Electric channeling detection device and method

Abstract

The invention discloses an electric channeling detection device and method. In the electric channeling detection device, a central control module is respectively connected with a power supply module for detection, a rectification and voltage regulation module and a multi-way switch module; the multi-way switch module, the voltage detection module and the multi-detection channel module are connected in sequence; the multi-detection channel module is provided with an alternating current detection channel and a direct current detection channel; the voltage detection module is provided with an AC voltage detection circuit and a DC voltage detection circuit. The power supply module for detection is connected with the rectification and voltage regulation module; and the central control module is used for controlling the output of the power supply module for detection, controlling the output of the rectification and voltage regulation module, controlling the on-off of the multi-way switch module and judging whether electric channeling exists between the alternating current loop and / or the direct current loop. According to the invention, electricity channeling detection requirements of a loop needing to be tested can be met through one-time wiring.

Description

Technical Field

[0001] This invention relates to the technical field of testing equipment, and in particular to a cross-current detection device and method. Background Technology

[0002] After maintenance of high-voltage circuits or replacement of equipment in secondary circuits, there is a possibility of cross-current in DC circuits and cross-current between AC and DC circuits, posing a serious threat to the safe operation of the power grid. When replacing or repairing primary equipment involves disconnecting or reconnecting a large number of AC and DC secondary circuits, in order to avoid accidental contact or disconnection leading to cross-current, a cross-current check must be performed after the wiring is completed.

[0003] In the existing technology, the instruments used for detecting cross-current in the secondary circuit include multimeters, resistance testers, and relay protection testers, and a DC power supply is required. In actual testing, it still relies on personnel to individually connect the power supply to the secondary circuit and switch the measurement objects one by one to determine whether cross-current exists.

[0004] However, traditional methods of detecting cross-current have several problems: First, they are prone to omissions, especially when the circuit breaker has multiple branches, including two or more control, signal, and AC branches. Repeated manual disconnection and reconnection can easily lead to omissions during testing. Second, they are inefficient. When multiple devices and multiple branches are involved, traditional methods are too time-consuming. Third, they are not safe to operate. Repeated disconnection and reconnection of power supplies poses a risk of electric shock and equipment damage. Summary of the Invention

[0005] To overcome one or more technical problems existing in the prior art, embodiments of the present invention provide a cross-current detection device and a cross-current detection method, so as to realize the cross-current detection requirements of the required test circuit by a single wiring and avoid the operation of disconnecting the wires in the middle.

[0006] One embodiment of the present invention is a crosscurrent detection device, comprising a central control module, a detection power supply module, a rectifier voltage regulation module, a multiplexer module, a voltage detection module, and a multi-detection channel module; The central control module is connected to the detection power supply module, the rectifier voltage regulation module, and the multiplexer module, respectively. The multi-channel switch module, voltage detection module, and multi-detection channel module are connected in sequence. The multi-channel detection module is equipped with AC detection channels and DC detection channels; The AC testing channel is used to connect to the AC circuit to be tested, and the DC testing channel is used to connect to the DC circuit to be tested. The voltage detection module is equipped with an AC voltage detection circuit and a DC voltage detection circuit; The AC voltage detection circuit is connected to the AC detection channel, and the DC voltage detection circuit is connected to the DC detection channel; The power supply module for testing is connected to the rectifier and voltage regulation module; The central control module is used to control the output of the detection power supply module, the output of the rectifier voltage regulation module, the on / off state of the multiplexer module, and to determine whether there is cross-current between the AC circuit and / or DC circuit.

[0007] Preferably, the cross-current detection device also includes a human-machine interaction module; The human-computer interaction module is connected to the central control module; The human-computer interaction module is used to send detection commands to the central control module.

[0008] More preferably, the human-machine interaction module is provided with a detection loop setting unit, which is used to set the detection commands for controlling the on / off state of the multiplexer module.

[0009] Preferably, the crosscurrent detection device also includes a safety protection module; The safety protection module is connected to the voltage detection module and the central control module respectively; The safety protection module is used to obtain the voltage value measured by the voltage detection module before the cross-current detection. When the voltage value is greater than the set safe voltage value, the central control module locks the multiplexer module to the open state.

