Electrified nuclear phase method and system for cable crossing interconnection system

Abstract

The invention discloses a cable crossing interconnection system electrified phase checking method and system. The method comprises the following steps: establishing a first phase sequence detection framework based on a to-be-detected cable; acquiring a first check waveform and a second check 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 according to the first check waveform, the second check waveform, the first detection waveform and the second detection waveform, carrying out electrified nuclear phase judgment on the cable crossing interconnection system. The external correct phase sequence relation of the cross interconnection box can be verified, the internal cross interconnection wiring accuracy of the cross interconnection box is further identified, the working efficiency and the power supply reliability of power operation and maintenance personnel are improved, and manpower and material resources are saved.

Description

Technical Field

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

[0002] In the power system, the cable cross-connection system is an important part of ensuring the stability and safety of power transmission. With the continuous expansion of the scale of the power grid and the continuous 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 to the normal operation of the system. The wrong phase sequence will not only cause the power system to malfunction, but may also cause serious safety accidents. Therefore, effective phase sequence detection of the cable cross-connection system has become an important part of power operation and maintenance.

[0003] Traditional cable phase sequence detection methods mostly rely on power outage detection, which is not only time-consuming and labor-intensive, but also may affect the overall operation of the power grid when power outages are detected at some key 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 certain safety risks. 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 of the invention

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

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

[0006] Therefore, the present invention provides a method and system for energizing phase checking of a cable cross-connection system, which can solve the problems mentioned in the background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a method for performing live phase verification in a cable cross-connection system, comprising:

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

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

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

[0012] The live core phase judgment of the cable cross-connection system is performed according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform.

[0013] As a preferred solution of the live phase checking method for the cable cross-connection system of the present invention, the obtaining of the first checking waveform and the second checking waveform based on the first phase sequence detection framework includes:

[0014] The first phase sequence detection framework includes a plurality of cross-connection groups, and the cross-connection groups include a first cross-connection box and a second cross-connection box;

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

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

[0017] As a preferred solution of the live phase verification method for a cable cross-connection system of the present invention, the live phase verification judgment of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform comprises:

[0018] Performing a first charged core phase judgment on the first detection waveform based on the first verification waveform;

[0019] Performing a second charged core phase judgment on the first detection waveform based on the second verification waveform;

[0020] According to the judgment results of the first charged core phase judgment and the second charged core phase judgment, the charged core phase judgment of the cross-connected group is performed.

[0021] As a preferred solution of the cable cross-connection system live phase verification method of the present invention, wherein: the live phase verification judgment 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:

[0022] Performing live core phase judgment on all cross-connected groups in the first phase sequence detection framework;

[0023] Complete the live phase verification of the cable cross-connection system to be tested based on the live phase verification judgment results.

[0024] As a preferred solution of the live phase verification method for the cable cross-connection system of the present invention, the establishment of a first phase sequence detection framework based on the cable to be tested includes:

[0025] The first phase sequence detection framework also includes a plurality of directional pulse coupling slave devices and a plurality of phase sequence measurement unit host devices;

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

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

[0028] As a preferred solution of the live phase core method of the cable cross-connection system of the present invention, the directional pulse coupling slave device is used to inject a positive high-frequency pulse signal of a set direction into the metal shielding layer grounding wire of a certain phase cable of the direct-connected grounding box, including:

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

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

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

[0032] A framework establishment module, used for establishing a first phase sequence detection framework based on the cable to be tested;

[0033] A verification waveform acquisition module, used to acquire a first verification waveform and a second verification waveform based on the first phase sequence detection framework;

[0034] A detection waveform acquisition module, 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 live core phase of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform.

[0036] In a third aspect, the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned method when executing the computer program.

