Three-phase electric energy meter full fault simulation device and method

Abstract

The invention relates to the technical field of electric energy metering, in particular to a full-fault simulation device and method for a three-phase electric energy meter, and the method comprises the steps: a fault simulation unit determines the type of a simulated fault, outputs a corresponding fault simulation parameter based on a preset fault parameter mapping table, and analyzes a received measurement value; the analog simulation unit is of a multi-layer PCB structure, and simulates and outputs a corresponding fault simulation signal to the false meter tail end subunit according to the fault simulation parameter; the false meter tail end subunit is provided with a standard terminal layout corresponding to a three-phase four-wire system metering device and a three-phase three-wire system metering device, and a fault simulation signal is accessed; the measurement unit measures a weak current measurement value at the false meter tail end subunit. The full-fault simulation device for the three-phase electric energy meter integrates single board integration, fault simulation and weak current simulation, adopts 5V / 10mA weak current signals, thoroughly eliminates the strong current electric shock risk, meets the electrical safety standard, realizes lightweight design by utilizing single board integration, is high in single-person portability, and adapts to outdoor / grassroots scenes.

Description

Technical Field

[0001] This invention relates to the field of electricity metering technology, specifically a three-phase electricity meter full fault simulation device and method. Background Technology

[0002] When power companies conduct power training for their personnel, they need to use power metering and analysis equipment to simulate various faults that may occur in power metering devices such as electricity meters, in order to meet the training requirements for fault analysis of power metering devices.

[0003] Currently, traditional power metering error wiring simulation devices generally adopt an architecture combining virtual load power supplies and fault switching modules. Their voltage output range covers multiple levels, including 57.7V, 220V, and 380V, all exceeding the safe voltage limits specified in the "Low-Voltage Power Distribution Design Code" (GB50054). Although these devices are equipped with multiple protection mechanisms such as overvoltage protection, overcurrent protection, and leakage protection, the following key problems still exist in actual operation: Significant safety hazards: Traditional devices use high-voltage signals (220V / 380V) for simulation. Although they are equipped with protection mechanisms, there is still a risk of electric shock, short circuit, and fire. This does not meet the safety requirements for training equipment in the "Electric Power Safety Work Regulations". Poor portability: Using virtual load power supply plus fault switching module, communication module, etc., the volume is generally >0.5m² and the weight is >100kg, making transportation and on-site deployment difficult and unable to meet the decentralized training needs of grassroots power supply stations; Low integration: The voltage and current generation modules and fault switching modules are set up independently, resulting in many hardware components, which leads to system complexity and high cost; Limited fault coverage: Due to the limitations of hardware switching logic, it can only simulate simple faults (such as single phase sequence error) and cannot reproduce multiple types of complex faults (such as voltage phase sequence error + TA reverse polarity + TV disconnection), resulting in insufficient realism of training scenarios. Weak interactive capabilities: It lacks intelligent data interaction functions, making it impossible to achieve a closed loop of fault setting, signal output, and measurement analysis, resulting in low training effectiveness and testing efficiency.

[0004] To address the above problems, existing technologies have corresponding technical solutions, but all of them have some issues, such as: Existing patent document one, publication number CN117437823A, discloses a portable power metering device wiring simulation device, including a housing, a CAN bus communication module, a small-signal simulated three-phase power meter, a small-signal phase volt-ampere meter, a small-signal integrated processing center, a small-signal three-phase voltage generating circuit, a small-signal three-phase current generating circuit, a wiring fault simulation controller, and a junction box. However, this patent has problems such as insufficient integration, resulting in a large size that is difficult to meet portability requirements; moreover, its control strategy is relatively complex, with many hardware components, leading to high hardware costs.

[0005] Existing patent document two, publication number CN119785643A, discloses a portable power metering and analysis simulation device. The device includes a simulation control unit, a three-phase simulation power generation unit, a display screen, and multiple output terminals. The simulation control unit acquires fault simulation information and determines display parameters, voltage parameters, and current parameters corresponding to each output terminal based on the fault simulation information. It then sends the voltage and current parameters corresponding to each output terminal to the three-phase simulation power generation unit and controls the display screen to display the parameters. The three-phase simulation power generation unit outputs metering voltage and metering current to each output terminal based on the voltage and current parameters corresponding to each output terminal. The metering voltage and metering current output to the output terminals are identical to the voltage and current parameters corresponding to the output terminals. However, while this patent achieves miniaturization, it does not fundamentally solve the safety hazards posed by high-voltage systems, fails to meet the traceability requirements of the "Technical Management Regulations for Power Metering Devices" regarding training data traceability, and cannot achieve a closed loop of fault setting, signal output, and measurement analysis. Summary of the Invention

[0006] This invention provides a three-phase energy meter full fault simulation device and method, which overcomes the shortcomings of the prior art and can effectively solve the problem of poor integration and poor portability of existing fault simulation devices.

