A direct current bus fault recording system
Patent Information
- Application Number
- CN202521798101.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-22
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-08-22
AI Technical Summary
[0003]然而，上述故障录波器仅检测直流母线的直流信号，当直流母线中串入交流信号时，上述故障录波器无法检测到交流信号，也就无法及时排除由于直流母线中串入交流导致的异常事故
[0025]本实用新型实施例提供的流母线故障录波系统包括：录波设备和直流母线；所述直流母线包括正极母线和负极母线；所述录波设备包括信号放大单元、滤波单元、交直流采样单元、信号处理单元、显示单元、第一空气开关和第二空气开关；所述正极母线通过所述第一空气开关与所述信号放大单元的第一输入端连接，所述负极母线通过所述第二空气开关与所述信号放大单元的第二输入端连接；所述信号放大单元、所述滤波单元、所述交直流采样单元、所述信号处理单元和所述显示单元依次串接。通过设置交直流采样单元，其支持直流信号及交流信号同步采集。当直流母线中串入交流信号时，通过交直流采样单元对交流信号进行采样，之后信号处理单元对交流信号进行处理后，可通过显示单元对交流信号进行显示，以便于第一时间内发现交流信号，有助于及时排查引起直流母线中串入交流的原因，以避免由于直流母线中串入交流导致异常事故的进一步扩大。
Smart Images
Figure CN224840387U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of DC bus technology, and in particular to a DC bus fault recording system. Background Technology
[0002] In related technologies, by setting up a fault recorder to visually view the AC voltage of the DC bus, it is possible to detect bus voltage fluctuations or abnormalities in a timely manner and take corresponding measures to avoid the escalation of accidents due to untimely detection of abnormalities.
[0003] However, the aforementioned fault recorder only detects the DC signal of the DC bus. When an AC signal is introduced into the DC bus, the fault recorder cannot detect the AC signal and therefore cannot promptly eliminate abnormal accidents caused by AC interference in the DC bus. Utility Model Content
[0004] To address the aforementioned technical problems, this utility model provides a DC bus fault recording system, which helps to promptly identify the causes of AC interference in the DC bus and prevent further escalation of abnormal accidents due to AC interference in the DC bus.
[0005] This utility model provides a DC bus fault recording system, including:
[0006] The waveform recording equipment and the DC bus; the DC bus includes a positive bus and a negative bus;
[0007] The waveform recording device includes a signal amplification unit, a filtering unit, an AC / DC sampling unit, a signal processing unit, a display unit, a first air switch, and a second air switch;
[0008] The positive bus is connected to the first input terminal of the signal amplification unit through the first air switch, and the negative bus is connected to the second input terminal of the signal amplification unit through the second air switch;
[0009] The signal amplification unit, the filtering unit, the AC / DC sampling unit, the signal processing unit, and the display unit are connected in series.
[0010] In some embodiments, the AC / DC sampling unit includes an AC sampling board and a DC sampling board;
[0011] The input terminals of both the AC sampling board and the DC sampling board are connected to the output terminal of the filtering unit, and the output terminals of both the AC sampling board and the DC sampling board are connected to the signal processing unit.
[0012] In some embodiments, the signal processing unit includes a waveform plotting element;
[0013] The waveform drawing element is connected to the AC / DC sampling unit and the display unit, respectively.
[0014] In some embodiments, the DC bus fault recording system further includes:
[0015] First switch and second switch;
[0016] The first switch is disposed between the positive bus and the first air switch, and the second switch is disposed between the negative bus and the second air switch.
[0017] In some embodiments, the DC bus fault recording system further includes:
[0018] A power supply device, wherein the first end of the power supply device is connected to the positive busbar and the second end of the power supply device is connected to the negative busbar.
[0019] In some embodiments, the DC bus fault recording system further includes:
[0020] An energy storage device, wherein a first end of the energy storage device is connected to the positive busbar and a second end of the energy storage device is connected to the negative busbar.
[0021] In some embodiments, a discharge circuit is provided on the connection line between the first end of the energy storage device and the positive bus.