[0010] More preferably, the safety protection module is an overvoltage protection circuit connected to the central control module; Alternatively, the central control module may include a security protection module.

[0011] Preferably, the central control module is equipped with a power relay module; The power relay module is connected to the detection power module, the rectifier voltage regulation module, and the multiplexer module, respectively.

[0012] Preferably, the multiplexer module includes at least two relays; The relay is connected to an AC voltage detection circuit or a DC voltage detection circuit.

[0013] Preferably, the DC voltage detection circuit and / or AC voltage detection circuit are provided with one or more; One or more corresponding DC detection channels and / or AC detection channels are provided.

[0014] One embodiment of the present invention is a cross-current detection method, executed according to any one of the preceding cross-current detection devices, comprising the following steps: All AC and / or DC circuits to be tested are connected to the multi-detection channel module at once; The central control module acquires the wiring information of the AC circuit and / or DC circuit with the multi-detection channel module; The central control module controls the multiplexer module and establishes an electrical connection between the AC voltage detection circuit and / or the DC voltage detection circuit and the central control module. After the electrical connection is established, the central control module switches the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence, and obtains the access circuit voltage value measured by the corresponding AC voltage detection circuit and / or DC voltage detection circuit. The central control module determines whether there is cross-current between the corresponding AC circuit and / or DC circuit based on the voltage value of the access circuit.

[0015] One embodiment of the present invention is a cross-current detection method, executed according to the aforementioned cross-current detection device including a safety protection module, comprising the following steps: All AC and / or DC circuits to be tested are connected to the multi-detection channel module at once; The central control module acquires the wiring information of the AC circuit and / or DC circuit with the multi-detection channel module; The central control module establishes an electrical connection between the safety protection module and the voltage detection module, and then measures the current voltage value of the corresponding AC circuit and / or DC circuit. If the current voltage value of the AC circuit and / or DC circuit is higher than the set safety voltage value, the central control module controls the multi-detection channel module to be locked in the disconnected state. The central control module controls the multiplexer module and establishes an electrical connection between the AC voltage detection circuit and / or the DC voltage detection circuit and the central control module. After the electrical connection is established, the central control module switches the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence, and obtains the access circuit voltage value measured by the corresponding AC voltage detection circuit and / or DC voltage detection circuit. The central control module determines whether there is cross-current between the corresponding AC circuit and / or DC circuit based on the voltage value of the access circuit.

[0016] Compared with the prior art, the current leakage detection device and method of the present invention can select or set the number of DC detection channels and / or AC detection channels to be connected at one time according to the wiring requirements of the detection circuit. After connection, the voltage between each circuit is automatically measured and the current leakage detection results are output. The detection process does not require manual disconnection and reconnection in the middle, avoiding the problem of missed items and missed detections caused by repeated manual disconnection and reconnection. It also avoids the risk of electric shock and equipment damage caused by repeated disconnection and reconnection of power supply, improves work efficiency and reduces working time. Attached Figure Description

[0017] Figure 1 This is a structural framework diagram of one embodiment of the crosscurrent detection device of the present invention.

[0018] Figure 2 This is a flowchart of one embodiment of the crosscurrent detection method of the present invention.

[0019] Figure 3 This is a flowchart of another embodiment of the crosscurrent detection method of the present invention.

[0020] Figure 4 for Figure 3 The logic diagram for determining whether there is a cross-current problem using the cross-current detection method. Detailed Implementation

[0021] Referring to the illustrations, the principles of the invention are illustrated by way of example implementation in a suitable operating environment. The following description is based on the illustrative specific embodiments of the invention and should not be construed as limiting the invention to other specific embodiments not detailed herein.

[0022] As used herein, the terms “component,” “module,” “system,” “interface,” “process,” etc., generally refer to a relevant entity in a computer or embedded electronic device: hardware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable application, an executing thread, a program, and / or a computing unit. As illustrated, both an application running on a controller and the controller itself can be components. One or more components may reside within an executing process and / or thread, and components may be located on a single computer and / or distributed across two or more computers.

