A method and device for judging metering circuit wiring suitable for multi-loop

Abstract

This invention relates to the field of electrical variable measurement technology, and more particularly to a method and apparatus for determining the wiring of metering circuits adaptable to multiple circuits. The method includes steps S1, where a signal host controller sends a signal generation command to a signal generator based on human-machine interaction information; step S2, where a signal acquisition device collects signal analysis information obtained after sending detection signals to the metering circuit; step S3, where the signal analysis information is preprocessed to obtain digitized signal data, and the digitized signal data is sent to the detection host controller; and step S4, where digitized signal data is received from a signal processor, and detection result information is generated based on the digitized signal data. This invention achieves phase detection, polarity detection, and fault diagnosis of metering circuit wiring without relying on physical disconnection and extensive manual labor, and is adaptable to multi-circuit metering circuit wiring determination, thus improving the efficiency of metering circuit wiring determination.

Description

Technical Field

[0001] This invention relates to the field of electrical variable measurement technology, and in particular to a method and device for determining the wiring of metering circuits that are adaptable to multiple circuits. Background Technology

[0002] Before power metering devices are put into operation, the wiring correctness must be checked according to regulations. Since the newly installed equipment is not energized, on-site wiring verification is necessary. Currently, the main methods include the multimeter continuity test, the dry cell battery lamp test, and the relay protection test. However, existing technologies have significant drawbacks. The first two methods require disassembling the secondary circuit wires, and during restoration, human error can easily lead to loose or incorrect connections, making it impossible to guarantee the accuracy after restoration. Long-distance circuits in power plants require simultaneous operation by personnel at both ends, rely on reliable communication, and require at least four experienced personnel, resulting in high coordination costs and a high risk of misjudgment. The customer-side switch cabinet space is confined, making it easy to bump into things during operation. The high position of the transformer metering box increases the risk of falls from height when disconnecting wires. Although relay protection testers are powerful, they are bulky, require mains power, and involve a large amount of preparation work, making them cumbersome and impractical for single-circuit wiring verification. In summary, the existing technology, which relies on physical disconnection and a large amount of manual labor, has become a bottleneck restricting the efficiency, accuracy, and safety of metering operation. A new, efficient, and safe testing solution that eliminates the need for wire disconnection is urgently needed.

[0003] Chinese patent application CN110632448A discloses a wiring detection method for a three-phase three-wire metering device with a current transformer. The method includes the following steps: Step S1, using a bridge device with an impedance measurement circuit to measure the impedance value of the target metering device's current circuit, and determining the wiring status of the current circuit based on the measurement result; Step S2, using the same bridge device to measure the impedance value of the target metering device's voltage circuit, and determining the wiring status of the voltage circuit based on the measurement result. This method effectively detects the metering device by verifying the impedance values ​​of the current and voltage circuits in the metering circuit without energizing or disconnecting the wiring using only a bridge device. This reduces the risk of wiring errors or reverse polarity, accurately pinpoints wiring errors, improves work efficiency, and reduces unnecessary power supply disputes. While this solution avoids the basic model of physical disconnection and extensive manual labor, it still cannot achieve phase detection, polarity detection, and fault diagnosis of the metering circuit wiring, nor can it achieve multi-circuit, multi-adaptive metering circuit wiring detection, making it neither highly efficient nor safe. Summary of the Invention

[0004] To address this, the present invention provides a method and apparatus for judging the wiring of metering circuits that are adaptable to multiple circuits. This overcomes the problems of the existing technology, which still relies on physical disconnection and a large amount of manual labor, making it impossible to perform phase detection, polarity detection, and fault diagnosis of the circuit for judging the wiring of metering circuits. It also fails to perform multi-circuit multi-adaptive metering circuit wiring judgment, resulting in low efficiency in judging the wiring of metering circuits.

[0005] To achieve the above objectives, in one aspect, the present invention provides a method for determining the wiring of a multi-circuit metering circuit, comprising:

[0006] Step S1: The signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, and the signal generator generates a pre-coded signal according to the signal generation command.

[0007] Step S2: The pre-coded signal is sent to the metering loop as a detection signal, and the signal analysis information obtained after sending the detection signal to the metering loop is collected by the signal acquisition device.

[0008] Step S3: The signal analysis information is preprocessed by the signal processor to obtain digital signal data, and the digital signal data is sent to the detection host controller;

[0009] Step S4: The host controller receives digital signal data from the signal processor and generates detection result information based on the digital signal data;

[0010] In step S4, the detection host controller performs real-time analysis on the received digital signal data and extracts key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude, and loop impedance.

[0011] When the number of metering loops is greater than 1, the key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal tag encoding.

[0012] Further, in step S1, the signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, specifically as follows:

[0013] Step S11: Obtain the test parameter setting information from the human-machine interaction information through the signal host controller;

[0014] Step S12: If the test parameter information is set to the selected transformer model, the preset detection signal parameter generation command corresponding to the preset selected transformer model in the transformer parameter library that is consistent with the selected transformer model is used as the signal generation command.

[0015] Step S13: If the test parameter information is set to manually set the detection signal parameters, the manually set detection signal parameters are used as the signal generation command.