[0022] In some embodiments, the DC bus fault recording system further includes:
[0023] An insulation testing device is provided, wherein the first end of the insulation testing device is connected to the positive busbar, and the second end of the insulation testing device is connected to the negative busbar.
[0024] The technical solution provided by this utility model has the following advantages compared with the prior art:
[0025] The DC bus fault recording system provided in this embodiment includes: a recording device and a DC bus; the DC bus includes a positive bus and a negative bus; the recording device includes a signal amplification unit, a filtering unit, an AC / DC sampling unit, a signal processing unit, a display unit, a first air switch, and a second air switch; the positive bus is connected to the first input terminal of the signal amplification unit through the first air switch, and the negative bus is connected to the second input terminal of the signal amplification unit through the second air switch; the signal amplification unit, the filtering unit, the AC / DC sampling unit, the signal processing unit, and the display unit are connected in series. By setting the AC / DC sampling unit, it supports the synchronous acquisition of DC and AC signals. When an AC signal is introduced into the DC bus, the AC / DC sampling unit samples the AC signal, and after the signal processing unit processes the AC signal, the display unit can display the AC signal, so as to detect the AC signal in the first time and help to promptly investigate the cause of the AC signal introduced into the DC bus, so as to avoid further expansion of the abnormal accident due to the AC signal introduced into the DC bus. Attached Figure Description
[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A schematic diagram of a DC bus fault recording system provided in this embodiment of the present invention;
[0029] Figure 2 A schematic diagram of another DC bus fault recording system provided in this embodiment of the present invention.
[0030] Explanation of reference numerals in the attached diagram: 10. Waveform recording device; 11. DC bus; KM+, positive bus; KM-, negative bus; 12. Signal amplification unit; 13. Filtering unit; 14. AC / DC sampling unit; 141. AC sampling board; 142. DC sampling board; 15. Signal processing unit; 151. Waveform drawing element; 16. Display unit; 17. First air switch; 18. Second air switch; S1. First switch; S2. Second switch; 19. Power supply device; 20. Energy storage device; 21. Discharge circuit; 22. Insulation detection device. Detailed Implementation
[0031] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.
[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.
[0033] The DC bus fault recording system provided in this embodiment includes: a recording device and a DC bus; the DC bus includes a positive bus and a negative bus; the recording device includes a signal amplification unit, a filtering unit, an AC / DC sampling unit, a signal processing unit, a display unit, a first air switch, and a second air switch; the positive bus is connected to the first input terminal of the signal amplification unit through the first air switch, and the negative bus is connected to the second input terminal of the signal amplification unit through the second air switch; the signal amplification unit, the filtering unit, the AC / DC sampling unit, the signal processing unit, and the display unit are connected in series. By setting the AC / DC sampling unit, it supports the synchronous acquisition of DC and AC signals. When an AC signal is introduced into the DC bus, the AC / DC sampling unit samples the AC signal, and after the signal processing unit processes the AC signal, the AC signal can be displayed through the display unit, so as to detect the AC signal in the first time and help to promptly investigate the cause of the AC signal introduced into the DC bus, so as to avoid further expansion of the abnormal accident due to the introduction of AC signal into the DC bus.
[0034] The DC bus fault recording system provided in the embodiments of this utility model will be described exemplarily below with reference to the accompanying drawings.
[0035] Figure 1 This is a schematic diagram of a DC bus fault recording system provided as an embodiment of the present invention. Figure 1As shown, the DC bus fault recording system includes: a recording device 10 and a DC bus 11; the DC bus 11 includes a positive bus KM+ and a negative bus KM-; the recording device 10 includes a signal amplification unit 12, a filtering unit 13, an AC / DC sampling unit 14, a signal processing unit 15, a display unit 16, a first air switch 17, and a second air switch 18; the positive bus KM+ is connected to the first input terminal A1 of the signal amplification unit 12 through the first air switch 17, and the negative bus KM- is connected to the second input terminal A2 of the signal amplification unit 12 through the second air switch 18; the signal amplification unit 12, the filtering unit 13, the AC / DC sampling unit 14, the signal processing unit 15, and the display unit 16 are connected in series.