[0023] Furthermore, the claimed subject matter can be implemented as a method, apparatus, or article of manufacture that uses standard programming and / or engineering techniques to produce software, firmware, hardware, or any combination thereof to control a computer to implement the disclosed subject matter. As used herein, the term "article of manufacture" is intended to include computer programs accessible from any computer-readable device, carrier, or medium. Of course, those skilled in the art will recognize that many modifications can be made to this configuration without departing from the scope or spirit of the claimed subject matter.

[0024] Although not required, embodiments are described within the general context of "computer-readable instructions" being executed by one or more electronic devices. Computer-readable instructions can be distributed via computer-readable media. Computer-readable instructions can be implemented as program modules, such as functions, objects, application programming interfaces (APIs), data structures, etc., that perform specific tasks or implement specific abstract data types. Typically, the functionality of such computer-readable instructions can be freely combined or distributed in various environments.

[0025] This document provides various operations of the embodiments. In one and / or more embodiments, one or more of the operations may constitute computer-readable instructions stored on one or more computer-readable media, which, when executed by an electronic device, will cause a computing device to perform the operations. The order in which some or all of the operations are described should not be construed as implying that these operations must be sequentially related. Those skilled in the art will understand alternative orderings that have the benefits of this specification. Moreover, it should be understood that not all operations are required to be present in every embodiment provided herein.

[0026] Furthermore, the term "preferred" as used herein is intended to refer to an example, illustration, or illustration. Any aspect or design described herein as "preferred" need not be construed as being more advantageous than other aspects or designs. Rather, the use of the term "preferred" is intended to present the concept in a concrete manner. The term "or" as used in this application is intended to mean an inclusive "or" rather than an exclusionary "or." That is, unless otherwise specified or clear from the context, "X uses A or B" naturally includes either of the permutations. Specifically, if X uses A; X uses B; or X uses both A and B, then "X uses A or B" is satisfied in any of the foregoing examples.

[0027] Furthermore, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components (e.g., elements, resources, etc.), the terminology used to describe such components is intended to correspond to any component (unless otherwise indicated) that performs the specified function of said component (e.g., is functionally equivalent to it), even if structurally not equivalent to the disclosed structure that performs the function in the exemplary implementation of this disclosure shown herein. Moreover, although a particular feature of this disclosure has been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of other implementations that may be desirable and advantageous for a given or particular application. Furthermore, with regard to the use of the terms “comprising,” “having,” “containing,” or variations thereof in the Detailed Description or claims, such terms are intended to be included in a manner similar to the term “including.”

[0028] It should be noted that when an element is considered to be "connected" to another element, it can be a direct connection to the other element or there may be an intervening element; it can also be a mechanical and / or communicative and / or electrical connection; and it can be a fixed and / or movable and / or detachable connection. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the existing technology, the inspection of cross-current in the secondary circuit still relies on the use of various types of testing instruments, including multimeters, resistance testers, relay protection testers, and DC power supplies, by the testing personnel. They need to draw power to the secondary circuit separately, repeatedly disconnect and reconnect wires to switch the measurement objects one by one to determine whether there is cross-current. This is inefficient and poses safety hazards.

[0030] Example 1 Please refer to Figure 1 . Figure 1 This is a structural framework diagram of one embodiment of the current leakage detection device of the present invention. The current leakage detection device of this embodiment includes a central control module, a detection power supply module, a rectification and voltage regulation module, a multiplexer module, a voltage detection module, a multi-detection channel module, a human-machine interaction module, and a safety protection module.

[0031] The central control module is connected to the detection power supply module, the rectifier voltage regulation module, and the multiplexer module, respectively. The multiplexer module, the voltage detection module, and the multi-detection channel module are connected sequentially. The human-machine interface module is connected to the central control module. The safety protection module is connected to the voltage detection module and the central control module, respectively. In this embodiment, unless otherwise specified, the term "connection" refers to an electrical connection. In other possible embodiments of the present invention, the "connection" between the voltage detection module, the central control module, and the human-machine interface module can also refer to the communication connection between the built-in wireless transceiver circuits of each module.

