DC grounding fault monitoring device
A fault monitoring, DC grounding technology, applied in the field of power system, can solve problems such as instantaneous ground fault protection malfunction
Inactive Publication Date: 2021-11-16
李佳鹏
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Problems solved by technology
[0005] The purpose of the present invention is: in order to solve the instantaneous ground fault in the DC system is a type of insulation fault that is extremely difficult to find, but the instantaneous ground fault can easily cause protection malfunction, how to detect the instantaneous ground fault in the DC system has always been an insulation fault. A big problem in monitoring, and a DC ground fault monitoring device is proposed
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[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0042] see Figure 1-2 , the present invention provides a technical solution:
[0043] A DC ground fault monitoring device, comprising:
[0044] Main controller, the main controller is fixed on the screen;
[0045] The main controller monitors the system bus-to-ground voltage in real time. When the DC system fails, the system voltage is too high or too low to exceed the preset setting value, or the main controller LCD screen displays an alarm message when the AC ...
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The invention, which belongs to the technical field of the electric power system, discloses a DC grounding fault monitoring device comprising a main controller fixed on a screen body; and the main controller monitors voltage to ground of a system bus in real time, and when a direct current system breaks down, system voltage is too high or too low and exceeds a preset setting value, or alternating current voltage exceeds the preset setting value, a liquid crystal screen of the main controller displays alarm information, and a voltage out-of-limit indicator lamp and a buzzer give an alarm at the same time. According to the invention, the communication between the main controller and the current collector is determined by the unique address code of the sub-machine and is irrelevant to the physical position of the sub-machine, so that high flexibility is brought to the field system configuration, the main controller and the current collector can be hot-plugged in an electrified manner, the main controller can automatically identify the current collector without manual setting, and after the special direct-current leakage current sensor is connected to the current collector through the special interface, the current collector can automatically identify the direct-current leakage current sensor, and manual setting is not needed.
Description
technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a DC ground fault monitoring device. Background technique [0002] The DC system grounding fault in the power system is a kind of fault that is prone to occur and is very harmful to the power system. Whether it is positive grounding or negative grounding, in the case of two-point grounding, it may cause protection malfunction or protection refusal to operate, endangering the normal operation of the primary system. Due to the complexity and dynamics of the DC system, DC grounding faults are often difficult to locate. At the same time, due to the wide application of microcomputer protection and integrated automation systems, higher requirements are put forward for the accuracy and safety of the DC system grounding monitoring device. [0003] According to the different monitoring principles, the DC system grounding monitoring device can be divided into the AC low ...
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IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 李佳鹏刘东亮王坤秦华何宁张伟刘晓彪白易鑫
Owner 李佳鹏