Detection apparatus of multi-point grounding of voltage transformer of power system

The utility model relates to a detection apparatus of multi-point grounding of a voltage transformer of a power system. The detection apparatus comprises a CPU master control circuit, an analog-to-digital conversion circuit and a switch control circuit. A connecting wire of a voltage transformer secondary neutral line N600 and a grounding point is arranged in an opening current transformer; and the output of the opening current transformer passes through a first filtering amplification circuit and is transmitted to the analog-to-digital conversion circuit. A connecting wire between the grounding point and one end of a sampling resistor Rv is arranged in a current transformer; and the output of the current transformer passes through a second filtering amplification circuit and then is transmitted to the analog-to-digital conversion circuit. The other end of the sampling resistor Rv is connected with a plurality of branch circuits; and switches, resistors and A-phase wiring terminals correspondingly and externally connected to current transformers for power are connected in series at the branch circuits. Voltage signals of the two ends of the sampling resistor Rv pass through an isolation amplification circuit and then 0-5-V voltage signals are outputted to the analog-to-digital conversion circuit. With the detection apparatus, whether multi-point grounding faults occur at the multiple voltage transformers can be detected timely and accurately; and concrete localization can be realized.