Alternating current entering alarming device of transformer substation direct current power source system

Abstract

The invention discloses an alternating current entering alarming device of a transformer substation direct current power source system. The alternating current entering alarming device of the transformer substation direct current power source system comprises a sampling isolating circuit, a signal amplifier, an analog-digital converter, a real-time monitoring processor, a data storage device, a master control module and an alarming module, wherein the output end of the sampling isolating circuit sequentially passes through the signal amplifier and the analog-digital converter and is further connected with the input end of the real-time monitoring processor, the real-time monitoring processor is connected with the master control module and the data storage device, and the output end of the master control module is connected with the input end of the alarming module. The alternating current entering alarming device of the transformer substation direct current power source system can monitor an alternating current entering direct current power source system in real time, give an alarm in time and carry out route selection on branches with alternating current entering when alternating current with the amplitude ranging from 10V to 250V enters the direct current power source system and largely facilitate checking of grounding failures for workers, thereby improving stability and reliability of the direct current power source system. The alternating current entering alarming device of the transformer substation direct current power source system can be widely applied to the field of power monitoring.

Description

technical field [0001] The invention relates to a charger, in particular to an AC intrusion alarm device for a substation DC power supply system. Background technique [0002] The DC power supply system is a system that provides power supply for the protection. Its stability and reliability directly affect the working conditions of the protection. The factors that lead to the stability and reliability of the DC power system, among which the intrusion of AC into the DC system is one of the main faults that affect the characteristics of the system. It can directly lead to protection malfunction, resulting in serious system failure. [0003] At present, there are no products in China that specifically solve this problem, but some products only have one of the functions. Most of the DC system insulation monitoring devices do not have the detection function of AC intrusion; a small number of DC system insulation monitoring devices Although it has the functions of alarm and line...

AI Technical Summary

Problems solved by technology

It can directly lead to protection malfunction, resulting in serious system failure

[0003] At present, there are no products in China that specifically solve this problem, but some products only have one of the functions. Most of the DC system insulation monitoring devices do not have the detection function of AC intrusion; a small number of DC system insulation monitoring devices Although it has the functions of alarm and line selection for AC intrusion, the premise is that the fault of AC intrusion exists for a long time, and the alarm cannot be issued within 0.5 seconds, and the AC waveform recording cannot be performed, and the instantaneous AC intrusion cannot be detected. DC system alarm

Moreover, the current devices generally lack an isolation circuit for sampling signals, which causes the DC component to affect the sampling, making the device's judgment accuracy low, and cannot effectively protect the DC system under test, posing safety hazards

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