Direct-current floating ground system, fault detection method and apparatus, and medium and program
By introducing a reference plane that is not equal to the ground level in the DC floating ground system, and using electrical parameters to calculate the equivalent resistance difference and voltage and current changes, fault detection of the DC floating ground system is realized, which solves the safety hazards caused by the wide distribution of lines and improves the system's safety and the accuracy of fault detection.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-09-22
- Publication Date
- 2026-06-11
Smart Images
Figure CN2025122911_11062026_PF_FP_ABST
Abstract
Description
DC floating ground system, fault detection methods, devices, media and procedures
[0001] Cross-references to related applications
[0002] This application is based on and claims priority to CN application No. 202411767301.7, filed on December 4, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field
[0003] This disclosure relates to the field of DC floating ground technology, and in particular to a DC floating ground system, fault detection method, device, medium and program. Background Technology
[0004] In related technologies, more and more high-voltage DC equipment, such as DC charging piles and DC motors, are emerging and serving industrial production and daily life, and DC systems are becoming increasingly common. Traditional power supply systems are all grounded systems. When a person touches a wire in this system, a circuit is formed between the human body and the ground, and current flows through the body, causing an electric shock. However, DC floating ground systems are not connected to the ground. When a person touches one of the wires, no circuit is formed with the ground or other conductors, thus preventing electric shock. Summary of the Invention
[0005] According to one aspect of this disclosure, a DC floating ground system is provided, comprising: a DC power supply, the DC power supply being ungrounded; a load electrically connected to the DC power supply; a first module configured to acquire a first electrical parameter of the load and transmit the first electrical parameter to a second module; and a second module configured to acquire a second electrical parameter of the DC power supply and determine whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter; wherein the second module is connected to the first module to form a common reference plane, the level of the reference plane being not equal to the ground level, and both the first electrical parameter and the second electrical parameter being electrical parameters based on the reference plane.
[0006] In some embodiments, the second module is used to calculate the parameter difference between the first electrical parameter and the second electrical parameter, and if the parameter difference is outside a predetermined range, it determines that the DC floating ground system has malfunctioned.
[0007] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane.
[0008] In some embodiments, the second module is used to calculate a first resistance difference between the first equivalent resistance value and the third equivalent resistance value, and a second resistance difference between the second equivalent resistance value and the fourth equivalent resistance value, and to determine that the DC floating ground system has malfunctioned when at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range.
[0009] In some embodiments, the first module is used to acquire the first positive voltage and first positive current of the positive terminal of the load relative to the reference plane, and the first negative voltage and first negative current of the negative terminal of the load relative to the reference plane, calculate the first equivalent resistance value based on the first positive voltage and the first positive current, and calculate the second equivalent resistance value based on the first negative voltage and the first negative current; the second module is used to acquire the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, and the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane, calculate the third equivalent resistance value based on the second positive voltage and the second positive current, and calculate the fourth equivalent resistance value based on the second negative voltage and the second negative current.
[0010] In some embodiments, the first electrical parameters further include: a first positive voltage and a first positive current of the positive terminal of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative terminal of the load relative to the reference plane; the second electrical parameters further include: a second positive voltage and a second positive current of the positive terminal of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative terminal of the DC power supply relative to the reference plane.
[0011] In some embodiments, the second module is further configured to determine whether the DC floating ground system has malfunctioned based on the changes in the voltage and current of the load and the changes in the voltage and current of the DC power supply, when both the first resistance difference and the second resistance difference are within the predetermined resistance range.
[0012] In some embodiments, the second module is configured to determine that the DC floating ground system has malfunctioned if, when both the first resistance difference and the second resistance difference are within a predetermined resistance range, at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases, and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases.
[0013] In some embodiments, the DC floating ground system further includes: an information management platform for displaying fault information and alarm information received from the second module; wherein the second module is further configured to trigger an alarm when a fault is determined to have occurred in the DC floating ground system, and transmit the corresponding fault information and alarm information to the information management platform.
[0014] In some embodiments, the second module is further configured to control the activation of the protection device of the DC floating ground system when a fault occurs in the DC floating ground system and the duration of the fault reaches a predetermined duration.
[0015] According to another aspect of this disclosure, a fault detection method for a DC floating ground system is provided, wherein the DC floating ground system includes: a DC power supply, a load, a first module, and a second module, wherein the DC power supply is not grounded, and the load is electrically connected to the DC power supply; the fault detection method includes: the first module acquiring a first electrical parameter of the load and transmitting the first electrical parameter to the second module; and the second module acquiring a second electrical parameter of the DC power supply and determining whether a fault has occurred in the DC floating ground system based on the second electrical parameter and the first electrical parameter; wherein the second module is connected to the first module to form a common reference plane, the level of the reference plane is not equal to the ground level, and both the first electrical parameter and the second electrical parameter are electrical parameters based on the reference plane.
[0016] In some embodiments, the second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, including: the second module calculates the parameter difference between the first electrical parameter and the second electrical parameter, and determines that the DC floating ground system has malfunctioned if the parameter difference is outside a predetermined range.
[0017] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane.
[0018] In some embodiments, the second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, including: the second module calculating a first resistance difference between the first equivalent resistance value and the third equivalent resistance value, and a second resistance difference between the second equivalent resistance value and the fourth equivalent resistance value; and determining that the DC floating ground system has malfunctioned if at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range.