[0032] The multi-detection channel module includes an AC detection channel and a DC detection channel. The AC detection channel is used to connect to the AC circuit to be detected, and the DC detection channel is used to connect to the DC circuit to be detected. In a preferred embodiment, one AC detection channel is configured as a two-phase circuit, specifically consisting of two conductors and corresponding terminals. One DC detection channel consists of two conductors, a positive wire and a negative wire, each with its own terminals. In this embodiment, DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D are provided. Preferably, the detection capability of the DC detection channel is between 50V and 60V DC voltage.

[0033] The voltage detection module is equipped with an AC voltage detection circuit and a DC voltage detection circuit; the AC voltage detection circuit is connected to the AC detection channel, and the DC voltage detection circuit is connected to the DC detection channel.

[0034] One or more DC voltage detection circuits and / or AC voltage detection circuits are provided; corresponding DC detection channels and / or AC detection channels are provided. Specifically, one DC voltage detection circuit is electrically connected to only one DC detection channel, and one AC voltage detection circuit is electrically connected to only one AC detection channel. In this embodiment, the AC voltage detection circuit may selectively employ one or more of the following, depending on the circuit being detected: direct meter connection circuit, current transformer connection circuit, RC voltage divider circuit, and non-contact circuit. The DC voltage detection circuit may selectively employ one or more of the following, depending on the circuit being detected: voltage divider circuit, voltage follower circuit, and differential amplifier circuit.

[0035] In this embodiment, it is preferred to provide one AC detection channel and three DC detection channels. Correspondingly, an AC voltage detection circuit, a DC voltage detection circuit A, a DC voltage detection circuit B, and a DC voltage detection circuit C are provided to realize the detection functions of DC crosstalk and AC / DC crosstalk.

[0036] The multiplexer module includes at least two relays; the relays are connected to either an AC voltage detection circuit or a DC voltage detection circuit, specifically, the number of relays is the same as the combined number of DC voltage detection circuits and AC voltage detection circuits. Figure 1As shown, in this embodiment, four relays are preferably provided. Relays A, B, and C are connected sequentially to DC voltage detection circuits A, B, and C, respectively, while relay D is connected to an AC voltage detection circuit. Specifically, the input contacts of the relays are connected to either the AC or DC voltage detection circuit, and the output and controlled contacts of the relays are connected to the central control module. In other embodiments, the multiplexer module can be other types of controllable electrical / electronic switching components. The selection of specific controllable electrical / electronic switching components only needs to meet the specific detection requirements. Each controllable electrical / electronic switching component is also equipped with a separate LED indicator circuit to indicate the on / off state of the component.

[0037] The power supply module for testing includes at least one AC power source, and the rectifier and voltage regulation module includes at least one AC-to-DC conversion circuit. The power supply module for testing is connected to the rectifier and voltage regulation module. The power supply module for testing outputs AC power to the AC voltage detection circuit and the rectifier and voltage regulation module. The rectifier and voltage regulation module outputs DC power to the DC voltage detection circuit. The rectifier and voltage regulation module consists of a rectifier circuit and a voltage regulation circuit. In this embodiment, the power supply module for testing is preferably an AC power source with a total power of 2500W and a voltage of 220V, and the rectifier and voltage regulation module converts the AC power source into a DC power source with a power of 2500W and an adjustable voltage range of 110V-220V.

[0038] The central control module is used to control whether the output of the power supply module for detection is introduced into the voltage detection module, to control whether the output of the rectifier voltage regulation module is introduced into the voltage detection module, to control the on / off state of the multiplexer module, and to determine whether there is cross-current between the AC circuit and / or DC circuit based on the voltage value of the connected circuit.

[0039] The central control module includes a power relay module. This power relay module connects to the detection power supply module, the rectifier and voltage regulator module, and the multiplexer module; it also connects to multiple relays. The AC power supply to the detection power supply module and the rectifier and voltage regulator module of the detection power supply module are connected to the output contacts of the relays via the power relay module.