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

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a method and system for live phase verification of a cable cross-connection system, establishes a first phase sequence detection framework based on the cable to be tested; obtains a first verification waveform and a second verification waveform based on the first phase sequence detection framework; obtains a first detection waveform and a second detection waveform based on the first phase sequence detection framework; and performs live phase verification judgment of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform. It is capable of verifying the correct external phase sequence relationship of the cross-connection box, and further identifying the accuracy of the cross-connection wiring inside the cross-connection box, thereby improving the work efficiency and power supply reliability of power operation and maintenance personnel, and saving manpower and material resources. The present application can verify whether the phase sequence of the cross-connection box is wired according to the regulations under live conditions. Without opening the cover, it is possible to know whether the cross-connection wiring inside the cross-connection box is correct, which can ensure the accuracy and reliability of the test under any high current conditions. This solves the problem that the test can only be carried out under low current conditions less than 30A and the cover needs to be opened for inspection. It can quickly verify the wiring phase sequence of the cross-connection box and determine whether the internal cross-connection wiring is correct, thereby improving the work efficiency and power supply reliability of power operation and maintenance personnel, saving a lot of manpower and material resources, reducing power outage time, and reducing the labor intensity of operation and maintenance personnel. The advantage provided by this application is that it can be operated live under high current conditions, and it is possible to know whether the internal cross-connection wiring of the cross-connection box is correct without opening the cover. It can be operated and measured under various complex working conditions, and the measurement preparation is reliable, fast, light, and easy to carry. It has significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0040] Figure 1 A method flow chart of a live phase verification method and system for a cable cross-connection system provided by an embodiment of the present invention;

[0041] Figure 2 A cable cross-connection system live phase verification method and a measurement simulation wiring diagram of the system provided by an embodiment of the present invention;

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

[0043] Figure 4A structural block diagram of a cable cross-connection system live phase core method and a directional pulse coupling slave device of the system provided by an embodiment of the present invention;

[0044] Figure 5 A structural block diagram of a live phase verification method for a cable cross-connection system and a phase sequence measurement unit host device of the system provided by an embodiment of the present invention;

[0045] Figure 6 A live phase verification method for a cable cross-connection system and a logic block diagram of the master and slave programs of the system provided by an embodiment of the present invention;

[0046] Figure 7 A circuit diagram of a signal isolation, amplification and filtering steepening circuit of a cable cross-connection system live phase core method and system provided by an embodiment of the present invention;

[0047] Figure 8 A circuit diagram of a cable cross-connection system live phase verification method and a signal triggering circuit of the system provided by an embodiment of the present invention;

[0048] Fig. 9 A circuit diagram of a timing combination circuit of a cable cross-connection system energized phase verification method and system provided by an embodiment of the present invention;

[0049] Fig.10 A circuit diagram of a high-voltage pulse output module of a cable cross-connection system energized phase verification method and system provided by an embodiment of the present invention;

[0050] Fig.11 A circuit schematic diagram of a live phase core method of a cable cross-connection system and an MCU processing module of the system provided by an embodiment of the present invention;

[0051] Fig.12 A circuit diagram of a 400V boost energy storage circuit of a cable cross-connection system live core phase method and system provided by an embodiment of the present invention;

[0052] Fig.13 A circuit diagram of a cable cross-connection system live phase verification method and a lithium battery and a power supply circuit of the system provided by an embodiment of the present invention;

[0053] Fig.14 An internal structural diagram of a live phase verification method for a cable cross-connection system and a computer device of the system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0055] Example 1

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

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

[0058] The present application provides a method that can effectively solve the above-mentioned problems. Next, multiple embodiments will be combined to explain in detail how to implement the live phase verification method of the cable cross-connection system;

[0059] Figure 1 A method flow chart of a live phase verification method and system for a cable cross-connection system is shown, including:

[0060] S101, establishing a first phase sequence detection framework based on the cable to be tested;

[0061] In an optional embodiment, the first phase sequence detection framework can be designed by different means, for example, using a high-precision sensor array to capture the current signal in the cable, and analyzing the phase information of the cable through advanced signal processing algorithms. Machine learning technology can also be used to intelligently identify and verify the phase sequence of the cable. It can also be a specific framework designed based on the underlying phase judgment logic.

[0062] In the embodiment of the present application, the first phase sequence detection framework is designed by using the underlying phase judgment logic;

[0063] In an embodiment of the present application, establishing a first phase sequence detection framework based on the cable to be tested includes:

[0064] The first phase sequence detection framework includes a plurality of cross-connection groups, each of which includes a first cross-connection box and a second cross-connection box;

[0065] In an optional embodiment, the first cross-connection box and the second cross-connection box are connected by cables, and each cross-connection box is provided with a plurality of cross-connection points for realizing cross-connection between cables. When establishing the first phase sequence detection framework, it is first necessary to determine the connection relationship of the cables to be tested, and then determine the configuration of the cross-connection group according to the connection relationship of the cables. The configuration of each cross-connection group should ensure that all cross-connection points of the cables to be tested can be covered, so as to perform accurate phase verification judgment.