[0007] One of the technical solutions of this invention is achieved through the following measures: a three-phase energy meter full-fault simulation device, comprising: The fault simulation unit determines the type of fault to be simulated, outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table, and performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. The simulation unit adopts a multi-layer PCB structure. Based on the fault simulation parameters, it outputs the corresponding fault simulation signal to the dummy meter tail terminal unit. The fault simulation signal includes voltage amplitude, current amplitude, voltage phase, and current phase. The dummy meter tail terminal unit is equipped with a standard terminal layout corresponding to three-phase four-wire and three-phase three-wire metering devices, and is connected to the fault simulation signal output by the simulation unit. The measuring unit measures the low-voltage measurement values ​​at the dummy meter tail terminal unit and converts them into the corresponding high-voltage measurement values. The low-voltage measurement values ​​include low-voltage voltage values, low-voltage current values, and the phase between voltage and current.

[0008] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned fault simulation unit includes: The fault setting module determines the type of fault to be simulated and outputs the corresponding fault simulation parameters based on a preset fault parameter mapping table. The fault analysis module performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit, and obtains wiring diagrams, vector diagrams, and power expressions drawn in SVG format. The communication module includes an interaction submodule and a communication submodule. The interaction submodule provides an interactive interface, performs human-computer interaction and data display, and the communication submodule is used to communicate with the simulation unit. The storage module stores all data during the full fault simulation process of the three-phase energy meter and supports historical record queries.

[0009] The above simulation unit includes: The communication module communicates with the fault simulation unit and receives fault simulation parameters; The core control module receives and parses fault simulation parameters through the communication module, and then sends the fault simulation parameters to the small signal generation module. The small signal generation module calls the weak current signal proportional conversion algorithm and outputs the corresponding fault simulation signal to the dummy meter tail terminal unit according to the fault simulation parameters.

[0010] The aforementioned measuring unit is a simulated dual-clamp digital phase volt-ampere meter with communication capabilities. It collects the weak electrical signal at the tail terminal unit of the dummy meter and converts it into a strong electrical display value proportionally.

[0011] The aforementioned measurement unit also includes a switch to switch between training mode and measurement mode, specifically including: Switch to training mode, collect the low-voltage signal at the terminal unit of the fake meter, and convert it into a high-voltage display value proportionally; Displayed voltage value = Measured low voltage value × 44; Displayed current value = Measured low-voltage current value × 500; Switch to measurement mode to acquire the real signal at the tail terminal unit of the dummy meter; Displayed voltage value = Measured voltage value; Displayed current value = Measured current value.

[0012] The above also includes an upper housing and a lower housing. The rear end of the upper housing and the rear end of the lower housing are connected together, and the front end of the upper housing and the front end of the lower housing are fastened together by a latch. The fault simulation unit is set in the upper housing, and the simulation unit, the dummy meter tail terminal unit and the measurement unit are set in the lower housing.

[0013] The second technical solution of the present invention is achieved through the following measures: a method for simulating a full fault in a three-phase energy meter, comprising: The fault simulation unit determines the type of fault to be simulated and outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. The simulation unit receives fault simulation parameters and outputs corresponding fault simulation signals to the dummy meter tail terminal unit based on the fault simulation parameters. The fault simulation signals include voltage amplitude, current amplitude, voltage phase, and current phase. The measurement unit measures the weak current measurement value at the dummy meter tail terminal unit, converts it into the corresponding strong current measurement value, and then uploads it to the fault simulation unit. The weak current measurement value includes the weak current voltage value, the weak current value, and the phase between the voltage and the current. The fault simulation unit performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit, and obtains the corresponding voltage and current vector diagram, wiring diagram, and power expression.

[0014] The following are further optimizations and / or improvements to the above-mentioned technical solution: The aforementioned simulation unit receives fault simulation parameters and outputs corresponding fault simulation signals to the dummy meter tail terminal unit based on these parameters, including: The core control module analyzes the fault simulation parameters received by the communication module and sends the analysis results to the small signal generation module. The small signal generation module calls the weak current signal proportional conversion algorithm to output the corresponding fault simulation signal to the dummy meter tail terminal unit based on the fault simulation parameters. The calling of the weak current signal proportional conversion algorithm includes: Voltage conversion formula: Low voltage value = High voltage value ÷ 44; Current conversion formula: Low current value = High current value ÷ 500; Phase preservation rule: The phase of a weak electrical signal is completely consistent with the phase of a strong electrical signal.

