Direct type three-phase electric energy meter wiring detection device and method

Abstract

The application relates to a kind of direct type three-phase electric energy meter wiring detection device and method, the device includes shell and setting in shell needle assembly, AD sampling module, low-power intelligent detection circuit, indication module and power module;Needle assembly is set in the side of shell, needle assembly includes multiple needles, multiple needles are arranged along the terminal arrangement direction of the wiring end of the detected direct type three-phase electric energy meter, and are respectively used for corresponding abutment with voltage terminal, zero line terminal and current terminal in the wiring end of the detected direct type three-phase electric energy meter;Shell and needle assembly form the docking limiting relationship matched with the wiring end of the detected direct type three-phase electric energy meter, so that multiple needles remain the abutment state with corresponding terminal;Needle assembly is electrically connected with AD sampling module, AD sampling module is electrically connected with low-power intelligent detection circuit, and low-power intelligent detection circuit is electrically connected with indication module.The application has the effect of improving detection reliability.

Description

Technical Field

[0001] This invention belongs to the technical field of on-site testing of electricity metering, and in particular relates to a direct three-phase electricity meter wiring testing device and method. Background Technology

[0002] Currently, direct-type three-phase electricity meters are widely used in industrial, commercial, and residential power distribution scenarios. The correctness of their wiring directly affects the accuracy of electricity metering results and electricity billing. Abnormal wiring can easily cause metering deviations and lead to disputes over electricity supply and use.

[0003] Existing direct three-phase power meter field wiring testing usually involves operators using testing tools to test information such as voltage, current, and phase sequence item by item, and combining the field readings to judge the wiring status. This process is affected by operating experience, field interference, and space limitations at the wiring terminals, resulting in long testing time, poor judgment stability, and relatively rough results in locating wiring abnormalities. Summary of the Invention

[0004] The purpose of this invention is to provide a direct three-phase energy meter wiring detection device and method to solve the technical problems of long detection time, poor stability of judgment results, and coarse location of wiring abnormalities in the existing direct three-phase energy meter field wiring detection process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a direct three-phase energy meter wiring detection device, the device comprising a housing and a pin assembly disposed in the housing, an AD sampling module, a low-power intelligent detection circuit, an indicator module and a power supply module; The pin assembly is disposed on one side of the housing. The pin assembly includes multiple pins, which are arranged along the terminal arrangement direction of the terminals of the direct three-phase energy meter being tested, and are respectively used to abut against the voltage terminal, neutral terminal and current terminal in the terminals of the direct three-phase energy meter being tested. The outer casing and the pin assembly form a mating and limiting relationship with the terminals of the tested direct three-phase energy meter, so that the multiple pins remain in contact with the corresponding terminals. The pin assembly is electrically connected to the AD sampling module, the AD sampling module is electrically connected to the low-power intelligent detection circuit, and the low-power intelligent detection circuit is electrically connected to the indicator module. The power module is disposed inside the housing and is electrically connected to the AD sampling module, the low-power intelligent detection circuit and the indicator module respectively.

[0006] By adopting the above technical solution, and by placing the pin assembly, AD sampling module, low-power intelligent detection circuit, indicator module, and power supply module inside the housing, the contact, sampling, judgment, display, and power supply components required for wiring detection can be integrated into a single structure, thereby improving the convenience of on-site portability and single-person operation. By arranging multiple pins along the terminal arrangement direction of the direct-type three-phase energy meter being tested, and correspondingly contacting the voltage terminal, neutral terminal, and current terminal, detection signals from multiple types of terminals can be acquired at once, thereby reducing the operation time and contact errors caused by individual plug-in testing. By forming a mating and limiting relationship between the housing and the pin assembly and the terminal, the mating posture between the pin assembly and the terminal can be restricted, thereby improving the contact stability between the pin and the corresponding terminal. By sequentially connecting the pin assembly, AD sampling module, low-power intelligent detection circuit, and indicator module, and powering them with the power supply module, a complete working chain from terminal contact, signal sampling, detection judgment to result indication can be formed, thereby improving the automation level of the wiring detection process and the efficiency of detection result output.

[0007] In one example, the present invention can be further configured such that: the plurality of pins include a voltage detection pin for contacting the voltage terminals of each phase, a neutral detection pin for contacting the neutral terminal, and a current detection pin for contacting the current terminals of each phase, wherein the voltage detection pin, the neutral detection pin, and the current detection pin are all electrically connected to the AD sampling module.

[0008] By adopting the above technical solution, and dividing multiple pins into voltage detection pins, neutral wire detection pins, and current detection pins, and using them to abut against each phase voltage terminal, neutral wire terminal, and phase current terminal respectively, the detection signals of different types of terminals can be correspondingly introduced into the AD sampling module, thereby improving the integrity of terminal detection signal acquisition and the accuracy of wiring status identification.

[0009] In one example, the invention can be further configured such that the ejector pin assembly also includes a protective cap connected to the housing and used to cover or expose the plurality of ejector pins.