[0016] Further, in step S1, the signal generator generates a pre-coded signal according to the signal generation command, specifically as follows:

[0017] Step S111: Generate an initial coded signal according to the signal type, feature parameters, and signal timing in the signal generation command;

[0018] Step S112: The initial encoded signal is enhanced and adapted by the signal conditioning unit in the signal generator to obtain a pre-coded signal, wherein:

[0019] When the metering circuit is a current secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection current signal sent to the current secondary circuit, and the detection current signal is a constant current source.

[0020] When the metering circuit is a voltage secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection voltage signal sent to the voltage secondary circuit, and the detection voltage signal is a constant voltage source.

[0021] Further, in step S2, the pre-coded signal is sent to the metering loop as a detection signal, specifically as follows:

[0022] When the metering circuit is a current secondary circuit, the detected current signal is injected into the metering circuit in series according to the signal timing in the signal generation command.

[0023] When the metering circuit is a voltage secondary circuit, the detected voltage signal is injected into the metering circuit in parallel according to the signal timing in the signal generation command.

[0024] Further, in step S2, the signal analysis information obtained after sending the detection signal to the metering loop is acquired by the signal acquisition device, specifically as follows:

[0025] When the metering circuit is a current secondary circuit, the wires of the metering circuit are clamped non-contactly by the miniature clamp sensor of the signal acquisition device to collect the induced current signal generated by the detected current signal as signal analysis information;

[0026] When the metering circuit is a voltage secondary circuit, the signal probe of the signal acquisition device contacts the voltage terminal of the metering circuit to acquire the induced voltage signal generated by the detected voltage signal, which is used as signal analysis information.

[0027] The miniature clamp sensor and the signal probe transmit the collected analog signal analysis information to the signal processor in the detection host.

[0028] Further, in step S3, the signal analysis information is preprocessed by a signal processor to obtain digitized signal data, and the digitized signal data is sent to the detection host controller, specifically as follows:

[0029] Step S31: The signal processor receives analog signal analysis information from the signal acquisition unit. The signal processor first amplifies the signal analysis information using its internal preamplifier to obtain amplified signal analysis information.

[0030] Step S32: The electromagnetic noise mixed in the amplified signal analysis information is filtered out by the hardware filter in the signal processor to obtain the filtered signal analysis information.

[0031] Step S33: Use a Schmitt trigger to shape the filtered signal analysis information into a digital square wave to obtain the shaped analog signal.

[0032] Step S34: Convert the shaped normalized analog signal into digital signal data using an analog-to-digital converter;

[0033] In step S35, the signal processor sends the generated digital signal data to the detection host controller via the internal data bus.

[0034] Further, in step S4, the host controller receives digitized signal data from the signal processor and generates detection result information based on the digitized signal data. The detection result information includes phase detection information, polarity detection information, and fault diagnosis information. The fault diagnosis information includes open-circuit / open-circuit detection information and short-circuit detection information, specifically:

[0035] Step S41: The host controller detects the received digital signal data and performs real-time analysis to extract key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude and loop impedance. The phase identification information refers to digital signal data that can identify the phase, including pulse width and number of sine wave cycles.

[0036] Step S42, Phase detection information generation:

[0037] When the phase identification information is a pulse width:

[0038] If a pulse width of 1ms is detected, the phase detection information generated is phase A;

[0039] If a pulse width of 2ms is detected, the phase detection information generated is phase B;

[0040] If a pulse width of 3ms is detected, the phase detection information generated is phase C;

[0041] When the phase identification information is the number of sine wave periods:

[0042] If the number of sine wave cycles detected is 1 sine wave cycle, then the phase detection information generated is phase A;

[0043] If two sine wave cycles are detected, then the phase detection information generated is phase B.

[0044] If the number of sine wave cycles identified is 3, then the phase detection information generated is phase C;

[0045] Step S43, Polarity detection information generation:

[0046] If the detected initial phase of the signal is consistent with the reference phase injected by the signal host, then the generated polarity detection information indicates that the polarity is correct.

[0047] If the initial phase of the detected signal is opposite to the reference phase, then the polarity detection information generated is reverse polarity.

[0048] Step S44, Fault diagnosis information generation:

[0049] The host controller performs fault logic judgment based on the presence of digital signal data, signal amplitude, and loop impedance.

[0050] Open circuit / closed circuit detection information:

[0051] If no digital signal data exists, an open circuit / broken circuit detection message is generated indicating the presence of an open circuit.

[0052] If digital signal data exists, the open circuit / break detection information will be generated as no loop is open.

[0053] Short circuit detection information:

[0054] When the metering circuit is a voltage secondary circuit, if there is a signal amplitude F < preset low signal amplitude FO and the circuit impedance R < preset normal circuit impedance R0, then a short circuit detection information is generated indicating that there is a voltage circuit short circuit.

[0055] Otherwise, the generated short-circuit detection information indicates that there is no short circuit in the voltage loop;

[0056] When the metering circuit is a current secondary circuit, if the metering circuit terminal voltage U is measured to be less than the preset abnormal metering circuit terminal voltage U0 after the detection current signal is injected, then the short circuit detection information is generated as a current circuit short circuit.