[0036] Specifically, the DC bus 11 fault recording system implemented in this utility model includes an AC / DC sampling unit 14, which supports the synchronous acquisition of DC and AC signals. When an AC signal is introduced into the DC bus 11, the AC / DC sampling unit 14 samples the AC signal, and then the signal processing unit 15 processes the AC signal. The AC signal can then be displayed through the display unit 16, so as to detect the AC signal in the first instance and help to promptly investigate the cause of the AC signal entering the DC bus 11, thereby preventing the further escalation of abnormal accidents caused by the AC signal entering the DC bus 11.
[0037] In addition, this utility model can also monitor the DC signal of the DC bus 11, and can detect fluctuations or abnormalities in the DC voltage of the DC bus 11 in the first instance, and take corresponding measures to avoid the expansion of accidents caused by untimely detection of abnormalities, thereby improving the stability of circuit operation.
[0038] The DC bus fault recording system provided in this embodiment includes: a recording device and a DC bus; the DC bus includes a positive bus and a negative bus; the recording device includes a signal amplification unit, a filtering unit, an AC / DC sampling unit, a signal processing unit, a display unit, a first air switch, and a second air switch; the positive bus is connected to the first input terminal of the signal amplification unit through the first air switch, and the negative bus is connected to the second input terminal of the signal amplification unit through the second air switch; the signal amplification unit, the filtering unit, the AC / DC sampling unit, the signal processing unit, and the display unit are connected in series. By setting the AC / DC sampling unit, it supports the synchronous acquisition of DC and AC signals. When an AC signal is introduced into the DC bus, the AC / DC sampling unit samples the AC signal, and after the signal processing unit processes the AC signal, the AC signal can be displayed through the display unit, so as to detect the AC signal in the first time and help to promptly investigate the cause of the AC signal introduced into the DC bus, so as to avoid further expansion of the abnormal accident due to the introduction of AC signal into the DC bus.
[0039] In some embodiments, Figure 2 A schematic diagram of another DC bus fault recording system provided as an embodiment of this utility model. (See diagram below.) Figure 2 As shown, the AC / DC sampling unit 14 includes an AC sampling board 141 and a DC sampling board 142;
[0040] The input terminals of the AC sampling board 141 and the DC sampling board 142 are both connected to the output terminal of the filtering unit 13, and the output terminals of the AC sampling board 141 and the DC sampling board 142 are both connected to the signal processing unit 15.
[0041] Specifically, by setting up the AC sampling board 141, when an AC signal is input into the DC bus 11, the AC signal can be sampled and the detected electrical signal can be converted into a digital signal and transmitted to the signal processing unit 15; by setting up the DC sampling board 142, the DC signal in the DC bus 11 can be sampled and the detected electrical signal can be converted into a digital signal and transmitted to the signal processing unit 15.
[0042] In some embodiments, such as Figure 2 As shown, the signal processing unit 15 includes a waveform plotting element 151.
[0043] The waveform drawing element 151 is connected to the display unit 16 and the AC / DC sampling unit 14, respectively.
[0044] Specifically, in conjunction with the aforementioned embodiments, the AC sampling board 141 samples the AC signal input into the DC bus 11, converts the detected electrical signal into a digital signal, and transmits it to the signal processing unit 15. Correspondingly, the waveform drawing element 151 in the signal processing unit 15 draws the AC waveform. Similarly, the DC sampling board 142 samples the DC signal input into the DC bus 11, converts the detected electrical signal into a digital signal, and transmits it to the signal processing unit 15. Correspondingly, the waveform drawing element 151 in the signal processing unit 15 draws the DC waveform. The aforementioned DC and AC waveforms can be visualized through the display unit 16 for intuitive acquisition.
[0045] In some embodiments, such as Figure 1 or Figure 2 As shown, the DC bus fault recording system also includes:
[0046] First switch S1 and second switch S2;
[0047] The first switch S1 is disposed between the positive bus KM+ and the first air switch 17, and the second switch S2 is disposed between the negative bus KM- and the second air switch 18.
