Intelligent detector for direct-current power supply system of transformer substation

Abstract

The invention discloses an intelligent detector for a direct-current power supply system of a transformer substation. The intelligent detector comprises a high-frequency rectifying circuit (1) respectively connected with a high-frequency rectifying circuit direct-current output terminal (2), a polarity detection circuit (3), a ring network and a parasitic detection circuit (4), and the direct-current output terminal (2) is respectively connected with the polarity detection circuit (3), the ring network and the parasitic detection circuit (4). The intelligent detector is safe and rapid and accurate in judgment, and operation of the direct-current system is facilitated and simplified.

Description

Technical field: [0001] The invention relates to an intelligent detection device for a DC power supply system of a substation, belonging to the technical field of substation inspection and maintenance of electric power systems. Background technique: [0002] At present, the computer-based insulation monitoring device installed in the DC system of the substation is to install a sensor in each DC feeder circuit to detect the leakage current and calculate the grounding resistance, so as to judge the insulation status of the DC positive and negative bus bars. On-duty device alarms. However, there are two situations in the use of the microcomputer insulation monitoring device: 1) the judgment is accurate when the DC system with radial power supply is grounded, and the line selection is generally inaccurate for the DC system with ring network power supply or parasitic loop; 2) The insulation monitoring device has been in operation for a long time. Due to the aging of components, ...

AI Technical Summary

Problems solved by technology

However, there are two situations in the use of the microcomputer insulation monitoring device: 1) the judgment is accurate when the DC system with radial power supply is grounded, and the line selection is generally inaccurate for the DC system with ring network power supply or parasitic loop; 2) The insulation monitoring device has been in operation for a long time. Due to the aging of components, there are often false alarms and missing alarms, and it is difficult to accurately locate the fault after a ground fault alarm occurs.

Images