[0040] In this embodiment, the central control module preferably includes a processing module; the processing module is connected to the controlled contacts of the relay and is used to control the on / off state of the relay; the processing module is connected to the power relay module and is used to control the power relay module to select the power module for connection detection and / or the rectifier voltage regulation module; the processing module is connected to the output contacts of the relay and is used to collect the access circuit voltage measured by the voltage detection module during crosscurrent detection to obtain the access circuit voltage value; the processing module is connected to the human-machine interaction module and is used to receive detection commands sent by the human-machine interaction module.

[0041] In this embodiment, the central control module is a programmable logic controller (PLC), and the power relay module and the processing module are integrated in the PLC; in other embodiments, the power relay module can be an AC / DC hybrid controlled power switching circuit, and the processing module can be composed of a CPU and / or an MCU in conjunction with a corresponding software system.

[0042] The human-machine interaction module is connected to the program processing module in the central control module. The human-machine interaction module is used to send detection commands to the program processing module. The human-machine interaction module is equipped with a detection loop setting unit, which is used to set the detection commands for controlling the on / off state of the multiplexer module.

[0043] In this embodiment, the preferred human-machine interaction module is a touch display module. The detection circuit setting unit is configured to generate detection commands via virtual buttons. These virtual buttons can generate commands including channel selection, detection sequence, detection duration, start, and stop parameters. The program processing module transmits the result of the current leakage determination to the touch display module's screen for visual alarm. For example, a multi-way switch module can be configured to sequentially connect the AC and DC detection channels in a specific order. Then, the start virtual button is pressed, and the detection command is sent to the program processing module to control the corresponding relays, AC power supply, and DC power supply. The program processing module then reads the corresponding access circuit voltage value to detect which specific circuits between the DC and AC / DC circuits have current leakage problems. Specifically, the presence of current leakage can be determined by considering the circuit structure of the voltage detection circuit and using the access circuit voltage value. In other embodiments, a buzzer can also be configured for audible alarm.

[0044] The safety protection module is used to acquire the voltage values ​​measured by each voltage detection circuit of the voltage detection module before current leakage detection. When the voltage value exceeds the set safe voltage value, the program processing module controls the corresponding relay on the multiplexer module to be locked in the open state. In this embodiment, the safety protection module is preferably an overvoltage protection circuit connected to the program processing module in the central control module. The data port used by the program processing module to access the voltage detection module during current leakage detection is isolated from the data port used by the program processing module to access the safety protection module before current leakage detection. This isolation in this embodiment is at the level of electrical characteristics. For example, the program processing module is a central processing unit chip of a PLC, which uses different data pins to sample and / or read the voltages detected by the voltage detection module and the safety protection module, thereby isolating them from each other in terms of electrical characteristics. In this embodiment, when the safety protection module acquires a voltage value measured by the voltage detection module that is too large before current leakage detection, and the program processing module determines that it exceeds the set safe voltage value, the program processing module outputs a signal to lock the corresponding relay in the open state.

[0045] In other possible embodiments of the present invention, the safety protection module is a functional software module belonging to the central control module. In this case, the voltage detection module may be further provided with an overvoltage protection circuit and / or a voltage isolation circuit, and then communicate with the safety protection module through the overvoltage protection circuit and / or voltage isolation circuit.

[0046] In other possible embodiments of the present invention, a grounding protection circuit may be introduced to further protect the electrical safety of the entire device. The grounding protection circuit may be a casing ground and / or an overall ground.

[0047] Compared with the prior art, the cross-current detection device in this embodiment can select or set the number of DC detection channels and / or AC detection channels to be connected at one time according to the wiring requirements of the detection circuit. After connection, it automatically measures the voltage between each circuit and outputs the cross-current detection results. The detection process does not require manual disconnection and reconnection in the middle, avoiding the problem of missed items and missed detections that are easily caused by repeated manual disconnection and reconnection operations. It also avoids the risk of electric shock and equipment damage caused by repeated disconnection and reconnection of power supply, improves work efficiency and reduces working time.

