Direct current floating ground system, fault detection method and device, medium and program product

Abstract

The invention provides a direct-current floating ground system, a fault detection method and device, a medium and a program product. The direct-current floating ground system comprises a direct-current power supply which is not grounded; the load is electrically connected with the direct-current power supply; the first module is used for acquiring a first electrical parameter of a load and transmitting the first electrical parameter to the second module; the second module is used for acquiring a second electrical parameter of the direct-current power supply and determining whether the direct-current floating ground system breaks down or not according to the second electrical parameter and the first electrical parameter; wherein the second module and the first module are connected to form a common reference plane, the level of the reference plane is not equal to the grounding level, and the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

Description

Technical Field

[0001] The present disclosure relates to the field of direct current floating ground technology, and in particular to a direct current floating ground system, a fault detection method, a device, a medium and a program product. Background Art

[0002] In the related art, more and more high-voltage DC equipment such as DC charging piles and DC motors have appeared and served in industrial production and life, and DC systems have become more and more common. In the past, power supply systems were all grounded systems. When a person touched one of the wires in the system, a loop would be formed between the human body and the earth, and the current would pass through the human body, causing an electric shock accident. The DC floating ground system is not connected to the earth. When a person touches one of the wires, it will not form a loop with the earth or other conductors, and no electric shock accident will occur. However, due to the large number of lines and wide distribution in the DC floating ground system, arcing and poor insulation are prone to occur, which may cause faults such as DC power short circuit and equipment burning, and even threaten the personal safety of on-site maintenance personnel. In the related art, the DC floating ground system lacks fault detection function. Summary of the invention

[0003] A technical problem solved by the present disclosure is that in the related art, the DC floating ground system lacks a fault detection function.

[0004] According to one aspect of the present disclosure, a DC floating system is provided, comprising: a DC power supply, which is not grounded; a load, which is electrically connected to the DC power supply; a first module, which is used to obtain a first electrical parameter of the load and transmit the first electrical parameter to a second module; and a second module, which is used to obtain a second electrical parameter of the DC power supply and determine whether the DC floating system fails 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 the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

[0005] In some embodiments, the second module is used to calculate a parameter difference between the first electrical parameter and the second electrical parameter, and when the parameter difference is outside a predetermined range, it is determined that a fault occurs in the DC floating system.

[0006] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode of the DC power supply relative to the reference plane.

[0007] In some embodiments, the second module is used to calculate a first resistance difference between the first equivalent resistance and the third equivalent resistance, and a second resistance difference between the second equivalent resistance and the fourth equivalent resistance, and to determine that a fault occurs in the DC floating system when at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range.

[0008] In some embodiments, the first module is used to collect the first positive voltage and the first positive current of the positive electrode of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative electrode of the load relative to the reference plane, and calculate the first equivalent resistance based on the first positive voltage and the first positive current, and calculate the second equivalent resistance based on the first negative voltage and the first negative current; the second module is used to collect the second positive voltage and the second positive current of the positive electrode of the DC power supply relative to the reference plane, and the second negative voltage and the second negative current of the negative electrode of the DC power supply relative to the reference plane, and calculate the third equivalent resistance based on the second positive voltage and the second positive current, and calculate the fourth equivalent resistance based on the second negative voltage and the second negative current.

[0009] In some embodiments, the first electrical parameters also include: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; the second electrical parameters also include: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative electrode of the DC power supply relative to the reference plane.

[0010] In some embodiments, the second module is also used to determine whether the DC floating system is faulty based on changes in the voltage and current of the load and changes in the voltage and current of the DC power supply when the first resistance difference and the second resistance difference are both within the predetermined resistance range.

[0011] In some embodiments, the second module is used to determine that a fault occurs in the DC floating system 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 when both the first resistance difference and the second resistance difference are within a predetermined resistance range.

[0012] In some embodiments, the DC floating 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 used to trigger an alarm when it is determined that a fault occurs in the DC floating system, and transmit the corresponding fault information and alarm information to the information management platform.

[0013] In some embodiments, the second module is further used to control the activation of a protection device of the DC floating system when a fault occurs in the DC floating system and the duration of the fault reaches a predetermined duration.

[0014] According to another aspect of the present disclosure, a fault detection method for a DC floating system is provided, wherein the DC floating 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 obtains a first electrical parameter of the load and transmits the first electrical parameter to the second module; and the second module obtains a second electrical parameter of the DC power supply, and determines whether the DC floating system has a fault 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 the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

[0015] In some embodiments, the second module determines whether the DC floating system is faulty based on the second electrical parameter and the first electrical parameter, including: the second module calculates a parameter difference between the first electrical parameter and the second electrical parameter, and determines that the DC floating system is faulty when the parameter difference is outside a predetermined range.