[0019] In some embodiments, the first module acquires the first electrical parameters of the load, including: the first module acquiring the first positive voltage and first positive current of the load's positive terminal relative to the reference plane, and the first negative voltage and first negative current of the load's negative terminal relative to the reference plane; calculating the first equivalent resistance value based on the first positive voltage and the first positive current; and calculating the second equivalent resistance value based on the first negative voltage and the first negative current. The second module acquires the second electrical parameters of the DC power supply, including: the second module acquiring the second positive voltage and second positive current of the DC power supply's positive terminal relative to the reference plane, and the second negative voltage and second negative current of the DC power supply's negative terminal relative to the reference plane; calculating the third equivalent resistance value based on the second positive voltage and the second positive current; and calculating the fourth equivalent resistance value based on the second negative voltage and the second negative current.
[0020] In some embodiments, the first electrical parameters further include: a first positive voltage and a first positive current of the positive terminal of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative terminal of the load relative to the reference plane; the second electrical parameters further include: a second positive voltage and a second positive current of the positive terminal of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative terminal of the DC power supply relative to the reference plane.
[0021] In some embodiments, the second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, further comprising: when the first resistance difference and the second resistance difference are both within the predetermined resistance range, the second module determines whether the DC floating ground system has malfunctioned based on the changes in the voltage and current of the load and the changes in the voltage and current of the DC power supply.
[0022] In some embodiments, when both the first resistance difference and the second resistance difference are within the predetermined resistance range, the second module determines whether the DC floating ground system has malfunctioned based on the changes in the voltage and current of the load and the voltage and current of the DC power supply. This includes: when both the first resistance difference and the second resistance difference are within the predetermined resistance range, if at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases, and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases, then the second module determines that the DC floating ground system has malfunctioned.
[0023] In some embodiments, the fault detection method further includes: the second module triggering an alarm when it determines that a fault has occurred in the DC floating ground system, and transmitting the corresponding fault information and alarm information to the information management platform to display the fault information and the alarm information.
[0024] In some embodiments, the fault detection method further includes: when the DC floating ground system experiences a fault and the duration of the fault reaches a predetermined duration, the second module controls the activation of the protection device of the DC floating ground system.
[0025] According to another aspect of this disclosure, a fault detection device for a DC floating ground system is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the fault detection method as described above based on instructions stored in the memory.
[0026] According to another aspect of this disclosure, a DC floating ground system is provided, comprising: the fault detection device as described above.
[0027] According to another aspect of this disclosure, a computer-readable storage medium is provided having computer instructions stored thereon that, when executed by a processor, implement the fault detection method as described above.
[0028] According to another aspect of this disclosure, a computer program is provided, comprising: instructions that, when executed by a processor, cause the processor to perform the fault detection method as described above.
[0029] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0030] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.
[0031] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:
[0032] Figure 1 is a schematic block diagram illustrating the structure of a DC floating ground system according to some embodiments of the present disclosure;
[0033] Figure 2 is a schematic block diagram illustrating the structure of a DC floating ground system according to other embodiments of the present disclosure;
[0034] Figure 3 is a flowchart illustrating a fault detection method for a DC floating ground system according to some embodiments of the present disclosure;
[0035] Figure 4 is a flowchart illustrating a fault detection method for a DC floating ground system according to some other embodiments of the present disclosure;
[0036] Figure 5 is a schematic structural block diagram illustrating a fault detection device for a DC floating ground system according to some embodiments of the present disclosure;
[0037] Figure 6 is a schematic block diagram illustrating the structure of a fault detection device for a DC floating ground system according to other embodiments of the present disclosure. Detailed Implementation
[0038] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.
[0039] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.
[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.
[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0042] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0044] The inventors of this disclosure have discovered that, due to the numerous and widely distributed lines in a DC floating ground system, arcing and poor insulation are prone to occur, potentially causing DC power short circuits, equipment burnout, and even threatening the personal safety of on-site maintenance personnel. In related technologies, DC floating ground systems lack fault detection capabilities.
[0045] In view of this, embodiments of the present disclosure provide a DC floating ground system to provide fault detection functionality within the DC floating ground system.
[0046] Figure 1 is a schematic block diagram illustrating the structure of a DC floating ground system according to some embodiments of the present disclosure. As shown in Figure 1, the DC floating ground system includes: a DC power supply 110, a load 120, a first module (also referred to as a slave module) 131, and a second module (also referred to as a master module) 132.
[0047] DC power supply 110 is not grounded. Load 120 is electrically connected to DC power supply 110. For example, the positive terminal of load 120 is electrically connected to the positive terminal DC+ of DC power supply 110, and the negative terminal of load 120 is electrically connected to the negative terminal DC- of DC power supply 110.
[0048] The first module 131 can be installed near the load 120. The second module 132 can be installed on or near the DC power supply 110. The first module and the second module can interact in real time via wireless communication or wired communication. For example, the first module and the second module can be implemented as circuits respectively; that is, the first module can be a first circuit, and the second module can be a second circuit. Alternatively, the first module can be a first device, and the second module can be a second device. The second module 132 is connected to the first module 131 to form a common reference plane, the level of which is not equal to the ground level.
