Dual-mode cable intelligent nuclear phase device and nuclear phase method

Abstract

The invention provides a dual-mode cable intelligent nuclear phase device and a nuclear phase method, and relates to the technical field of power grids. According to the invention, by arranging the test loop unit and the test terminal, a head-tail end collaborative test system is constructed, and tedious preparation and wiring links depending on the combination of multiple devices such as an insulation resistance meter and a discharge rod in a traditional method are replaced. The mode switching unit selects an optimal working mode according to field conditions; the phase sequence switching control unit realizes rapid and accurate switching of the test phase sequence, and does not need to manually and repeatedly disconnect and connect the cable. The signal acquisition unit automatically completes acquisition of test signals; the intelligent judgment unit can process the collected signals in real time and automatically output the judged actual phase sequence, the traditional process depending on repeated communication and manual comparison and analysis of personnel at two ends is compressed to be completed instantly, the one-key-triggered and rapidly-completed automatic phase checking process is achieved, the phase checking operation time is shortened, and the working efficiency is improved. The problem that a traditional nuclear phase mode is low in efficiency is solved, and the cable nuclear phase efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of power grid technology, and in particular to a dual-mode cable intelligent phase comparison device and method. Background Technology

[0002] In the construction, renovation, and operation and maintenance of power systems, cable phase verification is a crucial and fundamental task. Its purpose is to confirm whether the phase (A, B, C phases) correspondence between the beginning and end of the cable line is correct. This is a key step in ensuring the safe commissioning of newly built or renovated lines and preventing equipment damage or system failures caused by incorrect phase sequence.

[0003] Currently, the commonly used cable phase comparison methods in the industry mainly rely on traditional tools such as insulation resistance meters (megohmmeters), discharge rods, and voltage detectors, supplemented by frequent communication and coordination between operators at both ends. Traditional methods require multiple independent steps, including ground insulation testing, voltage boosting, discharge, voltage detection, and phase comparison. A single phase comparison operation typically takes 30 to 45 minutes, which is inefficient and cannot meet the urgent efficiency requirements of modern power grid construction and intelligent operation and maintenance. Summary of the Invention

[0004] This invention provides a dual-mode cable intelligent phase matching device and method, which solves the problem of low efficiency in traditional phase matching methods and improves the efficiency of cable phase matching.

[0005] In a first aspect, the present invention provides a dual-mode cable intelligent phase comparison device, comprising: a test terminal and a test loop unit; the test loop unit is connected to the beginning of the cable under test; the test terminal is connected to the end of the cable under test and receives and processes test signals; the test terminal includes a mode switching unit, a phase sequence switching control unit, a signal acquisition unit, and an intelligent judgment unit; the mode switching unit controls the intelligent phase comparison device to operate in intelligent phase comparison mode or offline operating mode; the phase sequence switching control unit switches the test phase sequence of the cable under test during the test process; the signal acquisition unit acquires test signals of the cable under test under different test phase sequences during the test process; and the intelligent judgment unit determines the actual phase sequence of the cable under test based on the test signals of the cable under test under different test phase sequences.

[0006] In one possible implementation, the test terminal also includes a visualization output unit; the visualization output unit displays the test signals of the cable under test under different test phase sequences, as well as the actual phase sequence of the cable under test.

[0007] In one possible implementation, the test circuit unit includes a first test circuit; the first test circuit includes a first diode, a second diode, and a third diode; the anode of the first diode is connected to a first terminal of the first test circuit, and the cathode of the first diode is connected to a second terminal of the first test circuit; the anode of the second diode is connected to a second terminal of the first test circuit, and the cathode of the second diode is connected to a third terminal of the first test circuit; the anode of the third diode is connected to a first terminal of the first test circuit, and the cathode of the third diode is connected to a third terminal of the first test circuit; the first, second, and third terminals of the first test circuit are respectively connected to the three phases of the cable under test.

[0008] In one possible implementation, the test circuit unit further includes a second test circuit; the second test circuit includes a first capacitor, a second capacitor, and a third capacitor, as well as a first resistor and a second resistor; the first terminal of the first capacitor is connected to the first terminal of the second test circuit and the first terminal of the first resistor, respectively, and the second terminal of the first capacitor is connected to the second terminal of the second test circuit; the first terminal of the second capacitor is connected to the second terminal of the first resistor, and the second terminal of the second capacitor is connected to the second terminal of the second resistor; the first terminal of the third capacitor is connected to the second terminal of the second test circuit, and the second terminal of the third capacitor is connected to the third terminal of the second test circuit and the first terminal of the second resistor, respectively; the second terminal of the first resistor and the second terminal of the second resistor are connected in parallel to the second terminal of the second test circuit; the first, second, and third terminals of the second test circuit are respectively connected to the three phases of the cable under test.

