A cable cross-bonding system live core phase method and system

Abstract

The application discloses a kind of cable cross interconnection system live core phase method and system, comprising: establishing the first phase sequence detection framework based on the cable to be measured;First check waveform and second check waveform based on the first phase sequence detection framework are obtained;First detection waveform and second detection waveform based on the first phase sequence detection framework are obtained;According to first check waveform, second check waveform, first detection waveform and second detection waveform, the live core phase judgment of cable cross interconnection system is carried out.Can verify the correct phase sequence relationship outside cross interconnection box, and further identify the accuracy of cross interconnection connection inside cross interconnection box, improve the work efficiency of power operation personnel and power supply reliability, save manpower and material resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phase sequence detection of cable cross-connection systems, and in particular to a method and system for live phase detection of cable cross-connection systems. BACKGROUND

[0002] In power systems, cable cross-connection systems are an important part of ensuring the stability and safety of power transmission. With the continuous expansion of the power grid and the sustained growth of power demand, higher requirements are placed on the maintenance and management of power cables, especially high-voltage cables. The correct phase sequence of the cable is crucial for the normal operation of the system, and an incorrect phase sequence not only causes the power system to malfunction, but also can cause serious safety accidents. Therefore, effective phase sequence detection of cable cross-connection systems has become an important part of power operation and maintenance work.

[0003] Traditional methods of cable phase sequence detection rely on power-off detection, which is not only time-consuming and labor-intensive, but also may affect the overall operation of the power grid in some critical locations. In addition, traditional methods often require opening the cable cross-connection box to check the internal wiring, which not only increases the workload, but also poses a certain safety risk. Especially under high current conditions, due to the presence of strong magnetic fields, traditional phase sequence detection methods are difficult to accurately measure the phase sequence, which limits their effectiveness and reliability in practical applications. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above existing problems, the present application is proposed.

[0006] Therefore, the present application provides a method and system for live phase detection of cable cross-connection systems, which can solve the problems mentioned in the background art.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] In a first aspect, the present application provides a method for live phase detection of a cable cross-connection system, comprising:

[0009] establishing a first phase sequence detection framework based on the cable to be tested;

[0010] obtaining a first comparison waveform and a second comparison waveform based on the first phase sequence detection framework;

[0011] obtaining a first detection waveform and a second detection waveform based on the first phase sequence detection framework;

[0012] performing a live phase judgment of the cable cross-connection system according to the first check waveform, the second check waveform, the first detection waveform and the second detection waveform.

[0013] As a preferred scheme of the method for performing a live phase judgment of a cable cross-connection system, the method comprises the following steps:

[0014] The first phase sequence detection framework comprises a plurality of cross-connection groups, and each cross-connection group comprises a first cross-connection box and a second cross-connection box.

[0015] The first check waveform is a correct phase sequence waveform of the first cross-connection box.

[0016] The second check waveform is a correct phase sequence waveform of the second cross-connection box.

[0017] As a preferred scheme of the method for performing a live phase judgment of a cable cross-connection system, the method comprises the following steps:

[0018] The first live phase judgment is performed on the first detection waveform based on the first check waveform.

[0019] The second live phase judgment is performed on the first detection waveform based on the second check waveform.

[0020] The live phase judgment of the cross-connection group is performed according to the results of the first live phase judgment and the second live phase judgment.

[0021] As a preferred scheme of the method for performing a live phase judgment of a cable cross-connection system, the method comprises the following steps:

[0022] The live phase judgment is performed on all cross-connection groups in the first phase sequence detection framework.

[0023] The live phase judgment of the cable cross-connection system is completed according to the results of the live phase judgment.

[0024] As a preferred scheme of the method for performing a live phase judgment of a cable cross-connection system, the method comprises the following steps:

[0025] The first phase sequence detection framework also includes several directional pulse-coupled slave devices and several phase sequence measurement unit master devices;

[0026] The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield layer of a certain phase cable in a direct connection box.

[0027] The phase sequence measurement unit host device is used to detect the positive high-frequency pulse signal injected into the cable terminal.

[0028] As a preferred embodiment of the live phase verification method for the cable cross-connection system described in this invention, the directional pulse coupling slave device is used to inject a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield layer of a certain phase cable directly connected to the ground box, including:

[0029] The directional pulse-coupled slave device detects the current in this phase ground wire and injects a positive high-frequency pulse signal in a set direction at the zero-crossing point of the current.

[0030] As a preferred embodiment of the live phase verification method for the cable cross-interconnection system described in this invention, the correct phase sequence waveform includes the correct waveforms of three different phases.

[0031] In a second aspect, the present invention provides a live phase comparison system for a cable cross-connection system, comprising:

[0032] The framework establishment module is used to establish the first phase sequence detection framework based on the cable under test.

[0033] The waveform acquisition module is used to acquire the first and second verification waveforms based on the first phase sequence detection framework.

[0034] The detection waveform acquisition module is used to acquire a first detection waveform and a second detection waveform based on the first phase sequence detection framework.

