Device and method for verifying operation of residual current monitoring device of alternating current system

Abstract

The invention discloses an alternating current system residual current monitoring device operation verification device and method, and belongs to the technical field of residual current monitoring device verification, the verification device comprises a verification control unit, at least one verification unit and at least one verification CT; the verification control unit sends a control instruction to each verification unit according to the expected current of the to-be-verified residual current monitoring device so as to control the verification unit to output the current, and the current output port of each verification unit is short-circuited through the corresponding configured current output wire so that the current output by the verification unit flows through the current output wire. Meanwhile, a current output wire is wound around a current monitoring CT corresponding to the verification unit, so that the current monitoring CT can measure the real-time disturbance current and the output current of the circuit at the same time; and each verification unit measures the real-time disturbance current of the circuit through the correspondingly configured verification CT. The device can be used for operation field calibration, test acceptance and the like of the residual current monitoring device.

Description

Technical Field

[0001] This application belongs to the field of residual current monitoring device verification technology, specifically relating to an AC system residual current monitoring device operation verification device and method. Background Technology

[0002] The principle of the residual current online monitoring device is to monitor the current in the feeder circuit cables of a 400V AC system, perform vector synthesis calculations on the current in each cable of the circuit, and calculate the residual current of the feeder branch. Because the phase lines pass through circuit breakers and the neutral line is directly connected to the neutral busbar during AC system power distribution in substations, the connection points of the phase and neutral lines are usually far apart. Measuring the residual current of an independent feeder branch may require one current transformer (one current transformer directly completes the phase and neutral line current measurements) or two current transformers (one current transformer measures the phase line current, and one current transformer measures the neutral line current). When distributing AC power in station service systems, dual power supply is designed for important loads. To save costs, when switching dual power supplies using an ATS, only the phase lines are switched, and the neutral lines are directly connected in parallel. Measuring the residual current of a dual power supply circuit (commonly known as a common N-branch circuit) requires two to four current transformers.

[0003] For a long time, there has been a lack of technical means to verify the accuracy of residual current measurements by operating residual current monitoring devices. Frontline maintenance personnel can only conduct residual current troubleshooting and maintenance work when equipment alarms occur. Often, the residual current measurement accuracy is insufficient, and maintenance personnel usually adjust the alarm value to be large enough to prevent the equipment from alarming. Even worse, in some cases, the equipment technology is inadequate, and simultaneous measurements by multiple current transformers (CTs) fail to meet requirements, resulting in random fluctuations in the vector synthesis of measurement data. In such cases, maintenance personnel have no choice but to disable the equipment alarm and abandon the monitoring device. Therefore, power production sites urgently need a residual current monitoring device verification device that can verify and accept the equipment after its implementation, ensuring that the monitoring device is accurately measuring residual current during system operation, and reducing the daily maintenance workload of maintenance personnel.

[0004] Currently, existing calibration devices for residual current monitoring systems verify the equipment by outputting a current source with adjustable phase and amplitude, measuring its own output current, and comparing it with the measured value of the device to be calibrated. However, these devices are only suitable for routine inspections of residual current measurement equipment in laboratories and cannot be used for on-site calibration of equipment during system operation. Summary of the Invention

[0005] To address the problems existing in the prior art, this application proposes an operation verification device and method for residual current monitoring devices in AC systems. This method can be used for on-site verification, testing, and acceptance of residual current monitoring devices, ensuring that the operating residual current monitoring devices are in a state of accurate residual current measurement, and providing technical support for the safe and stable operation of power production.

[0006] This application is achieved through the following technical solution:

[0007] An operation verification device for residual current monitoring of an AC system includes: a verification control unit, at least one verification unit, and at least one verification CT.

[0008] The number of verification units and verification CTs is the same as the number of current monitoring CTs in the residual current monitoring device to be verified.

[0009] The verification control unit sends control commands to each verification unit according to the expected current of the residual current monitoring device to be verified, so as to control its output current. The current output port of each verification unit is shorted through its corresponding configured current output wire so that the current output of the verification unit flows through the current output wire. At the same time, the current output wire is bypassed around the current monitoring CT corresponding to the verification unit so that the current monitoring CT can simultaneously measure the real-time disturbance current of the line and the current output of the verification unit.