[0057] Otherwise, the generated short-circuit detection information indicates that the current loop is not short-circuited.

[0058] Furthermore, in step S4, when the number of metering loops is greater than 1, the detection signal sent by each signal host is set with a detection signal mark code according to the mark of the loop to be detected. The detection signal mark code is set as the mark of the loop to be detected. The key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal mark code.

[0059] On the other hand, the present invention also provides a metering circuit wiring judgment device adaptable to multiple circuits, comprising:

[0060] A signal host is used to send detection signals to a metering circuit, which includes a current secondary circuit and a voltage secondary circuit. The detection signals include a detection current signal sent to the current secondary circuit and a detection voltage signal sent to the voltage secondary circuit. The signal host includes a signal host battery, a signal host button, a signal host controller, a signal host LCD screen, and a signal generator, wherein:

[0061] The signal host battery provides power to ensure that the device can work independently in environments without mains power. It is connected to the signal host buttons, signal host controller, signal host LCD screen, and signal generator.

[0062] The signal host button is used for operators to perform human-machine interaction to obtain human-machine interaction information, including signal host power-on and power-off information, test parameter setting information, and signal transmission start and stop information. It is connected to the signal host controller and inputs the human-machine interaction information to the signal host controller.

[0063] The signal host controller is the control core of the signal host. It is used to respond to human-machine interaction information, control the display content of the signal host LCD screen, send signal generation commands to the signal generator to control it to generate a preset coded signal, send the preset coded signal as a detection signal to the metering loop, and manage the signal host battery. It is connected to the signal host battery, signal host buttons, signal host LCD screen, and signal generator.

[0064] The signal host LCD screen is used to display the display content sent by the signal host controller. The display content includes human-computer interaction process information, human-computer interaction information and detection result information. It is connected to the signal host controller.

[0065] A signal generator, which generates a pre-coded signal according to the signal generation command, is connected to a signal host controller;

[0066] A detection host, used to judge the detection result information based on the detection signal, includes a detection host battery, detection host buttons, a detection host controller, a detection host LCD screen, a signal acquisition unit, and a signal processor, wherein:

[0067] The main unit battery provides power and is connected to the main unit buttons, main unit controller, main unit LCD screen, signal acquisition unit, and signal processor.

[0068] The test host button is used for human-machine interaction by the operator to obtain test interaction information. The test interaction information includes test host power on / off information, selection of current transformer model information, selection of test mode information, viewing of test results information, and confirmation of results information. It is connected to the test host controller and inputs the test interaction information to the test host controller.

[0069] The detection host controller is the control core of the detection host. It is used to respond to detection interaction information, control the detection display content of the detection host LCD screen, receive digital signal data from the signal processor, generate detection result information based on the digital signal data, and manage the detection host battery. It is connected to the detection host battery, detection host buttons, detection host LCD screen, and signal processor.

[0070] The detection host LCD screen is used to display the detection display content sent by the detection host controller, wherein the detection display content is the detection result information;

[0071] A signal acquisition unit is used to acquire signal analysis information, including induced current signals and induced voltage signals. The signal acquisition unit includes a miniature clamp sensor and a signal probe. The miniature clamp sensor is used to non-contactly acquire the induced current signal generated based on the detected current signal in the current secondary circuit. It is connected to a signal processor and sends the induced current signal to the signal acquisition unit. The signal probe is used to contactively acquire the induced voltage signal generated based on the detected voltage signal in the voltage secondary circuit. It directly contacts the voltage terminal. The signal probe is connected to the signal processor and sends the induced voltage signal to the signal acquisition unit.

[0072] A signal processor is used to preprocess signal analysis information to obtain digital signal data, and it is connected to the detection host controller.

[0073] Furthermore, when the number of metering loops is greater than 1, each metering loop is regarded as a loop to be tested. The number of signal hosts ne is limited according to the number of loops to be tested nu, and ne=nu is set. The detection signal sent by each signal host is set with a detection signal mark code according to the loop to be tested mark, and the detection signal mark code is set as the loop to be tested mark.

[0074] Compared with the prior art, the beneficial effects of the present invention are as follows: The method, in step S1, sends a signal generation command to the signal generator based on human-computer interaction information, and generates a pre-coded signal according to the signal generation command. This provides a flexible signal source for single-loop and multi-loop judgment, and generates detection signals electronically and programmatically, completely replacing the traditional method that requires manual generation of test signals using tools such as dry batteries and multimeters. This avoids physical connection and disconnection, reducing manual operation steps. In step S2, the method sends the pre-coded signal as a detection signal to the metering loop, and a signal acquisition device collects the signal analysis information obtained after sending the detection signal to the metering loop. This achieves the core operation without relying on physical disconnection. Step S2 supports data acquisition for multi-loop judgment. The method preprocesses the signal analysis information in step S3 to obtain digital signal data, and sends the digital signal data to the detection host controller to provide a high-quality data foundation for phase detection, polarity detection, and fault diagnosis. This replaces the tedious process of manually observing oscilloscope waveforms, recording and calculating in traditional methods, further accelerating data processing speed and reducing human error. Step S4 generates detection result information based on the digital signal data to realize phase detection, polarity detection and fault diagnosis of the circuit, and finally completes the multi-loop metering circuit wiring judgment. Thus, the core objective of improving the efficiency of metering circuit wiring judgment is achieved without relying on physical disconnection and a large amount of manual labor. Attached Figure Description

[0075] Figure 1 This is a flowchart illustrating the method for determining the wiring of multi-circuit metering circuits in this embodiment.