[0066] In the embodiment of the present application, the first phase sequence detection framework further includes a plurality of directional pulse coupling slave devices and a plurality of phase sequence measurement unit host devices;

[0067] The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal in a set direction into the metal shielding layer grounding wire of a certain phase cable in the direct-connected grounding box;

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

[0069] In an optional embodiment, the first phase sequence detection framework may include only one directional pulse coupling slave device and one phase sequence measurement unit host device. When the directional pulse coupling slave device and the phase sequence measurement unit host device complete the detection of one group of cross-connection groups, the positions of the directional pulse coupling slave device and the phase sequence measurement unit host device are changed to the corresponding positions of the next group of cross-connection groups, so as to realize the detection of subsequent cross-connection groups.

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

[0071] In an optional embodiment, it can be set as follows Figure 2 The test simulation wiring diagram for the first phase sequence detection framework is shown, wherein: 1. the cable terminal to be tested; 2. the cable to be tested; 3. the outer core of the cable metal shielding (sheath) connecting wire; 4. the insulating joint; 5. the inner core of the cable metal shielding (sheath) connecting wire; 6. the cable metal shielding (sheath) connecting wire; 7. the grounding box; 8. the Rogowski coil; 9. the 2# cross-connection box (i.e., the first cross-connection box in the cross-connection group); 10. the grounding wire; 11. the signal injection transformer; 12. the detection current transformer; 13. the 3# cross-connection box (i.e., the second cross-connection box in the cross-connection group).

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

[0073] In the embodiment of the present application, the directional pulse coupling slave device is used to inject a positive high-frequency pulse signal of a set direction into the metal shielding layer grounding wire of a certain phase cable of the direct-connected grounding box, including:

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

[0075] In an optional embodiment, a directional pulse coupling slave device is connected to the signal injection transformer T0 and the detection current transformer TM in the A phase grounding wire of the direct-connected grounding box, and the slave device MCU circuit marks the current zero-crossing moment, and outputs a positive directional high-frequency pulse signal instruction after a certain timing combination, ensuring that the positive directional high-frequency pulse signal is output at the current zero-crossing time, and the error does not exceed 0.1ms;

[0076] In an optional embodiment, a directional pulse coupling slave device is provided at the cable terminal, and is used to inject a positive high-frequency pulse signal of a set direction into the metal shield (sheath) grounding wire of a certain phase cable of the direct-connected grounding box, and the directional pulse coupling device detects the current of the phase grounding wire, and injects a positive high-frequency pulse signal at the zero-crossing point of the current, so as to facilitate the phase sequence measurement unit device to detect the signal;

[0077] In an optional embodiment, a phase sequence measurement unit host device is provided at the cross-connection box, and is used to detect the positive high-frequency pulse signal injected at the cable terminal. The phase sequence measurement unit device uses three Rogowski coils sleeved on the three-phase cable metal shield (sheath) connection line of the cross-connection box. The positive high-frequency pulse signal injected by the Rogowski coil inductive coupling device is sent to the high-speed sampling circuit after high-pass filtering, amplification, and smoothing. The high-speed AD 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 a color display screen. The channel that displays the positive direction waveform signal is the metal shield (sheath) of the same-phase cable, thereby achieving the purpose of cross-connection box phase verification. On the basis of the correct phase identification of the cross-connection box, the logical correspondence between the three-phase waveform and the known waveform is compared to further identify whether the cross-connection wiring inside the cross-connection box is correct;

[0078] In an optional embodiment, a directional pulse coupled slave device includes a lithium battery power supply circuit, a boost energy storage module, a positive direction 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 a working power supply for the directional pulse coupled slave device, and the boost energy storage module provides a high-voltage power supply for the positive direction high-frequency pulse signal output module, and is connected to the output end of the high-voltage pulse output module; the signal detection circuit monitors the circulating current amplitude on the ground wire, and is processed by the MCU processing module. At the moment when the current waveform passes through the zero point, it outputs a positive direction high-frequency pulse signal output instruction, and through the timing combination circuit, it ensures that the positive direction high-frequency pulse signal is output at the current zero point.