[0049] Here, the reference plane formed by connecting the second module 132 and the first module 131 is a potential plane (i.e., voltage level). Since the DC power supply is not grounded, the voltage level of this reference plane is not equal to the ground level; that is, this reference plane is not the earth. This reference plane serves as the base plane for obtaining electrical parameters. In other words, the acquisition or calculation of electrical parameters is based on this reference plane, which will be described in detail later.
[0050] The first module 131 is used to obtain the first electrical parameters of the load and transmit the first electrical parameters to the second module.
[0051] For example, a DC floating ground system may include one or more loads, each load connected to a first module. Correspondingly, the DC floating ground system may also include one or more first modules. Each first module is used to acquire the first electrical parameters of the corresponding load and transmit these parameters to a second module. Since one first module can be installed on each load branch, this facilitates more precise fault location.
[0052] The second module 132 is used to acquire the second electrical parameters of the DC power supply and determine whether the DC floating ground system has a fault based on the second electrical parameters and the first electrical parameters.
[0053] Here, both the first electrical parameter and the second electrical parameter are electrical parameters based on a reference plane. In other words, the first electrical parameter and the second electrical parameter are electrical parameters obtained with the reference plane as the base plane for the electrical parameters.
[0054] Thus, a DC floating ground system according to some embodiments of this disclosure is provided. The DC floating ground system includes: a DC power supply, which is not grounded; a load electrically connected to the DC power supply; a first module for acquiring first electrical parameters of the load and transmitting the first electrical parameters to a second module; and a second module for acquiring second electrical parameters of the DC power supply and determining whether a fault has occurred in the DC floating ground system based on the second electrical parameters and the first electrical parameters. The second module is connected to the first module to form a common reference plane, the level of which is not equal to the ground level, and both the first and second electrical parameters are electrical parameters based on the reference plane. In this system, by acquiring electrical parameters based on the common reference plane through the first and second modules and determining whether a fault has occurred in the DC floating ground system based on these electrical parameters, a fault detection function is provided in the DC floating ground system, realizing fault detection of the DC floating ground system. When the DC floating ground system is not grounded, using the plane formed by connecting the second module and the first module as a common reference plane facilitates the acquisition and calculation of electrical parameters, thereby facilitating the implementation of fault detection. Furthermore, since this DC floating ground system is not connected to the earth, touching any of the power lines in the system will not cause an electric shock, thus improving the system's safety.
[0055] In some embodiments, the second module 132 is used to calculate the parameter difference between the first electrical parameter and the second electrical parameter, and if the parameter difference is outside a predetermined range, it is determined that a fault has occurred in the DC floating ground system. This enables fault detection of the DC floating ground system, improving the safety and reliability of system operation.
[0056] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane. In this embodiment, using the equivalent resistance as an electrical parameter for fault detection can comprehensively reflect the fault status of the system. Therefore, using the equivalent resistance for fault detection can improve the accuracy of fault detection.
[0057] For example, the second module 132 is used to calculate a first resistance difference between a first equivalent resistance value and a third equivalent resistance value, and a second resistance difference between a second equivalent resistance value and a fourth equivalent resistance value. If at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range, a fault is determined in the DC floating ground system. In this embodiment, using the difference between the equivalent resistance of the load and the equivalent resistance of the DC power supply to determine whether a fault has occurred can improve the accuracy of fault detection.
[0058] It should be noted that, theoretically, if the first and third equivalent resistance values are equal, and the second and fourth equivalent resistance values are equal, the DC floating ground system is not faulty. However, in practice, the first module incorporates the influence of the circuit impedance during calculation. Therefore, the corresponding equivalent resistance values at the DC power supply end and the load end will not be exactly equal. In this case, it can be determined whether the difference between the corresponding equivalent resistance values is outside a predetermined allowable resistance range. If the difference is outside the predetermined resistance range, then the DC floating ground system is determined to have faulted.
[0059] For example, the predetermined resistance range can be [-50Ω, 50Ω]. Of course, this predetermined resistance range is merely exemplary, and the scope of this disclosure is not limited to the specific values within the predetermined resistance range. Those skilled in the art will understand that the predetermined resistance range can be set according to actual needs.
[0060] The previous section described a method for determining whether a fault has occurred using equivalent resistance. The following section describes the origin of this equivalent resistance value.
[0061] For example, the first module 131 is used to collect the first positive voltage and first positive current of the load's positive terminal relative to the reference plane, and the first negative voltage and first negative current of the load's negative terminal relative to the reference plane. Based on the first positive voltage and first positive current, a first equivalent resistance value is calculated, and based on the first negative voltage and first negative current, a second equivalent resistance value is calculated. This allows the equivalent resistance of the load to be obtained, facilitating subsequent use of the equivalent resistance value to determine whether a fault has occurred.
[0062] In the above embodiment, the first positive voltage is the voltage of the positive terminal of the load relative to the reference plane, the first positive current is the current flowing through the positive terminal of the load under the first positive voltage, the first negative voltage is the voltage of the negative terminal of the load relative to the reference plane, and the first negative current is the current flowing through the negative terminal of the load under the first negative voltage; the first equivalent resistance is the ratio of the first positive voltage to the first positive current, and the second equivalent resistance is the ratio of the first negative voltage to the first negative current.
