Abstract: Non-electricity protection is of great significance for the stable operation of power systems. taking gas protection as an example, the working principles of equipment circuits such as gas relays, direct tripping circuits, and input acquisition circuits are introduced. On this basis, in response to a non-electricity protection accident caused by an earthquake, according to on-site records and industry standards for direct tripping non-electricity protection, some improvement measures were analyzed from three aspects: gas relay, direct tripping circuit, and input acquisition. These measures include improving the seismic resistance of the main transformer and gas relay, improving the reliability of the direct tripping circuit in terms of action power, action delay, and action voltage, accelerating the recognition speed of input acquisition. These improvements are beneficial for enhancing the information recording ability of the protection device and improving the reliability of non-electrical direct tripping protection.