[0015] The above measurement unit switches between training mode and measurement mode via a switch; If the training mode is switched, the mode information is sent to the fault simulation unit simultaneously, and the weak current signal at the tail terminal unit of the fake meter is collected and converted into a strong current display value proportionally. Displayed voltage value = Measured low voltage value × 44; Display current value (standard current value) = Measured low-voltage current value × 500; If switched to measurement mode, the real signal at the dummy meter tail terminal unit will be acquired; Displayed voltage value = Measured voltage value; Displayed current value = Measured current value.

[0016] This invention discloses a three-phase energy meter full fault simulation device that integrates single-board integration, fault simulation, and low-voltage simulation. The device uses a 5V / 10mA low-voltage signal to completely eliminate the risk of electric shock from high voltage, complies with the IEC 61010-1 electrical safety standard, and achieves a lightweight design through single-board integration. After actual measurement, the volume is ≤0.01m² and the weight is ≤5kg, making it highly portable for a single person and suitable for outdoor / grassroots scenarios. Furthermore, the device covers a complete range of faults and can be updated regularly, which helps to improve the effectiveness of personnel training. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of a three-phase energy meter full fault simulation device provided by the present invention.

[0018] Appendix Figure 2 This is a schematic diagram of the dummy tail terminal unit structure provided by the present invention.

[0019] Appendix Figure 3 This is a schematic diagram of the fault simulation unit structure provided by the present invention.

[0020] Appendix Figure 4 This is a schematic diagram of the simulation unit structure provided by the present invention.

[0021] Appendix Figure 5 This is a schematic diagram of another three-phase energy meter full fault simulation device provided by the present invention.

[0022] Appendix Figure 6 This is a schematic diagram of the full fault simulation method for three-phase energy meters provided by the present invention.

[0023] Appendix Figure 7 This is a vector diagram provided in Embodiment 10 of the present invention.

[0024] Appendix Figure 8 The wiring diagram provided for Embodiment 10 of the present invention.

[0025] Appendix Figure 9 The waveform diagram provided in Embodiment 10 of the present invention.

[0026] Appendix Figure 10 This is a vector diagram provided in Embodiment 11 of the present invention.

[0027] Appendix Figure 11 This is a wiring diagram provided for Embodiment 11 of the present invention.

[0028] The codes in the attached diagram are as follows: 1 for upper housing, 2 for lower housing, 3 for latch, 4 for fault simulation unit, 5 for dummy meter tail terminal unit, and 6 for measurement unit. Detailed Implementation

[0029] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0030] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 As shown, this embodiment of the invention discloses a three-phase energy meter full-fault simulation device, comprising: The fault simulation unit 4 determines the type of fault to be simulated, outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table, and performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit 6. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. The simulation unit adopts a multi-layer PCB structure. Based on the fault simulation parameters, it outputs the corresponding fault simulation signal to the dummy meter tail terminal unit 5. The fault simulation signal includes voltage amplitude, current amplitude, voltage phase, and current phase. The dummy meter tail terminal unit 5 is equipped with a standard terminal layout corresponding to three-phase four-wire and three-phase three-phase metering devices, and is connected to the fault simulation signal output by the simulation unit. Measurement unit 6 measures the weak current measurement value at the tail terminal unit 5 of the dummy meter and converts it into the corresponding strong current measurement value. The weak current measurement value includes the weak current voltage value, the weak current value, and the phase between the voltage and the current.

[0031] The aforementioned fault simulation unit 4 can be an application program (APP) or an electronic device with wired or wireless communication capabilities. The electronic device may include a processor and a memory. The memory stores a computer program, which is loaded and executed by the processor to determine the simulated fault type, output corresponding fault simulation parameters based on a preset fault parameter mapping table, and perform fault analysis on the weak current measurement values ​​returned by the measurement unit 6. The specific computer program can be presented as an APP. The processor can be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application; it can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc. The memory can include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, a read-only memory, a portable hard drive, a magnetic disk, or an optical disk.

[0032] It should also be noted that the fault parameter mapping table preset in the fault simulation unit 4 can cover all faults in three-phase four-wire and three-phase three-wire systems, and can be maintained and updated regularly.