[0016] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode of the DC power supply relative to the reference plane.

[0017] In some embodiments, the second module determines whether the DC floating system is faulty based on the second electrical parameter and the first electrical parameter, including: the second module calculates a first resistance difference between the first equivalent resistance and the third equivalent resistance, and a second resistance difference between the second equivalent resistance and the fourth equivalent resistance; and determines that the DC floating system is faulty when at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range.

[0018] In some embodiments, the first module acquires the first electrical parameter of the load, including: the first module acquires the first positive voltage and the first positive current of the positive electrode of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative electrode of the load relative to the reference plane, and calculates the first equivalent resistance based on the first positive voltage and the first positive current, and calculates the second equivalent resistance based on the first negative voltage and the first negative current; the second module acquires the second electrical parameter of the DC power supply, including: the second module acquires the second positive voltage and the second positive current of the positive electrode of the DC power supply relative to the reference plane, and the second negative voltage and the second negative current of the negative electrode of the DC power supply relative to the reference plane, and calculates the third equivalent resistance based on the second positive voltage and the second positive current, and calculates the fourth equivalent resistance based on the second negative voltage and the second negative current.

[0019] In some embodiments, the first electrical parameters also include: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; the second electrical parameters also include: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative electrode of the DC power supply relative to the reference plane.

[0020] In some embodiments, the second module determines whether the DC floating system is faulty based on the second electrical parameter and the first electrical parameter, and also includes: 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 system is faulty based on changes in the voltage and current of the load and changes in the voltage and current of the DC power supply.

[0021] In some embodiments, the second module determines whether the DC floating system fails based on changes in voltage and current of the load and changes in voltage and current of the DC power supply when the first resistance difference and the second resistance difference are both within the predetermined resistance range, including: when the first resistance difference and the second resistance difference are both 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 drops and at least one of the first positive current, the first negative current, the second positive current and the second negative current increases, the second module determines that the DC floating system fails.

[0022] In some embodiments, the fault detection method further includes: the second module triggers an alarm when determining that a fault occurs in the DC floating system, and transmits corresponding fault information and alarm information to an information management platform to display the fault information and the alarm information.

[0023] In some embodiments, the fault detection method further includes: when a fault occurs in the DC floating system and the duration of the fault reaches a predetermined duration, the second module controls to start a protection device of the DC floating system.

[0024] According to another aspect of the present disclosure, a fault detection device for a DC floating ground system is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the aforementioned fault detection method based on instructions stored in the memory.

[0025] According to another aspect of the present disclosure, a DC floating system is provided, comprising: the fault detection device as described above.

[0026] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored. When the computer instructions are executed by a processor, the fault detection method as described above is implemented.

[0027] According to another aspect of the present disclosure, a computer program product is provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, the fault detection method as described above is implemented.

[0028] In the above system, electrical parameters based on a common reference plane are acquired by the first module and the second module, and whether a DC floating system fails is determined based on these electrical parameters, thereby providing a fault detection function in the DC floating system and realizing fault detection of the DC floating system.

[0029] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0032] Figure 1 is a block diagram schematically showing a structure of a DC floating ground system according to some embodiments of the present disclosure;

[0033] Figure 2 is a structural block diagram schematically showing a DC floating ground system according to other embodiments of the present disclosure;

[0034] Figure 3 is a flow chart showing a fault detection method for a DC floating ground system according to some embodiments of the present disclosure;

[0035] Figure 4 is a flow chart showing a fault detection method for a DC floating ground system according to other embodiments of the present disclosure;

[0036] Figure 5 is a structural block diagram schematically showing a fault detection device for a DC floating system according to some embodiments of the present disclosure;

[0037] Figure 6 It is a structural block diagram schematically showing a fault detection device for a DC floating system according to other embodiments of the present disclosure. DETAILED DESCRIPTION

[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 the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0039] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, 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 limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] Figure 1 FIG. 1 is a block diagram schematically showing a DC floating ground system according to some embodiments of the present disclosure. Figure 1 As shown, the DC floating 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 .

[0045] The DC power source 110 is not grounded. The load 120 is electrically connected to the DC power source 110. For example, the positive electrode of the load 120 is electrically connected to the positive electrode DC+ of the DC power source 110, and the negative electrode of the load 120 is electrically connected to the negative electrode DC- of the DC power source 110.

[0046] The first module 131 can be installed near the load 120. The second module 132 can be installed on the DC power supply 110, or can also be installed near the DC power supply 110. The first module and the second module can interact in real time through wireless communication or wired communication. The second module 132 is connected to the first module 131 to form a common reference plane, and the level of the reference plane is not equal to the ground level.