[0063] For example, the second module 132 is used to acquire the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, and the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane. Based on the second positive voltage and second positive current, a third equivalent resistance value is calculated, and based on the second negative voltage and second negative current, a fourth equivalent resistance value is calculated. This allows the equivalent resistance of the DC power supply terminals to be obtained, facilitating subsequent use of the equivalent resistance value to determine whether a fault has occurred.
[0064] In the above embodiment, the second positive voltage is the voltage of the positive terminal of the DC power supply relative to the reference plane, the second positive current is the current flowing through the positive terminal of the DC power supply under the second positive voltage, the second negative voltage is the voltage of the negative terminal of the DC power supply relative to the reference plane, and the second negative current is the current flowing through the negative terminal of the DC power supply under the second negative voltage; the third equivalent resistance is the ratio of the second positive voltage to the second positive current, and the fourth equivalent resistance is the ratio of the second negative voltage to the second negative current.
[0065] In some embodiments, the first electrical parameter may further include: a first positive voltage and a first positive current of the load's positive terminal relative to the reference plane, and a first negative voltage and a first negative current of the load's negative terminal relative to the reference plane; the second electrical parameter may further include: a second positive voltage and a second positive current of the DC power supply's positive terminal relative to the reference plane, and a second negative voltage and a second negative current of the DC power supply's negative terminal relative to the reference plane. That is, in addition to the equivalent resistance value, parameters such as the voltage and current of the load and the DC power supply can also be used as electrical parameters. This allows for a comprehensive consideration of multiple electrical parameters, thereby further improving the accuracy of fault detection in the DC floating ground system.
[0066] In some embodiments, the second module 132 is further configured to determine whether a fault has occurred in the DC floating ground system based on changes in the voltage and current of the load and the DC power supply, provided that both the first resistance difference and the second resistance difference are within a predetermined resistance range. In this embodiment, in addition to the equivalent resistance, changes in electrical parameters such as voltage and current are also considered to determine whether a fault has occurred in the system, thereby improving the accuracy of fault detection in the DC floating ground system.
[0067] For example, the first module 131 can also be used to acquire changes in the first electrical parameter and transmit the changes in the first electrical parameter to the second module 132. For example, the second module 132 can also be used to acquire changes in the second electrical parameter and determine whether a fault has occurred in the DC floating ground system based on the changes in the first and second electrical parameters.
[0068] It should be noted that the change in electrical parameters here refers to the change in electrical parameters over time. By comparing the value of the electrical parameter at the previous moment with its value at the current moment, we can determine whether the electrical parameter has increased or decreased, thus obtaining the change in the electrical parameter. This electrical parameter can be, as mentioned above, voltage, current, or equivalent resistance, etc.
[0069] For example, the second module 132 can be used to determine that the DC floating ground system has malfunctioned when at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases, provided that both the first resistance difference and the second resistance difference are within a predetermined resistance range.
[0070] That is, if the equivalent resistance value meets the predetermined resistance value range, the DC floating ground system can be determined by combining the changes in voltage and current. If the voltage (i.e., at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage) decreases and the current (i.e., at least one of the first positive current, the first negative current, the second positive current, and the second negative current) increases, the DC floating ground system is determined to be faulty; otherwise, the DC floating ground system is determined not to be faulty.
[0071] For example, when an insulation failure occurs (e.g., a wire is grounded), the system will experience a voltage drop and a significant increase in current due to a short circuit. Therefore, if the equivalent resistance value meets the predetermined resistance range, it is possible to determine whether a fault has occurred by detecting changes in voltage and current.
[0072] Therefore, in the above embodiments, the equivalent resistance, voltage and current are taken into account in fault detection, which can improve the accuracy of fault detection.
[0073] Figure 2 is a schematic structural block diagram illustrating a DC floating ground system according to some other embodiments of the present disclosure. As shown in Figure 2, the DC floating ground system includes: a DC power supply 110, a load 120, a first module 131, and a second module 132.
[0074] As shown in Figure 2, the DC floating ground system may also include an information management platform (also known as an information management system) 140. For example, the information management system can be an IEMS (Informationized Energy Management System). IEMS is based on energy information technology and builds a distributed, point-to-point, collaborative grid-based hierarchical energy information architecture, including an energy equipment layer, data link layer, information control layer, information management layer, and business user layer, to realize a lightweight and freely accessible energy internet system.
[0075] The information management platform 140 is used to display fault information and alarm information received from the second module 132. Here, the second module 132 can also be used to trigger an alarm when a fault is detected in the DC floating ground system, and transmit the corresponding fault information and alarm information to the information management platform. This allows staff to remotely monitor the operation status and abnormal alarms of the DC floating ground system on the information management platform.
[0076] For example, the second module is equipped with an alarm unit that is triggered when a fault is detected in the DC floating ground system.
[0077] For example, the second module can upload the analysis results to the gateway via wireless transmission, and the gateway will then upload them to the IEMS information management platform, where the operation status and abnormal alarms can be viewed remotely.
[0078] In some embodiments, the second module 132 can also be used to control the activation of the protection device of the DC floating ground system when a fault occurs in the DC floating ground system and the duration of the fault reaches a predetermined duration. This can protect the system in the event of a fault, improving the system's safety and reliability.
[0079] For example, the aforementioned predetermined duration can range from a few seconds to one minute. Of course, the scope of this disclosure is not limited to the specific value of the predetermined duration. The predetermined duration can be set according to the actual situation or needs.