[0033] The simulation unit described above is a single-board integrated module. The single board adopts a multi-layer PCB structure. It generates an AC 5V / 10mA safety signal based on DDS direct digital frequency synthesis technology. It dynamically simulates the electrical characteristics of three-phase four-wire and three-phase three-wire metering devices under fault combinations such as TV / Yy wiring and TA simplified / phase-separated wiring. It uses AC 5V safety voltage and 10mA current to simulate the operating status and data output of the energy meter tail under different incorrect wiring and different loads (e.g., 0 to 5A).

[0034] The aforementioned dummy tail terminal unit 5 can be as shown in the attached figure. Figure 2 As shown, the terminals are defined as follows: terminals 1 and 3 are IA, terminals 4 and 6 are IB, terminals 7 and 9 are IC, terminal 2 is UA, terminal 5 is UB, terminal 8 is UC, and terminal 10 is UN (neutral wire), which corresponds to the standard terminal layout of a three-phase four-wire metering device to ensure that the simulated scenario is consistent with the actual equipment.

[0035] The aforementioned measuring unit 6 may be, but is not limited to, a voltmeter and ammeter capable of performing weak electrical signal conversion.

[0036] This invention discloses a three-phase energy meter full fault simulation device that integrates single-board integration, fault simulation, and low-voltage simulation. The device uses a 5V / 10mA low-voltage signal to completely eliminate the risk of electric shock from high voltage, complies with the IEC 61010-1 electrical safety standard, and achieves a lightweight design through single-board integration. After actual measurement, the volume is ≤0.01m² and the weight is ≤5kg, making it highly portable for a single person and suitable for outdoor / grassroots scenarios. Furthermore, the device covers a complete range of faults and can be updated regularly, which helps to improve the effectiveness of personnel training.

[0037] Example 2: As shown in the attached document Figure 2 As shown, the embodiment of the present invention is a further optimization of the above embodiment, wherein the fault simulation unit 4 includes: The fault setting module determines the type of fault to be simulated and outputs the corresponding fault simulation parameters based on a preset fault parameter mapping table. The aforementioned determination of the simulated fault type can be achieved by obtaining the fault type matching the fault parameter mapping table index from an external source through the communication module in an intelligent interactive manner, or by using the built-in fault type retrieval method to select the fault type from the fault parameter mapping table through the communication module in an intelligent interactive manner.

[0038] The process of constructing the fault parameter mapping table (taking a three-phase four-wire system as an example) includes: (1) Define 6 basic fault types and their subtypes, specifically including: Voltage phase sequence error (6 types: abc, acb, bca, bac, cab, cba); Current phase sequence error (6 types: same as above); Voltage transformer (TV) polarity reverse connection (3 phases independent, 2³=8 types in total); Current transformer (TA) polarity reverse connection (3-phase independent, 8 types in total); TV secondary disconnection (3 phases independent, 8 types in total); TA secondary short circuit / open circuit (3 phases independent, 8 types in total).

[0039] (2) Calculate the number of compound faults The total number of compound faults is (6×6×8×8×8×8) = 111132, which are any combination of basic faults.

[0040] (3) Preset fault parameter mapping table A unique code is assigned to each fault (e.g., "voltage phase sequence acb+TA B reverse connection" is coded as 001-012), and the corresponding fault simulation parameters are pre-stored. These fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase, as detailed below: Voltage amplitude (e.g., UA=0V when TV A phase is disconnected); Voltage phase (e.g., when voltage phase sequence acb, UA=0°, UB=240°, UC=120°); Current amplitude (e.g., when the current transformer (TA) is short-circuited, the corresponding phase current is 0mA); Current phase (e.g., when T and B are reversed, the IB phase = the original phase + 180°).

[0041] The fault simulation parameters here are specifically based on DDS direct digital frequency synthesis technology to generate adjustable weak electrical signals (5V / 10mA), and different working conditions are simulated by adjusting the amplitude and phase.

[0042] For example, if the simulated fault type is determined to be "voltage phase sequence bca + current phase sequence cab + TV A phase disconnection", then the fault simulation parameters obtained based on the preset fault parameter mapping table are voltage amplitude, current amplitude (when TV A phase disconnection occurs, the corresponding voltage amplitude is 0) and phase (e.g., voltage phase sequence bca corresponds to phases of 120°, 240°, and 0°).

