Method, device and system for determining grounding fault type of UPS power supply

Abstract

The present application provides a method, an apparatus, and a system for determining the type of grounding fault of a UPS power supply. The method includes: obtaining the load current values when the potential of the neutral line is equal to zero and no compensation resistor is connected, obtaining the load current values when the potential of the neutral line is equal to zero and a compensation resistor is connected, obtaining the load current values when the potential of the live line is equal to zero and no compensation resistor is connected, and obtaining the load current values of each load when the potential of the live line is equal to zero and a compensation resistor is connected; determining whether the load current values of each load change before and after connecting the compensation resistor when the potential of the neutral line is equal to zero, or determining whether the load current values flowing through each load change before and after connecting the compensation resistor when the potential of the live line is equal to zero; determining whether there is a grounding fault in each load or whether there is a grounding fault in the UPS power supply according to the judgment results corresponding to each load. This method solves the problem in the prior art that when using the capacitance or inductance compensation differential current method, it is easy to have an insignificant change in the current flowing through the load before and after compensation.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and more particularly, to a method for determining the type of grounding fault of a UPS power supply, a determining device, a computer-readable storage medium, a processor, and a determining system. Background Art

[0002] A UPS power supply, i.e., an uninterruptible power supply, is a power supply containing an energy storage device that mainly provides a constant voltage and constant frequency uninterruptible power supply for important loads through an inverter. The UPS system can usually be set into two modes: a grounding system and an ungrounded system according to needs. However, to improve the power supply reliability, the ungrounded system is mostly adopted on-site. The capacitive current to the ground of the ungrounded system is small and related to the length of the load cable. During normal operation, the voltage UL of the live wire of the UPS output terminal to the ground and the voltage UN of the neutral wire to the ground are both 110V. If a single-point grounding fault occurs, UL = 220V (or UN = 220V) or UL = 0V (or UN = 0V), which reduces the power supply reliability. The grounding point needs to be removed in time. However, due to many instrument loads, it is very difficult to determine which load or the UPS body is grounded.

[0003] Currently, in the prior art, there are three methods for detecting UPS grounding faults, which are specifically as follows:

[0004] 1. The branch-disconnecting method: When a grounding fault occurs in the UPS system, the branch-disconnecting method can be used for judgment. When UL and UN are both 110V after a certain branch is disconnected, it is determined that the branch is grounded. When UL and UN voltages do not return to normal after all branches are disconnected one by one, it is determined that the UPS body is grounded.

[0005] 2. The direct differential current method: When a grounding fault occurs in the UPS system, the differential current value of the non-grounded load branch is zero, and a differential current value is formed in the grounded load branch due to the capacitive current of the system flowing through the grounding point, that is, the load branch with differential current is the grounded load. When the differential current values of all branches remain unchanged and are all zero, it is determined that the UPS body is grounded.

[0006] 3. The capacitive or inductive compensation differential current method: On the basis of the DC differential current method, if UL = 0 (or UN = 0), a capacitor or an inductor is connected in parallel between the neutral wire N (or the live wire L) and the ground. When a grounding fault occurs in the UPS system, the differential current value of the non-grounded load branch remains zero and does not change. The differential current value of the grounded load branch becomes larger due to the capacitive current of the system flowing through the grounding point and the capacitive current or inductive current of the parallel-connected capacitor or inductor. Therefore, it can be judged by comparing the change in the differential current of the load branch before and after connecting the capacitor or inductor. The load branch with an unchanged differential current value is the non-grounded load, and the load branch with a large change in the differential current value is the grounded load. If the differential current values of all branches remain unchanged, it is determined that the UPS body is grounded.

[0007] The disadvantages of the above three methods for judging UPS grounding faults are as follows:

[0008] 1. Problems existing in judging UPS grounding faults by the loop switching method:

[0009] ① It is necessary to hand over the UPS load. During the loop switching process, the corresponding load branch will experience a short power outage. Since the loads carried by the UPS are all important loads, it is difficult and time-consuming to hand them over, and it is extremely easy to cause tripping.

[0010] ② If there are many branches carried by the UPS system, it will take a long time to perform loop switching one by one.

[0011] 2. Problems existing in judging UPS grounding faults by the direct differential current method: The differential current value is actually the value of the system capacitive current flowing through the grounding point. However, this current is small and requires a high-precision clamp-on ammeter for detection. Moreover, due to its small value, it is greatly affected by the outside world, the measurement is inaccurate, and it is prone to misjudgment.

[0012] 3. Problems existing in judging UPS grounding faults by the capacitive or inductive compensation differential current method: It is impossible to predict whether the grounding fault load branch is a capacitive load or an inductive load. Since the capacitive current and the inductive current cancel each other out, after connecting a capacitor or an inductor in parallel, the differential current value may be fully compensated or over-compensated, resulting in an inability to accurately grasp the change situation of the differential current value, and thus causing misjudgment. In addition, when connecting a capacitor or an inductor in parallel to compensate the differential current value, the operation is carried out while the power is on, and there is a risk of electric shock.

[0013] The above information disclosed in the background art section is only used to enhance the understanding of the background art of the technology described in this article. Therefore, the background art may contain certain information that does not form the prior art known in the country for those skilled in the art. Summary of the Invention

[0014] The main purpose of this application is to provide a method and device for determining the type of UPS power supply grounding fault, a computer-readable storage medium, a processor, and a determination system, so as to solve the problem that the change in the current flowing through the load before and after compensation is not obvious when using the capacitive or inductive compensation differential current method in the prior art.

[0015] According to one aspect of the embodiments of the present application, a method for determining the type of grounding fault of a UPS power supply is provided. The UPS power supply grounding fault monitoring device includes a UPS power supply, multiple loads, a switch, and a compensation resistor. The UPS power supply includes a live wire and a neutral wire. One end of the load is connected to the live wire, and the other end of the load is connected to the neutral wire. The switch includes a moving end, a first fixed end, and a second fixed end. One end of the compensation resistor is connected to the moving end, and the other end of the compensation resistor is connected to the ground wire. The first fixed end is connected to the live wire, and the second fixed end is connected to the neutral wire. The method includes: obtaining a plurality of first current values and a plurality of second current values, or obtaining a plurality of third current values and a plurality of fourth current values. The first current values and the second current values are each corresponding to a load one by one. The third current values and the fourth current values are each corresponding to a load one by one. The first current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is in a floating state. The second current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is connected to the first fixed end. The third current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is in a floating state. The fourth current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end. Judging whether the difference between each of the first current values and the corresponding second current value is within a preset difference range to obtain a plurality of first judgment results, or judging whether the difference between each of the third current values and the corresponding fourth current value is within the preset difference range to obtain a plurality of second judgment results. The first judgment results and the second judgment results are each corresponding to a load one by one. Determining the type of grounding fault according to the first judgment result, or determining the type of grounding fault according to the second judgment result. The type of grounding fault is that the corresponding load has a grounding fault or the UPS power supply has a grounding fault.