[0079] In an optional embodiment, the phase sequence measurement unit host device 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 a working power supply for the host, and the Rogowski coil is sleeved on the three-phase cable metal shield (sheath) connection line of 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 the threshold set by it, it triggers high-speed sampling, and the high-speed AD sampling circuit converts the analog signal into a digital signal. The digital signal enters the MCU processing module, and the noise components in the analog signal are filtered out by digital filtering. The processor divides the filtered three-phase digital signal waveform into yellow, green, and red colors and draws it on a color display screen. The channel displaying the positive direction waveform signal is the cable metal shield (sheath) that is in the same phase as the ground wire of the directional pulse coupling slave device coupled to the transformer sleeve, so as to achieve the core phase purpose of the cross-connection box, that is, the three-phase cable metal shield (sheath) connection lines A, B, and C are calibrated.

[0080] In an optional embodiment, when conducting a test, the signal injection transformer and the detection current transformer are sleeved on the metal shield (sheath) connecting line of a phase cable in the grounding box. The detection current transformer detects the size of the circulating current of this phase, and when the current passes through zero point, the signal injection transformer couples a high-frequency pulse signal in the positive direction to the cable metal shield (sheath) grounding wire.

[0081] It should be noted that establishing a first phase sequence detection framework based on the cable to be tested can effectively identify phase sequence errors in the cable line, thereby avoiding instability or failure of the power supply system caused by wiring errors. By establishing the first phase sequence detection framework, rapid and accurate phase checking of the cable cross-connection group can be achieved to ensure the correct connection of the cable line. In addition, the coordinated use of the directional pulse coupling slave device and the phase sequence measurement unit host device makes the phase checking process more efficient and accurate. In actual operation, the phase sequence state of the cable can be accurately judged by injecting a positive high-frequency pulse signal and detecting its zero crossing point on the grounding wire of the cable metal shielding layer. This detection method not only improves the accuracy of the phase checking, but also reduces the impact on the operation of the power supply system, because the detection can be performed in a live state without interrupting the power supply.

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

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

[0084] The first phase sequence detection framework includes a plurality of cross-connection groups, each of which includes a first cross-connection box and a second cross-connection box;

[0085] The first check 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-connection box or the correct phase sequence waveform of the second cross-connection box. For example, an oscilloscope can be used to directly measure the output waveform of the first cross-connection box, or waveform data can be obtained through a combination device, and the combination device generally includes an oscilloscope module or a waveform display module;

[0088] In the embodiment of the present application, the correct phase sequence waveform includes three correct waveforms of different phases.

[0089] In an optional embodiment, a positive directional high-frequency pulse signal is transmitted in the cable metal shield (sheath) to reach the first cross-connection box, and the phase sequence measurement unit host device is installed at the 2# cross-connection box. In a certain direction, three Rogowski coils T1, T2, and T3 are sleeved on the cable metal shield (sheath) connection line of the first cross-connection box (maintain the same installation direction). The Rogowski coil senses this pulse signal, and after isolation amplification and filtering steepening circuit, when the analog signal reaches the trigger threshold and starts AD sampling, the MCU of the host device reads the digital signal of the three-phase signal AD conversion, and the noise components in the analog signal are filtered out by digital filtering. The processor divides the filtered three-phase digital signal waveform into three colors of yellow, green, and red and draws it on the color display screen, such as Figure 3 In the waveform display, the display shows that channel T1 is a positive waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T1 is phase A, and this connection line is connected to the A-phase cable, so the purpose of checking or calibrating the A-phase is achieved;

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

[0091] In an optional embodiment, three Rogowski coils T1, T2, and T3 are sleeved on the cable metal shield (sheath) connection line of the cross-connection box in a certain direction. The direction can be selected arbitrarily 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 the three phases A, B, and C. Figure 3 The waveform ① is the correct waveform when the A-phase socket signal of the grounding box is injected into the mutual inductor, 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 set TM are connected to the B phase of the direct-connected ground box, that is, the B phase detects the current and applies a positive directional high-frequency pulse signal, and all the wiring of the phase sequence measurement unit host device remains unchanged, such as Figure 3 In the waveform display of ②, the display shows that channel T2 is a positive direction waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T2 is phase B, and this connection line is connected to the B-phase cable, so as to achieve the purpose of checking or calibrating the B-phase;

[0094] It should be noted that Figure 3 The waveform ② is the correct waveform when the B-phase socket signal of the grounding box is injected into the mutual inductor, 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 the C phase of the direct-connected grounding box, that is, the C phase detects the current and applies a positive directional high-frequency pulse signal, and all the wiring of the phase sequence measurement unit host device remains unchanged, such as Figure 3 In the waveform display of ③, the display shows that channel T3 is a positive direction waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T3 is C phase, and this connection line is connected to the C phase cable, so the purpose of checking or calibrating the C phase is achieved;