[0048] Specifically, the first switch S1 is used to control the circuit continuity between the positive bus KM+ and the first air switch 17, and the second switch S2 is used to control the circuit continuity between the negative bus KM- and the second air switch 18. When the waveform recording device 10 needs to sample the DC bus 11, the first switch S1 and the second switch S2 can be controlled to be in the closed state; when the waveform recording device 10 stops sampling the DC bus 11, the first switch S1 and the second switch S2 can be controlled to be in the open state.
[0049] In some embodiments, such as Figure 1 or Figure 2 As shown, the DC bus fault recording system also includes:
[0050] The power supply device 19 has its first end connected to the positive bus KM+ and its second end connected to the negative bus KM-. Thus, the power supply device 19 can supply power to the DC bus 11.
[0051] In some embodiments, such as Figure 1 or Figure 2 As shown, the DC bus 11 fault recording system also includes:
[0052] Energy storage device 20, the first end of which is connected to the positive bus KM+, and the second end of which is connected to the negative bus KM-.
[0053] Specifically, by setting up an energy storage device 20, when the power supply device 19 supplies power to the DC bus 11, the excess electrical energy of the DC bus 11 can be stored by the energy storage device 20, and the stored energy storage device 20 can be used as a backup power source.
[0054] In some embodiments, such as Figure 1 or Figure 2 As shown, a discharge circuit 21 is provided on the connection line between the first end of the energy storage device 20 and the positive bus KM+. Specifically, when the DC bus 11 and the load connected to the DC bus 11 are inspected or components are replaced, residual capacitive charge (such as filter capacitors, cable distributed capacitance) may remain in the bus or load. If there is direct contact, the residual electrical energy may cause electric shock risk. The discharge circuit 21 can actively release this residual electrical energy to ensure the safety of maintenance personnel and equipment.
[0055] In some embodiments, such as Figure 1 or Figure 2 As shown, the DC bus fault recording system further includes an insulation detection device 22. The first end of the insulation detection device 22 is connected to the positive bus KM+, and the second end of the insulation detection device 22 is connected to the negative bus KM-. Specifically, by setting up the insulation detection device 22, the insulation status of the positive bus KM+ and the negative bus KM- to ground is monitored in real time.
[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0057] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the utility model herein.
Claims
1. A DC bus fault recording system, characterized in that, include: The waveform recording equipment and the DC bus; the DC bus includes a positive bus and a negative bus; The waveform recording device includes a signal amplification unit, a filtering unit, an AC / DC sampling unit, a signal processing unit, a display unit, a first air switch, and a second air switch; The positive bus is connected to the first input terminal of the signal amplification unit through the first air switch, and the negative bus is connected to the second input terminal of the signal amplification unit through the second air switch; The signal amplification unit, the filtering unit, the AC / DC sampling unit, the signal processing unit, and the display unit are connected in series.
2. The DC bus fault recording system according to claim 1, characterized in that, The AC / DC sampling unit includes an AC sampling board and a DC sampling board; The input terminals of both the AC sampling board and the DC sampling board are connected to the output terminal of the filtering unit, and the output terminals of both the AC sampling board and the DC sampling board are connected to the signal processing unit.
3. The DC bus fault recording system according to claim 1, characterized in that, The signal processing unit includes waveform drawing elements; The waveform drawing element is connected to the AC / DC sampling unit and the display unit, respectively.
4. The DC bus fault recording system according to claim 1, characterized in that, Also includes: First switch and second switch; The first switch is disposed between the positive bus and the first air switch, and the second switch is disposed between the negative bus and the second air switch.
5. The DC bus fault recording system according to claim 1, characterized in that, Also includes: A power supply device, wherein the first end of the power supply device is connected to the positive busbar and the second end of the power supply device is connected to the negative busbar.
6. The DC bus fault recording system according to claim 1, characterized in that, Also includes: An energy storage device, wherein a first end of the energy storage device is connected to the positive busbar and a second end of the energy storage device is connected to the negative busbar.
7. The DC bus fault recording system according to claim 6, characterized in that, A discharge circuit is provided on the connection line between the first end of the energy storage device and the positive bus.
8. The DC bus fault recording system according to claim 1, characterized in that, Also includes: An insulation testing device, wherein the first end of the insulation testing device is connected to the positive busbar, and the second end of the insulation testing device is connected to the negative busbar.