[0048] Example 2 Please refer to Figure 2 . Figure 2 This is a flowchart of one embodiment of the crosscurrent detection method of the present invention. The crosscurrent detection method of this embodiment is performed using the crosscurrent detection device described in Embodiment 1 above, and includes the following steps: S1. Based on the actual testing requirements, connect the corresponding circuit to be tested to the corresponding AC testing channel and / or DC testing channel in the multi-testing channel module at one time. For example, in this embodiment, DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D need to be connected to the corresponding AC and DC circuits to be tested, respectively, with the goal of detecting whether there is AC / DC crosstalk between the circuits. S2. Through the human-computer interaction module, set the required parameters for channel selection, detection sequence, and detection duration, and generate corresponding detection instructions; In this embodiment, the specific operation is as follows: the corresponding parameters are set through the virtual buttons of the detection loop setting unit, and then the detection loop setting unit generates a detection command and sends it to the program processing module of the central control module. In step S2, the parameters can be set as follows: the channel selection is set to select DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D. The detection sequence is set to output the detected access circuit voltage in the order of DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D. That is, after the program processing module starts the detection, it needs to control the power relay module to switch the output power between the rectifier voltage regulation module and the detection power module, and make the voltage detection module perform the measurement work in the set sequence. The detection time can be set in the range of 1-10 seconds. Specifically, in this embodiment, the detection time for each access circuit is selected as 2 seconds. S3, the program processing module of the central control module, obtains the wiring status of the AC circuit and / or DC circuit with the multi-detection channel module according to the sent detection command; In step S3, the program processing module generates a corresponding processing program based on the received detection command, so as to control the working status of the power relay module, the multiplexer module and the safety protection module in the future. S4. The safety protection module performs a pre-check; specifically: the program processing module controls the safety protection module to establish an electrical connection path with the voltage detection circuit, and measures the current voltage value of the corresponding access circuit. If the current voltage value of the access circuit is higher than the set safety voltage value, the program processing module controls the relay corresponding to the access circuit to be locked in the open state, and sends an alarm to the display screen to terminate the detection process, thereby avoiding safety risks. If there is no alarm for excessive voltage in the four access circuits, the subsequent steps are executed. In this embodiment, the program processing module will generate a pre-check instruction by default before starting the crosscurrent detection; in other embodiments, whether to perform a pre-check can also be set in the detection circuit setting unit at the beginning. S5. After the pre-inspection result is safe, the program processing module of the central control module controls the corresponding relays of the selected AC detection channel and / or DC detection channel to be in the on state according to the set channel selection parameters, and establishes the electrical connection relationship between the corresponding AC voltage detection circuit and / or DC voltage detection circuit and the program processing module. In step S5, after the pre-detection result is safe, the program processing module controls relays A, B, C, and D to be turned on, and DC voltage detection circuits A, B, C, and D are simultaneously turned on. S6. The program processing module of the central control module starts the process of cross-current detection and controls the power relay module to switch the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence. In this embodiment, the detection command to be started is preferably automatically generated after the detection command is set in the detection loop setting unit. In other embodiments, it can also be set to whether to start manually. S7. Before the end of the detection time for each switch, the program processing module performs voltage measurement on the corresponding access circuit to obtain the access circuit voltage value of the corresponding AC voltage detection circuit and / or DC voltage detection circuit. In step S7, the program processing module controls the power relay module to sequentially introduce the DC power output from the rectifier voltage regulation module into DC detection channels A, B, and C according to the set detection sequence "DC detection channel A - DC detection channel B - DC detection channel C - AC detection channel D". Then, the program processing module controls the power relay module to introduce the AC power output from the detection power module into AC detection channel D. During the introduction of DC and AC power respectively, the program processing module simultaneously acquires the corresponding access circuit voltage value within the set detection time. S8. The central control module determines whether there is cross-current between the corresponding AC circuit and / or DC circuit based on the voltage value of the access circuit. In step S8, when obtaining the voltage value of the corresponding access circuit, if the voltage value of other circuits fluctuates when the program processing module does not have a corresponding power supply, it can be determined that there is cross-current between the corresponding access circuits. For example, when AC power is introduced into AC detection channel D, DC detection channel A, DC detection channel B, and DC detection channel C all show abnormal voltages. It can be determined that there is a problem of AC / DC cross-current between the three DC access circuits and the AC access circuit. S9. When the program processing module detects a cross-current problem, the program processing module outputs an alarm message to the display screen, indicating which connected circuits have cross-current problems.

