Stabilized-voltage power supply for three-phase-voltage ground-insulation resistance detection system

The utility model relates to a stabilized-voltage power supply for a three-phase-voltage ground-insulation resistance detection system, and the power supply comprises a single-phase transformer A, a single-phase transformer B and a single-phase transformer C, which are connected to the three-phase voltage input end of a power supply system and form a three-phase power supply transformer. The primary winding coils L1, L2 and L3 of the three single-phase transformers A, B and C are connected to form a Y-shaped winding coil, wherein the common end of the Y-shaped winding coil is grounded and the other three ends of the Y-shaped winding coil are connected with the three-phase voltage input end. The secondary winding coil output of the three single-phase transformers A, B and C forms duplex winding coils, wherein the first group of coils L11, L21 and L31 are connected to form a y-type winding coil. The common end of the y-shaped winding coil is connected with a control system, and the other three ends of the y-shaped winding coil are connected with a voltage-stabilizing circuit module. The power supply greatly reduces the power failures, caused by electric leakage and misjudgment, of the power supply system, avoids failures to operate because that a human body is shocked electrically, and guarantees the safety of a person.