[0076] Figure 2 This is a schematic diagram of the structure of the metering circuit wiring judgment device adapted to multiple circuits in this embodiment. Detailed Implementation

[0077] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0078] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0079] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0080] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Please see Figure 1 As shown, this is a flowchart illustrating the multi-circuit metering circuit wiring determination method of this embodiment. The method includes:

[0082] Step S1: The signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, and the signal generator generates a pre-coded signal according to the signal generation command.

[0083] Step S2: The pre-coded signal is sent to the metering loop as a detection signal, and the signal analysis information obtained after sending the detection signal to the metering loop is collected by the signal acquisition device.

[0084] Step S3: The signal analysis information is preprocessed by the signal processor to obtain digital signal data, and the digital signal data is sent to the detection host controller;

[0085] Step S4: The host controller receives digital signal data from the signal processor and generates detection result information based on the digital signal data;

[0086] In step S4, the detection host controller performs real-time analysis on the received digital signal data and extracts key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude, and loop impedance.

[0087] When the number of metering loops is greater than 1, the key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal tag encoding.

[0088] Specifically, the method is applicable not only to single-loop metering circuit wiring judgment but also to multi-loop metering circuit wiring judgment, enabling phase detection, polarity detection, and fault diagnosis of metering circuit wiring. This improves the efficiency of metering circuit wiring judgment without relying on physical disconnection and extensive manual labor. In step S1, the method sends a signal generation command to a signal generator based on human-machine interaction information and generates a pre-coded signal according to the command. This provides a flexible signal source for single-loop and multi-loop judgment and generates detection signals electronically and programmatically, completely replacing the traditional method that requires manual generation of test signals using tools such as dry batteries and multimeters. This avoids physical connections and disconnections, reducing manual operations. In step S2, the method sends the pre-coded signal as a detection signal to the metering circuit and uses signal acquisition... The collector acquires signal analysis information obtained after sending detection signals to the metering circuit, thereby realizing the core operation without relying on physical disconnection. Step S2 supports data acquisition for multi-circuit judgment. Step S3 preprocesses the signal analysis information to obtain digitized signal data, which is then sent to the detection host controller. This provides a high-quality data foundation for phase detection, polarity detection, and fault diagnosis, replacing the tedious process of manually observing oscilloscope waveforms, recording, and calculating in traditional methods. This further accelerates data processing speed and reduces human error. Step S4 generates detection result information based on the digitized signal data to achieve phase detection, polarity detection, and fault diagnosis of the circuit, ultimately completing the multi-circuit metering circuit wiring judgment. This achieves the core objective of improving the efficiency of metering circuit wiring judgment without relying on physical disconnection and extensive manual labor.

[0089] Specifically, in step S1, the signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, specifically as follows:

[0090] Step S11: Obtain the test parameter setting information from the human-machine interaction information through the signal host controller;

[0091] Step S12: If the test parameter information is set to the selected transformer model, the preset detection signal parameter generation command corresponding to the preset selected transformer model in the transformer parameter library that is consistent with the selected transformer model is used as the signal generation command.

[0092] Step S13: If the test parameter information is set to manually set the detection signal parameters, the manually set detection signal parameters are used as the signal generation command.

[0093] Specifically, the setting test parameter information refers to the input information configured by the user for this testing task, including selecting the current transformer model and manually setting the test signal parameters. The selected current transformer model refers to the current transformer model actually used in the circuit to be tested, which the user selects from the preset list. The manually set test signal parameters refer to the specific specifications of the signal directly input by the user when the current transformer model is not in the preset list or when the user needs to perform special tests. The current transformer parameter library refers to the database stored inside the signal host controller, which contains the preset selected current transformer models and the preset test signal parameter generation commands corresponding to each preset selected current transformer model.

[0094] Specifically, in step S1, the signal generator generates a pre-coded signal according to the signal generation command, specifically as follows:

[0095] Step S111: Generate an initial coded signal according to the signal type, feature parameters, and signal timing in the signal generation command;

[0096] Step S112: The initial encoded signal is enhanced and adapted by the signal conditioning unit in the signal generator to obtain a pre-coded signal, wherein:

[0097] When the metering circuit is a current secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection current signal sent to the current secondary circuit, and the detection current signal is a constant current source.

[0098] When the metering circuit is a voltage secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection voltage signal sent to the voltage secondary circuit, and the detection voltage signal is a constant voltage source.

[0099] Specifically, the signal type refers to the basic waveform of the detection signal, the feature parameter refers to the specific physical characteristics of the signal, the signal timing refers to the time pattern of signal transmission, the initial encoded signal refers to the raw electrical signal generated by the signal generator without power amplification, and the signal conditioning unit refers to the hardware circuit in the signal generator, which is used to strengthen and adapt the fragile initial encoded signal.