[0080] This concludes the detailed description of some embodiments of the DC floating ground system. Unlike ordinary power systems, this system is not grounded; it is a floating ground system. As long as a person does not simultaneously touch the positive and negative terminals of the power supply, they will not experience electric shock. For example, if only the positive or negative terminal is touched, because the system is floating, no current loop is formed between the person and the ground, so there is no risk of electric shock. In this system, the load can include all DC-powered devices. The first and second modules are connected to form a common reference plane, which is not the ground. During system operation, the two modules collect data from the power supply and load terminals in real time, calculate the equivalent resistance relative to the reference plane, and interact in real time via wireless communication. After data comparison and analysis, the second module uploads the analysis results wirelessly to the gateway, which then uploads them to the IEMS information management platform, where the operating status and abnormal alarms can be remotely monitored.
[0081] Before an arc or insulation failure occurs, the system is in a stable operating state. When the data shows a difference that exceeds a predetermined range, it indicates that the system state has changed. The change in the system will affect the change in the system impedance. Assuming that the load operating mode has changed, the change in specific data can be used to determine whether an arc or insulation failure has occurred.
[0082] It should be noted that, in some embodiments, the short-range wireless communication frequency of this system can be 433MHz, or it can be 470MHz to 510MHz, or it can be in the 2.4GHz band. The scope of this disclosure is not limited to the specific value of the wireless communication frequency, which can be set according to actual needs.
[0083] Figure 3 is a flowchart illustrating a fault detection method for a DC floating ground system according to some embodiments of the present disclosure. The DC floating ground system includes a DC power supply, a load, a first module, and a second module. The DC power supply is not grounded. The load is electrically connected to the DC power supply. As shown in Figure 3, the fault detection method includes steps S302 to 304.
[0084] In step S302, the first module obtains the first electrical parameters of the load and transmits the first electrical parameters to the second module.
[0085] In step S304, the second module obtains the second electrical parameters of the DC power supply and determines whether the DC floating ground system has malfunctioned based on the second electrical parameters and the first electrical parameters.
[0086] The second module is connected to the first module to form a common reference plane, the voltage level of which is not equal to the ground voltage level. Both the first and second electrical parameters are electrical parameters based on the reference plane.
[0087] This provides a fault detection method for a DC floating ground system according to some embodiments of the present disclosure. The fault detection method includes: a first module acquiring first electrical parameters of the load and transmitting the first electrical parameters to a second module; and a second module acquiring second electrical parameters of the DC power supply and determining whether a fault has occurred in the DC floating ground system based on the second electrical parameters and the first electrical parameters; wherein the second module is connected to the first module to form a common reference plane, the level of the reference plane is not equal to the ground level, and both the first and second electrical parameters are electrical parameters based on the reference plane. In this method, by acquiring electrical parameters based on a common reference plane through the first and second modules and determining whether a fault has occurred in the DC floating ground system based on these electrical parameters, a fault detection function is provided in the DC floating ground system, realizing fault detection of the DC floating ground system. Moreover, when the DC floating ground system is not grounded, using the plane formed by connecting the second module and the first module as a common reference plane facilitates the acquisition and calculation of electrical parameters, thereby facilitating the implementation of fault detection.
[0088] In some embodiments, the second module determines whether a fault has occurred in the DC floating ground system based on a second electrical parameter and a first electrical parameter, including: the second module calculates the parameter difference between the first electrical parameter and the second electrical parameter; if the parameter difference is outside a predetermined range, it determines that a fault has occurred in the DC floating ground system. This enables fault detection of the DC floating ground system, improving the safety and reliability of system operation.
[0089] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane. In this embodiment, using the equivalent resistance as an electrical parameter for fault detection can comprehensively reflect the fault status of the system. Therefore, using the equivalent resistance for fault detection can improve the accuracy of fault detection.
[0090] In some embodiments, the second module determines whether a fault has occurred in the DC floating ground system based on a second electrical parameter and a first electrical parameter, including: the second module calculating a first resistance difference between a first equivalent resistance value and a third equivalent resistance value, and a second resistance difference between a second equivalent resistance value and a fourth equivalent resistance value; and determining that a fault has occurred in the DC floating ground system if at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range. In this embodiment, using the difference between the equivalent resistance of the load and the equivalent resistance of the DC power supply to determine whether a fault has occurred can improve the accuracy of fault detection.
[0091] In some embodiments, the first module acquires the first electrical parameters of the load, including: the first module acquiring the first positive voltage and first positive current of the load's positive terminal relative to a reference plane, and the first negative voltage and first negative current of the load's negative terminal relative to the reference plane; calculating a first equivalent resistance value based on the first positive voltage and first positive current; and calculating a second equivalent resistance value based on the first negative voltage and first negative current. This allows the equivalent resistance of the load to be obtained, facilitating subsequent determination of whether a fault has occurred using the equivalent resistance value.
[0092] In some embodiments, the second module acquires second electrical parameters of the DC power supply, including: the second module acquiring the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane, calculating a third equivalent resistance value based on the second positive voltage and second positive current, and calculating a fourth equivalent resistance value based on the second negative voltage and second negative current. This allows the equivalent resistance of the DC power supply terminals to be obtained, facilitating subsequent use of the equivalent resistance value to determine whether a fault has occurred.
