A small current grounding line selection device with ground fault early warning
By introducing acquisition and early warning components into the low-current ground fault location device, ground fault early warning and accurate capture of transient signals are achieved, solving the problem of lack of early warning before faults in existing devices and improving the device's adaptability to intermittent ground faults and the accuracy of fault judgment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BAODING SIMAIER ELECTRIC CO LTD
- Filing Date
- 2025-05-24
- Publication Date
- 2026-05-29
AI Technical Summary
Existing low-current grounding fault location devices lack grounding fault early warning functions and the ability to accurately capture transient signals, resulting in a lack of effective early warning mechanisms before faults occur. They are poorly adaptable to intermittent grounding faults and find it difficult to accurately capture fault information and make correct fault location judgments in a short period of time.
The system employs acquisition and early warning components, including a current sampling board, a voltage sampling board, an inductor, a transistor, an analog-to-digital converter, and a processor. By acquiring zero-sequence current and zero-sequence voltage signals, it achieves ground fault early warning and accurate capture of transient signals. Fault judgment is then performed by combining wavelet transform and intelligent algorithms.
It enables maintenance personnel to be alerted to potential grounding faults before they occur, improves adaptability to intermittent grounding faults, and can accurately capture fault information and make correct line selection judgments in a short time.
Smart Images
Figure CN224303830U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment technology, specifically a low-current grounding fault location device with grounding fault early warning. Background Technology
[0002] Electricity is a vital energy source in modern society, and the stable operation of the power system is crucial for ensuring the normal development of the social economy and the normal order of people's lives. Low-current grounding systems are widely used in medium and low-voltage distribution networks. However, if single-phase grounding faults are not detected and eliminated in a timely and accurate manner, they may develop into more serious faults such as phase-to-phase short circuits, leading to power outages and causing significant impacts on social production and daily life.
[0003] Society has increasingly higher requirements for power supply quality and safety. This not only demands a continuous and stable power supply from the power system, but also requires minimizing the impact on users and ensuring the safety of personnel and equipment during fault occurrences. The accurate operation of low-current grounding fault location devices helps to promptly eliminate grounding faults, preventing them from escalating and damaging equipment. It also helps prevent safety accidents such as electric shocks caused by grounding faults, aligning with society's focus on power supply quality and safety.
[0004] Existing shortcomings: Most existing low-current ground fault location devices focus on fault location after a fault occurs, but lack an effective early warning mechanism before a fault occurs. They cannot remind maintenance personnel of possible ground faults in advance, which is not conducive to taking timely preventive measures. Intermittent ground faults are characterized by short fault occurrence time and unstable fault current. Traditional fault location methods may find it difficult to accurately capture fault information and make correct fault location judgments in a short time.
[0005] Patent document CN220795383U discloses a low-current grounding fault location device with high accuracy. The above patent realizes that the heat dissipation structure can facilitate the heat dissipation of the main body of the device, but the above patent cannot realize the grounding fault early warning function.
[0006] Patent document CN220795432U discloses a multifunctional low-current grounding selection device. The above patent achieves the goal of preventing dust and moisture from entering the grounding selection cabinet and causing corrosion damage to electronic components, thus improving service life. The air can fully contact the particulate desiccant, improving the dehumidification effect, cooling and heat dissipation effect, and heat dissipation efficiency. However, the above patent cannot achieve the function of accurately capturing transient signals.
[0007] In summary, the aforementioned patents cannot achieve ground fault early warning functions and accurate transient signal capture functions, resulting in a lack of effective early warning mechanisms before faults occur, poor adaptability to intermittent ground faults, and inability to accurately capture fault information and make correct line selection judgments in a short period of time.
[0008] Therefore, this application proposes a low-current grounding fault location device that can accurately capture transient signals and provide early warning of grounding faults. Utility Model Content
[0009] The purpose of this invention is to provide a low-current ground fault location device with ground fault early warning, in order to solve the technical problems mentioned in the background art, which are that the ground fault early warning function and the transient signal accurate capture function cannot be realized, resulting in the lack of an effective early warning mechanism before the fault occurs and poor adaptability to intermittent ground faults.
[0010] To achieve the above objectives, this utility model provides the following technical solution: a low-current ground fault location device with ground fault early warning, comprising a cabinet, a power module, a data acquisition component, and an early warning component;
[0011] Both the data acquisition component and the early warning component are installed inside the cabinet, and the power module is connected to the data acquisition component and the early warning component via a data cable.