[0100] Specifically, in step S2, the pre-coded signal is sent to the metering loop as a detection signal, specifically as follows:

[0101] When the metering circuit is a current secondary circuit, the detected current signal is injected into the metering circuit in series according to the signal timing in the signal generation command.

[0102] When the metering circuit is a voltage secondary circuit, the detected voltage signal is injected into the metering circuit in parallel according to the signal timing in the signal generation command.

[0103] Specifically, the series injection refers to connecting the two output terminals of the signal host in series into the disconnected circuit, and the parallel injection refers to connecting the two output terminals of the signal host directly in parallel to the two terminals of the voltage circuit.

[0104] Specifically, in step S2, the signal analysis information obtained after sending the detection signal to the metering circuit is acquired by the signal acquisition device, specifically as follows:

[0105] When the metering circuit is a current secondary circuit, the wires of the metering circuit are clamped non-contactly by the miniature clamp sensor of the signal acquisition device to collect the induced current signal generated by the detected current signal as signal analysis information;

[0106] When the metering circuit is a voltage secondary circuit, the signal probe of the signal acquisition device contacts the voltage terminals (phase line and neutral line) of the metering circuit to acquire the induced voltage signal generated by the detected voltage signal as signal analysis information;

[0107] The miniature clamp sensor and the signal probe transmit the collected analog signal analysis information to the signal processor in the detection host.

[0108] Specifically, in step S3, the signal analysis information is preprocessed by a signal processor to obtain digital signal data, and the digital signal data is sent to the detection host controller.

[0109] Step S31: The signal processor receives analog signal analysis information from the signal acquisition unit. The signal processor first amplifies the signal analysis information using its internal preamplifier to obtain amplified signal analysis information.

[0110] Step S32: The electromagnetic noise mixed in the amplified signal analysis information is filtered out by the hardware filter in the signal processor to obtain the filtered signal analysis information.

[0111] Step S33: Use a Schmitt trigger to shape the filtered signal analysis information into a digital square wave to obtain the shaped analog signal.

[0112] Step S34: Convert the shaped normalized analog signal into digital signal data using an analog-to-digital converter;

[0113] In step S35, the signal processor sends the generated digital signal data to the detection host controller via the internal data bus.

[0114] Specifically, in step S4, the host controller receives digitized signal data from the signal processor and generates detection result information based on the digitized signal data. The detection result information includes phase detection information, polarity detection information, and fault diagnosis information. The fault diagnosis information includes open-circuit / open-circuit detection information and short-circuit detection information, specifically:

[0115] Step S41: The host controller detects the received digital signal data and performs real-time analysis to extract key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude and loop impedance. The phase identification information refers to digital signal data that can identify the phase, including pulse width and number of sine wave cycles.

[0116] Step S42, Phase detection information generation:

[0117] When the phase identification information is a pulse width:

[0118] If a pulse width of 1ms is detected, the phase detection information generated is phase A;

[0119] If a pulse width of 2ms is detected, the phase detection information generated is phase B;

[0120] If a pulse width of 3ms is detected, the phase detection information generated is phase C;

[0121] When the phase identification information is the number of sine wave periods:

[0122] If the number of sine wave cycles detected is 1 sine wave cycle, then the phase detection information generated is phase A;

[0123] If two sine wave cycles are detected, then the phase detection information generated is phase B.

[0124] If the number of sine wave cycles identified is 3, then the phase detection information generated is phase C;

[0125] Step S43, Polarity detection information generation:

[0126] If the detected initial phase of the signal is consistent with the reference phase injected by the signal host, then the generated polarity detection information indicates that the polarity is correct.

[0127] If the initial phase of the detected signal is opposite to the reference phase, then the polarity detection information generated is reverse polarity.

[0128] Step S44, Fault diagnosis information generation:

[0129] The host controller performs fault logic judgment based on the presence of digital signal data, signal amplitude, and loop impedance.

[0130] Open circuit / closed circuit detection information:

[0131] If no digital signal data exists, an open circuit / broken circuit detection message is generated indicating the presence of an open circuit.

[0132] If digital signal data exists, the open circuit / break detection information will be generated as no loop is open.

[0133] Short circuit detection information:

[0134] When the metering circuit is a voltage secondary circuit, if there is a signal amplitude F < preset low signal amplitude FO and the circuit impedance R < preset normal circuit impedance R0, then a short circuit detection information is generated indicating that there is a voltage circuit short circuit.

[0135] Otherwise, the generated short-circuit detection information indicates that there is no short circuit in the voltage loop;

[0136] When the metering circuit is a current secondary circuit, if the metering circuit terminal voltage U is measured to be less than the preset abnormal metering circuit terminal voltage U0 after the detection current signal is injected, then the short circuit detection information is generated as a current circuit short circuit.

[0137] Otherwise, the generated short-circuit detection information indicates that the current loop is not short-circuited.