[0010] By adopting the above technical solution, by setting a protective cover in the ejector assembly that is connected to the housing and used to cover or expose multiple ejector pins, the ejector pins can be shielded and protected in the non-detection state, and the ejector pins can be exposed to participate in contact in the detection state, thereby reducing the risk of ejector pin damage, contamination or accidental contact, and improving the reliability of the device for repeated use.

[0011] In a second aspect, the present invention provides a method for detecting the wiring of a direct three-phase energy meter, the apparatus comprising: When the pin assembly is in contact with the corresponding terminals of the tested direct three-phase energy meter, the contact status of each terminal and the terminal detection signal are obtained. The terminal detection signal is sampled and processed to obtain valid sampled data; Based on the valid sampled data and the contact state, the wiring status is identified to obtain the initial wiring detection result; The initial wiring test results are validated for consistency, a diagnostic confidence level is generated, and the final wiring test results are output based on the initial wiring test results and the diagnostic confidence level.

[0012] By adopting the above technical solution, the contact status and terminal detection signals are obtained when the pin assembly is in contact with the corresponding terminals of the tested direct-type three-phase energy meter. This allows for the simultaneous assessment of terminal contact reliability and terminal electrical status, providing a more reliable data foundation for subsequent wiring status judgment. By sampling and processing the terminal detection signals to obtain effective sampled data, the on-site terminal signals can be converted into data usable for identification and analysis, thereby reducing the impact of original signal interference on the detection results. By identifying the wiring status based on the effective sampled data and contact status, electrical sampling information can be combined with contact reliability judgment, thus improving the reliability of the initial wiring detection results. By performing consistency verification on the initial wiring detection results and generating diagnostic confidence, reliability review can be performed before outputting the final wiring detection results, thereby reducing the risk of misjudgment and missed judgment.

[0013] In one example, the present invention can be further configured as follows: when the pin assembly abuts against the corresponding terminals of the tested direct-type three-phase energy meter, acquiring the contact state and terminal detection signal of each terminal includes: Based on the corresponding contact relationship between the pin assembly and the terminal of the tested direct three-phase energy meter, the terminal connection relationship between each pin and each terminal is determined. Based on the terminal connection relationship, the contact voltage drop or microcurrent loop state formed by each pin at the corresponding terminal is collected to obtain the contact state of each terminal. When the contact state meets the contact reliability requirements, the voltage and current signals of each terminal are collected by the pin assembly to obtain the terminal detection signal.

[0014] By adopting the above technical solution, the terminal connection relationship can be determined according to the corresponding contact relationship between the ejector pin assembly and the terminal block, thus clarifying the correspondence between each ejector pin and each terminal block and avoiding confusion of terminal signal sources. By collecting contact voltage drop or micro-current loop status based on the terminal connection relationship, the contact status of each terminal block can be obtained, thus providing a basis for judging whether the ejector pin is reliably contacting. By collecting voltage and current signals when the contact status meets the contact reliability conditions, the terminal detection signal can be established on the basis of reliable contact, thereby improving the accuracy of subsequent sampling and wiring identification.

[0015] In one example, the present invention can be further configured as follows: based on the terminal connection relationship, acquiring the contact voltage drop or micro-current loop state formed by each pin at the corresponding terminal to obtain the contact state of each terminal includes: Acquire the contact voltage drop data and / or micro-current loop data formed by each ejector pin at the corresponding terminal; By associating the contact voltage drop data and the microcurrent loop data with the terminal docking relationship, terminal contact data is obtained; The contact reliability of each terminal is determined based on the terminal contact data, and the contact state of each terminal is obtained.

[0016] By adopting the above technical solution, and by acquiring the contact voltage drop data and / or micro-current loop data formed by each pin at the corresponding terminal, the contact status between the pin and the terminal can be reflected from the voltage drop change or conduction state, thereby improving the objectivity of the contact status judgment; by associating the contact voltage drop data and micro-current loop data with the terminal docking relationship, terminal contact data corresponding to a specific terminal can be formed, thereby avoiding the disconnect between the contact detection results and the terminal position; by judging the contact reliability based on the terminal contact data, the contact status of each terminal can be obtained, thereby providing contact reliability constraints for subsequent wiring status identification.

[0017] In one example, the present invention can be further configured such that: the sampling processing of the terminal detection signal to obtain valid sampled data includes: The terminal detection signal is converted from analog to digital to obtain initial sampling data; Perform channel self-testing and phase compensation on the initial sampled data to obtain compensated sampled data; The compensated sampling data is synchronized and aligned, and abnormal windows are removed from the synchronized and aligned compensated sampling data to obtain the valid sampling data.

[0018] By adopting the above technical solution, the voltage and current signals can be converted into initial sampling data through analog-to-digital conversion of the terminal detection signals, which facilitates subsequent processing by the low-power intelligent detection circuit. By performing channel self-testing and phase compensation on the initial sampling data, the impact of abnormal sampling channel status and phase deviation on detection judgment can be reduced, thereby improving the stability of the compensated sampling data. By performing synchronous alignment and abnormal window removal on the compensated sampling data, data content suitable for wiring status identification can be retained, thereby improving the reliability of effective sampling data.