[0010] Each verification unit measures the real-time disturbance current of the line using a corresponding configured verification CT;

[0011] The verification control unit is communicatively connected to the residual current monitoring device to be verified.

[0012] In some implementations, the verification control unit can obtain a standard current for acceptance and compare it with the current measurement value output by the residual current monitoring device to be verified, thereby completing the acceptance of the residual current monitoring device to be verified. The standard current for acceptance is obtained by vector synthesis of the currents returned by each verification unit, and the current returned by each verification unit is the vector synthesis current of its output current and the real-time disturbance current of the line measured by the corresponding configured verification CT.

[0013] In some implementations, the verification control unit calculates the target current output by each verification unit based on the expected current and the output ratio, and issues corresponding control commands to each verification unit.

[0014] In some implementations, each of the verification units dynamically adjusts its output current based on the measured real-time disturbance current of the line and the target current.

[0015] Secondly, this application proposes a verification method based on any embodiment of the above-mentioned AC system residual current monitoring device operation verification device, including:

[0016] The calibration parameters are matched according to the residual current monitoring device to be calibrated;

[0017] Control the output current value of each verification unit, and repeat this step until the current output is stable.

[0018] The communication informs the device under test of the stable output of the residual current monitoring device and receives the completion status of the current acquisition and storage of the residual current monitoring device under test;

[0019] Determine whether all verification point current outputs have been completed. If so, the verification is complete; otherwise, return to the step of controlling the output current value of each verification unit to perform the next verification point current output.

[0020] In some embodiments, the matching and verification parameters based on the residual current monitoring device to be verified include:

[0021] Based on the residual current monitoring device to be verified, obtain the expected current of all verification points, and match the number of CTs to be verified and the ratio of CT detection current to the verification branch.

[0022] In some implementations, controlling the output current value of each verification unit includes:

[0023] The target current output by each verification unit is calculated based on the ratio of the expected current at the current verification point to the CT detection current. The target current is equal to the product of the expected current and the ratio of the CT detection current.

[0024] Based on the real-time disturbance current of the line measured by the corresponding verification CT of each verification unit, the phase and amplitude of the output current of the verification unit are controlled in combination with the target current to ensure that the target current is equal to the vector sum of the real-time disturbance current of the line and the output current.

[0025] Once the output current of the verification unit stabilizes, a signal indicating that the output current of the verification control unit has stabilized is returned.

[0026] In some embodiments, the communication informing the residual current monitoring device under test of its stable output and receiving the completion status of current acquisition and storage from the residual current monitoring device under test includes:

[0027] After receiving the signal that all verification units have stabilized their output current, a stable output signal is sent to the residual current monitoring device to be verified. After receiving the stable output signal, the residual current monitoring device to be verified starts to collect the current and stores its corresponding AD value in the register. After completing the collection and storage, it sends a completion signal back to the verification control unit.

[0028] Thirdly, this application proposes a verification method based on any embodiment of the above-mentioned AC system residual current monitoring device operation verification device, including:

[0029] Configure the phase and amplitude of the output current of each verification unit;

[0030] After configuration is complete, control commands are sent to each verification unit;

[0031] The verification unit outputs a current with corresponding phase and amplitude according to the control command, and determines whether the current is output stably. If it is, it proceeds to the next step; otherwise, it adjusts the output current.

[0032] After the current is stabilized, the verification unit performs vector synthesis calculation based on the output current and the real-time disturbance current of the line measured by the verification CT configured in the verification unit to obtain the final current through which the corresponding current monitoring CT passes and transmits it to the verification control unit.

[0033] The verification control unit determines whether the current returned by each verification unit exceeds the range. If so, it issues an early warning; otherwise, it performs vector synthesis calculation on the current returned by all verification units to obtain the total current.

[0034] The inspection and control unit compares the total current with the measurement results of the residual current monitoring device to be inspected and outputs the error value to complete the acceptance.

[0035] In some implementations, the verification control unit determines whether the current returned by each verification unit exceeds the range, including:

[0036] Each verification unit is checked to see if the current returned is greater than the measurement threshold of the corresponding current monitoring CT. If it is greater, an over-range message or invalid acceptance data is displayed. The measurement threshold is the maximum current that can be measured, determined before acceptance based on the measurement range of the current monitoring CT of the residual current monitoring device to be verified.