[0138] Specifically, the preset low signal amplitude FO refers to the preset signal amplitude used to determine a short circuit in the voltage loop, set to 50%-70% of the expected normal value. For example, if the expected normal value is 3V, the preset low signal amplitude FO can be set to 1.5V~2.1V. It can be set according to the standard load calibration at the factory. The preset normal loop impedance R0 refers to the preset loop impedance value used to determine a short circuit in the voltage loop, which is much lower than the normal impedance value. For example, if the impedance of a normal loop is above 50Ω, then R0 will be set to a very small value, such as 1Ω~10Ω. The preset abnormal metering loop terminal voltage U0 refers to the preset value of the metering loop terminal voltage used to determine a short circuit in the current secondary loop, set to a very low millivolt level voltage. For example, when injecting a 10mA current, the normal loop terminal voltage may be in the range of 1-10mV, then U0 can be set to 0.5mV. If the measured terminal voltage U<0.5mV, it is determined that the current loop is short-circuited.

[0139] Specifically, in step S4, when the number of metering loops is greater than 1, the detection signal sent by each signal host is set with a detection signal mark code according to the mark of the loop to be detected. The detection signal mark code is set as the mark of the loop to be detected. The key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal mark code.

[0140] Please see Figure 2 As shown, this is a structural schematic diagram of the metering circuit wiring judgment device adapted to multiple circuits in this embodiment. The device includes:

[0141] A signal host is used to send detection signals to a metering circuit, which includes a current secondary circuit and a voltage secondary circuit. The detection signals include a detection current signal sent to the current secondary circuit and a detection voltage signal sent to the voltage secondary circuit. The signal host includes a signal host battery, a signal host button, a signal host controller, a signal host LCD screen, and a signal generator, wherein:

[0142] The signal host battery provides power to ensure that the device can work independently in environments without mains power. It is connected to the signal host buttons, signal host controller, signal host LCD screen, and signal generator.

[0143] The signal host button is used for operators to perform human-machine interaction to obtain human-machine interaction information, including signal host power-on and power-off information, test parameter setting information, and signal transmission start and stop information. It is connected to the signal host controller and inputs the human-machine interaction information to the signal host controller.

[0144] The signal host controller is the control core of the signal host. It is used to respond to human-machine interaction information, control the display content of the signal host LCD screen, send signal generation commands to the signal generator to control it to generate a preset coded signal, send the preset coded signal as a detection signal to the metering loop, and manage the signal host battery. It is connected to the signal host battery, signal host buttons, signal host LCD screen, and signal generator.

[0145] The signal host LCD screen is used to display the display content sent by the signal host controller. The display content includes human-computer interaction process information, human-computer interaction information and detection result information. It is connected to the signal host controller.

[0146] A signal generator, which generates a pre-coded signal according to the signal generation command, is connected to a signal host controller;

[0147] A detection host, used to judge the detection result information based on the detection signal, includes a detection host battery, detection host buttons, a detection host controller, a detection host LCD screen, a signal acquisition unit, and a signal processor, wherein:

[0148] The main unit battery provides power and is connected to the main unit buttons, main unit controller, main unit LCD screen, signal acquisition unit, and signal processor.

[0149] The test host button is used for human-machine interaction by the operator to obtain test interaction information. The test interaction information includes test host power on / off information, selection of current transformer model information, selection of test mode information, viewing of test results information, and confirmation of results information. It is connected to the test host controller and inputs the test interaction information to the test host controller.

[0150] The detection host controller is the control core of the detection host. It is used to respond to detection interaction information, control the detection display content of the detection host LCD screen, receive digital signal data from the signal processor, generate detection result information based on the digital signal data, and manage the detection host battery. It is connected to the detection host battery, detection host buttons, detection host LCD screen, and signal processor.

[0151] The detection host LCD screen is used to display the detection display content sent by the detection host controller, wherein the detection display content is the detection result information;

[0152] A signal acquisition unit is used to acquire signal analysis information, including induced current signals and induced voltage signals. The signal acquisition unit includes a miniature clamp sensor and a signal probe. The miniature clamp sensor is used to non-contactly acquire the induced current signal generated based on the detected current signal in the current secondary circuit. It is connected to a signal processor and sends the induced current signal to the signal acquisition unit. The signal probe is used to contactively acquire the induced voltage signal generated based on the detected voltage signal in the voltage secondary circuit. It directly contacts the voltage terminal. The signal probe is connected to the signal processor and sends the induced voltage signal to the signal acquisition unit.

[0153] A signal processor is used to preprocess signal analysis information to obtain digital signal data, and it is connected to the detection host controller.

[0154] Specifically, when the number of metering loops is greater than 1, each metering loop is regarded as a loop to be tested. The number of signal hosts ne is limited according to the number of loops to be tested nu, and ne=nu is set. The detection signal sent by each signal host is set with a detection signal mark code according to the loop to be tested mark, and the detection signal mark code is set as the loop to be tested mark.

[0155] Specifically, this embodiment does not limit the form of the test loop marking. Those skilled in the art can freely set it according to the actual situation, as long as it meets the requirement of distinguishing each test loop in multiple metering loops. For example, the test loop markings of each test loop can be set to different numerical IDs, such as 001, 002, 003, for each test loop in multiple metering loops.

