The integrated line selection technology of industrial computer small current grounding line selection device organically integrates a variety of line selection methods, gives full play to the complementary advantages of various methods, can adapt to the variable multi terminal single-phase grounding fault, and improves the line selection accuracy of small current grounding line selection device.

The real-time fault signal acquisition system of industrial computer small current line selection device has a variety of functional features, including: line selection function, tripping (closing) function, wheel cutting function, post acceleration tripping function, phase judgment function, Pt line breaking judgment function, ferromagnetic resonance alarm function, fault statistics function, operation condition adaptive function, etc. In particular, the wheel cutting function makes up for the deficiency of the line selection function. If the line selection trip fails, the rear wheel cutting function will start. As long as the fault does not disappear, the wheel cutting function of the device will not stop until the fault line is removed to ensure the timely isolation of the fault line.

The small current grounding line selection device of industrial control computer can provide the accident report of electric quantity startup of the device, including the waveforms of one cycle before the fault and five cycles after the fault, and has the statistical function of instantaneous grounding and permanent grounding times of each line, so as to provide the basis for analyzing the operation status of the line.