[0009] In one possible implementation, the signal acquisition unit includes an optocoupler-isolated digital signal acquisition circuit for acquiring test signals of the first test circuit in intelligent phase-matching mode to improve anti-interference capability.

[0010] In one possible implementation, the phase sequence switching control unit includes an integrated handle and rotary switch for manual operation to quickly switch the connection relationship between the test loop unit and the three-phase conductors of the cable under test, thereby forming different test phase sequences.

[0011] Secondly, the present invention provides a dual-mode cable intelligent phase comparison method, applied to the intelligent phase comparison device of the first aspect. The method includes: determining the operating mode of the intelligent phase comparison device in response to a user's rotation operation of a rotary switch in a mode switching unit; if the intelligent phase comparison device is in intelligent phase comparison mode, activating a first test circuit, forming at least two different test phase sequences through a phase sequence switching control unit, each test phase sequence corresponding to a connection relationship between each end of the first test circuit and the three-phase cores at the beginning of the cable under test; under each test phase sequence, performing multiple continuity tests by changing the connection relationship between the test power supply and each core at the end of the cable under test, and having a signal acquisition unit collect the current continuity state of each core in each test to generate multiple current continuity state combinations under each test phase sequence; and an intelligent judgment unit determining the actual phase sequence of the cable under test based on the multiple current continuity state combinations under each test phase sequence, the actual phase sequence including the correspondence between the cores at the beginning and end.

[0012] In one possible implementation, the actual phase sequence of the cable under test is determined based on multiple current on / off state combinations under each test phase sequence. This includes: for each of at least two different test phase sequences, identifying a current on / off state combination in which only one conductor at the tail end has no current while the other two conductors have current during multiple on / off tests, as the target combination; under the first test phase sequence, when the target combination occurs, determining that the conductor at the tail end with no current belongs to the same phase as the conductor at the head end connected to the first end of the first test circuit; under the second test phase sequence, when the target combination occurs, determining that the conductor at the tail end with no current belongs to the same phase as the conductor at the head end connected to the first end of the first test circuit; determining that the remaining conductor at the tail end and the remaining conductor at the head end belong to the same phase, thus completing the determination of the phase sequence correspondence between the three-phase conductors at the head and tail ends.

[0013] In one possible implementation, the method further includes: if the intelligent phase comparison device is in offline phase comparison mode, then the second test circuit is activated, and at least three different test phase sequences are formed through the phase sequence switching control unit. Each test phase sequence corresponds to a connection relationship between each end of the first test circuit and the three-phase cores at the beginning of the cable under test. Under each test phase sequence, the interphase impedance between each core of the cable under test is measured by the signal acquisition unit to obtain the combination of interphase impedance values ​​under each test phase sequence. The combination of interphase impedance values ​​includes the interphase impedance values ​​between any two phases. The intelligent judgment unit, based on the combination of interphase impedance values ​​under each test phase sequence, queries a preset impedance ratio relationship and a comparison table of the phase sequence of the tail cores to determine the actual phase sequence correspondence between the beginning and end cores of the cable under test.

[0014] In one possible implementation, based on the combination of phase-to-phase impedance values ​​under each test phase sequence, a preset impedance ratio and phase sequence lookup table is consulted to determine the actual phase sequence correspondence between the start and end conductors of the cable under test. This includes: determining the ratio between the three phase-to-phase impedance values ​​under each test phase sequence based on the combination of phase-to-phase impedance values ​​under each test phase sequence; matching the ratio between the three phase-to-phase impedance values ​​under each test phase sequence with multiple standard ratios in the lookup table to determine the end conductor phase sequence under each test phase sequence, wherein each end conductor phase sequence corresponds to a connection relationship between each interface of the test terminal and the three phase conductors at the end of the cable under test; and determining the actual phase sequence correspondence between the start and end conductors of the cable under test based on the end conductor phase sequences under multiple test phase sequences.