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

[0097] In an optional embodiment, the directional pulse coupling slave device remains unchanged in the direct-connected grounding box, the signal injection transformer T0 and the detection current transformer TM are connected to the A phase of the direct-connected grounding box, that is, the A phase detects the current and applies a positive directional high-frequency pulse signal, and the phase sequence measurement unit master device is moved to the 3# cross-connection box and connected according to the 2# cross-connection box core phase. Figure 3 In the waveform display of ④, the display shows that channel T6 is a positive direction waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T6 is C phase, and this connection line is connected to the C phase cable, so the purpose of checking or calibrating the C phase is achieved;

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

[0099] In an optional embodiment, the directional pulse coupling slave device remains unchanged in the direct-connected ground box, and the signal injection transformer T0 and the detection current transformer TM are connected to the B phase of the direct-connected ground box, that is, the B phase detects the current and applies a positive directional high-frequency pulse signal. Figure 3 In the waveform display of ⑤, the display shows that channel T4 is a positive direction waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T4 is phase A, and this connection line is connected to the A phase cable, so as to achieve the purpose of checking or calibrating the A phase;

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

[0101] In an optional embodiment, the directional pulse coupling slave device remains unchanged in the direct-connected ground box, and the signal injection transformer T0 and the detection current transformer TM are connected to the C phase of the direct-connected ground box, that is, the C phase detects the current and applies a positive directional high-frequency pulse signal. Figure 3 In the waveform display of ⑥, the display shows that channel T5 is a positive direction waveform signal, then the phase sequence of the cable metal shield (sheath) connection line connected to T5 is phase B, and this connection line is connected to the B-phase cable, so as to achieve the purpose of checking or calibrating the B-phase;

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

[0103] It should be noted that obtaining the first verification waveform and the second verification waveform based on the first phase sequence detection framework can provide an accurate waveform verification diagram, thereby providing an intuitive reference for the phase verification operation. In this way, the operator can clearly identify the phase sequence status of the cable line to ensure the accuracy of each step of the operation. In addition, the method also allows phase verification when the cable is energized, which greatly improves work efficiency while reducing the potential impact on the stability of the power supply system. In practical applications, this technology is not only suitable 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 the power system.

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

[0105] S104, judging the live core phase of the cable cross-connection system according to the first checking waveform, the second checking waveform, the first detection waveform and the second detection waveform.

[0106] In the embodiment of the present application, judging the live core phase of the cable cross-connection system according to the first checking waveform, the second checking waveform, the first detection waveform and the second detection waveform includes:

[0107] Performing a first charged core phase judgment on the first detection waveform based on the first verification waveform;

[0108] Performing a second charged core phase judgment on the first detection waveform based on the second verification waveform;

[0109] According to the judgment results of the first charged core phase judgment and the second charged core phase judgment, the charged core phase judgment of the cross-connected group is performed.

[0110] In the embodiment of the present application, judging the live core phase of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform, and the second detection waveform further includes:

[0111] Conducting live core phase judgment on all cross-connected groups in the first phase sequence detection framework;

[0112] Complete the live phase verification of the cable cross-connection system to be tested based on the live phase verification judgment results.

[0113] In an optional embodiment, after obtaining the correct phase sequence of the three phases A, B, and C of the 2# cross-connection box, that is, after obtaining the first verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the A phase of the direct-connected grounding box, that is, the A phase is detecting the current and applying a positive directional high-frequency pulse signal, and the A, B, and C three-phase waveforms of the display, that is, the first detection waveform, are observed to see if they meet the requirements. Figure 3 If the waveform in ① is correct, it means the internal wiring of the first-level cross-connection box is correct. Otherwise, open the cover of the cross-connection box, correct the internal wiring and proceed to the next step of testing.

[0114] In an optional embodiment, after obtaining the correct phase sequence of the three phases A, B, and C of the 2# cross-connection box, that is, after obtaining the first verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the B phase of the direct-connected grounding box, that is, the B phase is detecting the current and applying a positive directional high-frequency pulse signal, and the A, B, and C three-phase waveforms of the display, that is, the first detection waveform, are observed to see if they meet the requirements. Figure 3 If the waveform in ② is correct, it means the internal wiring of the first-level cross-connection box is correct. Otherwise, open the cover of the cross-connection box, correct the internal wiring and proceed to the next step of testing.