[0047] Here, the reference plane formed by the connection between 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 level of the reference plane is not equal to the ground level, that is, the reference plane is not the earth. The reference plane is used as a basic plane for obtaining electrical parameters. That is, when obtaining electrical parameters, the collection or calculation of the electrical parameters is based on the reference plane, which will be described in detail later.

[0048] The first module 131 is used to obtain a first electrical parameter of the load and transmit the first electrical parameter to the second module.

[0049] For example, a DC floating system may include one or more loads, each of which is connected to a first module. Accordingly, the DC floating system may also include one or more first modules, each of which is used to obtain a first electrical parameter of a corresponding load and transmit the first electrical parameter of the corresponding load to a second module. Since each load branch can be installed with a first module, it is convenient to locate the fault point more accurately.

[0050] The second module 132 is used to obtain a second electrical parameter of the DC power supply, and determine whether a fault occurs in the DC floating system according to the second electrical parameter and the first electrical parameter.

[0051] Here, the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane. In other words, the first electrical parameter and the second electrical parameter are electrical parameters obtained by taking the reference plane as the base plane of the electrical parameters.

[0052] So far, a DC floating system according to some embodiments of the present disclosure is provided. The DC floating system includes: a DC power supply, which is not grounded; a load, which is electrically connected to the DC power supply; a first module, which is used to obtain a first electrical parameter of the load and transmit the first electrical parameter to a second module; and a second module, which is used to obtain a second electrical parameter of the DC power supply and determine whether the DC floating system has a fault according to 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 the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane. In the system, electrical parameters based on the common reference plane are obtained by the first module and the second module, and whether the DC floating system has a fault is determined based on these electrical parameters, thereby providing a fault detection function in the DC floating system and realizing fault detection of the DC floating system. In the case where the DC floating system is not grounded, the plane formed by connecting the second module to the first module is used as a common reference plane, which facilitates the collection and calculation of electrical parameters, and thus facilitates the implementation of fault detection. Furthermore, since the DC floating ground system is not connected to the ground, if someone touches any power line in the system, there will be no electric shock accident, thus improving the safety of the system.

[0053] 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 when the parameter difference is outside a predetermined range, it is determined that the DC floating system has a fault. This achieves fault detection of the DC floating system and improves the safety and reliability of system operation.

[0054] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode 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 more comprehensively reflect the fault condition of the system. Therefore, using the equivalent resistance for fault detection can improve the accuracy of fault detection.

[0055] For example, the second module 132 is used to calculate 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 determine that the DC floating system has a fault when at least one of the first resistance difference and the second resistance difference is outside the predetermined resistance range. In this embodiment, the difference between the equivalent resistance of the load and the equivalent resistance of the DC power supply is used to determine whether a fault has occurred, which can improve the accuracy of fault detection.

[0056] It should be noted here that, in theory, when the first equivalent resistance is equal to the third equivalent resistance, and the second equivalent resistance is equal to the fourth equivalent resistance, the DC floating system has no fault. However, because the first module actually adds the influence of the line impedance in the loop during calculation, the corresponding equivalent resistances of the DC power supply end and the load end will not be completely equal. At this time, it can be determined whether the difference between the corresponding equivalent resistances is outside an allowable predetermined resistance range. If the difference is outside the predetermined resistance range, it is determined that the DC floating system has a fault.

[0057] For example, the predetermined resistance range may be [-50Ω, 50Ω]. Of course, the predetermined resistance range is only exemplary, and the scope of the present disclosure is not limited to the specific values ​​of the predetermined resistance range. Those skilled in the art will appreciate that the predetermined resistance range may be set according to actual needs.

[0058] The above describes a method for determining whether a fault occurs by using an equivalent resistance value. The following describes the origin of the above equivalent resistance value.

[0059] For example, the first module 131 is used to collect the first positive voltage and the first positive current of the positive electrode of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative electrode of the load relative to the reference plane, and calculate the first equivalent resistance based on the first positive voltage and the first positive current, and calculate the second equivalent resistance based on the first negative voltage and the first negative current. In this way, the equivalent resistance of the load end can be obtained, which is convenient for subsequent use of the equivalent resistance to determine whether a fault occurs.

[0060] In the above embodiments, the first positive voltage is the voltage of the positive electrode of the load relative to the reference plane, the first positive current is the current flowing through the positive electrode of the load under the first positive voltage, the first negative voltage is the voltage of the negative electrode of the load relative to the reference plane, and the first negative current is the current flowing through the negative electrode 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.

[0061] For example, the second module 132 is used to collect the second positive voltage and the second positive current of the positive electrode of the DC power supply relative to the reference plane, the second negative voltage and the second negative current of the negative electrode of the DC power supply relative to the reference plane, calculate the third equivalent resistance based on the second positive voltage and the second positive current, and calculate the fourth equivalent resistance based on the second negative voltage and the second negative current. In this way, the equivalent resistance of the DC power supply terminal can be obtained, which is convenient for subsequent use of the equivalent resistance to determine whether a fault occurs.