[0035] The judgment module is used to judge the energized phase of the cable cross-interconnection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

[0036] Thirdly, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0037] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0038] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention proposes a live phase sequence verification method and system for cable cross-connection systems, establishing a first phase sequence detection framework based on the cable under test; acquiring a first verification waveform and a second verification waveform based on the first phase sequence detection framework; acquiring a first detection waveform and a second detection waveform based on the first phase sequence detection framework; and performing live phase sequence verification of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform. This method can verify the correct external phase sequence relationship of the cross-connection box and further identify the accuracy of the internal cross-connection wiring, improving the work efficiency and power supply reliability of power maintenance personnel and saving manpower and resources. This application can verify whether the phase sequence of the cross-connection box is wired according to regulations under live conditions without opening the box, ensuring the accuracy and reliability of testing under any high current conditions. This solves the current problem that testing can only be performed under low current conditions (less than 30A) and requires opening the cover for inspection. It enables rapid verification of the phase sequence of the cross-connection box and determines the correctness of the internal cross-connection wiring, improving the work efficiency and power supply reliability of power maintenance personnel, saving significant manpower and resources, reducing power outage time, and alleviating the workload of maintenance personnel. The advantages of this application lie in its ability to operate under high current conditions without opening the cover, allowing for accurate verification of the internal cross-connection wiring. It can be operated and measured under various complex operating conditions, with reliable measurement preparation, high speed, and lightweight design for easy portability. It has significant social and economic benefits. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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. Wherein:

[0040] Figure 1 A flowchart illustrating a live phase comparison method and system for a cable cross-connection system, as provided in one embodiment of the present invention;

[0041] Figure 2 This invention provides a method for energized phase comparison of a cable cross-connection system and a measurement simulation wiring diagram for the system.

[0042] Figure 3 A waveform display diagram of a live phase comparison method and system for a cable cross-connection system provided in one embodiment of the present invention;

[0043] Figure 4A structural block diagram of a directional pulse coupling slave device for a cable cross-connection system provided in one embodiment of the present invention;

[0044] Figure 5 A structural block diagram of the phase sequence measurement unit main device of a cable cross-connection system provided in one embodiment of the present invention;

[0045] Figure 6 A method for energized phase comparison in a cable cross-connection system and a master / slave program logic block diagram of the system are provided in one embodiment of the present invention.

[0046] Figure 7 A circuit diagram of a live phase comparison method and signal isolation amplification and filtering steepening circuit for a cable cross-connection system provided in one embodiment of the present invention;

[0047] Figure 8 A circuit diagram of a live phase comparison method and signal triggering circuit for a cable cross-connection system provided in one embodiment of the present invention;

[0048] Figure 9 A circuit diagram of a live phase comparison method and timing combination circuit for a cable cross-connection system provided in one embodiment of the present invention;

[0049] Figure 10 A circuit diagram of a live phase comparison method for a cable cross-connection system and a high-voltage pulse output module of the system, provided as an embodiment of the present invention;

[0050] Figure 11 A circuit schematic diagram of an MCU processing module for a live phase comparison method and system for a cable cross-connection system provided in one embodiment of the present invention;

[0051] Figure 12 A circuit diagram of a 400V boost energy storage circuit for a live phase comparison method and system for a cable cross-connection system provided in one embodiment of the present invention;

[0052] Figure 13 A circuit diagram of a lithium battery and power supply circuit for a live phase comparison method and system for a cable cross-connection system provided in one embodiment of the present invention;

[0053] Figure 14 This is an internal structural diagram of a computer device for a live phase comparison method and system for a cable cross-connection system provided in one embodiment of the present invention. Detailed Implementation

[0054] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0055] Example 1

[0056] Reference Figures 1-14 This is the first embodiment of the present invention, which provides a method and system for live phase comparison of a cable cross-connection system, comprising:

[0057] In existing related technologies, there are some problems. For example, in cable cross-connection systems, due to the complexity of cable lines, wiring errors inside the cross-connection box often occur, which will lead to unstable operation of the power supply system or even failure.

[0058] This application provides a method that can effectively solve the problems mentioned above. The following will describe in detail how to implement the live phase comparison method of the cable cross-interconnection system with multiple embodiments.

[0059] Figure 1 A flowchart illustrating a live phase comparison method and system for a cable cross-connection system is shown, including:

[0060] S101, Establish the first phase sequence detection framework based on the cable under test;

[0061] In an alternative embodiment, the first phase sequence detection framework can be designed using different means, such as using a high-precision sensor array to capture current signals in the cable and using advanced signal processing algorithms to analyze the phase information of the cable, or using machine learning technology to intelligently identify and verify the phase sequence of the cable, or a specific framework designed based on the underlying phase judgment logic.

[0062] In this embodiment, a first phase sequence detection framework is designed based on the underlying phase judgment logic;

[0063] In this embodiment of the application, establishing a first phase sequence detection framework based on the cable under test includes:

[0064] The first phase sequence detection framework includes several cross-interconnection groups, and each cross-interconnection group includes a first cross-interconnection box and a second cross-interconnection box;

[0065] In an optional embodiment, the first cross-connection box and the second cross-connection box are connected by cables. Each cross-connection box contains multiple cross-connection points for cross-connection between cables. When establishing the first phase sequence detection framework, the connection relationship of the cables under test must first be determined, and then the configuration of the cross-connection groups is determined based on the cable connection relationship. The configuration of each cross-connection group should ensure that it can cover all cross-connection points of the cables under test in order to perform accurate phase matching.

[0066] In this embodiment of the application, the first phase sequence detection framework further includes several directional pulse-coupled slave devices and several phase sequence measurement unit master devices;

[0067] A directional pulse-coupled slave device is used to inject a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield layer of a certain phase cable directly connected to the ground box;

[0068] In an optional embodiment, the phase sequence measurement unit host device is used to detect the positive high-frequency pulse signal injected into the cable terminal.

[0069] In an optional embodiment, the first phase sequence detection framework may include only a directional pulse coupling slave device and a phase sequence measurement unit master device. After the directional pulse coupling slave device and the phase sequence measurement unit master device complete the detection of a set of cross-interconnection groups, the positions of the directional pulse coupling slave device and the phase sequence measurement unit master device are moved to the corresponding positions of the next set of cross-interconnection groups to realize the detection of subsequent cross-interconnection groups.