[0015] This invention provides a dual-mode intelligent phase comparison device and method for cables. By setting up a test circuit unit and a test terminal, this invention constructs a collaborative testing system at both ends, replacing the cumbersome preparation and wiring steps of traditional methods that rely on multiple devices such as insulation resistance meters and discharge rods. The mode switching unit selects the optimal working mode based on the site conditions; the phase sequence switching control unit enables rapid and accurate switching of the test phase sequence, eliminating the need for repeated manual cable disconnection and reconnection; the signal acquisition unit automatically acquires test signals; and the intelligent judgment unit instantly processes the acquired signals and automatically outputs the determined actual phase sequence. This compresses the traditional process of repeated communication and manual comparison and analysis between personnel at both ends into an instantaneous process, achieving a one-click, rapid, automated phase comparison process. This reduces phase comparison operation time, solves the problem of low efficiency in traditional phase comparison methods, and improves the efficiency of cable phase comparison. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a dual-mode cable intelligent phase comparison device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating an application scenario of an intelligent phase resection device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a first test circuit provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a second test circuit provided in an embodiment of the present invention; Figure 5This is a flowchart illustrating a dual-mode cable intelligent phase matching method provided in an embodiment of the present invention. Detailed Implementation

[0018] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0019] In the description of this invention, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" and "more than one" refer to two or more. The terms "first," "second," etc., do not limit the quantity or order of execution, and "first," "second," etc., do not necessarily imply differences.

[0020] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0021] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the steps or modules listed, but may optionally include other steps or modules not listed, or may optionally include other steps or modules inherent to such process, method, product, or device.

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0023] As the background technology states, with the rapid development of power grid construction, cable phase verification has become increasingly important in the construction, renovation, and expansion of cable lines. Traditional cable phase verification methods have the following problems: 1. Long processing time: A single phase verification takes between 30 and 45 minutes, which cannot meet the needs of modern intelligent power grid operation and maintenance. 2. Complex operation: Traditional methods require the use of insulation resistance meters, discharge rods, insulating gloves, and other devices, making the operation cumbersome and posing safety hazards. 3. Difficult communication: Frequent communication between personnel at both ends is required during the phase verification process, especially in special environments such as cable tunnels, resulting in low communication efficiency. 4. Poor anti-interference capability: In strong magnetic fields or complex environments, the accuracy of phase verification using traditional methods is significantly affected.

[0024] To address the aforementioned technical problems, this invention provides a dual-mode intelligent phase comparison device and method for cables. The device includes a test terminal, a test circuit unit, a mode switching unit, a phase sequence switching control unit, a signal acquisition unit, an intelligent judgment unit, and a visualization output unit. The intelligent phase comparison device supports two operating modes: Mode 1 is an intelligent phase comparison mode, which loads different impedances through an anti-interference module and uses a microprocessor to determine the cable phase sequence; Mode 2 is an offline anti-interference cable automatic phase comparison mode, which uses cable cores to build a test circuit, distinguishes phase sequence through diode combinations and impedance combinations, and combines optocoupler-isolated signal acquisition and intelligent judgment technology to achieve rapid phase comparison. The two modes are selectable via a switch, suitable for cable phase comparison needs in different scenarios, significantly improving phase comparison efficiency, safety, and accuracy.

[0025] like Figure 1 As shown, this embodiment of the invention provides a dual-mode cable intelligent phase comparison device. The intelligent phase comparison device includes: a test terminal and a test loop unit. The test loop unit is connected to the beginning of the cable under test, and the test terminal is connected to the end of the cable under test, receiving and processing test signals.

[0026] In this embodiment of the application, the test terminal includes a mode switching unit, a phase sequence switching control unit, a signal acquisition unit, and an intelligent judgment unit.

[0027] The mode switching unit controls the intelligent phase comparison device to work in intelligent phase comparison mode or offline working mode; the phase sequence switching control unit switches the test phase sequence of the cable under test during the test process; the signal acquisition unit acquires the test signals of the cable under test under different test phase sequences during the test process; and the intelligent judgment unit determines the actual phase sequence of the cable under test based on the test signals of the cable under test under different test phase sequences.

[0028] In some embodiments, the mode switching control unit switches between two modes via a rotary switch. The phase sequence switching control unit uses an integrated handle for rapid switching of the three-phase cable via a rotary switch. The signal acquisition unit supports signal acquisition for two modes, corresponding to the anti-interference module and the optocoupler-isolated digital signal acquisition circuit, respectively. The intelligent judgment unit uses a high-performance microcontroller (such as PLC18F4520) and supports intelligent judgment algorithms for both modes.