[0037] This application proposes a device and method for verifying the operation of residual current monitoring devices in AC systems. By verifying the line disturbance current measured by the current transformer (CT), the target current output of the verification unit is dynamically adjusted based on this disturbance current to meet the desired current required by the residual current monitoring device under verification. This ensures that the device is in a state of accurate residual current measurement, thus preventing it from being affected by system operation. Based on this, the measurement accuracy is reliably verified. This verification device can not only calibrate residual current detection equipment in an ideal laboratory environment but also perform on-site verification and testing of residual current monitoring devices, ensuring that the operating equipment is in a state of accurate measurement. It enables accurate alarms for residual current faults in 400V AC substation systems, providing technical support for the safe and stable operation of power systems. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of this application. In the drawings:

[0039] Figure 1 This is a schematic diagram of the verification device structure proposed in the embodiments of this application;

[0040] Figure 2 This is a schematic flowchart of the verification method for the first example proposed in the embodiments of this application;

[0041] Figure 3 This is a schematic diagram of the verification method flow for the second example proposed in the embodiments of this application. Detailed Implementation

[0042] In the following, the terms “comprising” or “may include” as used in the various embodiments of this application indicate the presence of a function, operation, or element of the invention and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.

[0043] In various embodiments of this application, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0044] The terms used in the various embodiments of this application (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above terms do not limit the order and / or importance of the elements. The above terms are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0045] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0046] The terminology used in the various embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments of this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. The terms (such as those defined in a generally used dictionary) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0048] The residual current monitoring device for the distribution branch of the 400V AC system used in the station typically uses 1-4 current transformers (CTs) to measure the current of the corresponding circuit, and then performs vector synthesis calculation on all the measured currents to obtain the residual current. To enable on-site verification of residual current monitoring devices in 400V AC power distribution branches of a station service system, this application proposes an operational verification device for residual current monitoring devices in AC systems. This verification device includes a verification control unit, at least one verification unit, and at least one verification current transformer (CT). The number of verification units and CTs is the same as the number of current monitoring CTs (CTs to be verified) in the 400V AC power distribution system residual current monitoring device (i.e., the residual current monitoring device to be verified). The verification control unit sends control commands to each verification unit based on the desired current of the residual current monitoring device to be verified, controlling its output current. The current output ports of each verification unit are short-circuited by correspondingly configured current output wires (i.e., one end of the current output wire is connected to the positive terminal of the current output terminal of the verification unit, and the other end is connected to the negative terminal of the current output terminal of the verification unit, and the current output wire bypasses the current monitoring CT), allowing the target output current to flow through the current output wire. Simultaneously, the current output wire bypasses the CT to be verified corresponding to the verification unit, allowing the CT to simultaneously measure the real-time disturbance current and output current of the line. Each verification unit measures the real-time disturbance current of the line through its correspondingly configured CT. Figure 1A schematic diagram of a verification device architecture including four verification units and four verification current transformers (CTs) is shown. As shown in the figure, the verification control unit is communicatively connected to the four verification units and to the residual current monitoring device to be verified. The target current output of the four verification units is determined based on the expected current of the residual current monitoring device to be verified. The current output port of each verification unit is short-circuited by its corresponding configured current output wire, which bypasses the CT to be verified on the corresponding line. At the same time, each verification unit measures the real-time disturbance current (i1', i2', i3', or i4') on the corresponding line through its corresponding configured verification CT (i.e., CT1', CT2', CT3', or CT4'). Each verification unit dynamically adjusts its output current (i.e., i1'', i2'', i3'', or i4'') based on the real-time disturbance current measured by its corresponding configured verification CT and the target current determined by the verification control unit. This ensures that the current measured by the CT to be verified (CT1, CT2, CT3, or CT4) ultimately conforms to the expected current and is not affected by the disturbance current.

[0049] Optionally, the verification control unit is communicatively connected to the residual current monitoring device to be verified (via RS485 bus communication), and can obtain the acceptance standard current (obtained by vector synthesis of the currents returned by each verification unit, wherein the current returned by each verification unit is the vector synthesis current of its output current and the real-time disturbance current of the line measured by the corresponding configured verification CT), and compare it with the current measurement value (i.e. the measured value) output by the residual current monitoring device to be verified, thereby completing the acceptance of the residual current monitoring device to be verified.