[0093] In some embodiments, the first electrical parameters further include: a first positive voltage and a first positive current of the load's positive terminal relative to the reference plane, and a first negative voltage and a first negative current of the load's negative terminal relative to the reference plane; the second electrical parameters further include: a second positive voltage and a second positive current of the DC power supply's positive terminal relative to the reference plane, and a second negative voltage and a second negative current of the DC power supply's negative terminal relative to the reference plane. In this embodiment, parameters such as the voltage and current of the load and the DC power supply can also be used as electrical parameters, thus comprehensively considering the situation of multiple electrical parameters, thereby further improving the accuracy of fault detection in the DC floating ground system.
[0094] In some embodiments, the second module determines whether a fault has occurred in the DC floating ground system based on the second electrical parameter and the first electrical parameter. This further includes: if both the first resistance difference and the second resistance difference are within a predetermined resistance range, the second module determines whether a fault has occurred in the DC floating ground system based on changes in the voltage and current of the load and the voltage and current of the DC power supply. In this embodiment, in addition to the equivalent resistance, changes in electrical parameters such as voltage and current are combined to determine whether a system fault has occurred, thus improving the accuracy of fault detection in the DC floating ground system.
[0095] In some embodiments, when both the first resistance difference and the second resistance difference are within a predetermined resistance range, the second module determines whether a fault has occurred in the DC floating ground system based on changes in the load voltage and current and changes in the DC power supply voltage and current. This includes: when both the first resistance difference and the second resistance difference are within the predetermined resistance range, if at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases, and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases, then the second module determines that a fault has occurred in the DC floating ground system. In this embodiment, the equivalent resistance, voltage, and current are comprehensively considered in fault detection, which can improve the accuracy of fault detection.
[0096] In some embodiments, the fault detection method may further include: a second module triggering an alarm upon determining that a fault has occurred in the DC floating ground system, and transmitting the corresponding fault information and alarm information to an information management platform for display. This allows staff to remotely monitor the operation status and abnormal alarms of the DC floating ground system on platforms such as the information management platform.
[0097] In some embodiments, the fault detection method may further include: when a fault occurs in the DC floating ground system and the duration of the fault reaches a predetermined duration, the second module controls the activation of the protection device of the DC floating ground system. This can protect the system in the event of a fault, improving the system's safety and reliability.
[0098] In some embodiments of this disclosure, a first module (online arc and insulation detection slave module) and a second module (online arc and insulation detection master module) are integrated into a DC floating ground system. The second module can be installed at the DC power supply end, and the first module can be installed near the load end. The two modules are connected to form a reference plane. In the DC floating ground system, the two modules respectively collect and calculate the equivalent resistance value relative to the reference plane. The two modules interact and compare the analysis via wireless communication, which can monitor the real-time operating status of the entire system and reduce the complexity of wiring. When a DC arc or insulation failure occurs at a certain point in the system, it will cause a change in the equivalent resistance value of the power supply end and the load end relative to the reference plane. The data exchanged between the two modules can reflect the change in status, thereby judging the system fault, and then triggering an alarm. In case of a continuous fault, the power supply is disconnected to protect the circuit system. The modules also upload the data to the IEMS information management system via wireless transmission, and the data and operating status can be viewed remotely on the system.
[0099] The aforementioned ungrounded system helps create a safer DC system, reducing the probability of electric shock by 50%. Online real-time monitoring can promptly and quickly detect system anomalies, reducing the occurrence of accidents and thus improving the safety and reliability of DC system operation.
[0100] Figure 4 is a flowchart illustrating a fault detection method for a DC floating ground system according to some other embodiments of the present disclosure. As shown in Figure 4, the fault detection method includes steps S402 to S420. Steps S402 to S404 are executed by a first module, and steps S406 to S420 are executed by a second module.
[0101] In step S402, voltage is acquired. That is, the first module acquires the first positive voltage of the load's positive terminal relative to the reference plane and the first negative voltage of the load's negative terminal relative to the reference plane. In addition, the first module can also acquire the first positive current of the load's positive terminal and the first negative current of the load's negative terminal.
[0102] In step S404, the equivalent resistance is calculated. That is, the first module calculates the first equivalent resistance value of the positive terminal of the load and the second equivalent resistance value of the negative terminal of the load based on the collected parameters such as the voltage and current of the load. Furthermore, the first module transmits the equivalent resistance value, voltage, and current data to the second module.
[0103] In step S406, voltage is acquired. That is, the second module acquires the second positive voltage of the positive terminal of the DC power supply relative to the reference plane and the second negative voltage of the negative terminal of the DC power supply relative to the reference plane. Additionally, the second module can also acquire the second positive current of the positive terminal of the DC power supply and the second negative current of the negative terminal of the DC power supply.
[0104] In step S408, the equivalent resistance is calculated. That is, the second module calculates the third equivalent resistance of the positive terminal and the fourth equivalent resistance of the negative terminal of the DC power supply based on the collected parameters such as voltage and current of the DC power supply.
[0105] In step S410, the data is analyzed. That is, the second module analyzes data such as the equivalent resistance, voltage, and current of the load and the DC power supply.
[0106] In step S412, it is determined whether the data is normal. If it is, the process proceeds to step S414; otherwise, the process proceeds to step S416.
[0107] In step S414, the data is uploaded to the information management platform. For example, if the data is normal, the normal data is uploaded to the information management platform.