[0062] In the above embodiment, the second positive voltage is the voltage of the positive electrode of the DC power supply relative to the reference plane, the second positive current is the current flowing through the positive electrode of the DC power supply under the second positive voltage, the second negative voltage is the voltage of the negative electrode of the DC power supply relative to the reference plane, and the second negative current is the current flowing through the negative electrode 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.

[0063] In some embodiments, the first electrical parameter may also include: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; the second electrical parameter may also include: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, a second negative voltage and a second negative current of the negative electrode of the DC power supply relative to the reference plane. In other words, in addition to the equivalent resistance, parameters such as the voltage and current of the load and the DC power supply can also be used as electrical parameters, so that the conditions of multiple electrical parameters can be comprehensively considered, thereby further improving the accuracy of fault detection of the DC floating system.

[0064] In some embodiments, the second module 132 is further used to determine whether the DC floating system has a fault based on the change of the voltage and current of the load and the change of 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. In this embodiment, in addition to the equivalent resistance, the change of electrical parameters such as voltage and current is also combined to determine whether the system has a fault, which can improve the accuracy of fault detection of the DC floating system.

[0065] For example, the first module 131 may also be used to obtain a change in a first electrical parameter, and transmit the change in the first electrical parameter to the second module 132. For example, the second module 132 may also be used to obtain a change in a second electrical parameter, and determine whether a fault occurs in the DC floating system based on the change in the first electrical parameter and the change in the second electrical parameter.

[0066] It should be noted that the change of the electrical parameter here refers to the change of the electrical parameter over time. The value of the electrical parameter at the previous moment can be compared with the value of the electrical parameter at the current moment to determine whether the electrical parameter increases or decreases, that is, to obtain the change of the electrical parameter. The electrical parameter can be the voltage, current or equivalent resistance value as mentioned above.

[0067] For example, the second module 132 can be used to determine that a fault has occurred in the DC floating system if at least one of the first positive voltage, the first negative voltage, the second positive voltage, and the second negative voltage drops, and at least one of the first positive current, the first negative current, the second positive current, and the second negative current increases when both the first resistance difference and the second resistance difference are within a predetermined resistance range.

[0068] That is, when the equivalent resistance meets the predetermined resistance range, it can be determined whether the DC floating system has a fault in combination with the changes in voltage and current. When 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) drops 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) rises, it is determined that the DC floating system has a fault; otherwise, it is determined that the DC floating system has not a fault.

[0069] For example, when insulation failure occurs (for example, a wire is grounded), the system will experience a voltage drop and a significant current increase due to the short circuit. Therefore, when the equivalent resistance value meets the predetermined resistance range, it is possible to determine whether a fault has occurred by detecting the voltage change and the current change.

[0070] Therefore, in the above embodiment, the equivalent resistance, voltage and current are comprehensively considered in fault detection, which can improve the accuracy of fault detection.

[0071] Figure 2 Schematically shows a structural block diagram of a DC floating ground system according to some other embodiments of the present disclosure. Figure 2 As shown, the DC floating system includes: a DC power supply 110 , a load 120 , a first module 131 and a second module 132 .

[0072] like Figure 2As shown, the DC floating system may also include an information management platform (also referred to as an information management system) 140. For example, the information management system may be an IEMS (Informationized Energy Management System). IEMS is based on energy informatization technology to build a distributed, point-to-point, collaborative grid-based energy information hierarchical architecture, including an energy equipment layer, a data link layer, an information control layer, an information management layer, and a commercial user layer, to achieve a lightweight and freely accessible energy Internet system.

[0073] The information management platform 140 is used to display the 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 it is determined that a fault occurs in the DC floating system, and transmit the corresponding fault information and alarm information to the information management platform. This makes it convenient for the staff to remotely view the operation status and abnormal alarm of the DC floating system on the information management platform.

[0074] For example, an alarm unit is provided in the second module, and when it is determined that a fault occurs in the DC floating ground system, the alarm unit is triggered to alarm.

[0075] For example, the second module can upload the analysis results to the gateway via wireless transmission, and the gateway can then upload them to the IEMS information management platform, where the operating status and abnormal alarms can be viewed remotely.

[0076] In some embodiments, the second module 132 can also be used to control the activation of the protection device of the DC floating system when a fault occurs in the DC floating system and the duration of the fault reaches a predetermined duration. This can protect the system in the event of a system fault and improve the safety and reliability of the system.

[0077] For example, the above-mentioned predetermined duration can be from a few seconds to 1 minute. Of course, the scope of the present disclosure is not limited to the specific value of the predetermined duration. The predetermined duration can be set according to actual conditions or actual needs.