[0019] In one example, the present invention can be further configured as follows: The step of synchronizing and aligning the compensated sampling data, and then removing abnormal windows from the synchronized and aligned compensated sampling data to obtain the valid sampling data, includes: Based on the sampling timing corresponding to each terminal block, the compensation sampling data is synchronized and aligned to obtain synchronized sampling data; Perform residual consistency judgment on the synchronously sampled data to determine the abnormal sampling window; The valid sampling data is obtained by removing the sampling data corresponding to the abnormal sampling window.

[0020] By adopting the above technical solution, and by synchronizing the compensated sampling data according to the sampling timing of each terminal, the sampling data of different terminals can be made to be on a comparable time basis, thereby obtaining synchronized sampling data. By performing residual consistency judgment on the synchronized sampling data, abnormal sampling windows affected by contact disturbances or external interference can be identified, thereby avoiding abnormal data from participating in subsequent identification. By removing the sampling data corresponding to abnormal sampling windows, more stable and effective sampling data can be obtained, thereby improving the accuracy of wiring status identification.

[0021] In one example, the present invention can be further configured as follows: the step of identifying the wiring status based on the valid sampled data and the contact status to obtain an initial wiring detection result includes: The voltage, current, and phase characteristics of each terminal are extracted from the valid sampled data to obtain the terminal state characteristics; By associating the terminal state characteristics with the contact state, wiring characteristics are obtained; Based on the matching relationship between the wiring characteristics and the preset wiring model, the normal wiring state or the incorrect wiring state is determined, and the initial wiring detection result is obtained.

[0022] By adopting the above technical solution, voltage, current and phase features can be extracted from effective sampling data to form terminal status features that reflect the electrical state of each terminal, thus providing a feature basis for judging the wiring status. By associating the terminal status features with the contact status, the wiring features can simultaneously reflect the electrical state of the terminal and the reliability of the contact, thereby reducing the identification error caused by abnormal contact. By determining the normal wiring status or incorrect wiring status based on the matching relationship between the wiring features and the preset wiring model, the initial wiring detection results can be obtained, thereby realizing the automatic identification of the wiring status of direct three-phase energy meters.

[0023] In one example, the present invention can be further configured as follows: performing a consistency check on the initial wiring detection result, generating a diagnostic confidence level, and outputting a final wiring detection result based on the initial wiring detection result and the diagnostic confidence level, including: Based on the terminal state characteristics, the contact state, and the initial wiring detection results, amplitude constraints and phasor operations are performed. Figure 1 The consistency, order component characteristics, and higher harmonic characteristics are verified to obtain the verification results; The reliability of the initial wiring test results is evaluated based on the verification results, and the diagnostic confidence level is generated. When the diagnostic confidence level meets the output condition, the initial wiring detection result is determined as the final wiring detection result; When the diagnostic confidence level does not meet the output conditions, the valid sampled data is reacquired, and the wiring status identification and consistency verification are re-performed based on the reacquired valid sampled data to regenerate the final wiring detection result.

[0024] By adopting the above technical solution, amplitude constraints and phasors are performed based on terminal state characteristics, contact state, and initial wiring detection results. Figure 1 Verification of consistency, sequence component characteristics, and higher harmonic characteristics can validate the rationality of the initial wiring test results from multiple dimensions, thus obtaining more reliable verification results. By evaluating the reliability of the initial wiring test results based on the verification results and generating diagnostic confidence levels, the credibility of the test conclusions can be quantified, thus providing a basis for determining whether to output the final result. By determining the initial wiring test results as the final wiring test results when the diagnostic confidence level meets the output conditions, reliable conclusions can be output in a timely manner, thereby improving on-site testing efficiency. By reacquiring valid sampling data and re-identifying and verifying it when the diagnostic confidence level does not meet the output conditions, low-confidence results can be avoided from being directly output, thereby improving the accuracy of the final wiring test results. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the direct three-phase energy meter wiring detection device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the cooperation structure between the direct three-phase energy meter wiring detection device and the wiring terminal of the direct three-phase energy meter being tested in an embodiment of the present invention. Figure 3 This is a flowchart of a direct three-phase energy meter wiring detection method in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0027] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0028] Example 1 In one embodiment, such as Figure 1 and Figure 2 As shown, this application discloses a direct three-phase energy meter wiring test device, including a housing 6 and a pin assembly 1, an AD sampling module 2, a low-power intelligent detection circuit 3, an indicator module 4, and a power module 5 disposed on the housing 6. The housing 6 serves as the overall supporting structure of the device, used to accommodate and fix the pin assembly 1, AD sampling module 2, low-power intelligent detection circuit 3, indicator module 4, and power module 5, so that the components form a portable integrated structure. The pin assembly 1 is disposed on one side of the housing 6, and the pin assembly 1 includes multiple pins arranged along the terminal arrangement direction of the terminal 7 of the direct three-phase energy meter under test, and is respectively used to abut against the voltage terminal, neutral terminal, and current terminal in the terminal 7 of the direct three-phase energy meter under test. The housing 6 and the pin assembly 1 form a mating limiting relationship with the terminal 7 of the direct three-phase energy meter under test. When the device approaches and presses against the terminal 7 of the direct three-phase energy meter under test, the housing 6 restricts the mating posture of the device, and the pin assembly 1... As the outer casing 6 approaches the wiring terminal, multiple pins maintain contact with the corresponding wiring terminals. The pin assembly 1 is electrically connected to the AD sampling module 2, which in turn is electrically connected to the low-power intelligent detection circuit 3, which is electrically connected to the indicator module 4. The power module 5 is located inside the outer casing 6 and is electrically connected to the AD sampling module 2, the low-power intelligent detection circuit 3, and the indicator module 4, respectively. In use, the pin assembly 1 introduces the detection signal from the wiring terminal 7 of the direct-type three-phase energy meter to the AD sampling module 2. The AD sampling module 2 samples the detection signal and transmits it to the low-power intelligent detection circuit 3. The low-power intelligent detection circuit 3 controls the indicator module 4 to output the wiring detection result based on the sampled detection signal. The power module 5 provides operating power to the AD sampling module 2, the low-power intelligent detection circuit 3, and the indicator module 4, enabling the device to complete terminal contact, signal sampling, detection judgment, and result indication in a single connection, reducing operational errors caused by individual connection detection.