[0049] Compared with the prior art, the cross-current detection method of this embodiment can automatically measure the voltage between each circuit and output the cross-current detection results in one go, according to the wiring requirements of the detection circuit. The detection process does not require manual disconnection and reconnection in the middle, avoiding the problem of missed items and missed detections that are easily caused by repeated manual disconnection and reconnection operations. It also avoids the risk of electric shock and equipment damage caused by repeated power disconnection and reconnection, thus improving work efficiency and reducing working time.

[0050] Example 3 Please refer to Figure 3 and Figure 4 The cross-current detection method in this embodiment 3 is performed using the cross-current detection device described in embodiment 1, and includes the following steps: S1. Based on the actual testing requirements, connect the corresponding circuits to be tested to DC testing channel A, DC testing channel B, DC testing channel C, and AC testing channel D in one go. In other implementations, it is not necessary to select all of the corresponding detection channels for wiring; S2. Set the detection command through the human-machine interaction module: the channel selection is set to DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D. The detection sequence is set to introduce power to DC detection channel A, DC detection channel B, DC detection channel C, and AC detection channel D in sequence, and the detection time is 1 second. In this embodiment, the detection command mode can also be selected as manual operation in the human-computer interaction module; in other embodiments, the detection order and detection duration can also be selected in other ways. S3. The program processing module of the central control module obtains the wiring status of the AC circuit and / or DC circuit with the multi-detection channel module according to the sent detection command. At this time, the program processing module further checks whether there is a point on the output contact of each relay to determine whether each relay is connected. In other implementations, a security protection module can be enabled for pre-inspection after step S2; S4. The program processing module of the central control module selects parameters according to the set channel and controls relays A, B, C and D to be turned on, and DC voltage detection circuits A, B, C and D are simultaneously turned on. In other implementations, the appropriate voltage detection circuit may be switched on or off depending on the specific wiring configuration and whether the operation is manual. S5. The program processing module of the central control module starts the process of cross-current detection and controls the power relay module to switch the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence. In this embodiment, when the manual operation mode is selected, the program processing module switches the power output of the corresponding detection power module and / or rectifier voltage regulation module, and then executes the manual operation detection command on the human-machine interaction module. S6. Before the end of the detection time for each switch, the program processing module, according to the set detection sequence "DC detection channel A - DC detection channel B - DC detection channel C - AC detection channel D", simultaneously acquires the corresponding access circuit voltage value within the set detection time of the process of introducing DC power and AC power respectively. S7. The central control module judges based on the voltage value of the access circuit. If the voltage value of other circuits fluctuates when the program processing module does not introduce power accordingly, it can be determined that there is cross-current between the corresponding access circuits. S8. When the program processing module detects a cross-current problem, the program processing module outputs an audible and visual alarm to the human-machine interaction module, indicating which connected circuits have cross-current problems.

[0051] Compared with the prior art, the cross-current detection method of this embodiment can automatically measure the voltage between each circuit and output the cross-current detection results in one go, according to the wiring requirements of the detection circuit. The detection process does not require manual disconnection and reconnection in the middle, avoiding the problem of missed items and missed detections that are easily caused by repeated manual disconnection and reconnection operations. It also avoids the risk of electric shock and equipment damage caused by repeated power disconnection and reconnection, thus improving work efficiency and reducing working time.

[0052] Example 4 The present invention provides a storage medium storing an executable program, which, when executed, is used to implement the crosscurrent detection method of the aforementioned embodiment 2 or 3.

[0053] In this embodiment, the executable program of the storage medium is a structured executable code module, and the physical circuit is an array of storage components in the hardware structure of the central control module.