[0070] In an optional embodiment, the number of directional pulse-coupled slave devices and phase sequence measurement unit master devices in the first phase sequence detection framework can be the same as the number of cross-connection groups, so that different cross-connection groups can be tested simultaneously by different directional pulse-coupled slave devices and phase sequence measurement unit master devices.

[0071] In an optional embodiment, it can be set as follows: Figure 2 The test simulation wiring diagram shown is for the first phase sequence detection frame, where: 1. Cable terminal under test; 2. Cable under test; 3. Outer core of cable metal shield (sheath) connecting wire; 4. Insulation joint; 5. Inner core of cable metal shield (sheath) connecting wire; 6. Cable metal shield (sheath) connecting wire; 7. Grounding box; 8. Rogowski coil; 9. Cross-connection box #2 (i.e., the first cross-connection box in the cross-connection group); 10. Grounding wire; 11. Signal injection transformer; 12. Detection current transformer; 13. Cross-connection box #3 (i.e., the second cross-connection box in the cross-connection group).

[0072] In an optional embodiment, a slave device with directional pulse coupling is installed in the direct grounding box at the beginning of the cable, and a master device for phase sequence measurement unit is installed in the cross-connection box.

[0073] In this embodiment of the application, the directional pulse-coupled slave device for injecting a positive high-frequency pulse signal in a predetermined direction into the grounding wire of the metal shield layer of a certain phase cable directly connected to the grounding box includes:

[0074] The directional pulse-coupled slave device detects the current in the grounding wire of this phase and injects a positive high-frequency pulse signal in a set direction at the zero-crossing point of the current.

[0075] In an optional embodiment, the directional pulse-coupled slave device is connected to the signal injection transformer T0 and the detection current transformer TM via the grounding wire of phase A of the direct-connected ground box. The MCU circuit of the slave device marks the time when the current crosses zero and outputs a positive directional high-frequency pulse signal command after a certain timing combination to ensure that the positive directional high-frequency pulse signal output is within the time of the current crossing zero with an error of no more than 0.1ms.

[0076] In an optional embodiment, a directional pulse-coupled slave device is provided at the cable terminal for injecting a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield (sheath) of a certain phase cable directly connected to the ground box. Moreover, the directional pulse-coupled device detects the current of this phase grounding wire and injects a positive high-frequency pulse signal at the zero-crossing point of the current, so that the phase sequence measurement unit device can detect this signal.

[0077] In an optional embodiment, the phase sequence measurement unit host device, located at the cross-connection box, is used to detect the positive high-frequency pulse signal injected into the cable terminal. The phase sequence measurement unit device uses three Rogowski coils connected to the metal shield (sheath) connection lines of the three-phase cables in the cross-connection box. The positively directional high-frequency pulse signal injected by the Rogowski coil inductive coupling device is high-pass filtered, amplified, and smoothed before being sent to a high-speed sampling circuit. A high-speed AD converter converts the analog signal into a digital signal. The processor divides the three-phase digital signal waveform into yellow, green, and red colors and displays it on a color display screen. The channel displaying the positive waveform signal corresponds to the metal shield (sheath) of the same phase cable, achieving the purpose of phase verification in the cross-connection box. Based on the correct phase identification in the cross-connection box, comparing the logical correspondence between the three-phase waveforms and known waveforms can further identify whether the cross-connection wiring inside the cross-connection box is correct.

[0078] In an optional embodiment, the directional pulse-coupled slave device includes a lithium battery power supply circuit, a boost energy storage module, a positive high-frequency pulse signal output module, a signal detection circuit, a timing combination circuit, and an MCU processing module. The lithium battery power supply circuit provides operating power to the directional pulse-coupled slave device, and the boost energy storage module provides high-voltage power to the positive high-frequency pulse signal output module and is connected to the output terminal of the high-voltage pulse output module. The signal detection circuit monitors the circulating current amplitude on the ground wire, and after processing by the MCU processing module, outputs a positive high-frequency pulse signal output command at the zero-crossing point of the current waveform. The timing combination circuit ensures that the positive high-frequency pulse signal is output at the zero-crossing point of the current.

[0079] In an optional embodiment, the phase sequence measurement unit main unit includes a Rogowski coil, a lithium battery power supply circuit, an isolation amplification and filtering steepening circuit, a signal detection circuit, a high-speed AD sampling circuit, an MCU processing module, and a graphic display module. The lithium battery power supply circuit provides operating power to the main unit. The Rogowski coil is connected to the metal shield (sheath) connection line of the three-phase cable in the cross-connection box, inducing a high-frequency pulse signal. Its output signal passes through the isolation amplification and filtering steepening circuit and enters the signal detection circuit. When the signal detection circuit detects that the signal exceeds its set threshold, it triggers high-speed sampling. The high-speed AD sampling circuit converts the analog signal into a digital signal. The digital signal enters the MCU processing module, where digital filtering removes noise components from the analog signal. The processor divides the filtered three-phase digital signal waveform into yellow, green, and red colors and draws it on the color display screen. The channel displaying the positive waveform signal is the cable metal shield (sheath) connected to the grounding wire of the current transformer with directional pulse coupling slave device, achieving the purpose of phase verification in the cross-connection box, that is, marking the three-phase cable metal shield (sheath) connection lines A, B, and C.