[0012] The acquisition component is fixedly installed on the inner wall side of the cabinet. The acquisition component includes a current sampling board and a voltage sampling board. The current sampling board is sleeved on the busbar, and the voltage sampling board is connected to the open delta winding of the busbar. The current sampling board is connected to an inductor through a data line. The other end of the outer wall of the inductor is connected to a transistor. The transistor is connected to an analog-to-digital converter through a data line. The analog-to-digital converter is connected to a processor through a parallel interface.
[0013] Preferably, three electric push rods are fixedly installed at the bottom of the outer wall of the cabinet by bolts. The electric push rods have built-in battery cells. A base column is fixedly installed at the bottom of the electric push rod. The bottom of the outer wall of the base column is fixed to the top of the outer wall of the lower base by bolts. A data cable is installed in the hollow interior of the base column. One end of the data cable is connected to the battery pack, and the other end of the data cable is connected to the electronic components inside the cabinet. Two fiberboards are fixedly installed at the front end of the outer wall of the battery pack by bolts.
[0014] Preferably, a copper-clad laminate is fixedly installed on the front end of the outer wall of the cabinet, an interactive display screen is provided in the upper middle part of the outer wall of the copper-clad laminate, the inner wall of the interactive display screen is connected to the processor through a data interface, and an isolation plate is fixedly installed at the connection between the base column and the electric push rod.
[0015] A wiring board is fixedly installed at the bottom of the inner wall of the cabinet, and a comparator, a current sampling board, a voltage sampling board and an inductor are integrated on the outer wall of the wiring board.
[0016] Preferably, the power module includes a battery management unit and a battery pack. The battery management unit is fixedly installed on the outer side of the battery pack. The battery management unit includes a backup battery and a battery management system. The backup battery is connected to the main power supply of the battery pack via a data cable led out from an electronic switch. The output end of the battery pack is connected to a transformer via a data cable.
[0017] Preferably, the warning component includes an indicator light and a comparator. The comparator is connected to the voltage sampling board via a data line. The processor outputs a warning signal according to the warning program. A communication interface is installed on the inner wall of the interactive display screen. The communication interface is connected to an external communication device via a mobile network.
[0018] Preferably, the external gaps of the battery pack are filled with heating wires, a plastic box is fixedly installed on the side of the outer wall of the battery pack, a fan is installed inside the plastic box, the fan's switch interface is connected to a thermistor via a data cable, and the thermistor is connected to one port of the battery pack via a data cable.
[0019] Preferably, an indicator light is fixedly installed below the front end of the outer wall of the copper-clad laminate. One pin of the indicator light is connected to the output pin of the processor, and the other pin of the indicator light is connected to the battery pack. The indicator light is connected to the output of the comparator via a data line. The comparator is connected to the processor via a data interface. The processor processes the line signal by executing a line selection algorithm.
[0020] Compared with the prior art, the beneficial effects of this utility model are:
[0021] 1. This utility model, by installing a data acquisition component and an early warning component, realizes the ground fault early warning function, solves the problem of lacking an effective early warning mechanism before the fault occurs, and reminds maintenance personnel in advance of possible ground faults, which is conducive to taking timely preventive measures;
[0022] 2. This utility model, by installing a voltage sampling board, achieves the function of accurately capturing transient signals, solves the problem of poor adaptability to intermittent grounding faults, and can accurately capture fault information and make correct line selection judgments in a short time. Attached Figure Description
[0023] Figure 1 This is a front view structural diagram of the device of this utility model;
[0024] Figure 2 This is a side view of the device structure of this utility model;
[0025] Figure 3 This is a schematic diagram of the acquisition component of this utility model;
[0026] Figure 4 This is a schematic diagram of the early warning component of this utility model;
[0027] Figure 5 This is a schematic diagram of the main structure of the data acquisition component of this utility model.