[0115] In an optional embodiment, after obtaining the correct phase sequence of the three phases A, B, and C of the 2# cross-connection box, that is, after obtaining the first verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the A phase of the direct-connected grounding box, that is, the C phase. When detecting the current and applying a positive directional high-frequency pulse signal, observe the A, B, and C three-phase waveforms of the display, that is, the first detection waveform, to see if they meet the requirements. Figure 3 If the waveform in ③ is correct, it means the internal wiring of the first-level cross-connection box is correct. Otherwise, open the cover of the cross-connection box, correct the internal wiring and proceed to the next step of testing.

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

[0117] In an optional embodiment, after obtaining the correct phase sequence of the three phases A, B, and C of the 3# cross-connection box, that is, obtaining the second verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the A phase of the direct-connected grounding box, that is, the A phase is detecting the current and applying a positive directional high-frequency pulse signal, and the A, B, and C three-phase waveforms of the display, that is, the second detection waveform, are observed to see if they meet the requirements. Figure 3 If the waveform in ④ is correct, it means the internal wiring of 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 the three phases A, B, and C of the 3# cross-connection box, that is, obtaining the second verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the A phase of the direct-connected grounding box, that is, the B phase is detecting the current and applying a positive directional high-frequency pulse signal, and the A, B, and C three-phase waveforms of the display, that is, the first detection waveform, are observed to see if they meet the requirements. Figure 3 If the waveform in ⑤ is correct, it means the internal wiring of 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 the three phases A, B, and C of the 3# cross-connection box, that is, obtaining the second verification waveform, the signal is re-injected into the transformer T0 and the detection current transformer TM is connected to the A phase of the direct-connected grounding box, that is, the C phase. When detecting the current and applying a positive directional high-frequency pulse signal, observe the A, B, and C three-phase waveforms of the display, that is, the first detection waveform, to see if they meet the requirements. Figure 3 If the waveform in ⑥ is correct, it means the internal wiring of 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 waveform judgment process for different phases in the second detection waveform is the second charged core phase judgment.

[0121] In an optional embodiment, if the waveforms do not match, it may be that the phase sequence is connected incorrectly, the inner and outer cores of the same phase are connected incorrectly or short-circuited in the cross-connection box. The above operation can be used to determine which phase is faulty, providing a basis for further fault diagnosis and repair.

[0122] In an optional embodiment, after waiting for both cross-connection boxes in the cross-connection group to complete the judgment, the slave device with directional pulse coupling is installed in the next-level direct-connection grounding box, and the operation is repeated to check whether the phase sequence of the subsequent cross-connection boxes corresponds and whether the internal wiring is correct.

[0123] In an optional embodiment, if Figure 3As shown in the figure, the correct waveforms displayed on the color display of the main device of the phase sequence measurement unit, among which waveforms ①, ②, and ③ are the waveforms detected by the Rogowski coils of the 2# cross-connection box T1, T2, and T3, which correspond to the correct waveforms when the A, B, and C phase socket signals of the grounding box are injected into the mutual inductor; waveforms ④, ⑤, and ⑥ are the waveforms detected by the Rogowski coils of the 3# cross-connection box T4, T5, and T6, which correspond to the correct waveforms when the A, B, and C phase socket signals of the grounding box are injected into the mutual inductor. The high-frequency pulse signal waveforms in the positive direction of these waveforms reflect that the phase sequence of the Rogowski coil socket corresponding to this waveform is consistent with the phase sequence of the signal injected into the mutual inductor socket, so as to achieve the purpose of phase verification. When testing the 2# cross-connection box, determine whether the cross-connection wiring inside the 2# cross-connection box is correct based on the waveform diagrams of T1, T2, and T3; when testing the 3# cross-connection box, determine whether the cross-connection wiring inside the 3# cross-connection box is correct based on the waveform diagrams of T4, T5, and T6. Moreover, these operations can be performed when the cable is energized, ultimately achieving the goal of energized phase sequence verification of the entire cross-connection box.