[0029] In some embodiments, the test terminal further includes a visualization output unit; the visualization output unit displays the test signals of the cable under test under different test phase sequences, as well as the actual phase sequence of the cable under test. The visualization output unit uses a 4.3-inch TFT touch screen to display the phase comparison results in real time.

[0030] like Figure 2 As shown, this embodiment of the invention provides an application scenario diagram of an intelligent phase comparison device. The invention places the test circuit unit at the beginning of the cable, and electrically connects the three-phase terminals of the test circuit unit to the three cable wires respectively; the test terminal is placed at the end of the cable, and the output terminal of the output circuit control module and the input terminal of the data acquisition module are electrically connected to the three cable wires.

[0031] For example, the embodiments of the present invention can be applied to phase matching work for newly built, renovated (expanded) cable lines, significantly improving phase matching efficiency. Alternatively, they can also be applied to phase matching work in complex environments such as cable tunnels, exhibiting high anti-interference capabilities.

[0032] For example, phase matching for newly built, renovated, or expanded cable lines: Before cable commissioning, ensure the correct phase sequence to avoid equipment damage or power system failures caused by incorrect phase sequence. Phase matching in substation cable rooms: Applicable to phase matching in cable rooms within substations, especially in environments with limited space and poor communication, significantly improving phase matching efficiency. Phase matching for cables with voltage levels of 35kV and below: Applicable to phase matching of three-phase cables with voltage levels of 35kV and below, meeting the phase matching requirements of different voltage levels.

[0033] In some embodiments, the test circuit unit includes a diode combination section in Mode 1, which uses cable cores to build a test circuit and uses the diode combination to distinguish the phase sequence of the three-phase cable; and an impedance combination section in Mode 2, which uses inter-phase circuits to build different impedances and distinguish the cable phase sequence.

[0034] In some embodiments, the intelligent phase retrieval device has two operating modes: intelligent phase retrieval mode and offline operating mode.

[0035] Mode 1: Intelligent Phase Comparison Mode. This mode utilizes a cable core test circuit built at one end of the cable, employing diode combinations to differentiate phase sequences. Combined with optocoupler-isolated signal acquisition and intelligent judgment technology, it enables rapid phase comparison. Suitable for phase comparison in newly built, renovated, or expanded cable lines, it significantly shortens the comparison time.

[0036] Mode 2: Offline anti-interference cable automatic phase sequence matching mode, also known as offline working mode. Different impedances are applied to one end of the cable via the test circuit unit, and the test terminal collects the phase-to-phase impedance at the other end. The microprocessor determines the cable phase sequence based on the impedance values. This mode is suitable for phase matching of cables in strong magnetic fields or complex environments and has high anti-interference capability.

[0037] like Figure 3 As shown, this embodiment of the invention provides a schematic diagram of a first test circuit. The test circuit unit includes a first test circuit; the first test circuit includes a first diode, a second diode, and a third diode. The anode of the first diode is connected to a first terminal of the first test circuit, and the cathode of the first diode is connected to a second terminal of the first test circuit; the anode of the second diode is connected to a second terminal of the first test circuit, and the cathode of the second diode is connected to a third terminal of the first test circuit; the anode of the third diode is connected to a first terminal of the first test circuit, and the cathode of the third diode is connected to a third terminal of the first test circuit; the first, second, and third terminals of the first test circuit are respectively connected to the three phases of the cable under test.

[0038] based on Figure 3 The principle of Mode 1 is as follows: Utilizing the forward conductivity of diodes, a combined continuity test circuit based on the principle of permutation and combination is designed based on the phase-to-phase conduction of three-phase cables. The innovative principle of this circuit is as follows: Any one of the three interfaces of the diode circuit is connected to the positive terminal of the power supply through a certain cable core, and the other two interfaces are connected to the negative terminal through the other two cores respectively. When interface 1 is connected to the positive terminal, current flows through all three cables; when the positive terminal is connected to interface 2, current flows through only two cable cores; and when the positive terminal is connected to interface 3, no current flows through any of the three cables. The different numbers of cable cores with current flowing through the circuit distinguish the cable cores connected to different interfaces, thus achieving the purpose of distinguishing phases. The schematic diagram of the combined continuity test circuit verification principle of Mode 1 is shown in Table 1.