[0050] Optionally, the verification control unit calculates the target current output by each verification unit based on the desired current and the output ratio, and sends corresponding control commands to each verification unit.

[0051] Optionally, each verification unit dynamically adjusts its output current based on the measured real-time disturbance current and the target current issued by the verification control unit.

[0052] Optionally, the verification control unit communicates with each verification unit via an RS485 bus.

[0053] It should be noted that the residual current monitoring device to be calibrated consists of a main unit and a current monitoring CT. The current monitoring CT is installed on the operating cable (based on the residual current monitoring principle of a 400V AC system, there are 1-4 current monitoring CTs). The operating AC system may have residual currents or zero-sequence currents due to unbalanced currents, grounding faults, etc., which may cause disturbance currents in the cable where the current monitoring CT is installed, and these disturbance currents fluctuate randomly. Therefore, the calibration device proposed in this application measures the line disturbance current by calibrating the CT, and dynamically adjusts the target current output by the calibration unit according to the disturbance current to meet the expected current required by the residual current monitoring device to be calibrated. This ensures that the operating residual current monitoring device to be calibrated is in a state of accurate residual current measurement, so that the residual current monitoring device to be calibrated is not affected by the system operation, and on this basis, its measurement accuracy is reliably verified.

[0054] Furthermore, embodiments of this application also propose a verification method based on the above-described verification device, such as... Figure 2 As shown, the verification method includes the following steps:

[0055] Step 101: Match the calibration parameters according to the residual current monitoring device to be calibrated;

[0056] Step 102: Control the output current of each verification unit and repeat this step until the current output is stable.

[0057] Step 103: Inform the device under test of the stable output of the residual current monitoring device and receive the completion status of current acquisition and storage from the device under test of the residual current monitoring device.

[0058] Step 104: Determine whether all verification point current outputs have been completed. If so, the verification is complete; otherwise, return to step 102 to perform the next verification point current output.

[0059] Furthermore, in step 101 of this application embodiment, the verification parameter matching method includes:

[0060] Based on the residual current monitoring device to be calibrated, obtain the expected current at all calibration points. Match the calibration branch with the number of current transformers (CTs) to be calibrated (1-4). The CT detection current ratio (used to control the current ratio of each CT to be calibrated when using multiple CT channels) is set. The CT detection current ratio is set to a constant output by default, but different ratios can be adjusted. Adjusting the first parameter automatically changes the ratio of subsequent CTs. Adjusting intermediate parameters keeps the ratio of the first CTs unchanged while automatically changing the ratio of subsequent CTs. An error is indicated when the adjusted ratio exceeds 100%. For example, with 4 CTs to be calibrated (current monitoring CTs), the default detection current ratio of each CT is 25%. If the ratio of the first CT is adjusted to 30%, the ratio of the subsequent three will automatically change to 23.33%. If the ratio of the second CT is adjusted to 30%, the first remains unchanged, while the subsequent two automatically change to 20%. Therefore, the adjusted parameters are: 30%, 30%, 20%, 20%.

[0061] Furthermore, in step 102 of this application embodiment, the verification control unit calculates the target current output by each verification unit based on the ratio of the expected current at the current verification point to the CT detection current. The target current value is equal to the product of the expected current and the ratio of the CT detection current.

[0062] The verification unit, based on the disturbance current measured by its corresponding verification CT and in conjunction with the target current, controls the phase and amplitude of the output current to ensure that the target current equals the vector sum of the disturbance current and the output current. In other words, by dynamically controlling the output current, the current measured by the CT under verification is made equal to the target current value. Once the output current stabilizes (i.e., the vector sum of the output current of the verification unit and the disturbance current equals the target current), a signal indicating that the output current has stabilized is returned to the verification control unit.

[0063] Furthermore, in step 103 of this application embodiment, after the verification control unit receives the signal that all verification units have stabilized their output current, it displays a stable output on the interface and sends a stable output signal to the remaining current monitoring device to be verified. The remaining current monitoring device to be verified can then collect the current (i.e., the vector synthesis of the output current of all verification units and the disturbance current), store the corresponding AD value in the register, and after the device completes the collection and storage, it sends a completion signal back to the verification control unit.