[0080] In an optional embodiment, during testing, a signal injection transformer and a detection current transformer are connected to the metal shield (sheath) connection line of one phase of the cable in the grounding box. The detection current transformer detects the magnitude of the circulating current in this phase, and at the moment the current crosses zero, a high-frequency pulse signal in the positive direction is coupled to the grounding wire of the cable metal shield (sheath) through the signal injection transformer.

[0081] It should be noted that establishing a first phase sequence detection framework based on the cable under test can effectively identify phase sequence errors in cable lines, thereby avoiding power supply instability or faults caused by wiring errors. By establishing this framework, rapid and accurate phase verification of cable cross-connection groups can be achieved, ensuring correct cable line connections. Furthermore, the combined use of a directional pulse-coupled slave device and a phase sequence measurement unit master device makes the phase verification process more efficient and accurate. In practical operation, by injecting a positive high-frequency pulse signal and detecting its zero-crossing point on the grounding wire of the cable's metallic shield, the phase sequence status of the cable can be accurately determined. This detection method not only improves the accuracy of phase verification but also reduces the impact on power supply system operation because it can be performed under energized conditions without interrupting power supply.

[0082] S102, acquire the first verification waveform and the second verification waveform based on the first phase sequence detection framework;

[0083] In this embodiment of the application, obtaining the first verification waveform and the second verification waveform based on the first phase sequence detection framework includes:

[0084] The first phase sequence detection framework includes several cross-interconnection groups, and each cross-interconnection group includes a first cross-interconnection box and a second cross-interconnection box;

[0085] The first verified waveform is the correct phase sequence waveform of the first cross-connection box;

[0086] The second verification waveform is the correct phase sequence waveform of the second cross-connection box.

[0087] In an optional embodiment, there are many ways to obtain the correct phase sequence waveform of the first cross-connect box or the correct phase sequence waveform of the second cross-connect box. For example, the output waveform of the first cross-connect box can be directly measured using an oscilloscope, or waveform data can be obtained through a combination device. The combination device generally includes an oscilloscope module or a waveform display module.

[0088] In the embodiments of this application, the correct phase sequence waveform includes three correct phase waveforms.

[0089] In an optional embodiment, a positive directional high-frequency pulse signal is transmitted through the cable's metal shield (sheath) to the first cross-connection box. The phase sequence measurement unit host device is installed at the second cross-connection box. Three Rogowski coils T1, T2, and T3 (with consistent installation direction) are connected to the cable's metal shield (sheath) connection line in a specific direction at the first cross-connection box. The Rogowski coils sense this pulse signal, which is then amplified and filtered by an isolation and filtering circuit. When the analog signal reaches the trigger threshold and AD sampling is initiated, the MCU of the host device reads the digital signal converted from the three-phase signal by AD. After digital filtering to remove noise components from the analog signal, the processor divides the filtered three-phase digital signal waveform into yellow, green, and red colors and displays it on a color display screen. Figure 3 If the waveform display shows that channel T1 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T1 is phase A. This connection wire is connected to phase A cable, thus achieving the purpose of verifying or calibrating phase A.

[0090] In an optional embodiment, the three-phase digital signal waveform can be displayed in the desired color according to actual needs, and there is no limitation here;

[0091] In an optional embodiment, three Rogowski coils T1, T2, and T3 are threaded onto the cable metal shield (sheath) connection wire of the cross-connection box in a certain direction. The direction can be arbitrarily chosen and is not limited here.

[0092] It should be noted that the correct phase sequence waveform of the first cross-connection box includes the correct phase sequence waveforms of phases A, B, and C. Figure 3 The waveform in ① is the correct waveform when the grounding box A-phase connection signal is injected into the current transformer, which can be used as the A-phase verification waveform in the first verification waveform.

[0093] In an optional embodiment, the signal injection transformer T0 and the detection current transformer TM are connected to phase B of the direct-connection ground box. That is, phase B is used for current detection and the application of a positive directional high-frequency pulse signal. All wiring of the phase sequence measurement unit's main unit remains unchanged. Figure 3 If the waveform display shows that channel T2 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T2 is phase B. This connection wire is connected to the phase B cable, thus achieving the purpose of verifying or calibrating phase B.

[0094] It should be noted that, Figure 3 Waveform ② is the correct waveform when the grounding box B-phase connection signal is injected into the transformer, which can be used as the B-phase verification waveform in the first verification waveform.

[0095] In an optional embodiment, the signal injection transformer T0 and the detection current transformer TM are connected to phase C of the direct-connection ground box. That is, phase C is used for current detection and the application of a positive directional high-frequency pulse signal. All wiring of the phase sequence measurement unit's main unit remains unchanged. Figure 3 In the waveform display, if channel T3 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T3 is phase C. This connection wire is connected to the phase C cable, thus achieving the purpose of verifying or calibrating phase C.

[0096] It should be noted that, Figure 3 Waveform ③ is the correct waveform when the grounding box C-phase connection signal is injected into the transformer, which can be used as the C-phase verification waveform in the first verification waveform.

[0097] In an optional embodiment, the directional pulse-coupled slave device remains in the direct-connection ground box, and the signal injection transformer T0 and the detection current transformer TM are connected to phase A of the direct-connection ground box. That is, phase A is used for current detection and application of a positive directional high-frequency pulse signal. The phase sequence measurement unit master device moves to the No. 3 cross-connection box and connects according to the wiring when checking the phases in the No. 2 cross-connection box. Figure 3 If the waveform display shows that channel T6 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T6 is phase C. This connection wire is connected to the phase C cable, thus achieving the purpose of verifying or calibrating phase C.

[0098] It should be noted that, Figure 3 Waveform ④ is the correct waveform when the grounding box A-phase connection signal is injected into the current transformer, which can be used as the A-phase verification waveform in the second verification waveform.