[0039] Table 1

[0040] like Figure 4As shown in the diagram, this embodiment of the invention provides a structural schematic of a second test circuit. The test circuit unit further includes a second test circuit; the second test circuit includes a first capacitor, a second capacitor, and a third capacitor, as well as a first resistor and a second resistor; the first terminal of the first capacitor is connected to the first terminal of the second test circuit and the first terminal of the first resistor, respectively, and the second terminal of the first capacitor is connected to the second terminal of the second test circuit; the first terminal of the second capacitor is connected to the second terminal of the first resistor, and the second terminal of the second capacitor is connected to the second terminal of the second resistor; the first terminal of the third capacitor is connected to the second terminal of the second test circuit, and the second terminal of the third capacitor is connected to the third terminal of the second test circuit and the first terminal of the second resistor, respectively; the second terminal of the first resistor and the second terminal of the second resistor are connected in parallel and then connected to the second terminal of the second test circuit; the first terminal, the second terminal, and the third terminal of the second test circuit are respectively connected to the three phases of the cable under test.

[0041] based on Figure 4 The processor calculates the digital signals of phases AB, BC, and CA at the input three-phase output terminals, and calculates the inter-phase resistance R of phases AB, BC, and CA respectively. AB R BC and R CA According to R AB R BC and R CA Determine the phase sequence of the cable and output it to the display screen. Refer to Table 2 below for phase sequence determination: Table 2

[0042] In some embodiments, the signal acquisition unit includes an optocoupler-isolated digital signal acquisition circuit for acquiring test signals of the first test circuit in intelligent phase-matching mode to improve anti-interference capability.

[0043] In some embodiments, the phase sequence switching control unit includes an integrated handle and rotary switch for manual operation to quickly switch the connection relationship between the test circuit unit and the three-phase conductors of the cable under test, thereby forming different test phase sequences.

[0044] This invention provides a dual-mode intelligent phase comparison device for cables. By setting up a test circuit unit and a test terminal, it constructs a test system that coordinates the beginning and end of the cable, replacing the cumbersome preparation and wiring steps of traditional methods that rely on multiple devices such as insulation resistance meters and discharge rods. The mode switching unit selects the optimal working mode according to the site conditions; the phase sequence switching control unit realizes rapid and accurate switching of the test phase sequence without the need for repeated manual cable disconnection and reconnection; the signal acquisition unit automatically completes the acquisition of test signals; and the intelligent judgment unit can instantly process the acquired signals and automatically output the determined actual phase sequence. This compresses the traditional process of repeated communication and manual comparison and analysis between personnel at both ends into an instantaneous process, realizing an automated phase comparison process that can be triggered with one click and completed quickly. This reduces the phase comparison operation time, solves the problem of low efficiency in traditional phase comparison methods, and improves the efficiency of cable phase comparison.

[0045] like Figure 5 As shown, this embodiment of the invention provides a smart phase matching method for dual-mode cables, applied to... Figure 1 The intelligent nucleus device shown includes steps S101-S103.

[0046] S101. In response to the user's rotation operation of the rotary switch in the mode switching unit, the operating mode of the intelligent phase detection device is determined.

[0047] S102. If the intelligent phase comparison device is in intelligent phase comparison mode, the first test circuit is activated, and at least two different test phase sequences are formed through the phase sequence switching control unit. Each test phase sequence corresponds to a connection relationship between each end of the first test circuit and the three-phase cores at the beginning of the cable under test. Under each test phase sequence, multiple continuity tests are performed by changing the connection relationship between the test power supply and each core at the end of the cable under test. The signal acquisition unit collects the current continuity status of each core in each test and generates multiple current continuity status combinations under each test phase sequence. The intelligent judgment unit determines the actual phase sequence of the cable under test based on the multiple current continuity status combinations under each test phase sequence. The actual phase sequence includes the correspondence between the cores at the beginning and end of the cable.

[0048] As one possible implementation, embodiments of the present invention can determine the actual phase sequence of the cable under test through steps A1-A4.

[0049] A1. For each of at least two different test phase sequences, identify the current on / off state combination in multiple on / off tests where only one conductor at the tail end has no current and the other two conductors have current, and use this combination as the target combination.

[0050] A2. In the first test phase sequence, when the target combination appears, the wire core with no current at the tail end is determined to belong to the same phase as the wire core whose head end is connected to the first end of the first test circuit.

[0051] A3. In the second test phase sequence, when the target combination appears, the wire core with no current at the tail end is determined to belong to the same phase as the wire core whose head end is connected to the first end of the first test circuit.

[0052] A4. Determine that the remaining conductor at the tail end and the remaining conductor at the head end are of the same phase, thus completing the determination of the phase sequence correspondence between the three-phase conductors at the head and tail ends.