[0029] Furthermore, such as Figure 1 and Figure 2 As shown, the multiple pins include voltage detection pins for contacting the voltage terminals of each phase, neutral detection pins for contacting the neutral terminal, and current detection pins for contacting the current terminals of each phase. The voltage detection pins, neutral detection pins, and current detection pins are distinguished by their positions within the pin assembly 1 and the types of terminals they contact. Specifically, the voltage detection pins are used to contact the voltage terminals of each phase in the terminal 7 of the tested direct-type three-phase energy meter; the neutral detection pins are used to contact the neutral terminal in the terminal 7 of the tested direct-type three-phase energy meter; and the current detection pins are used to contact the current terminals of the tested direct-type three-phase energy meter. The phase current terminals in the three-phase energy meter terminal 7 are connected to each other. The voltage detection pin, neutral wire detection pin, and current detection pin are all electrically connected to the AD sampling module 2, so that the detection signals of each phase voltage terminal, neutral wire terminal, and phase current terminal can enter the AD sampling module 2 through the corresponding pins. After the device is connected to the terminal 7 of the tested direct three-phase energy meter, each type of pin remains in the contact position of its corresponding terminal, so that the AD sampling module 2 can obtain the detection signals corresponding to the voltage terminal, neutral wire terminal, and current terminal, thereby improving the integrity of the terminal detection signal acquisition and the stability of the correspondence.

[0030] Furthermore, such as Figure 1 and Figure 2 As shown, the pin assembly 1 also includes a protective cover, which is connected to the housing 6 and is used to cover or expose multiple pins. When the device is not performing wiring tests, the protective cover is in the position covering multiple pins, so that multiple pins are protected within the protective range formed by the housing 6 and the protective cover, thereby reducing the risk of pin deformation, contamination or accidental contact during carrying, storage or field movement. When the device is performing wiring tests, the protective cover is in the position exposing multiple pins, so that multiple pins can approach and abut against the corresponding terminals along the terminal arrangement direction of the terminal block 7 of the tested direct three-phase energy meter. After the test is completed, the protective cover covers multiple pins again, so that the pin assembly 1 returns to the protected state, thereby improving the field use reliability and repeated test stability of the pin assembly 1.

[0031] Example 2 like Figure 3 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a direct three-phase energy meter wiring detection device, comprising: S10: When the pin assembly is in contact with the corresponding terminals of the tested direct three-phase energy meter, acquire the contact status of each terminal and the terminal detection signal.

[0032] Specifically, at the start of the test, the pin assembly is pressed along the terminal arrangement direction of the direct three-phase energy meter being tested, so that multiple pins in the pin assembly contact the voltage terminal, neutral terminal, and current terminal respectively. The low-power intelligent detection circuit reads the contact feedback formed by the pin assembly at the corresponding terminal and simultaneously receives the voltage and current signals introduced through the pin assembly. The contact feedback is used as the contact state of each terminal, and the voltage and current signals are used as terminal detection signals, providing the input basis for subsequent sampling and processing.

[0033] S20: Sample and process the terminal detection signal to obtain valid sampled data.

[0034] Specifically, after receiving the terminal detection signal, the AD sampling module performs analog-to-digital conversion on the terminal detection signal. During the conversion process, it combines filtering, common-mode rejection, channel status checking, and sampling timing processing to form sampling data from the terminal detection signals from different terminals that can be recognized and processed by the low-power intelligent detection circuit. The low-power intelligent detection circuit then eliminates unstable or inconsistent data windows in the sampling data to obtain valid sampling data for wiring status identification.

[0035] S30: Based on the valid sampled data and contact status, identify the wiring status and obtain the initial wiring detection result.