[0156] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for determining the wiring of a multi-circuit metering circuit, characterized in that, include: Step S1: The signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, and the signal generator generates a pre-coded signal according to the signal generation command. Step S2: The pre-coded signal is sent to the metering loop as a detection signal, and the signal analysis information obtained after sending the detection signal to the metering loop is collected by the signal acquisition device. Step S3: The signal analysis information is preprocessed by the signal processor to obtain digital signal data, and the digital signal data is sent to the detection host controller; Step S4: The host controller receives digital signal data from the signal processor and generates detection result information based on the digital signal data; In step S4, the detection host controller performs real-time analysis on the received digital signal data and extracts key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude, and loop impedance. When the number of metering loops is greater than 1, the key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal tag encoding; In step S4, the host controller receives digitized signal data from the signal processor and generates detection result information based on the digitized signal data. The detection result information includes phase detection information, polarity detection information, and fault diagnosis information. The fault diagnosis information includes open-circuit / open-circuit detection information and short-circuit detection information, specifically: Step S41: The host controller detects the real-time analysis of the received digital signal data and extracts key feature parameters for judgment, including phase identification information, signal start phase, signal amplitude and loop impedance. The phase identification information refers to the digital signal data that can identify the phase, including pulse width and number of sine wave cycles. Step S42, Phase detection information generation: When the phase identification information is a pulse width: If a pulse width of 1ms is detected, the phase detection information generated is phase A; If a pulse width of 2ms is detected, the phase detection information generated is phase B; If a pulse width of 3ms is detected, the phase detection information generated is phase C; When the phase identification information is the number of sine wave periods: If the number of sine wave cycles detected is 1 sine wave cycle, then the phase detection information generated is phase A; If two sine wave cycles are detected, then the phase detection information generated is phase B. If the number of sine wave cycles identified is 3, then the phase detection information generated is phase C; Step S43, Polarity detection information generation: If the detected initial phase of the signal is consistent with the reference phase injected by the signal host, then the generated polarity detection information indicates that the polarity is correct. If the initial phase of the detected signal is opposite to the reference phase, then the polarity detection information generated is reverse polarity. Step S44, Fault diagnosis information generation: The host controller performs fault logic judgment based on the presence of digital signal data, signal amplitude, and loop impedance. Open circuit / closed circuit detection information: If no digital signal data exists, an open circuit / broken circuit detection message is generated indicating the presence of an open circuit. If digital signal data exists, the open circuit / break detection information will be generated as no loop is open. Short circuit detection information: When the metering circuit is a voltage secondary circuit, if there is a signal amplitude F < preset low signal amplitude FO and the circuit impedance R < preset normal circuit impedance R0, then a short circuit detection information is generated indicating that there is a voltage circuit short circuit. Otherwise, the generated short-circuit detection information indicates that there is no short circuit in the voltage loop; When the metering circuit is a current secondary circuit, if the metering circuit terminal voltage U is measured to be less than the preset abnormal metering circuit terminal voltage U0 after the detection current signal is injected, then the short circuit detection information is generated as a current circuit short circuit. Otherwise, the short-circuit detection information generated will indicate that the current loop is not short-circuited.

2. The method for determining the wiring of a multi-circuit metering circuit according to claim 1, characterized in that, In step S1, the signal host controller sends a signal generation command to the signal generator based on the human-machine interaction information, specifically as follows: Step S11: Obtain the test parameter setting information from the human-machine interaction information through the signal host controller; Step S12: If the test parameter information is set to the selected transformer model, the preset detection signal parameter generation command corresponding to the preset selected transformer model in the transformer parameter library that is consistent with the selected transformer model is used as the signal generation command. Step S13: If the test parameter information is set to manually set the detection signal parameters, the manually set detection signal parameters are used as the signal generation command.

3. The method for determining the wiring of multi-circuit metering circuits according to claim 2, characterized in that, In step S1, the signal generator generates a pre-coded signal according to the signal generation command, specifically as follows: Step S111: Generate an initial coded signal according to the signal type, feature parameters, and signal timing in the signal generation command; Step S112: The initial encoded signal is enhanced and adapted by the signal conditioning unit in the signal generator to obtain a pre-coded signal, wherein: When the metering circuit is a current secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection current signal sent to the current secondary circuit, and the detection current signal is a constant current source. When the metering circuit is a voltage secondary circuit, the signal conditioning unit enhances and adapts the initial encoded signal into a detection voltage signal sent to the voltage secondary circuit, and the detection voltage signal is a constant voltage source.

4. The method for determining the wiring of a multi-circuit metering circuit according to claim 3, characterized in that, In step S2, the pre-coded signal is sent to the metering loop as a detection signal, specifically as follows: When the metering circuit is a current secondary circuit, the detected current signal is injected into the metering circuit in series according to the signal timing in the signal generation command. When the metering circuit is a voltage secondary circuit, the detected voltage signal is injected into the metering circuit in parallel according to the signal timing in the signal generation command.

5. The method for determining the wiring of a multi-circuit metering circuit according to claim 4, characterized in that, In step S2, the signal analysis information obtained after sending the detection signal to the metering loop is acquired by the signal acquisition device, specifically as follows: When the metering circuit is a current secondary circuit, the wires of the metering circuit are clamped non-contactly by the miniature clamp sensor of the signal acquisition device to collect the induced current signal generated by the detected current signal as signal analysis information; When the metering circuit is a voltage secondary circuit, the signal probe of the signal acquisition device contacts the voltage terminal of the metering circuit to acquire the induced voltage signal generated by the detected voltage signal, which is used as signal analysis information. The miniature clamp sensor and the signal probe transmit the collected analog signal analysis information to the signal processor in the detection host.