[0016] Optionally, obtaining a plurality of first current values and a plurality of second current values includes: when the potential of the neutral wire is equal to zero, obtaining a plurality of the first current values; controlling the moving end to be connected to the first fixed end; when the moving end is normally connected to the first fixed end, obtaining a plurality of the second current values.

[0017] Optionally, obtaining a plurality of third current values and a plurality of fourth current values includes: when the potential of the live wire is equal to zero, obtaining a plurality of the third current values; controlling the moving end to be connected to the second fixed end; when the moving end is normally connected to the second fixed end, obtaining a plurality of the fourth current values.

[0018] Optionally, according to the first determination result, determining the type of ground fault, including: when all the first determination results are yes, determining that there is a ground fault in the UPS power supply; when at least one of the first determination results is no, determining that there is a ground fault in the load corresponding to the first determination result.

[0019] Optionally, according to the second determination result, determining the type of ground fault, including: when all the second determination results are yes, determining that there is a ground fault in the UPS power supply; when at least one of the second determination results is no, determining that there is a ground fault in the load corresponding to the second determination result.

[0020] Optionally, after determining the type of ground fault according to the first determination result or determining the type of ground fault according to the second determination result, the method further includes: when the delay time is greater than or equal to a preset time, controlling the moving end to be suspended, where the delay time is the difference between the current time node and the time node corresponding to the determination of the type of ground fault.

[0021] According to another aspect of the embodiments of the present application, there is also provided a device for determining the type of grounding fault of a UPS power supply. The UPS power supply grounding fault monitoring device includes a UPS power supply, multiple loads, a switch, and a compensating resistor. The UPS power supply includes a live wire and a neutral wire. One end of the load is connected to the live wire, and the other end of the load is connected to the neutral wire. The switch includes a moving end, a first fixed end, and a second fixed end. One end of the compensating resistor is connected to the moving end, and the other end of the compensating resistor is connected to the ground wire. The first fixed end is connected to the live wire, and the second fixed end is connected to the neutral wire. The device includes: an acquisition unit that acquires multiple first current values and multiple second current values, or acquires multiple third current values and multiple fourth current values. The first current values and the second current values are each corresponding to a load one by one. The third current values and the fourth current values are each corresponding to a load one by one. The first current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is in a floating state. The second current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is connected to the first fixed end. The third current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is in a floating state. The fourth current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end. A judgment unit that judges whether the difference between each first current value and the corresponding second current value is within a preset difference range to obtain multiple first judgment results, or judges whether the difference between each third current value and the corresponding fourth current value is within the preset difference range to obtain multiple second judgment results. The first judgment results and the second judgment results are each corresponding to a load one by one. A determination unit that determines the type of grounding fault according to the first judgment results, or determines the type of grounding fault according to the second judgment results. The type of grounding fault is that the corresponding load has a grounding fault or the UPS power supply has a grounding fault.

[0022] According to yet another aspect of the embodiments of the present application, there is also provided a computer-readable storage medium. The computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described above.

[0023] According to still another aspect of the embodiments of the present application, there is also provided a processor. The processor is used to run a program, wherein the program executes any one of the methods described above when running.

[0024] According to an aspect of an embodiment of the present application, there is also provided a system for determining the type of grounding fault of a UPS power supply, including: a UPS power supply grounding fault monitoring device, one or more processors, a memory, and one or more programs, wherein the UPS power supply grounding fault monitoring device includes a UPS power supply, a plurality of loads, a switch, and a compensation resistor, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include means for executing any one of the above methods.

[0025] In the above method for determining the type of grounding fault of a UPS power supply, first, a plurality of first current values and a plurality of second current values are obtained, or a plurality of third current values and a plurality of fourth current values are obtained. The above first current values and the above second current values correspond one-to-one to the above loads, and the above third current values and the above fourth current values correspond one-to-one to the above loads. The above first current value is the value of the current flowing through the corresponding load when the potential of the neutral line is equal to zero and the moving end is in a floating state, and the above second current value is the value of the current flowing through the corresponding load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above third current value is the value of the current flowing through the corresponding load when the potential of the live line is equal to zero and the moving end is in a floating state, and the above fourth current value is the value of the current flowing through the corresponding load when the potential of the live line is equal to zero and the moving end is connected to the second fixed end. Then, it is determined whether the difference between each of the above first current values and the corresponding above second current values is within a preset difference range to obtain a plurality of first determination results, or it is determined whether the difference between each of the above third current values and the corresponding above fourth current values is within the above preset difference range to obtain a plurality of second determination results. The above first determination results and the above second determination results correspond one-to-one to the above loads. Finally, according to the above first determination results, the type of grounding fault is determined, or according to the above second determination results, the above type of grounding fault is determined. The above type of grounding fault is that there is a grounding fault in the corresponding load or there is a grounding fault in the UPS power supply itself. In this method, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the type of grounding fault is that there is a grounding fault in the corresponding load or there is a grounding fault in the UPS power supply itself. When the potential of the live line is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the type of grounding fault is that there is a grounding fault in the corresponding load or there is a grounding fault in the UPS power supply itself. This method solves the problem in the prior art that when using the capacitance or inductance compensation differential current method, it is easy to have an unclear change in the current flowing through the load before and after compensation. Description of the Drawings

[0026] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The illustrative embodiments and descriptions thereof of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0027] Figure 1 A flowchart of a method for determining the type of ground fault of a UPS power supply according to an embodiment of this application is shown;

[0028] Figure 2 A schematic diagram of a UPS power supply ground fault monitoring device according to an embodiment of this application is shown;

[0029] Figure 3 A schematic diagram of a UPS power supply ground fault monitoring device according to a specific embodiment of this application is shown;

[0030] Figure 4 A flowchart of a method for determining the type of ground fault of a UPS power supply according to a specific embodiment of this application is shown;

[0031] Figure 5 A schematic diagram of a device for determining the type of ground fault of a UPS power supply according to an embodiment of this application is shown. Detailed implementation manners

[0032] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the accompanying drawings and combine the embodiments to detail this application.

