Novel interval layer net networking method for subway pressing ring net protecting system

The invention discloses a novel interval layer net networking method for a subway pressing ring net protecting system. The method comprises the steps that in a numerical protecting system of a pressing ring net in a subway power supply system, protecting devices in transformer stations and between the transformer stations are communicated through an interval layer GOOSE network, the information of protecting starting, the information of protecting actions and the information of protecting switch positions are exchanged mutually, the situations of the protecting actions of a higher-grade switch and a lower-grade switch are monitored, and then the quick positioning and the quick resecting of ring net buses and cable faults are logically judged. In the method, a VLAN overlap mode is used, each transformer station is distributed with the only VLAN ID, and at the same time, the transformer station can realize communication with the adjacent transformer stations in front and behind, so that a GOOSE message is transmitted in a directional and limited area in the network, the transmission range of broadcast packets can be effectively limited, the efficiency of the network is improved, and the system stability and the safety are improved.