[0036] Specifically, the low-power intelligent detection circuit determines the voltage, current and phase relationship of each terminal based on the effective sampling data, and confirms the contact reliability of the corresponding terminal in combination with the contact status. On the basis that the contact status can support the wiring judgment, the wiring status reflected by the effective sampling data is matched with the preset wiring model to obtain the initial wiring detection result used to characterize whether the wiring is normal or abnormal.

[0037] S40: Perform consistency verification on the initial wiring test results, generate diagnostic confidence, and output the final wiring test results based on the initial wiring test results and diagnostic confidence.

[0038] Specifically, the low-power intelligent detection circuit verifies the initial wiring detection results by comparing the initial wiring detection results with the amplitude relationship, phase relationship, sequence component characteristics, harmonic characteristics, and contact status in the sampled data. Based on the comparison results, a diagnostic confidence level is generated. When the diagnostic confidence level indicates that the detection results are reliable, the final wiring detection result is output through the indicator module. When the diagnostic confidence level does not indicate that the detection results are reliable, the final conclusion is not output and the data used for judgment is reacquired.

[0039] In one embodiment, in step S10, when the pin assembly is in contact with the corresponding terminals of the tested direct-type three-phase energy meter, the contact status and terminal detection signal of each terminal are acquired, including: S11: Determine the terminal connection relationship between each pin and each terminal according to the corresponding contact relationship between the pin assembly and the wiring terminals of the tested direct three-phase energy meter.

[0040] Specifically, the multiple pins in the pin assembly are aligned with the terminal block according to the terminal arrangement direction of the direct three-phase energy meter being tested, so that the voltage detection pin, neutral wire detection pin, and current detection pin correspond to the voltage terminal, neutral wire terminal, and current terminal, respectively. The docking limit relationship formed by the housing and the pin assembly is used to limit the pressing posture and prevent the pin assembly from shifting laterally or misaligning with the terminal block. After pressing, the correspondence between each pin and the corresponding terminal is recorded, thereby determining the terminal docking relationship between each pin and each terminal.

[0041] S12: Based on the terminal connection relationship, collect the contact voltage drop or micro-current loop state formed by each pin at the corresponding terminal to obtain the contact state of each terminal.

[0042] Specifically, after the terminal connection relationship is determined, the low-power intelligent detection circuit reads the contact feedback between each pin and the corresponding terminal. For pins that can form contact voltage drop detection, the contact voltage drop formed at the corresponding terminal after the pin is pressed is collected. For pins that can form micro-current loop detection, the micro-current conduction state between the pin and the corresponding terminal is collected, and the contact voltage drop or micro-current loop state is mapped to the terminal in the terminal connection relationship to obtain the contact state used to indicate whether each terminal is reliably in contact.

[0043] S13: When the contact condition meets the contact reliability requirements, the voltage and current signals of each terminal are collected through the pin assembly to obtain the terminal detection signal.

[0044] Specifically, after the contact status of each terminal is confirmed, the low-power intelligent detection circuit determines whether the pin assembly and the corresponding terminal are in a stable pressing state. When the contact status meets the contact reliability condition, the pin assembly introduces the voltage signal of the voltage terminal, the reference signal of the neutral terminal, and the current signal of the current terminal into the AD sampling module. When the contact status does not meet the contact reliability condition, the output of the wiring judgment conclusion is paused and a prompt for re-pressing is given, thereby obtaining the terminal detection signal under the premise of reliable contact.

[0045] In one embodiment, in step S12, based on the terminal mating relationship, the contact voltage drop or micro-current loop state formed by each pin at the corresponding terminal is collected to obtain the contact state of each terminal, including: S121: Obtain the contact voltage drop data and / or micro-current loop data formed by each pin at the corresponding terminal.

[0046] Specifically, the low-power intelligent detection circuit reads the contact detection results of each pin according to the terminal connection relationship. For pins whose contact quality is characterized by contact voltage drop, the contact voltage drop data between the pin and the terminal is obtained. For pins whose contact quality is characterized by micro-current conduction, the micro-current loop data between the pin and the terminal is obtained. The contact voltage drop data is used to reflect the potential change after the press-fit contact, and the micro-current loop data is used to reflect whether a conductive path is formed between the pin and the terminal.

[0047] S122: Correlate the contact voltage drop data and microcurrent loop data with the terminal connection relationship to obtain the terminal contact data.

[0048] Specifically, the contact voltage drop data and / or micro-current loop data corresponding to each pin are bound to the corresponding terminals in the terminal docking relationship, so that the contact detection results of voltage terminals, neutral terminals and current terminals can be mapped to specific terminals. When both contact voltage drop data and micro-current loop data are obtained at the same time, both types of data are used as the contact detection basis for the corresponding terminals. When only one type of data is obtained, the available data is used as the contact detection basis for the corresponding terminals, thereby forming terminal contact data.

[0049] S123: Determine the contact reliability of each terminal based on the terminal contact data to obtain the contact status of each terminal.