[0033] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0034] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of this application described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the description and claims, when an element is described as being "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0036] As described in the background art, when the capacitance or inductance compensation differential current method is used in the prior art, it is easy to have the problem that the change in the current flowing through the load before and after compensation is not obvious. To solve the above problem, in a typical implementation manner of this application, a method for determining the type of grounding fault of a UPS power supply, a determining device, a computer-readable storage medium, a processor, and a determining system are provided.

[0037] According to an embodiment of this application, a method for determining the type of grounding fault of a UPS power supply is provided.

[0038] Figure 1 is a flowchart of a method for determining the type of grounding fault of a UPS power supply according to an embodiment of this application. As Figure 1 shown, the method includes the following steps:

[0039] Step S101: Obtain a plurality of first current values and a plurality of second current values, or obtain a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values are both in one-to-one correspondence with the above-mentioned load. The above-mentioned third current values and the above-mentioned fourth current values are both in one-to-one correspondence with the above-mentioned load. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is connected to the second fixed end;

[0040] Step S102: Determine whether the difference between each of the above-mentioned first current values and the corresponding above-mentioned second current value is within a preset difference range to obtain a plurality of first judgment results, or determine whether the difference between each of the above-mentioned third current values and the corresponding above-mentioned fourth current value is within the above-mentioned preset difference range to obtain a plurality of second judgment results. The above-mentioned first judgment results and the above-mentioned second judgment results are both in one-to-one correspondence with the above-mentioned load;

[0041] Step S103: Determine the type of grounding fault according to the above-mentioned first judgment result, or determine the above-mentioned type of grounding fault according to the above-mentioned second judgment result. The above-mentioned type of grounding fault is that there is a grounding fault in the corresponding above-mentioned load or there is a grounding fault in the above-mentioned UPS power supply.

[0042] In the method for determining the above-mentioned grounding fault type of the UPS power supply, first, a plurality of first current values and a plurality of second current values are obtained, or a plurality of third current values and a plurality of fourth current values are obtained. The above-mentioned first current values and the above-mentioned second current values correspond to the above-mentioned loads one by one. The above-mentioned third current values and the above-mentioned fourth current values correspond to the above-mentioned loads one by one. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is connected to the second fixed end. Then, it is judged whether the difference between each above-mentioned first current value and the corresponding above-mentioned second current value is within a preset difference range, and a plurality of first judgment results are obtained, or it is judged whether the difference between each above-mentioned third current value and the corresponding above-mentioned fourth current value is within the above-mentioned preset difference range, and a plurality of second judgment results are obtained. The above-mentioned first judgment results and the above-mentioned second judgment results correspond to the above-mentioned loads one by one. Finally, according to the above-mentioned first judgment results, the grounding fault type is determined, or according to the above-mentioned second judgment results, the above-mentioned grounding fault type is determined. The above-mentioned grounding fault type is that the corresponding above-mentioned load has a grounding fault or the UPS power supply has a grounding fault. In this method, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then the grounding fault type is determined as that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. When the potential of the live line is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then the grounding fault type is determined as that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. This method solves the problem in the prior art that when using the capacitor or inductor compensation differential current method, the change in the current flowing through the load before and after compensation is not obvious.

[0043] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0044] In an optional embodiment of the present application, the above-mentioned method for determining the grounding fault type of the UPS power supply is executed by using the above-mentioned grounding fault monitoring device of the UPS power supply, as Figure 2As shown in the figure, the monitoring device includes a CPU module, an LED liquid crystal display module, a button module, a voltage acquisition module, a current acquisition module, a compensation resistor circuit drive module, a power supply module, a compensation resistor circuit switch, a compensation resistor circuit, a voltmeter, and multiple current transformers. Among them, the CPU module is a processor for data conversion, logical judgment, and driver programs of other modules, and is the core of the UPS power supply ground fault monitoring device; the LED liquid crystal display module is used to display the differential current values of each load (i.e., the current values flowing through each load), the potential of the neutral line N, and ground fault alarms, etc. The display interfaces can be switched through the button module. The ground fault alarm function can report which branch load has a ground fault or the UPS power supply has a ground fault, can display the real-time status of the compensation resistor circuit switch, can store historical ground fault alarm information, and can display various parameter setting interfaces; the voltage acquisition module is used to collect the data of the voltmeter, and the voltage acquisition module and the voltmeter are transmitted through 4-20mA; the compensation resistor circuit switch drive module is used to drive the compensation resistor circuit switch; the power supply module provides power for other modules; as Figure 3 shown in the figure, the voltmeter V is installed between the neutral line and the ground wire at the output end of the UPS power supply, and is used to detect the magnitude of the potential UN of the neutral line; the current acquisition module is used to connect to the current transformers of each load, and then collect the differential current values of each load. The current acquisition module and the current transformers are transmitted through 4-20mA; as Figure 3 shown in the figure, the current transformers adopt high-precision through-hole current transformers, which are installed at the upper mouth of each load circuit breaker. The live wire and the neutral line of the load pass through the current transformer side by side. The current transformer is used to collect the differential current values of each load. In the figure, L1, L2, Ln are each load, S1, S2, Sn are the circuit breakers of each load, and A1, A2, AN are each current transformer; the compensation resistor circuit switch is the above-mentioned switch QF, which adopts a two-way electric drive circuit breaker and accepts the instructions of the CPU module for opening and closing. The moving end is connected to the compensation resistor circuit module R, that is, the above-mentioned compensation resistor. The moving end can be connected to the first fixed end connected to the live wire L at the output end of the UPS power supply, or to the second fixed end connected to the neutral line N at the output end of the UPS power supply; Compensation circuit loop: The resistance value of the compensation circuit loop can be set through the button module, and its setting range is 150Ω - 350Ω, with a withstand voltage level of 500V. The resistance selection should ensure that the generated current does not cause the branch to trip. The compensation resistor circuit resistor can select a wire-wound sliding resistor with a withstand voltage level of 500V and a resistance value of 350Ω.