[0043] The fault analysis module performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit 6, and obtains wiring diagrams, vector diagrams (voltage / current vectors are refreshed in real time) and power expressions drawn in SVG format; It should be noted that the process of generating vector diagrams (voltage / current vectors are refreshed in real time) and power expressions based on the high-voltage measurement values ​​returned by measurement unit 6 are all existing well-known technologies. Corresponding wiring diagrams can also be preset according to various fault types, which are convenient for retrieval and display during fault analysis.

[0044] The wiring diagram includes the following wiring settings: Three-phase three-wire, via TV (V / V connection), via TA simplified wiring Three-phase three-wire, via TV (V / V connection) and via TA phase-by-phase connection. Three-phase three-wire, via TV (Y / Y connection), via TA simplified connection Three-phase three-wire, via TV (Y / Y connection) and via TA phase-by-phase connection. Three-phase four-wire, via TV (Y / Y connection), via TA simplified connection Three-phase four-wire, via TV (Y / Y connection) and via TA phase-by-phase connection. Three-phase four-wire, no TV, simplified wiring via TA. Three-phase four-wire, no TV, phase-by-phase connection via TA. Wiring methods include, but are not limited to, any combination of incorrect voltage phase sequence, incorrect current phase sequence, reverse polarity of voltage and current transformer secondary circuits, open circuit of voltage transformer secondary circuit, short circuit and open circuit of current transformer secondary circuit.

[0045] The communication module includes an interaction submodule and a communication submodule. The interaction submodule provides an interactive interface, performs human-computer interaction and data display, and the communication submodule is used to communicate with the simulation unit. The aforementioned interactive submodule can be a touch screen display, and the communication submodule can be a WiFi module.

[0046] The storage module stores all data during the full fault simulation process of the three-phase energy meter and supports historical record queries; The aforementioned storage module supports historical record queries and can export query results in Excel format.

[0047] Example 3: As shown in the attached document Figure 4 As shown, the embodiments of the present invention are further optimizations of the above embodiments, wherein the simulation unit includes: The communication module communicates with the fault simulation unit 4 and receives fault simulation parameters; The aforementioned communication submodule must be compatible with the communication module in fault simulation unit 4. It can be a WiFi module with a communication distance of ≥50m (open environment) and can also support encrypted data transmission.

[0048] The core control module receives and parses fault simulation parameters through the communication module, and then sends the fault simulation parameters to the small signal generation module. The aforementioned core control module can be a known existing control chip.

[0049] The small signal generation module calls the weak current signal proportional conversion algorithm and outputs the corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters. The aforementioned low-voltage signal scaling algorithm is the core of achieving "low-voltage simulation of high-voltage". Based on DDS direct digital frequency synthesis technology, it ensures that the signal characteristics match the actual operating conditions by scaling down the amplitude and maintaining the phase. The details are as follows: Voltage conversion formula: Low voltage value = high voltage value ÷ 44 (e.g., 220V high voltage corresponds to 5V low voltage, 57.7V high voltage corresponds to 1.31V low voltage). Derivation basis: Based on the safety voltage limit (≤36V) of the "Low Voltage Power Distribution Design Code" and combined with the signal sampling accuracy (12-bit DAC supports 0-5V range), 1:44 is determined to be the optimal ratio (220V÷44=5V, 380V÷44≈8.6V, both ≤36V).

[0050] Current conversion formula: Low current value = High current value ÷ 500 (e.g., 5A high current corresponds to 10mA low current, 2.5A high current corresponds to 5mA low current). Derivation basis: Based on the sampling accuracy of clamp meter (accuracy of ±0.1mA in 0-10mA range), a 500x ratio can cover the 0-5A high voltage range (5A÷500=10mA).

[0051] Phase preservation rule: The phase of the weak signal is completely consistent with the phase of the strong signal (e.g., the phases of the strong signal ABC phase sequence are 0°, 120°, and 240°, and the weak signal is in the same phase), ensuring that the vector relationship remains unchanged.

[0052] Example 4: This embodiment of the invention is a further optimization of the above embodiment, wherein the measuring unit 6 is a simulated dual-clamp digital phase voltammeter with communication function, which collects the weak current signal at the tail terminal unit 5 of the dummy meter and converts it into a strong current display value proportionally.

[0053] The simulated dual-clamp digital phase volt-ampere meter can measure weak voltage and current signals and amplify them proportionally to display standard voltage and current values, i.e., strong voltage and current values, for use in wiring analysis. Specific core parameters that can be selected include, but are not limited to: Voltage measurement: Range 0-5V (corresponding to 0-220V), accuracy ±0.2%; Current measurement: range 0-10mA (corresponding to 0-5A), accuracy ±0.2%; Phase measurement: 0-360°, accuracy ±0.5°; Display: 3.4-inch LCD screen, supporting real-time display of vector graphics.

