Small-resistance grounding equipment and device

The utility model discloses a small-resistance grounding device, which is characterized by comprising a second current transformer, a grounding transformer, a single-stage isolating switch, a resistor, a first current transformer and a controller, the second current transformer is grounded after passing through the grounding transformer, the single-stage isolation switch, the resistor and the first current transformer, and the controller is connected with the first current transformer. According to the invention, the grounding fault current is in a resistance-capacitance property, the phase difference angle between the grounding fault current and the voltage is reduced, and the damage of sudden short circuit, intermittent arc grounding overvoltage, system operation overvoltage and system resonance overvoltage to electrical equipment can be effectively limited; and meanwhile, single-phase earth fault protection is convenient to configure, and a fault line can be effectively cut off within proper time, so that