[0078] So far, some embodiments of the DC floating ground system are described in detail. Unlike ordinary power systems, this system is not connected to the ground and belongs to a floating ground system. The human body will not get an electric shock unless it touches the positive and negative poles of the power supply at the same time. For example, if only the positive pole or only the negative pole is touched, since the system is a floating ground system, no current loop will be formed between the human body and the ground, so the human body will not get an electric shock. In this system, the load can include all DC power-consuming devices. The first module and the second module are connected to form a common reference plane, which is not the ground. During the operation of the system, the two modules collect data from the power supply end and the load end in real time, and calculate the equivalent resistance relative to the reference plane. The two modules interact in real time through wireless communication. After data comparison and analysis, the second module uploads the analysis results to the gateway through wireless transmission, and the gateway uploads them to the IEMS information management platform. The operation status and abnormal alarms can be viewed remotely on the platform.

[0079] Before an arc or insulation failure occurs, the system is in a stable operating state. When a difference appears in the data and the difference exceeds a predetermined range, it indicates that the system state has changed. The change in the system will affect the change in system impedance. Under the premise of excluding the change in the load working mode, it can be determined whether an arc occurs or insulation fails based on the change in specific data.

[0080] It should be noted that in some embodiments, the short-range wireless communication frequency of the system can be 433 MHz, 470 MHz to 510 MHz, or 2.4 GHz. The scope of the present disclosure is not limited to the specific value of the wireless communication frequency, and the wireless communication frequency can be set according to actual needs.

[0081] Figure 3 1 is a flow chart showing a fault detection method for a DC floating system according to some embodiments of the present disclosure. The DC floating 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. Figure 3 As shown, the fault detection method includes steps S302 to S304.

[0082] In step S302 , the first module obtains a first electrical parameter of the load, and transmits the first electrical parameter to the second module.

[0083] In step S304, the second module obtains a second electrical parameter of the DC power supply, and determines whether a fault occurs in the DC floating system according to the second electrical parameter and the first electrical parameter.

[0084] The second module is connected to the first module to form a common reference plane, and the level of the reference plane is not equal to the ground level. The first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

[0085] So far, a fault detection method for a DC floating system according to some embodiments of the present disclosure is provided. The fault detection method includes: a first module obtains a first electrical parameter of a load and transmits the first electrical parameter to a second module; and a second module obtains a second electrical parameter of a DC power supply, and determines whether a fault occurs in the DC floating system according to 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 the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane. In this method, electrical parameters based on a common reference plane are obtained by the first module and the second module, and whether a fault occurs in the DC floating system is determined based on these electrical parameters, thereby providing a fault detection function in the DC floating system and realizing fault detection of the DC floating system. Moreover, when the DC floating system is not connected to the ground, the plane formed by connecting the second module to the first module is used as a common reference plane, which facilitates the collection and calculation of electrical parameters, and thus facilitates the implementation of fault detection.

[0086] In some embodiments, the second module determines whether the DC floating system has a fault according to 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 system has a fault when the parameter difference is outside a predetermined range. In this way, fault detection of the DC floating system is achieved, and the safety and reliability of system operation are improved.

[0087] In some embodiments, the first electrical parameter includes: a first equivalent resistance of the positive electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; the second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode 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 more comprehensively reflect the fault condition of the system. Therefore, using the equivalent resistance for fault detection can improve the accuracy of fault detection.

[0088] In some embodiments, the second module determines whether a fault occurs in the DC floating system according to the second electrical parameter and the first electrical parameter, including: the second module calculates a first resistance difference between the first equivalent resistance and the third equivalent resistance, and a second resistance difference between the second equivalent resistance and the fourth equivalent resistance; and determines that a fault occurs in the DC floating system when at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range. In this embodiment, the difference between the equivalent resistance of the load and the equivalent resistance of the DC power supply is used to determine whether a fault occurs, which can improve the accuracy of fault detection.

[0089] In some embodiments, the first module obtains the first electrical parameter of the load, including: the first module collects the first positive voltage and the first positive current of the positive electrode of the load relative to the reference plane, and the first negative voltage and the first negative current of the negative electrode of the load relative to the reference plane, calculates the first equivalent resistance based on the first positive voltage and the first positive current, and calculates the second equivalent resistance based on the first negative voltage and the first negative current. In this way, the equivalent resistance of the load end can be obtained, which is convenient for subsequent use of the equivalent resistance to determine whether a fault occurs.

[0090] In some embodiments, the second module obtains the second electrical parameter of the DC power supply, including: the second module collects the second positive voltage and the second positive current of the positive electrode of the DC power supply relative to the reference plane, the second negative voltage and the second negative current of the negative electrode of the DC power supply relative to the reference plane, calculates the third equivalent resistance based on the second positive voltage and the second positive current, and calculates the fourth equivalent resistance based on the second negative voltage and the second negative current. In this way, the equivalent resistance of the DC power supply terminal can be obtained, which is convenient for subsequent use of the equivalent resistance to determine whether a fault occurs.