[0050] Specifically, the low-power intelligent detection circuit determines the reliability of the contact between the ejector pin and the terminal block based on the terminal contact data. When the terminal contact data indicates that the contact voltage drop between the ejector pin and the terminal block is stable or the micro-current loop is stable, the corresponding terminal block is judged to be in reliable contact. When the terminal contact data indicates that there is an abnormal voltage drop, unstable conduction, or insufficient contact between the ejector pin and the terminal block, the corresponding terminal block is judged to be in abnormal contact, and the judgment results of each terminal block are summarized as the contact status.

[0051] In one embodiment, step S20, which involves sampling the terminal detection signal to obtain valid sampled data, includes: S21: Perform analog-to-digital conversion on the terminal detection signal to obtain initial sampling data.

[0052] Specifically, the AD sampling module receives the terminal detection signal introduced through the pin assembly, converts the analog signals corresponding to the voltage and current terminals into digital signals, and collects the voltage and current signals through the input terminal during the conversion process, so that the terminal detection signals of each terminal can form data content that can be read by the low-power intelligent detection circuit. The converted data is used as the initial sampling data.

[0053] S22: Perform channel self-test and phase compensation on the initial sampled data to obtain compensated sampled data.

[0054] Specifically, the low-power intelligent detection circuit performs a status check on the sampling channel corresponding to the initial sampling data. The check includes the channel gain status, zero drift status, and channel response status. Based on the pre-established channel phase delay calibration relationship, it compensates for the phase deviation introduced by different sampling channels, so that the sampling data of each terminal is on a unified compensation basis before phase judgment. The data after channel self-test and phase compensation is used as the compensated sampling data.

[0055] S23: Synchronize and align the compensated sampling data, and remove abnormal windows from the synchronized and aligned compensated sampling data to obtain valid sampling data.

[0056] Specifically, the low-power intelligent detection circuit performs frequency locking and sampling timing alignment on the compensation sampling data, enabling the compensation sampling data from different terminals to be compared on the same detection time basis. Then, the consistency check is performed on the synchronized compensation sampling data to eliminate abnormal data windows caused by contact transients, power grid interference or sampling disturbances, and retain the data that can reflect the stable wiring status to obtain effective sampling data.

[0057] In one embodiment, step S23 involves synchronizing and aligning the compensated sampling data, and then removing abnormal windows from the synchronized and aligned compensated sampling data to obtain valid sampling data, including: S231: Synchronize and align the compensation sampling data according to the sampling timing corresponding to each terminal block to obtain synchronized sampling data.

[0058] Specifically, the low-power intelligent detection circuit unifies the compensated sampling data corresponding to the voltage terminal, neutral terminal, and current terminal to the same sampling time based on the sampling timing of each terminal, so that the sampling data of different terminals can be compared according to the same detection window. For time offset caused by sampling channel differences, the sampling timing is adjusted to align the data, and the aligned compensated sampling data is used as synchronous sampling data.

[0059] S232: Perform residual consistency judgment on synchronously sampled data to determine abnormal sampling windows.

[0060] Specifically, the low-power intelligent detection circuit performs residual consistency judgment on the synchronously sampled data, compares whether the sampling changes of each terminal in the same detection window are consistent with those of adjacent detection windows, and determines the corresponding detection window as an abnormal sampling window when the data in a certain detection window deviates from the overall sampling change trend or does not match the contact state, voltage change, or current change. The abnormal sampling window is used to represent data segments that are not suitable for participating in wiring state recognition.

[0061] S233: Remove the sampling data corresponding to the abnormal sampling window to obtain the valid sampling data.

[0062] Specifically, after the abnormal sampling window is determined, the low-power intelligent detection circuit deletes the data segment corresponding to the abnormal sampling window from the synchronous sampling data, retains the sampling data that has not been judged as abnormal, and reorganizes the retained data according to the correspondence of each terminal, so that the stable sampling data of the voltage terminal and the current terminal continue to maintain the synchronous correspondence. The data after elimination and reorganization is used as valid sampling data.

[0063] In one embodiment, step S30, namely, identifying the wiring status based on valid sampled data and contact status to obtain an initial wiring detection result, includes: S31: Extract the voltage characteristics, current characteristics, and phase characteristics of each terminal from the valid sampled data to obtain the terminal status characteristics.

[0064] Specifically, the low-power intelligent detection circuit reads the voltage changes corresponding to the voltage terminals, the current changes corresponding to the current terminals, and the phase relationships between each phase from the effective sampled data to form data that can characterize the current electrical state of each terminal. The voltage features are used to characterize the voltage state of each phase, the current features are used to characterize the current state of each phase, and the phase features are used to characterize the phase sequence and phase difference relationships between each phase. The voltage features, current features, and phase features are summarized into terminal state features.

[0065] S32: Associate the terminal status characteristics with the contact status to obtain the wiring characteristics.