[0054] The measured weak voltage and weak current signals are proportionally amplified and displayed as standard voltage and current values, as detailed below: Displayed voltage value (standard voltage value) = Measured low-voltage value × 44 (voltage gain) Displayed current value (standard current value) = Measured low-voltage current value × 500 (current gain) It should be noted that the voltage gain here can be modified.

[0055] Example: Measure low voltage value UA=5V → display 220V; Measure low current value IA=10mA → display 5A.

[0056] The simulated dual-clamp digital phase volt-ampere meter can also be switched to standard measurement mode for on-site measurement and analysis of actual voltage and current. Simultaneously, it can wirelessly upload on-site measurement data to a power meter error wiring analysis app to analyze the on-site wiring situation and display vector diagrams, wiring diagrams, power expressions, and supplementary power quantities.

[0057] Example 5: This embodiment of the invention is a further optimization of the above embodiments, wherein the measurement unit 6 further includes a switching switch to perform training mode / measurement mode switching, specifically including: Switch to training mode, collect the weak current signal at terminal unit 5 of the fake meter tail, and convert it into a strong current display value proportionally; Display voltage value (standard voltage value) = Measured low voltage value × 44 (voltage gain); Display current value (standard current value) = Measured low-voltage current value × 500 (current gain); Switch to measurement mode and collect the real signal at terminal unit 5 of the dummy meter tail; Displayed voltage value = Measured voltage value (direct acquisition, no gain); Displayed current value = Measured current value (direct acquisition, no gain); When switching modes via the switch, mode information can be sent to the fault simulation unit 4 simultaneously. If switching to training mode, the measurement unit 6 will update the gain coefficient within 100ms.

[0058] This invention supports "training / measurement" switching, which can be used for both simulated training and real-world fault detection, thereby reducing equipment procurement costs.

[0059] Example 6: As attached Figure 5 As shown, the embodiment of the present invention is a further optimization of the above embodiment, which also includes an upper housing 1 and a lower housing 2. The rear end of the upper housing 1 and the rear end of the lower housing 2 are connected together, and the front end of the upper housing 1 and the front end of the lower housing 2 are fastened together by a latch 3. The fault simulation unit 4 is set in the upper housing 1, and the simulation unit, the dummy meter tail terminal unit 5 and the measurement unit 6 are set in the lower housing 2.

[0060] Example 7: As attached Figure 6 As shown, this invention discloses a method for simulating a full fault in a three-phase energy meter, comprising: Step S110: The fault type is determined by the fault simulation unit 4, and the corresponding fault simulation parameters are output based on the preset fault parameter mapping table. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. In step S120, the simulation unit receives the fault simulation parameters and outputs the corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters. The fault simulation signal includes voltage amplitude, current amplitude, voltage phase, and current phase. Step S130: The measurement unit 6 measures the weak current measurement value at the dummy meter tail terminal unit 5, converts it into the corresponding strong current measurement value, and uploads it to the fault simulation unit 4. The weak current measurement value includes the weak current voltage value, the weak current value, and the phase between the voltage and the current. In step S140, the fault simulation unit 4 performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit 6 to obtain the corresponding voltage and current vector diagram, wiring diagram, and power expression.

[0061] Example 8: This embodiment of the invention is a further optimization of the above embodiments, wherein the simulation unit receives fault simulation parameters and outputs a corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters, including: The core control module analyzes the fault simulation parameters received by the communication module and sends the analysis results to the small signal generation module. The small signal generation module calls the weak current signal proportional conversion algorithm to output the corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters. The calling of the weak current signal proportional conversion algorithm includes: Voltage conversion formula: Low voltage value = High voltage value ÷ 44; Current conversion formula: Low current value = High current value ÷ 500; Phase preservation rule: The phase of a weak electrical signal is completely consistent with the phase of a strong electrical signal.

[0062] Example 9: This embodiment of the invention is a further optimization of the above embodiments, wherein the measurement unit 6 switches between training mode and measurement mode; If the training mode is switched, the mode information is sent to the fault simulation unit 4, and the weak current signal at the tail terminal unit 5 of the fake meter is collected and converted into a strong current display value proportionally. Display voltage value (standard voltage value) = Measured low voltage value × 44 (voltage gain); Display current value (standard current value) = Measured low-voltage current value × 500 (current gain); If switched to measurement mode, the real signal at terminal unit 5 of the dummy meter tail will be collected; Displayed voltage value = Measured voltage value (direct acquisition, no gain); Displayed current value = measured current value (direct acquisition, no gain).