[0091] In some embodiments, the first electrical parameter further includes: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; the second electrical parameter further includes: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative electrode of the DC power supply 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, so that the conditions of multiple electrical parameters can be comprehensively considered, thereby further improving the accuracy of fault detection of the DC floating system.

[0092] In some embodiments, the second module determines whether the DC floating system is faulty according to the second electrical parameter and the first electrical parameter, and further includes: the second module determines whether the DC floating system is faulty 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 the first resistance difference and the second resistance difference are both within a predetermined resistance range. In this embodiment, in addition to the equivalent resistance, the changes in electrical parameters such as voltage and current are also combined to determine whether the system is faulty, which can improve the accuracy of fault detection of the DC floating system.

[0093] In some embodiments, when the first resistance difference and the second resistance difference are both within a predetermined resistance range, the second module determines whether the DC floating system is faulty 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, including: when the first resistance difference and the second resistance difference are both 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 drops, 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 DC floating system is determined to be faulty. In this embodiment, the equivalent resistance, voltage and current are comprehensively considered in fault detection, which can improve the accuracy of fault detection.

[0094] In some embodiments, the fault detection method may further include: the second module triggers an alarm when it is determined that a fault occurs 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. This makes it convenient for staff to remotely view the operation status and abnormal alarms of the DC floating ground system on the information management platform and other platforms.

[0095] In some embodiments, the fault detection method may further include: the second module controls the activation of a 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 system fault and improve the safety and reliability of the system.

[0096] In some embodiments of the present disclosure, the first module (online arc and insulation detection slave module) and the second module (online arc and insulation detection master module) are integrated in a DC floating system, the second module can be installed at the DC power supply end, the first module can be installed near the load end, and the two modules are connected to form a reference plane. In the DC floating system, the two modules respectively collect and calculate the equivalent resistance relative to the reference plane, and the two modules interact and compare and analyze through wireless communication, which can monitor the real-time operation status of the entire system and reduce the cumbersomeness of wiring. When a DC arc or insulation failure occurs at a certain point in the system, the equivalent resistance value of the power supply end and the load end relative to the reference plane will change. The data interacted by the two modules can reflect the change of state, thereby judging the system fault, and then alarming. When the fault continues, the power supply is disconnected to protect the circuit system, and the module uploads the data to the IEMS information management system through wireless transmission, and the data and operation status can be viewed remotely on the system.

[0097] The above ungrounded system is conducive to creating a safer DC system, reducing the probability of electric shock by 50%. Online real-time monitoring can detect system abnormalities in a timely and rapid manner, reduce the occurrence of accidents, and thus improve the safety and reliability of DC system operation.

[0098] Figure 4 FIG. 1 is a flow chart showing a fault detection method for a DC floating system according to other embodiments of the present disclosure. Figure 4 As shown, the fault detection method includes steps S402 to S420, wherein steps S402 to S404 are performed by the first module, and steps S406 to S420 are performed by the second module.

[0099] In step S402, voltage is collected. That is, the first module collects a first positive voltage of the positive electrode of the load relative to the reference plane and a first negative voltage of the negative electrode of the load relative to the reference plane. In addition, the first module can also collect a first positive current of the positive electrode of the load and a first negative current of the negative electrode of the load.

[0100] In step S404, the equivalent resistance is calculated. That is, the first module calculates the first equivalent resistance of the positive electrode of the load and the second equivalent resistance of the negative electrode of the load based on the collected parameters such as the voltage and current of the load. In addition, the first module transmits the data such as the equivalent resistance, voltage and current to the second module.

[0101] In step S406, voltage is collected. That is, the second module collects a second positive voltage of the positive electrode of the DC power supply relative to the reference plane and a second negative voltage of the negative electrode of the DC power supply relative to the reference plane. In addition, the second module can also collect a second positive current of the positive electrode of the DC power supply and a second negative current of the negative electrode of the DC power supply.

[0102] In step S408, the equivalent resistance is calculated. That is, the second module calculates the third equivalent resistance of the positive electrode of the DC power supply and the fourth equivalent resistance of the negative electrode of the DC power supply based on the collected parameters such as the voltage and current of the DC power supply.

[0103] In step S410, the data is analyzed, that is, the second module analyzes data such as equivalent resistance, voltage and current of the load and the DC power supply.

[0104] In step S412, it is determined whether the data is normal. If so, the process proceeds to step S414; otherwise, the process proceeds to step S416.

[0105] In step S414, the information management platform is uploaded. For example, if the data is normal, the normal data is uploaded to the information management platform.