[0066] Specifically, the low-power intelligent detection circuit associates the terminal status characteristics with the contact status of the corresponding terminals, so that the voltage, current and phase characteristics of each terminal carry the corresponding contact reliability. When the contact status of a terminal is abnormal, the corresponding terminal status characteristics are not directly used as the basis for judging stable wiring. When the contact status is reliable, the corresponding terminal status characteristics participate in the wiring status identification, thereby obtaining wiring characteristics that simultaneously include the electrical status and contact status of the terminals.

[0067] S33: Based on the matching relationship between the wiring characteristics and the preset wiring model, determine the normal wiring state or the incorrect wiring state, and obtain the initial wiring detection result.

[0068] Specifically, the low-power intelligent detection circuit matches the wiring characteristics with a preset wiring model, which includes a standard wiring model and an incorrect wiring model. The standard wiring model is used to characterize the normal correspondence between voltage terminals, neutral terminals, and current terminals, while the incorrect wiring model is used to characterize abnormal correspondences such as reverse phase, phase error, phase loss, loose connection, or reversed terminal connection. When the wiring characteristics match the standard wiring model, it is determined to be a normal wiring state; when the wiring characteristics match the incorrect wiring model, it is determined to be an incorrect wiring state, and the matched state is used as the initial wiring detection result.

[0069] In one embodiment, step S40, which involves performing a consistency check on the initial wiring test results, generating a diagnostic confidence level, and outputting the final wiring test results based on the initial wiring test results and the diagnostic confidence level, includes: S41: Based on terminal status characteristics, contact status, and initial wiring detection results, perform amplitude constraints and phasor... Figure 1 The consistency, sequence component characteristics, and higher harmonic characteristics are verified to obtain the verification results.

[0070] Specifically, the low-power intelligent detection circuit uses the initial wiring detection result as the verification object, and performs a joint check on the voltage, current and phase characteristics in the terminal status characteristics with the contact status. It checks whether the amplitude of each phase meets the amplitude constraints corresponding to the wiring status, whether the phase relationship of each phase is consistent with the initial wiring detection result in the phasor diagram, whether the positive sequence, negative sequence and zero sequence component characteristics match the normal wiring status or the incorrect wiring status, and whether there is an abnormal distribution of higher harmonic characteristics that affects the judgment. The results formed by the above verification are summarized as the verification result.

[0071] S42: Evaluate the reliability of the initial wiring test results based on the verification results and generate diagnostic confidence.

[0072] Specifically, the low-power intelligent detection circuit evaluates the reliability of the initial wiring detection results based on the verification results, when amplitude constraints and phasor constraints are present. Figure 1 When the consistency, sequence component characteristics, higher harmonic characteristics, and contact status are all consistent with the initial wiring test results, the reliability of the corresponding initial wiring test results is improved. When any verification content is inconsistent with the initial wiring test results, the reliability of the corresponding initial wiring test results is reduced, and the reliability is converted into diagnostic confidence.

[0073] S43: When the diagnostic confidence level meets the output conditions, the initial wiring test result is determined as the final wiring test result.

[0074] Specifically, when the diagnostic confidence level meets the output conditions, the low-power intelligent detection circuit confirms that the initial wiring test result can be used as the test conclusion output, determines the initial wiring test result as the final wiring test result, and controls the indicator module to display whether the wiring is normal, the type of incorrect wiring, voltage information, or the test time. At the same time, it can output prompts corresponding to the final wiring test result through indicator lights and buzzers, so that the on-site operators can obtain a clear wiring test conclusion.

[0075] S44: When the diagnostic confidence does not meet the output conditions, reacquire valid sampling data, and re-perform wiring status identification and consistency verification based on the reacquired valid sampling data to regenerate the final wiring test result.

[0076] Specifically, when the diagnostic confidence level does not meet the output conditions, the low-power intelligent detection circuit does not output the initial wiring detection result as the final wiring detection result, and triggers the re-closing of the data window or extends the sampling time, so that the pin assembly maintains or re-forms a stable contact with the terminal of the tested direct three-phase energy meter. After obtaining the terminal detection signal again, it performs sampling processing, wiring status identification and consistency verification again until the diagnostic confidence level meets the output conditions and then regenerates the final wiring detection result.

[0077] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A direct-type three-phase energy meter wiring detection device, characterized in that, The device includes a housing (6) and a pin assembly (1), an AD sampling module (2), a low-power intelligent detection circuit (3), an indicator module (4) and a power module (5) disposed in the housing (6). The pin assembly (1) is disposed on one side of the housing (6). The pin assembly (1) includes multiple pins. The multiple pins are arranged along the terminal arrangement direction of the terminal of the direct three-phase energy meter under test, and are respectively used to abut against the voltage terminal, neutral terminal and current terminal in the terminal of the direct three-phase energy meter under test. The outer casing (6) and the pin assembly (1) form a docking and limiting relationship with the terminal (7) of the tested direct three-phase energy meter, so that the multiple pins remain in contact with the corresponding terminal. The pin assembly (1) is electrically connected to the AD sampling module (2), the AD sampling module (2) is electrically connected to the low-power intelligent detection circuit (3), and the low-power intelligent detection circuit (3) is electrically connected to the indicator module (4). The power module (5) is located inside the housing (6) and is electrically connected to the AD sampling module (2), the low-power intelligent detection circuit (3) and the indicator module (4) respectively.