[0028] In the diagram: 1. Cabinet; 2. Copper-clad laminate; 3. Interactive display screen; 4. Battery pack; 5. Base column; 6. Indicator light; 7. Fiberboard; 8. Processor; 9. Wiring board; 10. Lower base; 11. Transformer; 12. Comparator; 13. Current sampling board; 14. Voltage sampling board; 15. Inductor; 16. Analog-to-digital converter; 17. Transistor; 18. Isolation board; 19. Heating wire; 20. Fan; 21. Thermistor; 22. Plastic box; 23. Backup battery; 24. Communication interface. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] Please see Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a low-current ground fault location device with ground fault early warning, comprising a cabinet 1, a power module, a data acquisition component, and an early warning component; both the data acquisition component and the early warning component are installed inside the cabinet 1, and the power module is connected to the data acquisition component and the early warning component via a data cable; the data acquisition component is fixedly installed on the inner wall side of the cabinet 1, and the data acquisition component includes a current sampling board 13 and a voltage sampling board 14. The current sampling board 13 is sleeved on the busbar, and the voltage sampling board 14 is connected to the open delta winding of the busbar. The current sampling board 13 is connected to an inductor 15 via a data cable, and the other end of the outer wall of the inductor 15 is connected to a transistor 17. The transistor 17 is connected to an analog-to-digital converter 16 via a data cable, and the analog-to-digital converter 16 is connected to a processor 8 via a parallel interface;
[0033] The power module includes a battery management unit and a battery pack 4. The battery management unit is fixedly installed on the outer side of the battery pack 4. The battery management unit includes a backup battery 23 and a battery management system. The backup battery 23 is connected to the main power supply of the battery pack 4 through a data cable led out by an electronic switch. The output end of the battery pack 4 is connected to a transformer 11 through a data cable.
[0034] Specifically, the current sampling board 13 is installed on the 10kV busbar. During the installation process, the busbar is insulated and protected. The voltage sampling board 14 is accurately connected to the open delta winding of the busbar to artificially simulate a single-phase ground fault. By setting a ground fault point on a specific phase line, the system generates a ground fault phenomenon. At this time, the operation of the device is observed. The current sampling board 13 and the voltage sampling board 14 promptly collect the change signals of zero-sequence current and zero-sequence voltage. After the collected signals are processed by the inductor 15, transistor 17 and analog-to-digital converter 16, they are transmitted to the processor 8. The processor 8 runs the built-in ground fault line selection algorithm to analyze and process the signals, determine the faulty line, and verify the accuracy of the line selection by comparing it with the actual faulty line.
[0035] When a small but abnormal change occurs in the zero-sequence current or zero-sequence voltage in the power system, the early warning component generates an early warning signal.
[0036] Please see Figure 1 , Figure 2 and Figure 5 An embodiment of this utility model is provided: a low-current grounding fault selection device with grounding fault early warning. Three electric push rods are fixedly installed on the bottom of the outer wall of the cabinet 1 by bolts. The electric push rods have built-in battery cells. The bottom of the electric push rods is fixedly installed with a base column 5. The bottom of the outer wall of the base column 5 is fixed to the top of the outer wall of the lower base 10 by bolts. The base column 5 is hollow inside and has a data cable. One end of the data cable is connected to the battery pack 4, and the other end of the data cable is connected to the electronic components inside the cabinet 1. Two fiberboards 7 are fixedly installed on the front end of the outer wall of the battery pack 4 by bolts.
[0037] The warning component includes an indicator light 6 and a comparator 12. The comparator 12 is connected to the voltage sampling board 14 via a data line. The processor 8 outputs a warning signal according to the warning program. The inner wall of the interactive display screen 3 is equipped with a communication interface 24, which is connected to an external communication device via a mobile network.
[0038] Specifically, battery pack 4 continuously supplies power to the electronic components inside cabinet 1, the electric push rod is powered by the built-in battery cells, and the fiberboard 7 provides a certain degree of protection and heat insulation for battery pack 4.
[0039] The voltage sampling board 14 is connected to the open delta winding of the busbar to collect the three-phase voltage and zero-sequence voltage of the power system in real time, and transmits these signals to the processor 8 through the data line. The processor 8 calculates parameters such as the balance of the three-phase voltage through computer algorithms.
[0040] When a fault occurs, the voltage of the faulty phase drops rapidly, while the zero-sequence voltage rises. The voltage sampling board 14 quickly acquires this voltage change signal and transmits it to the comparator 12. Once the zero-sequence voltage exceeds the set 15-volt warning threshold, the comparator 12 immediately sends a trigger signal to the processor 8. The processor 8 generates a warning signal based on the received signal and the built-in warning program. The warning signal drives the indicator light 6 to light up, and on the other hand, the warning signal sends the fault information to an external communication device via the communication interface 24 on the inner wall of the interactive display screen 3 using a mobile network.
[0041] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 This utility model provides an embodiment of a low-current grounding fault location device with grounding fault early warning. A copper-clad laminate 2 is fixedly installed on the front end of the outer wall of the cabinet 1. An interactive display screen 3 is provided in the upper middle part of the outer wall of the copper-clad laminate 2. The inner wall of the interactive display screen 3 is connected to the processor 8 through a data interface. An isolation plate 18 is fixedly installed at the connection between the base column 5 and the electric push rod. A wiring board 9 is fixedly installed at the bottom end of the inner wall of the cabinet 1. A comparator 12, a current sampling board 13, a voltage sampling board 14 and an inductor 15 are integrated on the outer wall of the wiring board 9.