[0099] In an optional embodiment, the directional pulse-coupled slave device remains in the direct-connected ground box, and the signal injection transformer T0 and the current sensing transformer TM are connected to phase B of the direct-connected ground box, i.e., phase B is used for current sensing and applying a positive directional high-frequency pulse signal. Figure 3 If the waveform display shows that channel T4 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T4 is phase A. This connection wire is connected to phase A cable, thus achieving the purpose of verifying or calibrating phase A.

[0100] It should be noted that, Figure 3 Waveform ⑤ is the correct waveform when the grounding box B-phase connection signal is injected into the current transformer, which can be used as the B-phase verification waveform in the second verification waveform.

[0101] In an optional embodiment, the directional pulse-coupled slave device remains in the direct-connected ground box, and the signal injection transformer T0 and the current sensing transformer TM are connected to phase C of the direct-connected ground box, i.e., phase C is used for current sensing and applying a positive directional high-frequency pulse signal. Figure 3 If the waveform display in section ⑥ shows that channel T5 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection wire connected to T5 is phase B. This connection wire is connected to the phase B cable, thus achieving the purpose of verifying or calibrating phase B.

[0102] It should be noted that, Figure 3 Waveform ⑥ is the correct waveform when the grounding box C-phase connection signal is injected into the transformer, which can be used as the C-phase verification waveform in the second verification waveform.

[0103] It should be noted that acquiring the first and second verification waveforms based on the first phase sequence detection framework provides an accurate waveform verification diagram, thus offering an intuitive reference for phase verification operations. In this way, operators can clearly identify the phase sequence status of the cable line, ensuring the accuracy of each step of the operation. Furthermore, this method allows phase verification to be performed while the cable is energized, greatly improving work efficiency while reducing potential impacts on the stability of the power supply system. In practical applications, this technology is suitable not only for newly built cable cross-connection systems but also for the maintenance and troubleshooting of existing systems, providing strong technical support for the safe and stable operation of power systems.

[0104] S103, acquire the first detection waveform and the second detection waveform based on the first phase sequence detection framework;

[0105] S104, perform phase verification of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

[0106] In this embodiment of the application, the determination of the energized phase of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform includes:

[0107] Based on the first verification waveform, the first detection waveform is used to determine the first charged phase;

[0108] The second charged phase determination is performed on the first detection waveform based on the second verification waveform;

[0109] Based on the judgment results of the first charged phase and the second charged phase, the charged phase of the cross-interconnection group is determined.

[0110] In this embodiment of the application, the determination of the energized phase of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform further includes:

[0111] Perform charged phase identification on all cross-interconnected groups in the first phase sequence detection framework;

[0112] Based on the results of the energized phase comparison, complete the energized phase comparison of the cross-connection system of the cables under test.

[0113] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C in the #2 cross-connection box, i.e., after acquiring the first verification waveform, the signal is re-injected into the current transformer T0 and the current sensing transformer TM and connected to phase A of the direct-connection ground box. That is, phase A is in the current sensing state and a positive directional high-frequency pulse signal is applied. The waveforms of phases A, B, and C on the display, i.e., the first detection waveform, are observed to determine if they conform to the specified parameters. Figure 3 If the waveform in ① is correct, it indicates that the internal wiring of the first-level cross-connection box is correct; otherwise, open the cover of this cross-connection box, correct the internal wiring, and proceed to the next test.

[0114] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C in the #2 cross-connection box, i.e., after acquiring the first verification waveform, the signal is re-injected into the current transformer T0 and the current sensing transformer TM and connected to phase B of the direct-connection ground box. That is, phase B is in the current sensing state and a positive directional high-frequency pulse signal is applied. The waveforms of phases A, B, and C on the display, i.e., the first detection waveform, are observed to determine if they conform to the specified parameters. Figure 3 If the waveform in step ② is correct, it indicates that the internal wiring of the first-level cross-connection box is correct; otherwise, open the cover of this cross-connection box, correct the internal wiring, and proceed to the next test.

[0115] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C in the #2 cross-connection box, i.e., after acquiring the first verification waveform, the signal is re-injected into the current transformer T0 and the current sensing transformer TM and connected to phase A (phase C) of the direct-connection ground box. A positive directional high-frequency pulse signal is applied during current sensing, and the three-phase waveforms of phases A, B, and C on the display are observed; this is the first detection waveform. The system is then checked to see if the waveforms conform to the specified parameters. Figure 3 If the waveform in ③ is correct, it indicates that the internal wiring of the first-level cross-connection box is correct; otherwise, open the cover of this cross-connection box, correct the internal wiring, and proceed to the next test.

[0116] It should be noted that the waveform judgment process for different phases in the first detection waveform is the first charged nucleus phase judgment.

[0117] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C of the No. 3 cross-connection box (i.e., after acquiring the second verification waveform), the signal injection transformer T0 and the current sensing transformer TM are reconnected to phase A of the direct-connection ground box. That is, phase A is monitored by current sensing and a positive directional high-frequency pulse signal is applied. The waveforms of phases A, B, and C on the display (i.e., the second detection waveform) are observed to determine if they conform to the specified parameters.Figure 3 If the waveform in step ④ is correct, it indicates that the internal wiring of the No. 3 cross-connection box is correct; otherwise, open the cover of this cross-connection box and correct the internal wiring.