2. The direct-type three-phase energy meter wiring detection device according to claim 1, characterized in that, The multiple pins include a voltage detection pin for contacting the voltage terminals of each phase, a neutral detection pin for contacting the neutral terminal, and a current detection pin for contacting the current terminals of each phase. The voltage detection pin, the neutral detection pin, and the current detection pin are all electrically connected to the AD sampling module (2).

3. The direct-type three-phase energy meter wiring detection device according to claim 1, characterized in that, The ejector pin assembly (1) also includes a protective cover connected to the housing (6) and used to cover or expose the plurality of ejector pins.

4. Based on claim 1 3. The method for testing the wiring of a direct three-phase energy meter as described in any one of the claims is characterized in that, The method includes: When the pin assembly is in contact with the corresponding terminals of the tested direct three-phase energy meter, the contact status of each terminal and the terminal detection signal are obtained. The terminal detection signal is sampled and processed to obtain valid sampled data; Based on the valid sampled data and the contact state, the wiring status is identified to obtain the initial wiring detection result; The initial wiring test results are validated for consistency, a diagnostic confidence level is generated, and the final wiring test results are output based on the initial wiring test results and the diagnostic confidence level.

5. The direct three-phase energy meter wiring detection method according to claim 4, characterized in that, When the pin assembly abuts against the corresponding terminals of the tested direct-type three-phase energy meter, the contact status and terminal detection signals of each terminal are acquired, including: Based on the corresponding contact relationship between the pin assembly and the terminal of the tested direct three-phase energy meter, the terminal connection relationship between each pin and each terminal is determined. Based on the terminal connection relationship, the contact voltage drop or microcurrent loop state formed by each pin at the corresponding terminal is collected to obtain the contact state of each terminal. When the contact state meets the contact reliability requirements, the voltage and current signals of each terminal are collected by the pin assembly to obtain the terminal detection signal.

6. The method for testing the wiring of a direct-type three-phase energy meter according to claim 5, characterized in that, Based on the terminal connection relationship, the contact voltage drop or micro-current loop state formed by each pin at the corresponding terminal is collected to obtain the contact state of each terminal, including: Acquire the contact voltage drop data and / or micro-current loop data formed by each ejector pin at the corresponding terminal; By associating the contact voltage drop data and the microcurrent loop data with the terminal docking relationship, terminal contact data is obtained; The contact reliability of each terminal is determined based on the terminal contact data, and the contact state of each terminal is obtained.

7. The direct three-phase energy meter wiring detection method according to claim 4, characterized in that, The sampling and processing of the terminal detection signal to obtain valid sampled data includes: The terminal detection signal is converted from analog to digital to obtain initial sampling data; Perform channel self-testing and phase compensation on the initial sampled data to obtain compensated sampled data; The compensated sampling data is synchronized and aligned, and abnormal windows are removed from the synchronized and aligned compensated sampling data to obtain the valid sampling data.

8. The method for testing the wiring of a direct-type three-phase energy meter according to claim 7, characterized in that, The process of synchronizing and aligning the compensated sampling data, and then removing abnormal windows from the synchronized and aligned compensated sampling data to obtain the valid sampling data, includes: Based on the sampling timing corresponding to each terminal block, the compensation sampling data is synchronized and aligned to obtain synchronized sampling data; Perform residual consistency judgment on the synchronously sampled data to determine the abnormal sampling window; The valid sampling data is obtained by removing the sampling data corresponding to the abnormal sampling window.

9. The direct three-phase energy meter wiring detection method according to claim 4, characterized in that, The step of identifying the wiring status based on the valid sampled data and the contact status to obtain the initial wiring detection result includes: The voltage, current, and phase characteristics of each terminal are extracted from the valid sampled data to obtain the terminal state characteristics; By associating the terminal state characteristics with the contact state, wiring characteristics are obtained; Based on the matching relationship between the wiring characteristics and the preset wiring model, the normal wiring state or the incorrect wiring state is determined, and the initial wiring detection result is obtained.

10. The method for testing the wiring of a direct-type three-phase energy meter according to claim 9, characterized in that, The process of performing consistency verification on the initial wiring test results, generating diagnostic confidence levels, and outputting final wiring test results based on the initial wiring test results and the diagnostic confidence levels includes: Based on the terminal state characteristics, the contact state, and the initial wiring detection results, the amplitude constraint, phasor diagram consistency, sequence component characteristics, and higher harmonic characteristics are checked to obtain the check results; The reliability of the initial wiring test results is evaluated based on the verification results, and the diagnostic confidence level is generated. When the diagnostic confidence level meets the output condition, the initial wiring detection result is determined as the final wiring detection result; When the diagnostic confidence level does not meet the output conditions, the valid sampled data is reacquired, and the wiring status identification and consistency verification are re-performed based on the reacquired valid sampled data to regenerate the final wiring detection result.

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