[0042] The external gaps of the battery pack 4 are filled with heating wires 19. A plastic box 22 is fixedly installed on the side of the outer wall of the battery pack 4. A fan 20 is installed inside the plastic box 22. The switch interface of the fan 20 is connected to a thermistor 21 through a data cable. The thermistor 21 is connected to one port of the battery pack 4 through a data cable.
[0043] Specifically, heating wires 19 are filled into the gaps outside the battery pack 4. When the ambient temperature is low, the heating wires 19 are energized and generate heat, keeping the battery pack 4 within the normal operating temperature range. When the temperature of the battery pack 4 rises during operation, the resistance value of the thermistor 21 changes. When the set threshold is reached, the fan 20 is triggered to start. The speed of the fan 20 is adjusted according to the degree of temperature rise of the battery pack 4 through pulse width modulation.
[0044] The current sampling board 13 and the voltage sampling board 14 continuously collect the zero-sequence current and zero-sequence voltage signals of the power system and transmit them to the comparator 12 and the processor 8. The processor 8 runs a method combining wavelet transform and intelligent algorithm to output feature quantities.
[0045] Please see Figure 1 , Figure 2 , Figure 3 and Figure 5 This utility model provides an embodiment of a low-current grounding fault location device with grounding fault early warning. A copper-clad laminate 2 is fixedly installed on the front end of the outer wall of the cabinet 1. An interactive display screen 3 is provided in the upper middle part of the outer wall of the copper-clad laminate 2. The inner wall of the interactive display screen 3 is connected to the processor 8 through a data interface. An isolation plate 18 is fixedly installed at the connection between the base column 5 and the electric push rod. A wiring board 9 is fixedly installed at the bottom end of the inner wall of the cabinet 1. A comparator 12, a current sampling board 13, a voltage sampling board 14 and an inductor 15 are integrated on the outer wall of the wiring board 9.
[0046] An indicator light 6 is fixedly installed on the lower front end of the outer wall of the copper clad laminate 2. One pin of the indicator light 6 is connected to the output pin of the processor 8, and the other pin of the indicator light 6 is connected to the battery pack 4. The indicator light 6 is connected to the output of the comparator 12 via a data line. The comparator 12 is connected to the processor 8 via a data interface. The processor 8 processes the line signal by executing the line selection algorithm.
[0047] Specifically, the current sampling board 13 samples the zero-sequence current at a sampling frequency of 1kHz. After converting the collected analog current signal into a digital signal, it transmits it to the comparator 12 and the processor 8 through the data interface. When the collected zero-sequence current or zero-sequence voltage exceeds the corresponding threshold, the comparator 12 outputs a trigger signal to the indicator light 6 and the processor 8. The processor 8 runs a comprehensive line selection algorithm based on wavelet transform and intelligent group amplitude and phase comparison method to further verify the judgment result of the fault line. The processor 8 determines the fault line number based on the processing results of these algorithms and stores the fault information in the internal memory.
[0048] Battery pack 4 is charged. The charging circuit adopts constant current and constant voltage charging mode. The electric push rod is connected to the base column 5. The position of the isolation plate 18 is adjusted by the control of the processor 8. The wiring board 9 isolates the analog signal acquisition part of the current sampling board 13 and voltage sampling board 14, as well as the digital signal processing part of the comparator 12 and the processor 8 through the ground layer and power layer. The inductor 15 plays the role of filtering and impedance matching in the circuit.
[0049] Working principle: The current sampling board 13 is mounted on the bus to collect the zero-sequence current signal. The collected signal is processed by the inductor 15 and the transistor 17, and then converted into a digital signal by the analog-to-digital converter 16 and transmitted to the processor 8 through the parallel interface. The voltage sampling board 14 is connected to the open delta winding of the bus to collect the zero-sequence voltage signal. This signal is transmitted to the comparator 12 and can also be used by the processor 8 for analysis and processing. The processor 8 receives the digital current signal from the current sampling board 13 and the voltage signal related information from the voltage sampling board 14.
[0050] Comparator 12 compares and judges the signal from voltage sampling board 14. When the warning condition is met, it transmits the warning signal to processor 8 through data line. Processor 8 outputs warning signal according to the warning program. On the one hand, it controls indicator light 6 to light up to warn on-site personnel; on the other hand, it can display relevant fault information and warning information through interactive display screen 3. Interactive display screen 3 can also be used for device parameter setting and other operations. It is connected to processor 8 through data interface for data interaction.