[0063] Example 10: This embodiment of the invention discloses simulating correct three-phase four-wire wiring using the device disclosed in this invention, as detailed below: (1) Fault simulation unit 4 determines the fault-free type and outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table. Specifically, it is a three-phase four-wire system without PT and six-wire system via CT, with voltage abc and current abc (normal wiring); voltage 220V and current 5A.

[0064] (2) The simulation unit outputs the corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters; The process of obtaining the fault simulation signal is as follows: Low voltage signal proportional conversion algorithm: UA=220V÷44=5V, IA=5A÷500=10mA; calculate the amplitude (UA=UB=UC=5V, IA=IB=IC=10mA). Phase calculation: Voltage phase 0°, 120°, 240° (consistent with normal phase sequence), current phase is in phase with voltage.

[0065] The output dummy meter tail terminal unit 5 is as follows: terminals 1 and 3 correspond to IA, terminals 4 and 6 correspond to IB, terminals 7 and 9 correspond to IC, terminal 2 corresponds to UA, terminal 5 corresponds to UB, terminal 8 corresponds to UC, and terminal 10 corresponds to UN.

[0066] (3) The measuring unit 6 measures the weak current measurement value at the dummy meter tail terminal unit 5 and converts it into the corresponding strong current measurement value.

[0067] Specifically, the voltage gain is 44, the current gain is 500, the measured voltage of 5V corresponds to the display of 220V, and the measured current of 10mA corresponds to the display of 5A.

[0068] (4) The fault simulation unit 4 performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit 6. The analysis results are attached. Figure 7 , 8 As shown in Figures 9 and 9.

[0069] Example 11: This embodiment of the invention discloses a simulation of a complex fault (voltage phase sequence bca + TAB opposite polarity + TV C phase open circuit) using the device disclosed in this invention, as detailed below: (1) Fault simulation unit 4 determines the fault-free type and outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table. Specifically, the voltage wiring combination is bca, the current wiring combination is cab, the secondary phase of TV A is disconnected, the secondary polarity of TAB phase is reversed, the voltage is 57.7V, and the current is 2.5A.

[0070] The corresponding fault simulation parameters are as follows: Voltage: Phase sequence bca corresponds to phases 120° (UA), 240° (UB), and 0° (UC); TV C phase disconnection → UC = 0V; Current: Phase sequence abc (default), T A B opposite polarity → IB phase = 120° + 180° = 300°; current amplitude 5mA (corresponding to 2.5A); (2) The simulation unit outputs the corresponding fault simulation signal to the dummy meter tail terminal unit 5 according to the fault simulation parameters; The fault simulation signals are as follows: UA=1.31V (corresponding to 57.7V), UB=1.31V, UC=0V; IA=5mA (phase 0°), IB=5mA (phase 300°), IC=5mA ​​(phase 240°).

[0071] (3) The measuring unit 6 measures the weak current measurement value at the dummy meter tail terminal unit 5 and converts it into the corresponding strong current measurement value.

[0072] (4) The fault simulation unit 4 performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit 6. The analysis results are attached. Figure 10 , 11 As shown.

[0073] The above content is only a specific embodiment of this application, which has strong adaptability and implementation effect. However, the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. Therefore, equivalent changes made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A three-phase electricity meter full fault simulation device, comprising full fault simulation under three-phase four-wire and three-phase three-wire wiring conditions, characterized in that, include: The fault simulation unit determines the type of fault to be simulated, outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table, and performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. The simulation unit adopts a multi-layer PCB structure. Based on the fault simulation parameters, it outputs the corresponding fault simulation signals to the dummy meter tail terminal unit. The fault simulation signals include voltage weak signals, current weak signals, voltage amplitude, and current amplitude. The dummy meter tail terminal unit is equipped with a standard terminal layout corresponding to three-phase four-wire and three-phase three-wire metering devices, and is connected to the fault simulation signal output by the simulation unit. The measuring unit measures the low-voltage measurement values ​​at the dummy meter tail terminal unit and converts them into the corresponding high-voltage measurement values. The low-voltage measurement values ​​include low-voltage voltage values, low-voltage current values, and the phase between voltage and current.