[0106] In step S416, an alarm is triggered. For example, an alarm unit is provided in the second module, and an alarm is triggered in the case of data abnormality. Furthermore, the second module can also upload the alarm information and fault information to the information management platform.

[0107] In step S418, it is determined whether the anomaly persists. If so, the process proceeds to step S420; otherwise, the process proceeds to step S414, for example, if the anomaly is not persistent, the information on the end of the anomaly is uploaded to the information management platform.

[0108] In step S420, the protection device is started, that is, when the abnormality persists, the protection device is started to protect the DC floating system.

[0109] So far, a fault detection method for a DC floating ground system according to other embodiments of the present disclosure is provided. In this method, when the system operates normally, the second module obtains the voltage, current and equivalent resistance value of the power supply end, and the first module obtains the voltage, current and equivalent resistance value of the load end. The first module transmits the data collected and calculated on the load side to the second module, and the second module compares and analyzes its own data with the received data, and uploads the analysis results to the information management platform. When a fault such as a DC arc is generated or insulation failure occurs, the data of the second module and the data received from the first module will differ by more than a predetermined range. By analyzing the data changes, it can be determined that a fault abnormality has occurred in the system. The second module can transmit the abnormal data and abnormal flag to the gateway through wireless communication, and upload them to the information management platform.

[0110] Here, abnormal data refers to data that deviates from the stable state of the system. The module can further analyze the abnormal data and determine whether the cause is a change in load operation mode, load failure, DC arc in the circuit, or insulation failure, and mark it with an abnormal flag.

[0111] Figure 5 Schematically shows a block diagram 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:

[0112] The memory 510 can be a disk, a flash memory, or any other non-volatile storage medium. The memory is used to store Figure 3 and / or Figure 4 The instructions in the corresponding embodiment.

[0113] The processor 520 is coupled to the memory 510 and can be implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 520 is used to execute instructions stored in the memory to implement fault detection of the DC floating system.

[0114] In some embodiments, it is also possible to Figure 6 As shown, the fault detection device 600 includes a memory 610 and a processor 620. The processor 620 is coupled to the memory 610 via a BUS 630. The fault detection device 600 can also be connected to an external storage device 650 via a storage interface 640 to call external data, and can 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.

[0115] In this embodiment, the fault detection of the DC floating system is realized by storing data instructions in the memory and processing the instructions by the processor.

[0116] In some embodiments of the present disclosure, a DC floating ground system is further provided, comprising: a fault detection device as described above (for example, Figure 5 or Figure 6 Fault detection device shown).

[0117] In some embodiments, the present disclosure further provides a computer-readable storage medium (eg, a non-transitory computer-readable storage medium) having computer program instructions stored thereon, which when executed by a processor implements Figure 3 and / or Figure 4 The steps of the method in the corresponding embodiment. Those skilled in the art should understand that the embodiments of the present disclosure can be provided as methods, devices, or computer program products. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] In some embodiments of the present disclosure, a computer program product is further provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, the fault detection method as described above is implemented.

[0122] In some embodiments of the present disclosure, a computer program is further provided, comprising: instructions, which, when executed by a processor, cause the processor to execute the fault detection method as described above.

[0123] So far, the present disclosure has been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0124] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A DC floating ground system, comprising: A DC power supply, wherein the DC power supply is not grounded; a load, electrically connected to the DC power supply; A first module, configured to obtain a first electrical parameter of the load and transmit the first electrical parameter to a second module; and The second module is used to obtain a second electrical parameter of the DC power supply, and determine whether the DC floating system fails according to the second electrical parameter and the first electrical parameter; 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 the first electrical parameter and the second electrical parameter are both 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 a parameter difference between the first electrical parameter and the second electrical parameter, and determine that a fault occurs in the DC floating system when the parameter difference is outside a predetermined range.

3. The DC floating ground system according to claim 2, wherein: The first electrical parameter includes: a first equivalent resistance of the positive electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; The second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode 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 and the third equivalent resistance, and a second resistance difference between the second equivalent resistance and the fourth equivalent resistance, and to determine that a fault occurs in the DC floating system when at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range.

5. The DC floating ground system according to claim 3 or 4, wherein: The first module is used to collect a first positive electrode voltage and a first positive electrode current of the positive electrode of the load relative to the reference plane, and a first negative electrode voltage and a first negative electrode current of the negative electrode of the load relative to the reference plane, and calculate the first equivalent resistance based on the first positive electrode voltage and the first positive electrode current, and calculate the second equivalent resistance based on the first negative electrode voltage and the first negative electrode current; The second module is used to collect the second positive electrode voltage and the second positive electrode current of the positive electrode of the DC power supply relative to the reference plane, and the second negative electrode voltage and the second negative electrode current of the negative electrode of the DC power supply relative to the reference plane, and calculate the third equivalent resistance based on the second positive electrode voltage and the second positive electrode current, and calculate the fourth equivalent resistance based on the second negative electrode voltage and the second negative electrode current.