[0118] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C of the No. 3 cross-connection box (i.e., after acquiring the second verification waveform), the signal is re-injected into the current transformer T0 and the current sensing transformer TM and connected to phase A of the direct-connection ground box (i.e., phase B). A positive directional high-frequency pulse signal is applied while detecting the current, and the waveforms of phases A, B, and C on the display (i.e., the first detection waveform) are observed to determine if they conform to the specified parameters. Figure 3 If the waveform in step ⑤ is correct, it indicates that the internal wiring of the No. 3 cross-connection box is correct; otherwise, open the cover of this cross-connection box and correct the internal wiring.

[0119] In an optional embodiment, after obtaining the correct phase sequence of phases A, B, and C of the No. 3 cross-connection box (i.e., after acquiring the second verification waveform), the signal is re-injected into the current transformer T0 and the current sensing transformer TM and connected to phase A of the direct-connection ground box (i.e., phase C). A positive directional high-frequency pulse signal is applied while detecting the current, and the waveforms of phases A, B, and C on the display (i.e., the first detection waveform) are observed to determine if they conform to the specified parameters. Figure 3 If the waveform in step ⑥ is correct, it indicates that the internal wiring of the No. 3 cross-connection box is correct; otherwise, open the cover of this cross-connection box and correct the internal wiring.

[0120] It should be noted that the process of judging the waveforms of different phases in the second detection waveform is the second charged nucleus phase judgment.

[0121] In an optional embodiment, if the waveform does not match, it may be due to incorrect phase sequence connection, incorrect connection of inner and outer cores of the same phase, or short circuit in the cross-connection box. The above operation can be used to determine which phase is wrong, providing a basis for further fault diagnosis and repair.

[0122] In an optional embodiment, after both cross-connect boxes in this cross-connection group have finished being judged, the directional pulse-coupled slave device is installed to the next level direct-connection ground box. Repeating the operation can verify whether the phase sequence of the subsequent cross-connection boxes is correct and whether the internal wiring is correct.

[0123] In an optional embodiment, such as Figure 4As shown, the correct waveforms displayed on the color display of the phase sequence measurement unit's main unit are as follows: waveforms ①, ②, and ③ are the waveforms detected by the Rogowski coils T1, T2, and T3 of the #2 cross-interconnection box, corresponding to the correct waveforms when the grounding box A, B, and C phases are connected to the current transformer via signal injection; waveforms ④, ⑤, and ⑥ are the waveforms detected by the Rogowski coils T4, T5, and T6 of the #3 cross-interconnection box, corresponding to the correct waveforms when the grounding box A, B, and C phases are connected to the current transformer via signal injection. These waveforms, with their positive-direction high-frequency pulse signals, demonstrate that the phase sequence corresponding to the Rogowski coil connection matches the phase sequence of the signal injected into the current transformer, thus achieving the purpose of phase verification. During the testing of the No. 2 cross-connection box, the cross-connection wiring inside the No. 2 cross-connection box is judged based on the waveform diagrams of T1, T2, and T3. During the testing of the No. 3 cross-connection box, the cross-connection wiring inside the No. 3 cross-connection box is judged based on the waveform diagrams of T4, T5, and T6. Moreover, these operations can be performed with the cables energized, ultimately achieving the goal of verifying the phase sequence of the entire cross-connection box under energized conditions.

[0124] In an optional embodiment, the cable metal shield (sheath) and the ground can be used to form distributed parameters. When a directional high-frequency pulse signal is transmitted along the ground in the cable metal shield (sheath), a directional pulse coupling device and a measurement unit device are installed on the grounding line of the direct connection ground box and the cross-connection ground box, respectively. The coupling device injects a positive directional high-frequency pulse signal at the zero point of a certain phase loop of the grounding line of the direct connection ground box. The high-frequency pulse signal is transmitted along the cable metal shield (sheath) to the cross-connection box. The phase sequence measurement unit device is located on the three-phase cable metal shield (sheath) connection line of the cross-connection box. After the signal is sensed by the Rogowski coil, it is filtered, amplified, and smoothed before being sent to the high-speed sampling circuit. The high-speed AD converter converts the analog signal into a digital signal. The processor divides the three-phase digital signal waveform into yellow, green, and red colors and draws it on the color display screen. The channel displaying the positive directional waveform signal is the same phase cable metal shield (sheath), thus achieving the purpose of phase verification in the cross-connection box. Based on the correct phase sequence of the cross-connection box, by comparing the logical correspondence between the three-phase waveforms and known waveforms, the correctness of the internal cross-connection wiring can be further identified. This invention can verify the correct external phase sequence of the cross-connection box and further identify the accuracy of the internal cross-connection wiring, improving the work efficiency of power operation and maintenance personnel and the reliability of power supply, while saving manpower and resources.

[0125] In summary, this invention proposes a live phase sequence verification method for cable cross-connection systems. It establishes a first phase sequence detection framework based on the cable under test; acquires a first verification waveform and a second verification waveform based on the first phase sequence detection framework; acquires a first detection waveform and a second detection waveform based on the first phase sequence detection framework; and performs live phase sequence verification of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform. This method can verify the correct external phase sequence relationship of the cross-connection box and further identify the accuracy of the internal cross-connection wiring, improving the work efficiency and power supply reliability of power maintenance personnel and saving manpower and resources. This application can verify whether the phase sequence of the cross-connection box is wired according to regulations under live conditions without opening the box, ensuring the accuracy and reliability of testing under any high current conditions. This solves the current problem that testing can only be performed under low current conditions (less than 30A) and requires opening the cover for inspection. It enables rapid verification of the phase sequence of the cross-connection box and determines the correctness of the internal cross-connection wiring, improving the work efficiency and power supply reliability of power maintenance personnel, saving significant manpower and resources, reducing power outage time, and alleviating the workload of maintenance personnel. The advantages of this application lie in its ability to operate under high current conditions without opening the cover, allowing for accurate verification of the internal cross-connection wiring. It can be operated and measured under various complex operating conditions, with reliable measurement preparation, high speed, and lightweight design for easy portability. It has significant social and economic benefits.