[0124] In an optional embodiment, the metal shield (sheath) of the cable and the earth can be used to form distributed parameters. When a directional high-frequency pulse signal is transmitted along the earth in the metal shield (sheath) of the cable, a directional pulse coupling device and a measuring unit device are installed on the grounding wire of the direct-connected grounding box and the cross-connected grounding box respectively; the coupling device injects a positive directional high-frequency pulse signal at the zero point of a phase loop current of the grounding wire of the direct-connected grounding box, and the high-frequency pulse signal is transmitted along the metal shield (sheath) of the cable to reach the cross-connected box. The phase sequence measurement unit is installed on the three-phase cable metal shield (sheath) connecting line of the cross-connected box. After the signal is sensed by the Rogowski coil, it is filtered, amplified, and smoothed and sent to the high-speed sampling circuit. The high-speed AD converts the analog signal into a digital signal. The processor divides the three-phase digital signal waveform into three colors of yellow, green, and red and draws it on a color display screen. The channel displaying the positive direction waveform signal is the metal shield (sheath) of the same phase cable, thereby achieving the core phase purpose of the cross-connected box. On the basis of the correct phase identification of the cross-connection box, the logical correspondence between the three-phase waveform and the known waveform can be compared to further identify whether the cross-connection wiring inside the cross-connection box is correct. The present invention can verify the external correct phase sequence relationship of the cross-connection box, and further identify the accuracy of the cross-connection wiring inside the cross-connection box, thereby improving the work efficiency and power supply reliability of power operation and maintenance personnel and saving manpower and material resources.

[0125] In summary, the present invention proposes a method for live phase verification of a cable cross-connection system, establishing a first phase sequence detection framework based on the cable to be tested; obtaining a first verification waveform and a second verification waveform based on the first phase sequence detection framework; obtaining a first detection waveform and a second detection waveform based on the first phase sequence detection framework; and performing live phase verification judgment of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform. It is capable of verifying the correct external phase sequence relationship of the cross-connection box, and further identifying the accuracy of the cross-connection wiring inside the cross-connection box, thereby improving the work efficiency and power supply reliability of power operation and maintenance personnel, and saving manpower and material resources. The present application can verify whether the phase sequence of the cross-connection box is wired according to the regulations under live conditions, and whether the cross-connection wiring inside the cross-connection box is correct without opening the cover, thereby ensuring the accuracy and reliability of the test under any high current conditions. This solves the problem that the test can only be carried out under low current conditions less than 30A and the cover needs to be opened for inspection. It can quickly verify the wiring phase sequence of the cross-connection box and determine whether the internal cross-connection wiring is correct, thereby improving the work efficiency and power supply reliability of power operation and maintenance personnel, saving a lot of manpower and material resources, reducing power outage time, and reducing the labor intensity of operation and maintenance personnel. The advantage provided by this application is that it can be operated live under high current conditions, and it is possible to know whether the internal cross-connection wiring of the cross-connection box is correct without opening the cover. It can be operated and measured under various complex working conditions, and the measurement preparation is reliable, fast, light, and easy to carry. It has significant social and economic benefits.

[0126] Example 2

[0127] This embodiment also provides a preferred configuration of a positive directional pulse coupling slave device. Figure 4 As shown, the positive directional pulse coupling slave device includes a circulating current detection circuit, a square wave forming zero-crossing detection circuit, a timing combination circuit, a positive direction high-frequency pulse output module, a lithium battery power supply circuit, an MCU processing module, and a boost energy storage circuit. The lithium battery is the power supply for the entire device. At the zero-crossing moment of the circulating current, the MCU processing module couples the positive direction high-frequency pulse signal to the cable metal shield (sheath) grounding wire through the timing combination circuit and the signal injection transformer, and the boost energy storage circuit provides a 400V high-voltage power supply for the positive direction high-frequency pulse output module.

[0128] like Figure 5As shown, the main device of the phase sequence measurement 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 working power for the main unit. The Rogowski coil in the high-frequency detection circuit is sleeved on the three-phase cable metal shield (sheath) connection line of the cross-connection box to sense the 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 the threshold value set by it, 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, and the noise components in the analog signal are filtered out by digital filtering. 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 showing the positive direction waveform signal is the cable metal shield (sheath) of the same phase as the ground wire of the coupling transformer sleeve of the directional pulse coupling slave device, so as to achieve the purpose of the cross-connection box core phase, that is, the three-phase cable metal shield (sheath) connection lines A, B, and C are calibrated.