[0045] In an alternative embodiment of the present application, obtaining a plurality of first current values and a plurality of second current values includes: when the potential of the above-mentioned neutral line is equal to zero, obtaining a plurality of the above-mentioned first current values; controlling the above-mentioned moving end to be connected to the above-mentioned first fixed end; when the above-mentioned moving end is normally connected to the above-mentioned first fixed end, obtaining a plurality of the above-mentioned second current values. In this embodiment, as Figure 4 shown, the current acquisition module continuously acquires the differential current values of the loads of N branches in real time, and the voltage acquisition module continuously acquires the potential of the neutral line N and records it as UN. When the CPU module determines that the potential UN of the neutral line N is 0V, N first current values are stored, that is, the differential current values ΔI of the loads of the current N branches are stored i , and then the CPU module issues an instruction, and the compensation resistance circuit switch driving module drives the moving end of the compensation circuit switch to be connected to the first fixed end, that is, the compensation resistance circuit switch drives the compensation circuit switch to be closed and operate on the live wire L. After the compensation circuit resistance circuit is connected to the live wire L, the current acquisition module acquires N second current values, that is, acquires the differential current values ΔI of the loads of the N branches after the compensation circuit resistance circuit is connected i ′, i ∈ [1, N].

[0046] In an alternative embodiment of the present application, obtaining a plurality of third current values and a plurality of fourth current values includes: when the potential of the above-mentioned live wire is equal to zero, obtaining a plurality of the above-mentioned third current values; controlling the above-mentioned moving end to be connected to the above-mentioned second fixed end; when the above-mentioned moving end is normally connected to the above-mentioned second fixed end, obtaining a plurality of the above-mentioned fourth current values. In this embodiment, as Figure 4 shown, when the CPU module determines that the potential UN of the neutral line N is 220V (that is, the potential UL of the live wire L is 0V), N third current values are stored, that is, the differential current values ΔI of the loads of the current N branches are stored i , and then the CPU module issues an instruction, and the compensation resistance circuit switch driving module drives the moving end of the compensation circuit switch to be connected to the second fixed end, that is, the compensation resistance circuit switch drives the compensation circuit switch to be closed and operate on the neutral line N. After the compensation circuit resistance circuit is connected to the neutral line N, the current acquisition module acquires N fourth current values, that is, acquires the differential current values ΔI of the loads of the N branches after the compensation circuit resistance circuit is connected i ′, i ∈ [1, N].

[0047] In an alternative embodiment of the present application, determining the type of ground fault according to the above first judgment result includes: when all the above first judgment results are yes, determining that there is a ground fault in the above UPS power supply; when at least one of the above first judgment results is no, determining that there is a ground fault in the above load corresponding to the above first judgment result. In this embodiment, as Figure 4As shown, when the CPU module determines that the potential UN of the neutral line N is 0V, the CPU module obtains the magnitude of the differential current value of the loads of each branch before and after the live line L is connected to the compensation resistor circuit. Then, the CPU module compares the magnitudes of the differential current values of the loads before and after the live line L is connected to the compensation resistor circuit, that is, compares ΔI of each load i and ΔI i ′. Multiple first judgment results are obtained. If the first judgment result is that the ΔI of the load on the i-th branch i ′ is larger than ΔI i , it is determined that there is a ground fault in the load on the i-th branch. If the magnitudes of the differential current values of each load before and after the live line L is connected to the compensation resistor circuit are basically unchanged, that is, the difference values of ΔI i of ΔI i ′ of each load on the N branches are all within the preset difference range, it is determined that there is a ground fault in the UPS power supply itself. It is possible to determine which specific load branch has a ground fault or the UPS power supply itself has a ground fault. Moreover, the CPU module can drive the LED liquid crystal display module to display the ground fault information in real time and store it in the historical database.

[0048] In an optional embodiment of the present application, according to the above second judgment result, determining the above ground fault type includes: when all the above second judgment results are yes, determining that there is a ground fault in the above UPS power supply; when at least one of the above second judgment results is no, determining that there is a ground fault in the above load corresponding to the second judgment result. In this embodiment, as Figure 4 shown, when the CPU module determines that the potential UN of the neutral line N is 220V (i.e., the potential UL of the live line L is 0V), the CPU module obtains the magnitude of the differential current value of the loads of each branch before and after the neutral line N is connected to the compensation resistor circuit. Then, the CPU module compares the magnitudes of the differential current values of the loads before and after the neutral line N is connected to the compensation resistor circuit, that is, compares ΔI of each load i and ΔI i ′. Multiple second judgment results are obtained. If the second judgment result is that the ΔI of the load on the i-th branch i ′ is larger than ΔI i , it is determined that there is a ground fault in the load on the i-th branch. If the magnitudes of the differential current values of each load before and after the neutral line N is connected to the compensation resistor circuit are basically unchanged, that is, the difference values of ΔI i of ΔI i ′ of each load on the N branches are all within the preset difference range, it is determined that there is a ground fault in the UPS power supply itself. It is possible to determine which specific load branch has a ground fault or the UPS power supply itself has a ground fault. Moreover, the CPU module can drive the LED liquid crystal display module to display the ground fault information in real time and store it in the historical database.

[0049] In an optional embodiment of the present application, after determining the type of ground fault according to the above first determination result or determining the type of the ground fault according to the above second determination result, the method further includes: when the delay time is greater than or equal to a preset time, controlling the moving end to be suspended, where the delay time is the difference between the current time node and the time node corresponding to the determination of the type of ground fault. In this embodiment, as Figure 4 shown, after determining the type of ground fault, after a set delay time T, the CPU module issues an instruction, and the compensation resistance circuit breaker drive module drives the moving end of the compensation circuit breaker to be suspended, that is, the compensation resistance circuit breaker drive module drives the compensation circuit breaker to open. After the execution is completed, an instruction is issued again to control the current acquisition module to continue to collect the differential current values of the loads on N branches in real time, and the voltage acquisition module continues to collect the potential of the neutral line N in real time. Among them, the delay time T can be set through the button module, and the set range of the delay time T is 0-5 s, realizing that after determining the type of ground fault, the device can issue an instruction to disconnect the compensation resistance circuit from the neutral line N or the live line L.

[0050] In an optional embodiment of the present application, the advantages of the method for determining the type of ground fault of the UPS power supply of the present application are as follows: 1. When searching for the type of ground fault, regardless of whether the load currents are capacitive or inductive, after connecting the compensation resistance circuit, the differential current value of the load with the ground fault must increase, avoiding the misjudgment of the type of ground fault caused by the over-compensation and full-compensation phenomena in the traditional capacitance or inductance compensation differential current method; 2. The UPS power supply ground fault monitoring device of the present application can judge through the CPU module and then issue an instruction to drive the compensation resistance circuit breaker to automatically close to the live line L or the neutral line N, avoiding the risk of electric shock caused by manual closing of the circuit breaker. 3. The UPS power supply ground fault monitoring device of the present application can automatically collect the differential current values of the loads on each branch and the potential of the neutral line, which can prevent the errors existing in manual detection.