[0051] Battery pack 4 supplies power to all components of the device, and its output is converted to a suitable voltage by transformer 11 for use by each electrical component. Backup battery 23 in the battery management unit is connected to the main power supply of battery pack 4 via an electronic switch, which can switch power supply in case of main power failure. Heating wire 19 fills the gaps of battery pack 4 to heat the battery pack in low-temperature environments. Fan 20 inside plastic box 22 can be activated by thermistor 21 according to the battery pack temperature when the battery pack temperature is too high, so as to dissipate heat and cool the battery pack.
[0052] The communication interface 24 on the inner wall of the interactive display screen 3 can connect to external communication devices via a mobile network, enabling data interaction between the device and a remote control center or other devices.
[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A low-current grounding fault location device with grounding fault early warning, characterized in that: Includes cabinet (1), power module, data acquisition component, and early warning component; The acquisition component and the early warning component are both installed inside the cabinet (1), and the power module is connected to the acquisition component and the early warning component through a data cable; The acquisition component is fixedly installed on the inner wall side of the cabinet (1). The acquisition component includes a current sampling board (13) and a voltage sampling board (14). The current sampling board (13) is sleeved on the busbar. The voltage sampling board (14) is connected to the open delta winding of the busbar. The current sampling board (13) is connected to an inductor (15) through a data line. The other end of the outer wall of the inductor (15) is connected to a transistor (17). The transistor (17) is connected to an analog-to-digital converter (16) through a data line. The analog-to-digital converter (16) is connected to a processor (8) through a parallel interface.
2. A low-current grounding fault location device with grounding fault early warning as described in claim 1, characterized in that: The bottom of the outer wall of the cabinet (1) is fixed with three electric push rods by bolts. The electric push rods have built-in battery cells. The bottom of the electric push rods is fixed with a base column (5). The bottom of the outer wall of the base column (5) is fixed with bolts to the top of the outer wall of the lower base (10). The base column (5) is hollow inside and has a data cable. One end of the data cable is connected to the battery pack (4), and the other end of the data cable is connected to the electronic components inside the cabinet (1). The front end of the outer wall of the battery pack (4) is fixed with two fiberboards (7) by bolts.
3. A low-current grounding fault location device with grounding fault early warning as described in claim 1, characterized in that: A copper-clad plate (2) is fixedly installed on the front end of the outer wall of the cabinet (1). An interactive display screen (3) is provided in the upper middle part of the outer wall of the copper-clad plate (2). The inner wall of the interactive display screen (3) is connected to the processor (8) through a data interface. An isolation plate (18) is fixedly installed at the connection between the base column (5) and the electric push rod. A wiring board (9) is fixedly installed on the bottom of the inner wall of the cabinet (1). A comparator (12), a current sampling board (13), a voltage sampling board (14) and an inductor (15) are integrated on the outer wall of the wiring board (9).
4. A low-current grounding fault location device with grounding fault early warning as described in claim 1, characterized in that: The power module includes a battery management unit and a battery pack (4). The battery management unit is fixedly installed on the outer side of the battery pack (4). The battery management unit includes a backup battery (23) and a battery management system. The backup battery (23) is connected to the main power supply of the battery pack (4) by a data line led out through a connecting electronic switch. The output end of the battery pack (4) is connected to a transformer (11) through a data line.
5. A low-current grounding fault location device with grounding fault early warning according to claim 1, characterized in that: The warning component includes an indicator light (6) and a comparator (12). The comparator (12) is connected to the voltage sampling board (14) via a data line. The processor (8) outputs a warning signal according to the warning program. The interactive display screen (3) has a communication interface (24) installed on its inner wall. The communication interface (24) is connected to an external communication device via a mobile network.
6. A low-current grounding fault location device with grounding fault early warning according to claim 2, characterized in that: The battery pack (4) has a heating wire (19) filling the external gap. A plastic box (22) is fixedly installed on the outer side of the battery pack (4). A fan (20) is installed inside the plastic box (22). The switch interface of the fan (20) is connected to a thermistor (21) through a data cable. The thermistor (21) is connected to one port of the battery pack (4) through a data cable.
7. A low-current grounding fault location device with grounding fault early warning according to claim 3, characterized in that: An indicator light (6) is fixedly installed on the lower front end of the outer wall of the copper clad laminate (2). One pin of the indicator light (6) is connected to the output pin of the processor (8), and the other pin of the indicator light (6) is connected to the battery pack (4). The indicator light (6) is connected to the output of the comparator (12) via a data line. The comparator (12) is connected to the processor (8) via a data interface. The processor (8) processes the line signal by executing the line selection algorithm.