[0054] Although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A current leakage detection device, characterized in that, Includes a central control module, a power supply module for detection, a rectification and voltage regulation module, a multiplexer module, a voltage detection module, and a multi-detection channel module; The central control module is connected to the detection power supply module, the rectifier voltage regulation module, and the multiplexer module, respectively. The multi-channel switch module, the voltage detection module, and the multi-detection channel module are connected in sequence; The multi-channel detection module is equipped with AC detection channels and DC detection channels; The AC detection channel is used to connect to the AC circuit to be detected, and the DC detection channel is used to connect to the DC circuit to be detected. The voltage detection module is equipped with an AC voltage detection circuit and a DC voltage detection circuit; The AC voltage detection circuit is connected to the AC detection channel, and the DC voltage detection circuit is connected to the DC detection channel; The power supply module for testing is connected to the rectifier and voltage regulation module; The central control module is used to control the output of the detection power supply module, the output of the rectifier voltage regulation module, the on / off state of the multiplexer module, and to determine whether there is cross-current between the AC circuit and / or DC circuit.

2. The current leakage detection device according to claim 1, characterized in that, It also includes a human-computer interaction module; The human-computer interaction module is connected to the central control module; The human-computer interaction module is used to send detection commands to the central control module.

3. The current leakage detection device according to claim 2, characterized in that, The human-machine interaction module is equipped with a detection loop setting unit, which is used to set the detection commands for controlling the on / off state of the multi-way switch module.

4. The current leakage detection device according to claim 1, characterized in that, It also includes a security protection module; The safety protection module is connected to the voltage detection module and the central control module respectively; The safety protection module is used to obtain the voltage value measured by the voltage detection module before the cross-current detection. When the voltage value is greater than the set safe voltage value, the central control module locks the multiplexer module to the open state.

5. The current leakage detection device according to claim 4, characterized in that, The safety protection module is an overvoltage protection circuit connected to the central control module; Alternatively, the central control module may include a security protection module.

6. The current leakage detection device according to claim 1, characterized in that, The central control module is equipped with a power relay module; The power relay module is connected to the detection power module, the rectifier voltage regulation module, and the multiplexer module, respectively.

7. The current leakage detection device according to claim 1, characterized in that, The multiplexer module includes at least two relays; The relay is connected to an AC voltage detection circuit or a DC voltage detection circuit.

8. The current leakage detection device according to claim 1, characterized in that, The DC voltage detection circuit and / or AC voltage detection circuit includes one or more components; One or more corresponding DC detection channels and / or AC detection channels are provided.

9. A method for detecting cross-current, performed by the cross-current detection device according to any one of claims 1-8, characterized in that, Including the following steps: All AC and / or DC circuits to be tested are connected to the multi-detection channel module at once; The central control module acquires the wiring information of the AC circuit and / or DC circuit with the multi-detection channel module; The central control module controls the multiplexer module and establishes an electrical connection between the AC voltage detection circuit and / or the DC voltage detection circuit and the central control module. After the electrical connection is established, the central control module switches the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence, and obtains the access circuit voltage value measured by the corresponding AC voltage detection circuit and / or DC voltage detection circuit. The central control module determines whether there is cross-current between the corresponding AC circuit and / or DC circuit based on the voltage value of the access circuit.

10. A method for detecting cross-current, performed by the cross-current detection device according to claim 4 or 5, characterized in that, Including the following steps: All AC and / or DC circuits to be tested are connected to the multi-detection channel module at once; The central control module acquires the wiring information of the AC circuit and / or DC circuit with the multi-detection channel module; The central control module establishes an electrical connection between the safety protection module and the voltage detection module, and then measures the current voltage value of the corresponding AC circuit and / or DC circuit. If the current voltage value of the AC circuit and / or DC circuit is higher than the set safety voltage value, the central control module controls the multi-detection channel module to be locked in the disconnected state. The central control module controls the multiplexer module and establishes an electrical connection between the AC voltage detection circuit and / or the DC voltage detection circuit and the central control module. After the electrical connection is established, the central control module switches the power output of the corresponding detection power module and / or rectifier voltage regulation module according to the set detection sequence, and obtains the access circuit voltage value measured by the corresponding AC voltage detection circuit and / or DC voltage detection circuit. The central control module determines whether there is cross-current between the corresponding AC circuit and / or DC circuit based on the voltage value of the access circuit.

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