[0051] The embodiment of the present application also provides a device for determining the type of ground fault of a UPS power supply. It should be noted that the device for determining the type of ground fault of the UPS power supply in the embodiment of the present application can be used to execute the method for determining the type of ground fault of the UPS power supply provided by the embodiment of the present application. The device for determining the type of ground fault of the UPS power supply provided by the embodiment of the present application is introduced below.

[0052] Figure 5 is a schematic diagram of the device for determining the type of ground fault of the UPS power supply according to the embodiment of the present application. As Figure 5 shown, the device includes:

[0053] An acquisition unit 10 acquires a plurality of first current values and a plurality of second current values, or acquires a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values correspond to the above-mentioned loads one by one. The above-mentioned third current values and the above-mentioned fourth current values correspond to the above-mentioned loads one by one. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is connected to the second fixed end;

[0054] A judgment unit 20 judges whether the difference between each of the above-mentioned first current values and the corresponding above-mentioned second current values is within a preset difference range, and obtains a plurality of first judgment results, or judges whether the difference between each of the above-mentioned third current values and the corresponding above-mentioned fourth current values is within the above-mentioned preset difference range, and obtains a plurality of second judgment results. The above-mentioned first judgment results and the above-mentioned second judgment results correspond to the above-mentioned loads one by one;

[0055] A determination unit 30 determines the type of grounding fault according to the above-mentioned first judgment result, or determines the above-mentioned type of grounding fault according to the above-mentioned second judgment result. The above-mentioned type of grounding fault is that there is a grounding fault in the corresponding above-mentioned load or there is a grounding fault in the above-mentioned UPS power supply.

[0056] In the device for determining the above-mentioned UPS power supply grounding fault type, an acquisition unit acquires a plurality of first current values and a plurality of second current values, or acquires a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values are both in one-to-one correspondence with the above-mentioned load. The above-mentioned third current values and the above-mentioned fourth current values are both in one-to-one correspondence with the above-mentioned load. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live line is equal to zero and the moving end is connected to the second fixed end. A judgment unit judges whether the difference between each of the above-mentioned first current values and the corresponding above-mentioned second current values is within a preset difference range, and obtains a plurality of first judgment results, or judges whether the difference between each of the above-mentioned third current values and the corresponding above-mentioned fourth current values is within the above-mentioned preset difference range, and obtains a plurality of second judgment results. The above-mentioned first judgment results and the above-mentioned second judgment results are both in one-to-one correspondence with the above-mentioned load. A determination unit determines the grounding fault type according to the above-mentioned first judgment result, or determines the above-mentioned grounding fault type according to the above-mentioned second judgment result. The above-mentioned grounding fault type is that the corresponding above-mentioned load has a grounding fault or the above-mentioned UPS power supply has a grounding fault. In this device, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and further the grounding fault type is determined as that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. When the potential of the live line is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and further the grounding fault type is determined as that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. This device solves the problem in the prior art that when using the capacitor or inductor compensation differential current method, it is easy to have an insignificant change in the current flowing through the load before and after compensation.

[0057] In an optional embodiment of the present application, the above-mentioned device for determining the UPS power supply grounding fault type is used to execute the above-mentioned method for determining the UPS power supply grounding fault type, such as Figure 2As shown in the figure, the monitoring device includes a CPU module, an LED liquid crystal display module, a button module, a voltage acquisition module, a current acquisition module, a compensation resistance circuit drive module, a power supply module, a compensation resistance circuit switch, a compensation resistance circuit, a voltmeter, and multiple current transformers. Among them, the CPU module is a processor for data conversion, logical judgment, and driver programs of other modules, and is the core of the UPS power supply ground fault monitoring device; the LED liquid crystal display module is used to display the differential current values of each load (i.e., the current values flowing through each load), the potential of the neutral line N, and ground fault alarms, etc. The display interfaces can be switched through the button module. The ground fault alarm function can report which branch load has a ground fault or the UPS power supply has a ground fault, can display the real-time state of the compensation resistance circuit switch, can store historical ground fault alarm information, and can display various parameter setting interfaces; the voltage acquisition module is used to acquire the data of the voltmeter, and the voltage acquisition module and the voltmeter are transmitted through 4-20mA; the compensation resistance circuit switch drive module is used to drive the compensation resistance circuit switch; the power supply module provides power for other modules; as Figure 3 shown in the figure, the voltmeter V is installed between the neutral line and the ground wire at the output end of the UPS power supply, and is used to detect the magnitude of the potential UN of the neutral line; the current acquisition module is used to access the current transformers of each load, and then acquire the differential current values of each load. The current acquisition module and the current transformers are transmitted through 4-20mA; as Figure 3 shown in the figure, the current transformers adopt high-precision through-core current transformers, which are installed at the upper mouth of each load air switch. The live wire and the neutral line of the load pass through the current transformer side by side. The current transformer is used to acquire the differential current values of each load. In the figure, L1, L2, Ln are each load, S1, S2, Sn are the air switches of each load, and A1, A2, AN are each current transformer; the compensation resistance circuit switch is the above-mentioned switch QF, which adopts a two-way electric drive air switch and accepts the instructions of the CPU module for opening and closing. The moving end is connected to the compensation resistance circuit module R, that is, the above-mentioned compensation resistance. The moving end can be connected to the first fixed end connected to the live wire L at the output end of the UPS power supply, or connected to the second fixed end connected to the neutral line N at the output end of the UPS power supply; compensation circuit loop: the resistance value of the compensation circuit loop can be set through the button module, and its setting range is 150Ω-350Ω, and the withstand voltage level is 500V. The resistance selection should ensure that the generated current cannot cause the branch to trip. The compensation resistance circuit resistance can select a wire-wound sliding rheostat with a withstand voltage level of 500V and a resistance value of 350Ω.

