Fault monitoring device, power supply state monitoring method and DC test power supply

Abstract

The invention relates to a fault monitoring device, a power supply state monitoring method and a DC test power supply. The fault monitoring device comprises a power supply module which provides a DC power supply for debugging a to-be-accessed device of a transformer substation DC system, wherein the input end of the power supply module is connected with a transformer substation AC system, and the output end of the power supply module outputs the DC power supply; and a monitoring module which is used for monitoring a grounding fault of the to-be-accessed device, and is connected with the power supply module, wherein the grounding fault comprises an AC-DC crosstalk fault; the monitoring module comprises a sampling module and a control module which are connected; the sampling module collects the data of the power supply module and sends the obtained collected data to a control module; the control module processes the collected data, obtains a fault monitoring result, and gives an alarm for an AC / DC electric crossing fault. According to the invention, the safety state of the to-be-accessed device can be monitored, the grounding fault, especially the hidden danger of the alternating current and direct current crosstalk fault, occurring when the device is accessed is eliminated, the safety is improved, the device is simplified, and the efficiency is improved.

Description

technical field [0001] The application relates to the technical field of electric equipment, in particular to a fault monitoring device, a power supply state monitoring method and a DC test power supply. Background technique [0002] In order to protect the reliability of the DC system, the newly connected equipment is usually debugged with an external DC test power supply, and only after confirming that the equipment is fully functional and safe and reliable can it be connected to the DC system for operation. [0003] Before connecting to the DC system, faults such as DC grounding and AC / DC series current may not affect the operation of the equipment, and the equipment operates normally during commissioning. When the equipment with these faults is connected to the DC system, it may affect the normal operation of the DC system and cause the device to alarm; or interact with the distributed capacitance of the DC system, especially the equipment connected to the AC and DC circ...

AI Technical Summary

Problems solved by technology

When the equipment with these faults is connected to the DC system, it may affect the normal operation of the DC system, causing the device to alarm; or interact with the distributed capacitance of the DC system, especially the equipment connected to the AC and DC circuits. In severe cases, It will lead to serious consequences such as tripping of operating equipment, protection malfunction or refusal to operate, and even cause chain reactions leading to serious accidents such as large-scale power outages

[0004] In the process of implementation, the inventor found that there are at least the following problems in the traditional technology: the current DC test power supply cannot guarantee the safety of new equipment connected to the DC system

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