[0126] Example 2

[0127] This embodiment also provides a preferred configuration for the positive directional pulse coupling slave device, such as... Figure 5 As shown, the positive directional pulse coupling slave device comprises a circulating current detection circuit, a square wave forming zero-crossing detection circuit, a timing combination circuit, a positive directional high-frequency pulse output module, a lithium battery power supply circuit, an MCU processing module, and a boost energy storage circuit. The lithium battery powers the entire device. At the zero-crossing moment of the circulating current, the MCU processing module, through the timing combination circuit, injects a signal into the current transformer and couples a positive directional high-frequency pulse signal to the grounding wire of the cable's metal shield (sheath). The boost energy storage circuit provides a 400V high-voltage power supply to the positive directional high-frequency pulse output module.

[0128] like Figure 6As shown, the phase sequence measurement unit main unit includes a high-frequency detection circuit, a signal isolation amplification and filtering steepening circuit, a trigger circuit, a high-speed AD sampling circuit, a graphic display module, an MCU processing circuit, and a lithium battery power supply circuit. The lithium battery power supply circuit provides operating power to the main unit. The Rogowski coil in the high-frequency detection circuit is connected to the metal shield (sheath) connection line of the three-phase cable in the cross-connection box to induce a high-frequency pulse signal. Its output signal passes through the isolation amplification and filtering steepening circuit and enters the signal detection circuit. When the signal detection circuit detects that the signal exceeds its set threshold, it triggers high-speed sampling. The high-speed AD sampling circuit converts the analog signal into a digital signal. The digital signal enters the MCU processing module, where digital filtering removes noise components from the analog signal. The processor divides the filtered three-phase digital signal waveform into yellow, green, and red colors and draws it on the color display screen. The channel displaying the positive waveform signal is the cable metal shield (sheath) connected to the grounding wire of the current transformer with directional pulse coupling slave device, which is in the same phase. This achieves the purpose of phase verification in the cross-connection box, that is, it marks the three-phase cable metal shield (sheath) connection lines A, B, and C.

[0129] like Figure 7 The figures shown are the program logic block diagrams of the MCU processing circuits in the positive directional pulse coupling slave device and the phase sequence measurement unit master device, respectively. After power-on initialization, the positive directional pulse coupling slave device detects the rising edge of the circulating current square wave. After detecting the rising edge, it delays for 7ms to start the positive high-frequency pulse output command. After outputting the command, it delays for 30s and re-detects the rising edge of the circulating current square wave. This cycle repeats every 30s.

[0130] After power-on initialization, the phase sequence measurement unit starts high-speed AD sampling in a loop. After digital filtering and graphic drawing, while drawing the graphic, it identifies which channel is the positive directional pulse signal and determines that this channel is the in-phase sequence signal. Then, it delays for 10 seconds, clears the waveform, and prepares for the arrival of the next positive high-frequency pulse signal. The cycle repeats every 10 seconds.

[0131] Figure 7 This is a circuit diagram of an isolation amplification and filtering steepening circuit. Its main function is to filter out low-frequency signals and amplify, filter, and steepen high-frequency signals. Figure 8 T1 is a high-frequency pulse current transformer that receives the output signal from the Rogowski coil, isolates low-frequency signals, and separates strong and weak currents. Since it reflects dI / dt, it also has a steepening effect. U1 is a voltage follower that improves signal input impedance and load capacity. The signal is amplified by U2, and C2 removes the DC component, allowing high-frequency components to pass. T2 is a pulse voltage transformer that reflects dU / dt, further steepening the signal based on the steepening effect of T1 and further isolating low-frequency noise signals.

[0132] Figure 9This is the circuit diagram for the trigger circuit, which detects the arrival time of a positive high-frequency pulse signal and whether the voltage of the energy storage capacitor in the 400V boost energy storage circuit reaches 400V. The voltage divider circuit consisting of R3, R4, and R5, R6 provides the threshold voltage for the comparator. U1B responds to the positive pulse signal, and U1A responds to the negative pulse signal, detecting the positive and negative pulse signals respectively. When the positive or negative pulse exceeds the threshold, the comparator flips, initiating high-speed AD sampling. Resistor R9 is the sampling resistor for the 400V voltage. When the voltage reaches 400V, U3B outputs a high level, and U4A improves signal quality.

[0133] Figure 10 This is the circuit diagram of a timing combination circuit. When a high-frequency pulse signal in the positive direction is coupled to the grounding wire of the cable's metal shield (sheath) through the signal injection transformer, K1 and K2 activate respectively, and the high-voltage pulse output module injects a high-frequency pulse signal into the cable. After detecting the S1 signal, the signal detection circuit starts the delay loop, and the counter begins counting. When the preset time is reached, K1 and K2 return, providing a path for the S2 signal and ensuring that the detection circuit can detect the S2 signal.

[0134] like Figure 11 This is the circuit diagram for the high-voltage pulse output module. When no pulse is output, the high-voltage energy storage capacitor C1 is in a charging state. When a pulse signal is injected into the cable, relay J2 first activates to connect the circuit, and Q1 activates to inject a high-voltage pulse signal into the cable. R2 limits the charging current and charging time, while R1 and C1 control the amplification time.

[0135] like Figure 12 This is the circuit diagram of the MCU processing module. This circuit is the common core processing hardware part of the positive direction pulse coupling slave device and the phase sequence measurement unit master device. Different devices execute different application programs and run different logic flows. Among them, U1 is the core processor, U2 is a large-capacity SDRAM, and U3 is FLASH.