[0058] In an alternative embodiment of the present application, the acquisition unit includes a first acquisition module, a first control module, and a second acquisition module. The first acquisition module is configured to acquire a plurality of the first current values when the potential of the neutral line is equal to zero; the first control module is configured to control the moving end to be connected to the first fixed end; the second acquisition module is configured to acquire a plurality of the second current values when the moving end is normally connected to the first fixed end. In this embodiment, as Figure 4 shown, the current acquisition module acquires the differential current values of the loads of N branches in real time, and the voltage acquisition module acquires the potential of the neutral line N in real time and records it as UN. When the CPU module determines that the potential UN of the neutral line N is 0V, N first current values are stored, that is, the differential current values ΔI of the loads of the current N branches are stored i . Then, the CPU module issues an instruction, and the compensation resistance circuit switch driving module drives the moving end of the compensation circuit switch to be connected to the first fixed end, that is, the compensation resistance circuit switch drives the compensation circuit switch to be closed and operate on the live wire L. After the compensation loop resistance circuit is connected to the live wire L, the current acquisition module acquires N second current values, that is, the differential current values ΔI of the loads of the N branches after the compensation loop resistance circuit is connected i ′, i ∈ [1, N].

[0059] In an alternative embodiment of the present application, the acquisition unit further includes a third acquisition module, a second control module, and a fourth acquisition module. The third acquisition module is configured to acquire a plurality of the third current values when the potential of the live wire is equal to zero; the second control module is configured to control the moving end to be connected to the second fixed end; the fourth acquisition module is configured to acquire a plurality of the fourth current values when the moving end is normally connected to the second fixed end. In this embodiment, as Figure 4 shown, when the CPU module determines that the potential UN of the neutral line N is 220V (i.e., the potential UL of the live wire L is 0V), N third current values are stored, that is, the differential current values ΔI of the loads of the current N branches are stored i . Then, the CPU module issues an instruction, and the compensation resistance circuit switch driving module drives the moving end of the compensation circuit switch to be connected to the second fixed end, that is, the compensation resistance circuit switch drives the compensation circuit switch to be closed and operate on the neutral line N. After the compensation loop resistance circuit is connected to the neutral line N, the current acquisition module acquires N fourth current values, that is, the differential current values ΔI of the loads of the N branches after the compensation loop resistance circuit is connected i ′, i ∈ [1, N].

[0060] In an alternative embodiment of the present application, the determination unit includes a first determination module and a second determination module. The first determination module is configured to determine that there is a ground fault in the UPS power supply when all of the above first determination results are yes; the second determination module is configured to determine that there is a ground fault in the load corresponding to the first determination result when at least one of the above first determination results is no. In this embodiment, as Figure 4 shown, when the CPU module determines that the potential UN of the neutral line N is 0V, the CPU module obtains the magnitude of the differential current values of the loads of each branch before and after the live wire L is connected to the compensation resistance circuit. Then, the CPU module compares the magnitudes of the differential current values of the loads before and after the live wire L is connected to the compensation resistance circuit, that is, compares the ΔI i and ΔI i ′ of each load, and obtains a plurality of first determination results. If the first determination result is that the ΔI i ′ of the load on the i-th branch is larger than ΔI i , it is determined that there is a ground fault in the load on the i-th branch. If the magnitudes of the differential current values of the loads before and after the live wire L is connected to the compensation resistance circuit are basically unchanged, that is, the difference values of ΔI i of each load on each of the N branches and ΔI i ′ are within the preset difference range, it is determined that there is a ground fault in the UPS power supply itself. It is possible to determine which specific load branch has a ground fault or the UPS power supply itself has a ground fault. Moreover, the CPU module can drive the LED liquid crystal display module to display the ground fault information in real time and store it in the historical database.

[0061] In an alternative embodiment of the present application, the determination unit further includes a third determination module and a fourth determination module. The third determination module is configured to determine that there is a ground fault in the UPS power supply when all of the above second determination results are yes; the fourth determination module is configured to determine that there is a ground fault in the load corresponding to the second determination result when at least one of the above second determination results is no. In this embodiment, as Figure 4 shown, when the CPU module determines that the potential UN of the neutral line N is 220V (i.e., the potential UL of the live wire L is 0V), the CPU module obtains the magnitude of the differential current values of the loads of each branch before and after the neutral line N is connected to the compensation resistance circuit. Then, the CPU module compares the magnitudes of the differential current values of the loads before and after the neutral line N is connected to the compensation resistance circuit, that is, compares the ΔI i and ΔI i ′ of each load, and obtains a plurality of second determination results. If the second determination result is that the ΔI i ′ of the load on the i-th branch is larger than ΔI iis large, it is determined that there is a ground fault in the load of the i-th branch. If the differential current values of each load before and after the neutral line N is connected to the compensation resistance circuit are basically unchanged, that is, the ΔI i of ΔI i ′ differences of each branch of the N branches are all within the preset difference range, it is determined that there is a ground fault in the UPS power supply itself. It is possible to determine which specific load branch has a ground fault or the UPS power supply itself has a ground fault. Moreover, the CPU module can drive the LED liquid crystal display module to display the ground fault information in real time and store it in the historical database.

[0062] In an optional embodiment of the present application, the device for determining the type of ground fault of the UPS power supply further includes a control unit. The control unit is used to control the moving end to be suspended when the delay time is greater than or equal to the preset time. The delay time is the difference between the current time node and the time node corresponding to determining the type of ground fault. In this embodiment, as Figure 4 shown, after determining the type of ground fault, after a set delay time T, the CPU module issues an instruction, and the compensation resistance circuit switch driving module drives the moving end of the compensation circuit switch to be suspended, that is, the compensation resistance circuit switch driving module drives the compensation circuit switch to disconnect. After the execution is completed, another instruction is issued to control the current acquisition module to continue to collect the differential current values of the loads of the N branches in real time, and the voltage acquisition module to continue to collect the potential of the neutral line N in real time. Among them, the delay time T can be set through the button module, and the delay time setting range T is 0 - 5s. It realizes that after determining the type of ground fault, the device can issue an instruction to disconnect the compensation resistance circuit from the neutral line N or the live wire L.

[0063] In an optional embodiment of the present application, the advantages of the method for determining the type of ground fault of the UPS power supply of the present application are as follows: 1. When searching for the type of ground fault, regardless of whether the load current of each load is capacitive or inductive, after connecting to the compensation resistance circuit, the differential current value of the load with a ground fault must increase, avoiding the misjudgment of the type of ground fault caused by the over-compensation and full-compensation phenomena in the traditional capacitance or inductance compensation differential current method; 2. The ground fault monitoring device of the UPS power supply of the present application can be judged by the CPU module and then issue an instruction to drive the compensation resistance circuit air switch to automatically close to the live wire L or the neutral line N, avoiding the risk of electric shock caused by manual closing of the air switch. 3. The ground fault monitoring device of the UPS power supply of the present application can automatically collect the differential current values of the loads of each branch and the potential of the neutral line, and can prevent the errors caused by manual detection.