[0108] In step S416, an alarm is triggered. For example, the second module is equipped with an alarm unit that triggers an alarm in case of data anomalies. Furthermore, the second module can also upload alarm and fault information to the information management platform.
[0109] In step S418, it is determined whether the exception continues. If it does, the process proceeds to step S420; otherwise, the process proceeds to step S414. For example, if the exception does not continue, the information indicating the end of the exception is uploaded to the information management platform.
[0110] In step S420, the protection device is activated. That is, if the abnormality persists, the protection device is activated to protect the DC floating ground system.
[0111] This provides a fault detection method for a DC floating ground system according to other embodiments of the present disclosure. In this method, when the system is operating normally, a second module obtains the voltage, current, and equivalent resistance at the power supply end, while a first module obtains the voltage, current, and equivalent resistance at the load end. The first module transmits the data collected and calculated from the load side to the second module. The second module compares and analyzes its own data with the received data and uploads the analysis results to an information management platform. When a fault such as a DC arc occurs or insulation failure occurs, the data from the second module and the received data from the first module will show a difference exceeding a predetermined range. Analyzing the data changes can determine that a system fault or abnormality has occurred. The second module can wirelessly transmit the abnormal data and abnormal flags to a gateway and upload them to the information management platform.
[0112] Here, abnormal data refers to data that deviates from the system's stable state. The module can further analyze the abnormal data to determine if it occurred due to changes in load operating mode, load failure, DC arcing in the circuit, or insulation failure, and mark it using anomaly flags.
[0113] Figure 5 is a schematic block diagram illustrating the structure of a fault detection device for a DC floating ground system according to some embodiments of the present disclosure. The fault detection device includes a memory 510 and a processor 520. Wherein:
[0114] The memory 510 may be a disk, flash memory, or any other non-volatile storage medium. The memory is used to store instructions in the embodiments corresponding to FIG3 and / or FIG4.
[0115] Processor 520 is coupled to memory 510 and can be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. Processor 520 executes instructions stored in memory, enabling fault detection of the DC floating ground system.
[0116] In some embodiments, as shown in FIG6, the fault detection device 600 may also include a memory 610 and a processor 620. The processor 620 is coupled to the memory 610 via a BUS bus 630. The fault detection device 600 may also be connected to an external storage device 650 via a storage interface 640 to access external data, and may also be connected to a network or another computer system (not shown) via a network interface 660, which will not be described in detail here.
[0117] In this embodiment, data instructions are stored in a memory and then processed by a processor to achieve fault detection of the DC floating ground system.
[0118] In some embodiments of this disclosure, a DC floating ground system is also provided, including: a fault detection device as described above (e.g., a fault detection device as shown in FIG5 or FIG6).
[0119] In some embodiments, this disclosure also provides a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) having computer program instructions stored thereon that, when executed by a processor, implement the steps of the methods in the embodiments corresponding to FIG3 and / or FIG4. Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0120] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.
[0121] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.
[0122] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.
[0123] In some embodiments of this disclosure, a computer program product is also provided, which includes a computer program or instructions that, when executed by a processor, implement the fault detection method as described above.
[0124] In some embodiments of this disclosure, a computer program is also provided, comprising: instructions that, when executed by a processor, cause the processor to perform the fault detection method as described above.
[0125] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.
[0126] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.
Claims
1. A DC floating ground system, comprising: A DC power supply, which is not grounded; The load is electrically connected to the DC power supply. The first module is used to acquire the first electrical parameters of the load and transmit the first electrical parameters to the second module; and The second module is used to acquire the second electrical parameters of the DC power supply, and determine whether the DC floating ground system has malfunctioned based on the second electrical parameters and the first electrical parameters; The second module is connected to the first module to form a common reference plane. The level of the reference plane is not equal to the ground level. Both the first electrical parameter and the second electrical parameter are electrical parameters based on the reference plane.
2. The DC floating ground system according to claim 1, wherein: The second module is used to calculate the parameter difference between the first electrical parameter and the second electrical parameter, and if the parameter difference is outside a predetermined range, it determines that the DC floating ground system has failed.
3. The DC floating ground system according to claim 2, wherein: The first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; The second electrical parameter includes: the third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and the fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane.
4. The DC floating ground system according to claim 3, wherein, The second module is used to calculate a first resistance difference between the first equivalent resistance value and the third equivalent resistance value, and a second resistance difference between the second equivalent resistance value and the fourth equivalent resistance value. If at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range, the DC floating ground system is determined to have a fault.
5. The DC floating ground system according to claim 3 or 4, wherein, The first module is used to collect the first positive voltage and the first positive current of the positive terminal of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative terminal of the load relative to the reference plane, calculate the first equivalent resistance value based on the first positive voltage and the first positive current, and calculate the second equivalent resistance value based on the first negative voltage and the first negative current. The second module is used to acquire the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane, calculate the third equivalent resistance value based on the second positive voltage and the second positive current, and calculate the fourth equivalent resistance value based on the second negative voltage and the second negative current.
6. The DC floating ground system according to claim 4 or 5, wherein, The first electrical parameters further include: the first positive voltage and the first positive current of the positive terminal of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative terminal of the load relative to the reference plane; The second electrical parameter further includes: the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, and the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane.