6. The method for determining the wiring of a multi-circuit metering circuit according to claim 5, characterized in that, In step S3, the signal analysis information is preprocessed by a signal processor to obtain digitized signal data, and the digitized signal data is sent to the detection host controller. Specifically: Step S31: The signal processor receives analog signal analysis information from the signal acquisition unit. The signal processor first amplifies the signal analysis information using its internal preamplifier to obtain amplified signal analysis information. Step S32: The electromagnetic noise mixed in the amplified signal analysis information is filtered out by the hardware filter in the signal processor to obtain the filtered signal analysis information. Step S33: Use a Schmitt trigger to shape the filtered signal analysis information into a digital square wave to obtain the shaped analog signal. Step S34: Convert the shaped normalized analog signal into digital signal data using an analog-to-digital converter; In step S35, the signal processor sends the generated digital signal data to the detection host controller via the internal data bus.

7. The method for determining the wiring of a multi-circuit metering circuit according to claim 1, characterized in that, In step S4, when the number of metering loops is greater than 1, the detection signal sent by each signal host is set with a detection signal mark code according to the mark of the loop to be detected. The detection signal mark code is set as the mark of the loop to be detected. The key feature parameters obtained by the detection host controller from the received digital signal data also include the detection signal mark code.

8. An apparatus for determining the wiring of a multi-circuit metering circuit as described in any one of claims 1-7, characterized in that, include: A signal host is used to send detection signals to a metering circuit, which includes a current secondary circuit and a voltage secondary circuit. The detection signals include a detection current signal sent to the current secondary circuit and a detection voltage signal sent to the voltage secondary circuit. The signal host includes a signal host battery, a signal host button, a signal host controller, a signal host LCD screen, and a signal generator, wherein: The signal host battery provides power to ensure that the device can work independently in environments without mains power. It is connected to the signal host buttons, signal host controller, signal host LCD screen, and signal generator. The signal host button is used for operators to perform human-machine interaction to obtain human-machine interaction information, including signal host power-on and power-off information, test parameter setting information, and signal transmission start and stop information. It is connected to the signal host controller and inputs the human-machine interaction information to the signal host controller. The signal host controller is the control core of the signal host. It is used to respond to human-machine interaction information, control the display content of the signal host LCD screen, send signal generation commands to the signal generator to control it to generate a preset coded signal, send the preset coded signal as a detection signal to the metering loop, and manage the signal host battery. It is connected to the signal host battery, signal host buttons, signal host LCD screen, and signal generator. The signal host LCD screen is used to display the display content sent by the signal host controller. The display content includes human-computer interaction process information, human-computer interaction information and detection result information. It is connected to the signal host controller. A signal generator, which generates a pre-coded signal according to the signal generation command, is connected to a signal host controller; A detection host, used to judge the detection result information based on the detection signal, includes a detection host battery, detection host buttons, a detection host controller, a detection host LCD screen, a signal acquisition unit, and a signal processor, wherein: The main unit battery provides power and is connected to the main unit buttons, main unit controller, main unit LCD screen, signal acquisition unit, and signal processor. The test host button is used for human-machine interaction by the operator to obtain test interaction information. The test interaction information includes test host power on / off information, selection of current transformer model information, selection of test mode information, viewing of test results information, and confirmation of results information. It is connected to the test host controller and inputs the test interaction information to the test host controller. The detection host controller is the control core of the detection host. It is used to respond to detection interaction information, control the detection display content of the detection host LCD screen, receive digital signal data from the signal processor, generate detection result information based on the digital signal data, and manage the detection host battery. It is connected to the detection host battery, detection host buttons, detection host LCD screen, and signal processor. The detection host LCD screen is used to display the detection display content sent by the detection host controller, wherein the detection display content is the detection result information; A signal acquisition unit is used to acquire signal analysis information, including induced current signals and induced voltage signals. The signal acquisition unit includes a miniature clamp sensor and a signal probe. The miniature clamp sensor is used to non-contactly acquire the induced current signal generated based on the detected current signal in the current secondary circuit. It is connected to a signal processor and sends the induced current signal to the signal acquisition unit. The signal probe is used to contactively acquire the induced voltage signal generated based on the detected voltage signal in the voltage secondary circuit. It directly contacts the voltage terminal. The signal probe is connected to the signal processor and sends the induced voltage signal to the signal acquisition unit. A signal processor is used to preprocess signal analysis information to obtain digital signal data, and it is connected to the detection host controller.

9. The apparatus for determining the wiring of a multi-circuit metering circuit according to claim 8, characterized in that, When the number of metering loops is greater than 1, each metering loop is regarded as a loop to be tested. The number of signal hosts ne is limited according to the number of loops to be tested nu, and ne=nu is set. The detection signal sent by each signal host is set with a detection signal mark code according to the loop to be tested mark, and the detection signal mark code is set as the loop to be tested mark.

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