6. The DC floating ground system according to claim 4, wherein: The first electrical parameter further includes: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; The second electrical parameter also includes: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative electrode 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 also used to determine whether the DC floating system fails based on changes in the voltage and current of the load and changes in the voltage and current of the DC power supply when the first resistance difference and the second resistance difference are both within the predetermined resistance range.

8. The DC floating ground system according to claim 7, wherein: The second module is used to determine that a fault occurs in the DC floating system 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 when both the first resistance difference and the second resistance difference are within a predetermined resistance range.

9. The DC floating ground system according to claim 1, further comprising: An information management platform, used for displaying the fault information and alarm information received from the second module; The second module is further configured to trigger an alarm when it is determined that a fault occurs in the DC floating system, and transmit corresponding fault information and alarm information to the information management platform.

10. The DC floating ground system according to claim 1, wherein: The second module is also used for controlling and starting a protection device of the DC floating system when a fault occurs in the DC floating 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 system comprises: 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 comprises: The first module acquires a first electrical parameter of the load, and transmits the first electrical parameter to the second module; and The second module obtains a second electrical parameter of the DC power supply, and determines whether the DC floating system fails according to the second electrical parameter and the first electrical parameter; 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 the first electrical parameter and the second electrical parameter are both electrical parameters based on the reference plane.

12. The fault detection method according to claim 11, wherein: The second module determines whether a fault occurs in the DC floating system according to the second electrical parameter and the first electrical parameter, including: The second module calculates a parameter difference between the first electrical parameter and the second electrical parameter, and determines that a fault occurs in the DC floating system when 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 electrode of the load relative to the reference plane and a second equivalent resistance of the negative electrode of the load relative to the reference plane; The second electrical parameter includes: a third equivalent resistance of the positive electrode of the DC power supply relative to the reference plane and a fourth equivalent resistance of the negative electrode 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 a fault occurs in the DC floating system according to the second electrical parameter and the first electrical parameter, including: The second module calculates a first resistance difference between the first equivalent resistance and the third equivalent resistance, and a second resistance difference between the second equivalent resistance and the fourth equivalent resistance; and When at least one of the first resistance difference and the second resistance difference is outside a predetermined resistance range, it is determined that a fault occurs in the DC floating system.

15. The fault detection method according to claim 13 or 14, wherein: The first module acquires the first electrical parameter of the load, including: the first module collects a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane, calculates the first equivalent resistance based on the first positive voltage and the first positive current, and calculates the second equivalent resistance based on the first negative voltage and the first negative current; The second module obtains the second electrical parameter of the DC power supply, including: the second module collects the second positive electrode voltage and the second positive electrode current of the positive electrode of the DC power supply relative to the reference plane, and the second negative electrode voltage and the second negative electrode current of the negative electrode of the DC power supply relative to the reference plane, and calculates the third equivalent resistance based on the second positive electrode voltage and the second positive electrode current, and calculates the fourth equivalent resistance based on the second negative electrode voltage and the second negative electrode current.

16. The fault detection method according to claim 14, wherein: The first electrical parameter further includes: a first positive voltage and a first positive current of the positive electrode of the load relative to the reference plane, and a first negative voltage and a first negative current of the negative electrode of the load relative to the reference plane; The second electrical parameter also includes: a second positive voltage and a second positive current of the positive electrode of the DC power supply relative to the reference plane, and a second negative voltage and a second negative current of the negative electrode 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 system fails according to the second electrical parameter and the first electrical parameter, and further includes: The second module determines whether the DC floating system fails based on changes in voltage and current of the load and changes in 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.

18. The fault detection method according to claim 17, wherein: The second module determines whether the DC floating system fails based on changes in the voltage and current of the load and 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, including: The second module determines that a fault occurs in the DC floating system if, when the first resistance difference and the second resistance difference are both 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.

19. The fault detection method according to claim 11, further comprising: The second module triggers an alarm when determining that a fault occurs in the DC floating system, and transmits corresponding fault information and alarm information to an information management platform to display the fault information and the alarm information.

20. The fault detection method according to claim 11, further comprising: The second module controls to start the protection device of the DC floating system when a fault occurs in the DC floating system and the duration of the fault reaches a predetermined duration.

21. A fault detection device for a DC floating system, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the fault detection method according to any one of claims 11 to 20 based on instructions stored in the memory.

22. A DC floating ground system, comprising: A fault detection device as claimed in claim 21.

23. A computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the fault detection method according to any one of claims 11 to 20.

24. A computer program product, comprising a computer program or instructions, which implements the fault detection method according to any one of claims 11 to 20 when executed by a processor.

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