7. The DC floating ground system according to claim 6, wherein, The second module is further configured to determine whether the DC floating ground system has malfunctioned, based on the changes in the voltage and current of the load and the changes in the voltage and current of the DC power supply, when both the first resistance difference and the second resistance difference are within the predetermined resistance range.
8. The DC floating ground system according to claim 7, wherein, The second module is used to determine that the DC floating ground system has malfunctioned when at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases, provided that both the first resistance difference and the second resistance difference are within a predetermined resistance range.
9. The DC floating ground system according to any one of claims 1 to 8, further comprising: An information management platform is used to display fault information and alarm information received from the second module; The second module is also used to trigger an alarm when a fault is detected in the DC floating ground system, and to transmit the corresponding fault information and alarm information to the information management platform.
10. The DC floating ground system according to any one of claims 1 to 9, wherein, The second module is also used to control the activation of the protection device of the DC floating ground system when a fault occurs in the DC floating ground system and the duration of the fault reaches a predetermined duration.
11. A fault detection method for a DC floating ground system, wherein, The DC floating ground system includes: a DC power supply, a load, a first module, and a second module, wherein the DC power supply is not grounded, and the load is electrically connected to the DC power supply; The fault detection method includes: The first module acquires the first electrical parameters of the load and transmits the first electrical parameters to the second module; and The second module acquires the second electrical parameters of the DC power supply, and determines whether the DC floating ground system has malfunctioned based on the second electrical parameters and the first electrical parameters; The second module is connected to the first module to form a common reference plane. The level of the reference plane is not equal to the ground level. Both the first electrical parameter and the second electrical parameter are electrical parameters based on the reference plane.
12. The fault detection method according to claim 11, wherein, The second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, including: The second module calculates the parameter difference between the first electrical parameter and the second electrical parameter, and determines that the DC floating ground system has malfunctioned if the parameter difference is outside a predetermined range.
13. The fault detection method according to claim 12, wherein: The first electrical parameter includes: a first equivalent resistance of the positive terminal of the load relative to the reference plane and a second equivalent resistance of the negative terminal of the load relative to the reference plane; The second electrical parameter includes: the third equivalent resistance of the positive terminal of the DC power supply relative to the reference plane and the fourth equivalent resistance of the negative terminal of the DC power supply relative to the reference plane.
14. The fault detection method according to claim 13, wherein, The second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, including: The second module calculates the first resistance difference between the first equivalent resistance and the third equivalent resistance, and the second resistance difference between the second equivalent resistance and the fourth equivalent resistance; and If at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range, the DC floating ground system is determined to be faulty.
15. The fault detection method according to claim 13 or 14, wherein: The first module acquires the first electrical parameters of the load, including: the first module collects the first positive voltage and the first positive current of the positive terminal of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative terminal of the load relative to the reference plane, calculates the first equivalent resistance value based on the first positive voltage and the first positive current, and calculates the second equivalent resistance value based on the first negative voltage and the first negative current; The second module acquires the second electrical parameters of the DC power supply, including: the second module collects the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane, calculates the third equivalent resistance value based on the second positive voltage and the second positive current, and calculates the fourth equivalent resistance value based on the second negative voltage and the second negative current.
16. The fault detection method according to claim 14 or 15, wherein, The first electrical parameters further include: the first positive voltage and the first positive current of the positive terminal of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative terminal of the load relative to the reference plane; The second electrical parameter further includes: the second positive voltage and second positive current of the positive terminal of the DC power supply relative to the reference plane, and the second negative voltage and second negative current of the negative terminal of the DC power supply relative to the reference plane.
17. The fault detection method according to claim 16, wherein, The second module determines whether the DC floating ground system has malfunctioned based on the second electrical parameter and the first electrical parameter, and further includes: When both the first resistance difference and the second resistance difference are within the predetermined resistance range, the second module determines whether the DC floating ground system has malfunctioned based on the changes in the voltage and current of the load and the changes in the voltage and current of the DC power supply.
18. The fault detection method according to claim 17, wherein, When both the first resistance difference and the second resistance difference are within the predetermined resistance range, the second module determines whether a fault has occurred in the DC floating ground system based on changes in the voltage and current of the load and the voltage and current of the DC power supply, including: If, when both the first resistance difference and the second resistance difference are within a predetermined resistance range, the second module determines that the DC floating ground system has malfunctioned if at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage decreases, and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases, then the second module determines that the DC floating ground system has malfunctioned.
19. The fault detection method according to any one of claims 11 to 18, further comprising: The second module triggers an alarm when it determines that a fault has occurred in the DC floating ground system, and transmits the corresponding fault information and alarm information to the information management platform to display the fault information and alarm information.
20. The fault detection method according to any one of claims 11 to 19, further comprising: When the DC floating ground system malfunctions and the duration of the malfunction reaches a predetermined duration, the second module controls the activation of the protection device of the DC floating ground system.
21. A fault detection device for a DC floating ground system, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the fault detection method as described in any one of claims 11 to 20 based on instructions stored in the memory.
22. A DC floating ground system, comprising: The fault detection device as described in claim 21.
23. A computer-readable storage medium having stored thereon computer instructions that, when executed by a processor, implement the fault detection method as described in any one of claims 11 to 20.
24. A computer program comprising: Instructions, when executed by a processor, cause the processor to perform the fault detection method as described in any one of claims 11 to 20.