[0064] Furthermore, this application also proposes a verification method based on the above-mentioned verification device for testing and accepting a residual current monitoring device. Before acceptance, the maximum measurable current is first determined according to the measurement range of the current monitoring CT (i.e., the CT to be verified) of the residual current monitoring device to be verified, to avoid the measurement results being affected by the acceptance output current exceeding the range of the device to be verified. The acceptance process involves controlling the current flowing through each branch current monitoring CT of the residual current monitoring device to check whether the measurement of the residual current monitoring device is accurate, specifically as follows: Figure 3 As shown, the verification method includes the following steps:

[0065] Step 201: Configure the phase and amplitude of the output current of each verification unit; the parameters of the test current are configured according to actual needs, that is, the phase and amplitude of the output current of the verification unit are configured according to the test current.

[0066] Step 202: After completing the configuration, send control commands to each verification unit;

[0067] Step 203: Verify the unit output current and determine whether the current is stable (i.e., whether the output current meets the configuration parameter requirements). If yes, proceed to the next step; otherwise, adjust the phase and amplitude of the output current until the output current meets the configuration parameter requirements.

[0068] Step 204: The verification unit performs vector synthesis calculation based on the output current and the real-time disturbance current of the line measured by the corresponding verification CT, and transmits it to the verification control unit.

[0069] Step 205: The verification control unit determines whether the current returned by each verification unit exceeds the range. If so, an early warning is issued; otherwise, the current returned by all verification units is vector synthesized to obtain the total current.

[0070] Step 206: The verification control unit compares the total current with the measurement results of the residual current monitoring device to be verified and outputs the error value to complete the acceptance.

[0071] Furthermore, in step 204 of this application embodiment, the corresponding verification CT configured for each verification unit measures the real-time disturbance current of the corresponding line, and performs vector synthesis operation (i.e. complex number operation, including amplitude and phase relationship) on the line disturbance current and the output current after the verification unit is stabilized, thereby obtaining the final current and transmitting it to the verification control unit in real time.

[0072] Furthermore, in step 205 of this embodiment, the over-range determination process includes:

[0073] The verification control unit determines whether the current returned by each verification unit is greater than the measurement threshold (i.e., maximum current) of the corresponding CT to be verified. If it is greater, it prompts that the measurement range is exceeded and the acceptance data is invalid. If it is less than or equal to, it performs vector synthesis operation on the current returned by all verification units to obtain the total current. This total current is the test current (i.e., ideal value) applied to the residual current monitoring device to be verified.

[0074] Furthermore, in step 206 of this application embodiment, the verification control unit compares the total current (i.e., the ideal value) with the measurement result (i.e., the actual measurement value) of the residual current monitoring device to be verified to obtain the error value between the two. The error value reflects the measurement accuracy of the residual current monitoring device to be verified. The larger the error value, the lower the measurement accuracy, and the smaller the error value, the higher the measurement accuracy.

[0075] It is understandable that the measurement results of the residual current monitoring device to be calibrated are obtained by collecting the current values ​​measured by each current monitoring CT (i.e., the CT to be calibrated) and performing vector synthesis calculations.

[0076] The verification device and method proposed in this application can not only verify residual current monitoring equipment in an ideal laboratory environment, but also effectively verify residual current monitoring devices in operation (i.e., realize on-site verification, test acceptance, etc.) to ensure that the operating equipment is in a precise measurement state, and that the 400V AC system for station use can realize accurate alarm of residual current fault, providing technical support for the safe and stable operation of the power system.

[0077] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0078] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0079] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0080] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0081] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An alternating current system residual current monitoring device operational verification apparatus, characterised in that, The application relates to a residual current monitoring device test system, comprising: a check control unit, at least one check unit and at least one check CT; the number of the check units and the check CTs is the same as the number of current monitoring CTs of a residual current monitoring device to be checked; the check control unit sends a control instruction to each check unit according to expected current of the residual current monitoring device to be checked to control the output current of each check unit, the current output port of each check unit is short-circuited through the corresponding configured current output lead wire to make the current output lead wire flow with the output current of the check unit, and the current output lead wire bypasses the corresponding current monitoring CT of the check unit to make the current monitoring CT simultaneously measure the real-time disturbance current of the line and the output current of the check unit; each check unit measures the real-time disturbance current of the line through the corresponding configured check CT; the check control unit is in communication connection with the residual current monitoring device to be checked.