[0064] The above-mentioned device for determining the grounding fault type of the UPS power supply includes a processor and a memory. The above-mentioned acquisition unit, judgment unit, determination unit, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.

[0065] The processor contains a kernel, and the kernel retrieves the corresponding program units from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the problem that the change in the current flowing through the load before and after compensation is not obvious when using the capacitor or inductor compensation differential current method in the prior art can be solved.

[0066] The memory may include non-permanent memory in a computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flashRAM), and the memory includes at least one memory chip.

[0067] An embodiment of the present application provides a storage medium, on which a program is stored, and when the program is executed by a processor, it implements the above-mentioned method for determining the grounding fault type of the UPS power supply.

[0068] An embodiment of the present application provides a processor, and the above-mentioned processor is used to run a program, wherein when the above-mentioned program runs, it executes the above-mentioned method for determining the grounding fault type of the UPS power supply.

[0069] An embodiment of the present application provides a system for determining the grounding fault type of a UPS power supply, including: a UPS power supply grounding fault monitoring device, one or more processors, a memory, and one or more programs. Among them, the above-mentioned UPS power supply grounding fault monitoring device includes a UPS power supply, a plurality of loads, a switch, and a compensation resistor. The above-mentioned one or more programs are stored in the above-mentioned memory and are configured to be executed by the above-mentioned one or more processors. The above-mentioned one or more programs include methods for executing any one of the above, and when the processor executes the program, it realizes at least the following steps:

[0070] Step S101: Obtain a plurality of first current values and a plurality of second current values, or obtain a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values are all in one-to-one correspondence with the above-mentioned load. The above-mentioned third current values and the above-mentioned fourth current values are all in one-to-one correspondence with the above-mentioned load. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end;

[0071] Step S102: Determine whether the difference between each of the above-mentioned first current values and the corresponding above-mentioned second current value is within a preset difference range to obtain a plurality of first judgment results, or determine whether the difference between each of the above-mentioned third current values and the corresponding above-mentioned fourth current value is within the above-mentioned preset difference range to obtain a plurality of second judgment results. The above-mentioned first judgment results and the above-mentioned second judgment results are all in one-to-one correspondence with the above-mentioned load;

[0072] Step S103: Determine the type of grounding fault according to the above-mentioned first judgment result, or determine the above-mentioned type of grounding fault according to the above-mentioned second judgment result. The above-mentioned type of grounding fault is that there is a grounding fault in the corresponding above-mentioned load or there is a grounding fault in the above-mentioned UPS power supply.

[0073] The present application also provides a computer program product, which is suitable for executing a program initialized with at least the following method steps when executed on a data processing device:

[0074] Step S101: Obtain a plurality of first current values and a plurality of second current values, or obtain a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values are all in one-to-one correspondence with the above-mentioned load. The above-mentioned third current values and the above-mentioned fourth current values are all in one-to-one correspondence with the above-mentioned load. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end;

[0075] Step S102: Determine whether the difference between each of the above first current values and the corresponding second current value is within a preset difference range, obtaining a plurality of first judgment results, or determine whether the difference between each of the above third current values and the corresponding fourth current value is within the above preset difference range, obtaining a plurality of second judgment results. Both the above first judgment results and the above second judgment results correspond to the above loads one by one;

[0076] Step S103: Determine the type of grounding fault according to the above first judgment result, or determine the above type of grounding fault according to the above second judgment result. The above type of grounding fault is that the corresponding above load has a grounding fault or the above UPS power supply has a grounding fault.

[0077] In the above embodiments of the present application, the descriptions of the various embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0078] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the above division of units can be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces. The indirect coupling or communication connection of units or modules can be in an electrical or other form.

[0079] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0080] In addition, in each embodiment of the present application, the various functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0081] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks, or optical discs.

[0082] From the above description, it can be seen that the above embodiments of this application achieve the following technical effects:

[0083] 1) In the method for determining the grounding fault type of the UPS power supply of the present application, first, a plurality of first current values and a plurality of second current values are obtained, or a plurality of third current values and a plurality of fourth current values are obtained. The above-mentioned first current values and the above-mentioned second current values correspond to the above-mentioned loads one by one. The above-mentioned third current values and the above-mentioned fourth current values correspond to the above-mentioned loads one by one. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end. Then, it is judged whether the difference between each above-mentioned first current value and the corresponding above-mentioned second current value is within a preset difference range, and a plurality of first judgment results are obtained, or it is judged whether the difference between each above-mentioned third current value and the corresponding above-mentioned fourth current value is within the above-mentioned preset difference range, and a plurality of second judgment results are obtained. The above-mentioned first judgment results and the above-mentioned second judgment results correspond to the above-mentioned loads one by one. Finally, according to the above-mentioned first judgment result, the grounding fault type is determined, or according to the above-mentioned second judgment result, the above-mentioned grounding fault type is determined. The above-mentioned grounding fault type is that the corresponding above-mentioned load has a grounding fault or the UPS power supply has a grounding fault. In this method, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. When the potential of the live wire is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. This method solves the problem in the prior art that when using the capacitance or inductance compensation differential current method, it is easy to have an unclear change in the current flowing through the load before and after compensation.

[0084] 2) In the device for determining the grounding fault type of the UPS power supply of the present application, the acquisition unit acquires a plurality of first current values and a plurality of second current values, or acquires a plurality of third current values and a plurality of fourth current values. The above-mentioned first current values and the above-mentioned second current values correspond to the above-mentioned loads one by one, and the above-mentioned third current values and the above-mentioned fourth current values correspond to the above-mentioned loads one by one. The above-mentioned first current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is in a floating state. The above-mentioned second current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the neutral line is equal to zero and the moving end is connected to the first fixed end. The above-mentioned third current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is in a floating state. The above-mentioned fourth current value is the value of the current flowing through the corresponding above-mentioned load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end. The judgment unit judges whether the difference between each of the above-mentioned first current values and the corresponding above-mentioned second current values is within a preset difference range, and obtains a plurality of first judgment results, or judges whether the difference between each of the above-mentioned third current values and the corresponding above-mentioned fourth current values is within the above-mentioned preset difference range, and obtains a plurality of second judgment results. The above-mentioned first judgment results and the above-mentioned second judgment results correspond to the above-mentioned loads one by one. The determination unit determines the grounding fault type according to the above-mentioned first judgment result, or determines the above-mentioned grounding fault type according to the above-mentioned second judgment result. The above-mentioned grounding fault type is that the corresponding above-mentioned load has a grounding fault or the UPS power supply has a grounding fault. In this device, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. When the potential of the live wire is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined that the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. This device solves the problem in the prior art that when using the capacitor or inductor compensation differential current method, it is easy to have an unclear change in the current flowing through the load before and after compensation.