[0053] For example, the implementation steps of Mode 1 are as follows: 1) Preparation: Place the device at both ends of the cable, ensure that the device has sufficient power and the display screen is working properly.

[0054] 2) Wiring: Connect the three-phase wires at both ends of the cable to the test circuit unit in the device mode, ensuring that the wiring is secure.

[0055] 3) Start the device: Press the "Power On" button on the device and switch the device to mode one to start self-test and enter standby mode.

[0056] 4) Phase verification operation: Press the "Test" button and the device will automatically perform phase verification operation. The integrated handle control unit switches the three-phase cable, collects signals and feeds them back to the test terminal.

[0057] 5) Result reading: After the phase comparison is completed, the microcontroller realizes the intelligent judgment of the phase sequence, and the device displays the phase comparison result through the touch screen. The operator can directly read the phase sequence information.

[0058] 6) Reset: After the phase comparison is completed, press the "Reset" button to restore the device to its initial state.

[0059] S103. If the intelligent phase comparison device is in offline phase comparison mode, the second test circuit is activated, and at least three different test phase sequences are formed through the phase sequence switching control unit. Each test phase sequence corresponds to a connection relationship between each end of the first test circuit and the three-phase cores at the beginning of the cable under test. Under each test phase sequence, the interphase impedance between each core of the cable under test is measured by the signal acquisition unit to obtain the combination of interphase impedance values ​​under each test phase sequence. The combination of interphase impedance values ​​includes the interphase impedance values ​​between any two phases. The intelligent judgment unit queries the preset impedance ratio relationship and the tail core phase sequence comparison table according to the combination of interphase impedance values ​​under each test phase sequence to determine the actual phase sequence correspondence between the beginning and end cores of the cable under test.

[0060] As one possible implementation, embodiments of the present invention can determine the actual phase sequence of the cable under test through steps B1-B3.

[0061] B1. Based on the combination of phase-to-phase impedance values ​​under each test phase sequence, determine the proportional relationship between the three phase-to-phase impedance values ​​under each test phase sequence.

[0062] B2. Match the proportional relationship between the three phase impedance values ​​under each test phase sequence with the multiple standard proportional relationships in the reference table to determine the tail core phase sequence under each test phase sequence.

[0063] Each tail wire phase sequence corresponds to a connection relationship between each interface of the test terminal and the three-phase wires at the tail end of the cable under test.

[0064] B3. Based on the phase sequence of the tail conductor under various test phase sequences, determine the actual phase sequence correspondence between the head and tail conductors of the cable under test.

[0065] Example implementation steps for Mode 2: 1) Preparation: Place the device at both ends of the cable, ensure that the device has sufficient power and the display screen is working properly.

[0066] 2) Wiring: Connect the three-phase wires at both ends of the cable to the test circuit unit under mode two of the device, and ensure that the wiring is secure.

[0067] 3) Start the device: Press the "Power On" button on the device and switch the device to mode two to start self-test and enter standby mode.

[0068] 4) Phase verification operation: Press the "Test" button and the device will automatically perform phase verification operation. The integrated handle control unit will switch the three-phase cable, collect signals and feed them back to the test terminal.

[0069] 5) Result reading: After the phase comparison is completed, the microcontroller realizes the intelligent judgment of the phase sequence, and the device displays the phase comparison result through the touch screen. The operator can directly read the phase sequence information.

[0070] 6) Reset: After the phase comparison is completed, press the "Reset" button to restore the device to its initial state.

[0071] In some embodiments, mode switching is performed by selecting the operating mode via a rotary switch, and the LED indicator on the device panel displays the current mode. The mode switching time is ≤5 seconds, and the switching accuracy is 100%.

[0072] For example, through practical application testing, the embodiments of the present invention have shown that the nuclear phase wizard has significantly improved in terms of nuclear phase time, accuracy and safety. Specific quantitative indicators are shown in Table 3.

[0073] Table 3

[0074] The dual-mode cable intelligent phase comparison device and phase comparison method provided by the present invention have the following technical effects.

[0075] 1. Safety and economic benefits 1) Safety Benefits and Reduced Operational Risks: Traditional cable phase matching methods require high-voltage boosting, discharging, and voltage testing, posing significant safety risks. The "Phase Matching Wizard" utilizes a low-voltage testing circuit, with voltages below human safety limits, significantly reducing operational risks. 2) Reduced Human Error: Traditional methods rely on manual phase sequence judgment, which carries the risk of misjudgment. The new device reduces human error and improves accuracy through intelligent judgment and visual output. 3) Simplified Operation: The new device enables one-click rapid phase matching, reducing complex manual steps and minimizing safety hazards caused by improper operation.