2. An operating check device for an alternating current system residual current monitoring device according to claim 1, characterized in that The check control unit can obtain standard current for acceptance and compare the standard current with the measured current output by the residual current monitoring device to be checked to complete the acceptance of the residual current monitoring device to be checked; the standard current for acceptance is obtained by vector synthesis of the currents returned by the check units, and the current returned by each check unit is the vector synthesis current of the output current and the real-time disturbance current of the line measured by the corresponding configured check CT.

3. An operating verification device for an alternating current system residual current monitoring device according to claim 1, characterized in that, The check control unit calculates the target current output by each check unit according to the expected current and an output ratio and sends corresponding control instructions to each check unit.

4. An operating check device for an alternating current system residual current monitoring device according to claim 3, characterized in that Each check unit dynamically adjusts the output current according to the measured real-time disturbance current of the line and the target current.

5. A method of verifying the operation of a verification device for an alternating current system residual current monitoring device according to any one of claims 1 to 4, characterized in that, The application relates to a residual current monitoring device test system, comprising: matching check parameters according to the residual current monitoring device to be checked; controlling the output current value of each check unit, and repeating the step until the current is stably output; communicating to the residual current monitoring device to be checked that the current is stably output and receiving the completion of current collection and storage of the residual current monitoring device to be checked; judging whether the current output of all check points is completed, and if yes, completing the check, otherwise returning to the step of controlling the output current value of each check unit to perform the current output of the next check point.

6. The method of claim 5, wherein, The matching check parameters according to the residual current monitoring device to be checked comprise: obtaining all expected currents of check points, matching the number of CTs to be checked and the CT detection current ratio according to the residual current monitoring device to be checked.

7. The method of claim 6, wherein, The controlling the output current value of each check unit comprises: calculating the target current output by each check unit according to the expected current of the current check point and the CT detection current ratio, wherein the target current is equal to the product of the expected current and the CT detection current ratio; controlling the phase and amplitude of the output current of each check unit according to the real-time disturbance current of the line measured by the corresponding configured check CT of each check unit and the target current to ensure that the target current is equal to the vector sum of the real-time disturbance current of the line and the output current; returning the signal of the stably output current of the check control unit after the output current of the check unit is stably output.

8. The method of claim 5, wherein, The communication informs the remaining current monitoring device to be checked that the output is stable and receives the completion of current collection and storage of the remaining current monitoring device to be checked, including: After receiving the signal that all check units have stably output current, a stable output signal is sent to the remaining current monitoring device to be checked. After receiving the stable output signal, the remaining current monitoring device to be checked starts to collect the current and stores the corresponding AD value in the register. After completing the collection and storage, a completion signal is fed back to the check control unit.

9. A method of verifying the operation of a verification device for an alternating current system residual current monitoring device according to any one of claims 1 to 4, characterized in that, Including: The phase and amplitude of the output current of each check unit are configured; After the configuration is completed, control instructions are issued to each check unit; The check unit outputs current with corresponding phase and amplitude according to the control instructions, and judges whether the current is stably output. If yes, it enters the subsequent step, otherwise it adjusts the output current; After the current is stably output, the check unit performs vector synthesis calculation on the output current and the line real-time disturbance current measured by the check CT corresponding to the check unit to obtain the final current passed by the corresponding current monitoring CT and transmits it to the check control unit; The check control unit judges whether the current returned by each check unit is out of range. If yes, a pre-warning is given, otherwise the currents returned by all check units are vector synthesized to obtain the total current; The test control unit compares the total current with the measurement result of the remaining current monitoring device to be checked and outputs the error value, completing the acceptance.

10. The method of claim 9, wherein, The check control unit judges whether the current returned by each check unit is out of range, including: Respectively judge whether the current returned by each check unit is greater than the measurement threshold of the corresponding current monitoring CT. If yes, it is out of range and the acceptance data is invalid. The measurement threshold is the maximum current that can be measured according to the measurement range of the current monitoring CT of the remaining current monitoring device to be checked before acceptance.

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