[0085] 3) The system for determining the type of grounding fault of the UPS power supply of the present application includes: a UPS power supply grounding fault monitoring device, one or more processors, a memory, and one or more programs. Among them, the above-mentioned UPS power supply grounding fault monitoring device includes a UPS power supply, multiple loads, a switch, and a compensation resistor. The above-mentioned one or more programs are stored in the above-mentioned memory and are configured to be executed by the above-mentioned one or more processors. The above-mentioned one or more programs include those for executing any one of the above-mentioned methods. In this system, when the potential of the neutral line is zero, by comparing whether the difference between the first current value and the corresponding second current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined whether the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. When the potential of the live line is zero, by comparing whether the difference between the third current value and the corresponding fourth current value is within the preset difference range, it is determined whether the value of the current flowing through the corresponding load changes before and after connecting the compensation resistor, and then it is determined whether the grounding fault type is that the corresponding load has a grounding fault or the UPS power supply itself has a grounding fault. This system solves the problem in the prior art that when using the capacitance or inductance compensation differential current method, it is easy for the current flowing through the load to change insignificantly before and after compensation.

[0086] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for determining the type of grounding fault of a UPS power supply, characterized in that, The UPS power supply grounding fault monitoring device includes a UPS power supply, multiple loads, a switch and a compensation resistor. The UPS power supply includes a live wire and a neutral wire. One end of the load is connected to the live wire, and the other end of the load is connected to the neutral wire. The switch includes a moving end, a first fixed end and a second fixed end. One end of the compensation resistor is connected to the moving end, and the other end of the compensation resistor is connected to the ground wire. The first fixed end is connected to the live wire, and the second fixed end is connected to the neutral wire. The method includes: Obtaining a plurality of first current values and a plurality of second current values, or obtaining a plurality of third current values and a plurality of fourth current values. The first current values and the second current values are both in one-to-one correspondence with the loads. The third current values and the fourth current values are both in one-to-one correspondence with the loads. The first current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is in a floating state. The second current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is connected to the first fixed end. The third current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is in a floating state. The fourth current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end; Judging whether the difference between each of the first current values and the corresponding second current value is within a preset difference range to obtain a plurality of first judgment results, or judging whether the difference between each of the third current values and the corresponding fourth current value is within the preset difference range to obtain a plurality of second judgment results. The first judgment results and the second judgment results are both in one-to-one correspondence with the loads; When all of the first judgment results are yes, it is determined that the UPS power supply has a grounding fault; when at least one of the first judgment results is no, it is determined that the load corresponding to the first judgment result has a grounding fault, Or, when all of the second judgment results are yes, it is determined that the UPS power supply has a grounding fault; when at least one of the second judgment results is no, it is determined that the load corresponding to the second judgment result has a grounding fault.

2. The method according to claim 1, characterized in that, Obtaining a plurality of first current values and a plurality of second current values includes: When the potential of the neutral wire is equal to zero, obtaining a plurality of the first current values; Controlling the moving end to be connected to the first fixed end; When the moving end is normally connected to the first fixed end, obtaining a plurality of the second current values.

3. The method according to claim 1, characterized in that, Obtaining a plurality of third current values and a plurality of fourth current values includes: When the potential of the live wire is equal to zero, obtaining a plurality of the third current values; Controlling the moving end to be connected to the second fixed end; When the moving end is normally connected to the second fixed end, obtaining a plurality of the fourth current values.

4. The method according to claim 1, wherein, after determining the type of ground fault according to the first determination result or determining the type of ground fault according to the second determination result, the method further includes: when the delay time is greater than or equal to a preset time, controlling the moving end to be suspended, where the delay time is the difference between the current time node and the time node corresponding to determining the type of ground fault.

5. A device for determining the type of ground fault of a UPS power supply, wherein, the UPS power supply ground fault monitoring device includes a UPS power supply, multiple loads, a switch, and a compensation resistor. The UPS power supply includes a live wire and a neutral wire. One end of the load is connected to the live wire, and the other end of the load is connected to the neutral wire. The switch includes a moving end, a first fixed end, and a second fixed end. One end of the compensation resistor is connected to the moving end, and the other end of the compensation resistor is connected to the ground wire. The first fixed end is connected to the live wire, and the second fixed end is connected to the neutral wire. The device includes: an acquisition unit configured to acquire multiple first current values and multiple second current values, or acquire multiple third current values and multiple fourth current values. The first current values and the second current values respectively correspond to the loads one by one. The third current values and the fourth current values respectively correspond to the loads one by one. The first current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is in a suspended state. The second current value is the value of the current flowing through the corresponding load when the potential of the neutral wire is equal to zero and the moving end is connected to the first fixed end. The third current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is in a suspended state. The fourth current value is the value of the current flowing through the corresponding load when the potential of the live wire is equal to zero and the moving end is connected to the second fixed end; a judgment unit configured to judge whether the difference between each of the first current values and the corresponding second current value is within a preset difference range to obtain multiple first judgment results, or judge whether the difference between each of the third current values and the corresponding fourth current value is within the preset difference range to obtain multiple second judgment results. The first judgment results and the second judgment results respectively correspond to the loads one by one; a determination unit configured to determine that the UPS power supply has a ground fault when all of the first judgment results are yes; determine that the load corresponding to the first judgment result has a ground fault when at least one of the first judgment results is no, or determine that the UPS power supply has a ground fault when all of the second judgment results are yes; determine that the load corresponding to the second judgment result has a ground fault when at least one of the second judgment results is no.

6. A computer-readable storage medium, wherein, the computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 4.

7. A processor, wherein, The processor is used to run a program, wherein, when the program runs, it executes the method described in any one of claims 1 to 4.

8. A system for determining the type of grounding fault of a UPS power supply, characterized in that it comprises: a UPS power supply grounding fault monitoring device, one or more processors, a memory, and one or more programs, wherein the UPS power supply grounding fault monitoring device comprises a UPS power supply, a plurality of loads, a switch, and a compensation resistor, the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 4.

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