Device for monitoring invasion into direct current by alternating current based on ripple analysis

Abstract

The invention relates to a device for monitoring invasion into a direct current by an alternating current based on ripple analysis. The device comprises a casing. A microcontroller is installed in the casing, the output end of the microcontroller is connected with a touch screen and a state indicator lamp, the left side of the microcontroller is connected with a monitoring modulator, and the touch screen is provided with an on-line insulating monitoring display area and a main menu display area. The on-line insulating monitoring display area comprises a busbar voltage value display area, a positive busbar voltage value display area and a negative busbar voltage value display area which are located on the left side of the touch screen, and a positive earth resistance value display area, a negative earth resistance value display area and an alternating current invasion value display area which are located on the right side of the touch screen. The voltage value of the alternating current invading the direct current can be displayed accurately, and when the voltage value of the alternating current invading the direct current is too large, a warning lamp gives a light alarm. The device has the advantages that a function of measurement, recording and warning against faults of invasion into the direct current by the alternating current is added, the positive busbar ground impedance and negative busbar ground impedance are calculated accurately, and the device further has a voltage monitoring function and is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to an AC intrusion DC monitoring device based on ripple analysis. Background technique [0002] With the development of my country's electric power industry, there are many types of power plants and substations, and there are more and more large-capacity power plants and substations. Safe power generation and transmission are related to the entire national economy and people's normal life. DC systems are important for power plants and substations. The safety and reliability of the DC system affects the safe operation of power plants and substations, and is related to the safe production of the entire power grid. In the DC system, the phenomenon of AC intrusion into DC often occurs. It may even cause the primary equipment controlled by DC to malfunction or refuse to operate, seriously endangering the safe and stable operation of the power system. The curren...

AI Technical Summary

Problems solved by technology

[0002] With the development of my country's electric power industry, there are many types of power plants and substations, and there are more and more large-capacity power plants and substations. Safe power generation and transmission are related to the entire national economy and people's normal life. DC systems are important for power plants and substations. The safety and reliability of the DC system affects the safe operation of power plants and substations, and is related to the safe production of the entire power grid. In the DC system, the phenomenon of AC intrusion into DC often occurs. It may even cause the primary equipment controlled by DC to malfunction or refuse to operate, seriously endangering the safe and stable operation of the power system. The current DC monitoring device cannot effectively monitor the AC components invading the DC, so it cannot be detected in time and accurately. The AC component intruding into the DC system often causes the DC system in the power plant and substation to work abnormally, and in serious cases, the substation will stop completely.

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