[0076] 2) Economic benefits and time savings: Traditional phase comparison methods take between 30-45 minutes per test, while the new device reduces this time to less than 10 minutes, significantly improving work efficiency and saving substantial time costs. Reduced labor costs: Traditional methods require frequent communication between personnel at both ends, making operation complex and time-consuming. The new device, through automatic signal acquisition and intelligent judgment, reduces manpower input and lowers labor costs. Reduced equipment wear and tear: Traditional methods require multiple high-voltage boosting operations, easily leading to equipment wear and tear. The new device uses a low-voltage testing circuit, reducing equipment wear and tear and extending equipment lifespan.

[0077] 2. Scope of Promotion In the power system field, phase matching for newly built, renovated, or expanded cable lines: Before cable commissioning, ensure the correct phase sequence to avoid equipment damage or power system failures caused by incorrect phase sequence. Substation cable phase matching: Applicable to phase matching in cable rooms within substations, especially in environments with limited space and poor communication, significantly improving phase matching efficiency. 35kV and below voltage level cable phase matching: Applicable to phase matching of three-phase cables at voltage levels of 35kV and below, meeting the phase matching requirements of different voltage levels.

[0078] In the industrial sector, cable phase matching for large industrial enterprises: suitable for cable phase matching within large industrial enterprises to ensure the stable operation of the power system. Cable phase matching in special environments such as mines and petrochemical plants: suitable for cable phase matching in special environments such as mines and petrochemical plants to improve the safety and efficiency of phase matching.

[0079] In the fields of scientific research and education, power system research and teaching: applicable to power system research and teaching, serving as a typical case of intelligent phase return technology, promoting technological progress and talent cultivation in related fields.

[0080] In summary, this invention, through innovative technical means, significantly improves the efficiency, safety, and accuracy of cable phase matching, possessing high promotional value and application prospects. It has broad application prospects in power systems, industrial fields, and scientific research and education, effectively enhancing the efficiency, safety, and economic benefits of phase matching work, and promoting technological progress and development in related fields.

[0081] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A dual-mode cable intelligent phase comparison device, characterized in that, include: The test terminal and the test loop unit are connected to the beginning of the cable under test and the test terminal is connected to the end of the cable under test to receive and process test signals. The test terminal includes a mode switching unit, a phase sequence switching control unit, a signal acquisition unit, and an intelligent judgment unit; The mode switching unit controls the intelligent phase retrieval device to operate in intelligent phase retrieval mode or offline working mode; The phase sequence switching control unit switches the test phase sequence of the cable under test during the test process; The signal acquisition unit acquires test signals of the cable under test under different test phase sequences during the test process; The intelligent judgment unit determines the actual phase sequence of the cable under test based on the test signals of the cable under test under different test phase sequences.

2. The dual-mode cable intelligent phase comparison device according to claim 1, characterized in that, The test terminal also includes a visualization output unit; the visualization output unit displays the test signals of the cable under test under different test phase sequences, as well as the actual phase sequence of the cable under test.

3. The dual-mode cable intelligent phase comparison device according to claim 1, characterized in that, The test circuit unit includes a first test circuit; the first test circuit includes a first diode, a second diode, and a third diode; The anode of the first diode is connected to the first terminal of the first test circuit, and the cathode of the first diode is connected to the second terminal of the first test circuit; the anode of the second diode is connected to the second terminal of the first test circuit, and the cathode of the second diode is connected to the third terminal of the first test circuit; the anode of the third diode is connected to the first terminal of the first test circuit, and the cathode of the third diode is connected to the third terminal of the first test circuit. The first, second, and third ends of the first test circuit are respectively connected to the three phases of the cable under test.

4. The dual-mode cable intelligent phase comparison device according to claim 1, characterized in that, The test circuit unit further includes a second test circuit; the second test circuit includes a first capacitor, a second capacitor, and a third capacitor, as well as a first resistor and a second resistor; The first terminal of the first capacitor is connected to the first terminal of the second test circuit and the first terminal of the first resistor, respectively; the second terminal of the first capacitor is connected to the second terminal of the second test circuit. The first terminal of the second capacitor is connected to the second terminal of the first resistor, and the second terminal of the second capacitor is connected to the second terminal of the second resistor; The first terminal of the third capacitor is connected to the second terminal of the second test circuit, and the second terminal of the third capacitor is connected to the third terminal of the second test circuit and the first terminal of the second resistor, respectively. The second end of the first resistor and the second end of the second resistor are connected in parallel and then connected to the second end of the second test circuit. The first, second, and third ends of the second test circuit are respectively connected to the three phases of the cable under test.

