi-crystal oscillator system, and the multi-crystal oscillator system comprises crystal oscillators of the data generating module and crystal oscillators of the random data sending modules.