2. The three-phase energy meter full fault simulation device according to claim 1, characterized in that, The fault simulation unit includes: The fault setting module determines the type of fault to be simulated and outputs the corresponding fault simulation parameters based on a preset fault parameter mapping table. The fault analysis module performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit, and obtains wiring diagrams, vector diagrams, and power expressions drawn in SVG format. The communication module includes an interaction submodule and a communication submodule. The interaction submodule provides an interactive interface, performs human-computer interaction and data display, and the communication submodule is used to communicate with the simulation unit. The storage module stores all data during the full fault simulation process of the three-phase energy meter and supports historical record queries.

3. The three-phase energy meter full-fault simulation device according to claim 1 or 2, characterized in that, The simulation unit includes: The communication module communicates with the fault simulation unit and receives fault simulation parameters; The core control module receives and parses fault simulation parameters through the communication module, and then sends the fault simulation parameters to the small signal generation module. The small signal generation module calls the weak current signal proportional conversion algorithm and outputs the corresponding fault simulation signal to the dummy meter tail terminal unit according to the fault simulation parameters.

4. The three-phase energy meter full-fault simulation device according to claim 1 or 2, characterized in that, The measuring unit is a simulated dual-clamp digital phase volt-ampere meter with communication function, which collects the weak current signal at the tail terminal unit of the dummy meter and converts it into a strong current display value proportionally.

5. The three-phase energy meter full fault simulation device according to claim 4, characterized in that, The measurement unit also includes a switch for switching between training mode and measurement mode, specifically including: Switch to training mode, collect the low-voltage signal at the terminal unit of the fake meter, and convert it into a high-voltage display value proportionally; Displayed voltage value = Measured low voltage value × 44; Displayed current value = Measured low-voltage current value × 500; Switch to measurement mode to acquire the real signal at the tail terminal unit of the dummy meter; Displayed voltage value = Measured voltage value; Displayed current value = Measured current value.

6. The three-phase energy meter full-fault simulation device according to any one of claims 1 to 5, characterized in that, The device also includes an upper housing and a lower housing. The rear ends of the upper housing and the lower housing are connected together, and the front ends of the upper housing and the lower housing are fastened together by a latch. The fault simulation unit is located in the upper housing, and the simulation unit, the dummy meter tail terminal unit, and the measurement unit are located in the lower housing.

7. A method for simulating a full fault of a three-phase energy meter using the device described in any one of claims 1 to 6, characterized in that, include: The fault simulation unit determines the type of fault to be simulated and outputs the corresponding fault simulation parameters based on the preset fault parameter mapping table. The fault simulation parameters include voltage amplitude, current amplitude, voltage phase, and current phase. The simulation unit receives fault simulation parameters and outputs corresponding fault simulation signals to the dummy meter tail terminal unit based on the fault simulation parameters. The fault simulation signals include voltage amplitude, current amplitude, voltage phase, and current phase. The measurement unit measures the weak current signal at the tail terminal unit of the dummy meter, converts it into the corresponding strong current measurement value, and then uploads it to the fault simulation unit. The weak current signal includes the weak current voltage value, the weak current value, and the phase between the voltage and the current. The fault simulation unit performs fault analysis on the high-voltage measurement values ​​returned by the measurement unit, and obtains the corresponding voltage and current vector diagram, wiring diagram, and power expression.

8. The three-phase energy meter full fault simulation method according to claim 7, characterized in that, The simulation unit receives fault simulation parameters and outputs corresponding fault simulation signals to the dummy meter tail terminal unit based on the fault simulation parameters, including: The core control module analyzes the fault simulation parameters received by the communication module and sends the analysis results to the small signal generation module. The small signal generation module calls the weak current signal proportional conversion algorithm to output the corresponding fault simulation signal to the dummy meter tail terminal unit based on the fault simulation parameters. The calling of the weak current signal proportional conversion algorithm includes: Voltage conversion formula: Low voltage value = High voltage value ÷ 44; Current conversion formula: Low current value = High current value ÷ 500; Phase preservation rule: The phase of a weak electrical signal is completely consistent with the phase of a strong electrical signal.

9. The three-phase energy meter full fault simulation method according to claim 7 or 8, characterized in that, The measurement unit switches between training mode and measurement mode via a switch. If the training mode is switched, the mode information is sent to the fault simulation unit simultaneously, and the weak current signal at the tail terminal unit of the fake meter is collected and converted into a strong current display value proportionally. Displayed voltage value = Measured low voltage value × 44; Display current value (standard current value) = Measured low-voltage current value × 500; If switched to measurement mode, the real signal at the dummy meter tail terminal unit will be acquired; Displayed voltage value = Measured voltage value; Displayed current value = Measured current value.

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