5. The dual-mode cable intelligent phase comparison device according to claim 1, characterized in that, The signal acquisition unit includes an optocoupler-isolated digital signal acquisition circuit, which is used to acquire the test signal of the first test circuit in intelligent phase comparison mode to improve anti-interference capability.

6. The dual-mode cable intelligent phase comparison device according to claim 1, characterized in that, The phase sequence switching control unit includes an integrated handle and a rotary switch for manual operation to quickly switch the connection relationship between the test circuit unit and the three-phase conductors of the cable under test, thereby forming different test phase sequences.

7. A smart phase matching method for dual-mode cables, characterized in that, The method, applied to the intelligent nucleation device according to any one of claims 1 to 6, comprises: The operating mode of the intelligent phase detection device is determined in response to the user's rotation of the rotary switch in the mode switching unit. If the intelligent phase comparison device is in intelligent phase comparison mode, the first test circuit is activated, and at least two different test phase sequences are formed through the phase sequence switching control unit. Each test phase sequence corresponds to a connection relationship between each end of the first test circuit and the three-phase cores at the beginning of the cable under test. Under each test phase sequence, multiple continuity tests are performed by changing the connection relationship between the test power supply and the cores at the end of the cable under test. The signal acquisition unit collects the current continuity status of each core in each test and generates multiple current continuity status combinations under each test phase sequence. The intelligent judgment unit determines the actual phase sequence of the cable under test based on the multiple current continuity status combinations under each test phase sequence. The actual phase sequence includes the correspondence between the cores at the beginning and end of the cable.

8. The intelligent phase matching method for dual-mode cables according to claim 7, characterized in that, The determination of the actual phase sequence of the cable under test based on multiple current on / off state combinations under each test phase sequence includes: For each of the at least two different test phase sequences, identify the current on / off state combination in the multiple on / off tests in which only one wire core at the tail end has no current and the other two wire cores have current, and use it as the target combination. In the first test phase sequence, when the target combination appears, the wire core with no current at the tail end is determined to belong to the same phase as the wire core whose head end is connected to the first end of the first test circuit; In the second test phase sequence, when the target combination appears, the wire core with no current at the tail end is determined to belong to the same phase as the wire core whose head end is connected to the first end of the first test circuit. The remaining conductor at the tail end is identified as being in the same phase as the remaining conductor at the head end, thus completing the determination of the phase sequence correspondence between the three-phase conductors at the head and tail ends.

9. The intelligent phase matching method for dual-mode cables according to claim 7, characterized in that, The method further includes: If the intelligent phase comparison device is in offline phase comparison mode, the second test circuit is activated, and at least three different test phase sequences are formed through the phase sequence switching control unit. Each test phase sequence corresponds to a connection relationship between each end of the first test circuit and the three-phase core of the cable under test. Under each test phase sequence, the interphase impedance between each core of the cable under test is measured by the signal acquisition unit to obtain the interphase impedance value combination under each test phase sequence. The interphase impedance value combination includes the interphase impedance value between any two phases. The intelligent judgment unit determines the actual phase sequence correspondence between the first and last conductors of the cable under test by querying a preset impedance ratio relationship and a comparison table of the phase sequence of the tail conductors based on the phase impedance value combination under each test phase sequence.

10. The intelligent phase comparison method for dual-mode cables according to claim 9, characterized in that, The step of determining the actual phase sequence correspondence between the first and last conductors of the cable under test by consulting a preset impedance ratio and phase sequence lookup table based on the phase impedance value combination under each test phase sequence includes: Based on the combination of interphase impedance values ​​under each test phase sequence, determine the proportional relationship between the three interphase impedance values ​​under each test phase sequence; The proportional relationship between the three phase impedance values ​​under each test phase sequence is matched with multiple standard proportional relationships in the reference table to determine the tail core phase sequence under each test phase sequence. Each tail core phase sequence corresponds to a connection relationship between each interface of the test terminal and the three phase cores at the tail end of the cable under test. Based on the phase sequence of the tail conductor under various test phase sequences, the actual phase sequence correspondence between the head and tail conductors of the cable under test is determined.

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