[0136] like Figure 13 This is a circuit diagram for a 400V boost energy storage circuit. This circuit boosts the 12V voltage of the lithium battery to 400V to charge the energy storage capacitor C4. U1, rheostat R16, and capacitor C2 form an oscillation circuit. Q1 and Q2 provide push-pull outputs, driving Q3 to provide a high-frequency square wave power supply to T1, which is a boost transformer. By adjusting R15 and R16, U1 outputs different oscillation frequencies, causing the output voltage of T1 to reach 500V, boosting the 12V voltage to 400V. This 400V voltage charges the high-voltage energy storage capacitor C3. P1 provides operating power to U1 and the various drive circuits. R8 provides a discharge circuit for C1 when the device is off, preventing accidental electric shock.

[0137] like Figure 14This is a circuit diagram for a lithium battery and its power supply circuit. This circuit provides the base voltage for each functional circuit, outputting the 12V voltage from the lithium battery as 3.3V, ±5V, and 24V respectively. Specifically, P1 outputs 3.3V to power the core processor, the logic circuit CPLD, and the memory chip; P2 outputs 24V to power the relay; and P3 and P4 together form a ±5V power supply to power the operational amplifier.

[0138] Example 3

[0139] This embodiment also provides a live phase comparison system for a cable cross-connection system, including:

[0140] The framework establishment module is used to establish the first phase sequence detection framework based on the cable under test.

[0141] The waveform acquisition module is used to acquire the first and second verification waveforms based on the first phase sequence detection framework.

[0142] The detection waveform acquisition module is used to acquire the first detection waveform and the second detection waveform based on the first phase sequence detection framework.

[0143] The judgment module is used to determine the live phase of the cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

[0144] The above-mentioned unit modules can be embedded in the processor of the computer device in hardware form or independent of it, or they can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of the above modules.

[0145] This embodiment also provides a computer device, which may be a terminal, and its internal structure diagram may be as follows. Figure 1As shown, the computer device includes a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a method for energized phase integration of a cable cross-connection system. The display screen can be an LCD screen or an e-ink display screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0146] This embodiment also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, it performs the following steps:

[0147] Establish a first phase sequence detection framework based on the cable under test;

[0148] Obtain the first and second verification waveforms based on the first phase sequence detection framework;

[0149] Obtain the first detection waveform and the second detection waveform based on the first phase sequence detection framework;

[0150] The live phase comparison of the cable cross-connection system is determined based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

[0151] It should be noted that the above 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0152] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0153] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0154] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0155] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes ​ The steps of the function specified in one or more boxes.

[0156] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0157] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for energized phase comparison in a cable cross-connection system, characterized in that, include: Establish a first phase sequence detection framework based on the cable under test; Obtain the first verification waveform and the second verification waveform based on the first phase sequence detection framework; Obtain the first detection waveform and the second detection waveform based on the first phase sequence detection framework; The live phase comparison of the cable cross-connection system is determined based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

2. The live phase comparison method for a cable cross-connection system as described in claim 1, characterized in that, The acquisition of the first verification waveform and the second verification waveform based on the first phase sequence detection framework includes: The first phase sequence detection framework includes several cross-interconnection groups, and each cross-interconnection group includes a first cross-interconnection box and a second cross-interconnection box; The first verification waveform is the correct phase sequence waveform of the first cross-connect box; The second verification waveform is the correct phase sequence waveform of the second cross-connect box.

3. The live phase comparison method for a cable cross-connection system as described in claim 2, characterized in that, The step of determining the live phase of a cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform includes: Based on the first verification waveform, a first charged phase determination is made on the first detection waveform; Based on the second verification waveform, a second charged phase determination is performed on the first detection waveform; Based on the judgment results of the first charged phase determination and the second charged phase determination, the charged phase determination of the cross-interconnection group is performed.

4. The live phase comparison method for a cable cross-connection system as described in claim 3, characterized in that, The step of determining the live phase of a cable cross-connection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform also includes: Perform charged phase identification on all cross-interconnected groups in the first phase sequence detection framework; Based on the results of the energized phase comparison, complete the energized phase comparison of the cross-connection system of the cables under test.

5. The live phase comparison method for a cable cross-connection system as described in claim 4, characterized in that, The establishment of the first phase sequence detection framework based on the cable under test includes: The first phase sequence detection framework also includes several directional pulse-coupled slave devices and several phase sequence measurement unit master devices; The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield layer of a certain phase cable in a direct connection box. The phase sequence measurement unit host device is used to detect the positive high-frequency pulse signal injected into the cable terminal.

6. The live phase comparison method for a cable cross-connection system as described in claim 5, characterized in that, The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal in a set direction into the grounding wire of the metal shield layer of a certain phase cable directly connected to the ground box, including: The directional pulse-coupled slave device detects the current in this phase ground wire and injects a positive high-frequency pulse signal in a set direction at the zero-crossing point of the current.

7. The live phase comparison method for a cable cross-connection system as described in claim 6, characterized in that, The correct phase sequence waveform includes three correct phase waveforms.

8. A live phase comparison system for a cable cross-connection system, characterized in that, include: The framework establishment module is used to establish the first phase sequence detection framework based on the cable under test. The waveform acquisition module is used to acquire the first and second verification waveforms based on the first phase sequence detection framework. The detection waveform acquisition module is used to acquire a first detection waveform and a second detection waveform based on the first phase sequence detection framework. The judgment module is used to judge the energized phase of the cable cross-interconnection system based on the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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