[0129] like Figure 6 The following are program logic block diagrams of the MCU processing circuits in the positive directional pulse coupling slave device and the phase sequence measurement unit host device, respectively. After the positive directional pulse coupling slave device is powered on and initialized, it detects the rising edge of the circulating square wave. After detecting the rising edge, it delays 7ms to start the positive direction high frequency pulse output instruction. After outputting the instruction, it delays 30s and re-detects the rising edge of the circulating square wave. This cycle repeats for 30s.

[0130] After the main unit of the phase sequence measurement unit is powered on and initialized, it starts the high-speed AD sampling in a cycle, and after digital filtering and graph drawing, it identifies which channel is the positive directional pulse signal while drawing the graph, and determines that this channel is the same phase sequence signal, then delays for 10 seconds, clears the waveform, and prepares for the next positive high-frequency pulse signal. The cycle is repeated for 10 seconds.

[0131] Figure 7 This is a circuit diagram of an isolation amplifier and a filtering steepening circuit, whose main functions are to filter out low-frequency signals and amplify, filter and steepen high-frequency signals. Figure 7 T1 is a high-frequency pulse current transformer, which receives the output signal of the Rogowski coil, isolates the low-frequency signal, separates the strong and weak current, and has a steepening effect because it responds to dI / dt. U1 is a voltage follower, which improves the signal input impedance and load capacity. The signal is amplified by U2, and C2 removes the DC component and passes the high-frequency component. T2 is a pulse voltage transformer, which responds to dU / dt. On the basis of the steepening of T1, it further steepens the signal and further isolates the low-frequency clutter signal.

[0132] Figure 8The circuit diagram of the trigger circuit detects the arrival time of the positive high-frequency pulse signal and whether the energy storage capacitor voltage of the 400V boost energy storage circuit reaches 400V. The voltage divider circuits of R3, R4 and R5, R6 provide the threshold voltage of the comparator respectively, U1B responds to the positive pulse signal, and U1A responds to the negative pulse signal, respectively detecting the positive pulse signal and the reverse pulse signal. When the positive and negative pulses exceed the threshold, the comparator flips and starts high-speed AD sampling. Resistor R9 is a sampling resistor of 400V voltage. When the voltage reaches 400V, U3B outputs a high level, and U4A improves the quality of the signal.

[0133] Fig. 9 This is the circuit diagram of the timing combination circuit. When the high-frequency pulse signal in the positive direction is coupled to the cable metal shield (sheath) grounding wire through the signal injection transformer, K1 and K2 act respectively, and the high-voltage pulse output module injects the high-frequency pulse signal into the cable. After the signal detection circuit detects the S1 signal, it starts the delay loop and the counter starts counting. When the preset time is reached, K1 and K2 return to provide a path for the S2 signal to ensure that the detection circuit can detect the S2 signal.

[0134] like Fig.10 This is the circuit diagram of the high-voltage pulse output module circuit. 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 acts to connect the circuit, Q1 acts, and a high-voltage pulse signal is injected into the cable. R2 limits the charging current and charging time, and R1 and C1 control the amplification time.

[0135] like Fig.11 This is the circuit diagram of the MCU processing module. This circuit is the common core processing hardware part of the positive directional pulse coupling slave device and the phase sequence measurement unit host device. Different devices execute different applications and run different logic processes. Among them, U1 is the core processor, U2 is a large-capacity SDRAM, and U3 is FLASH.

[0136] like Fig.12 This is the circuit diagram of 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, variable resistor R16, and capacitor C2 form an oscillation circuit. Q1 and Q2 push-pull outputs drive Q3 to provide high-frequency square wave power for T1. T1 is a boost transformer. By adjusting R15 and R16, U1 outputs different oscillation frequencies, so that the output voltage of T1 reaches 500V, and the 12V voltage is boosted to 400V. This 400V voltage charges the high-voltage energy storage capacitor C3. P1 provides working power to U1 and each drive circuit. R8 provides a discharge circuit for C1 when the device is turned off to avoid accidental electric shock.

[0137] like Fig.13This is the circuit diagram of the lithium battery and power supply circuit. This circuit provides the basic voltage for each functional circuit, and outputs the 12V voltage of the lithium battery as 3.3V, ±5V, and 24V respectively. Among them, P1 outputs 3.3 to provide power for the core processor, logic circuit CPLD, and storage chip; P2 outputs 24V to provide power for the relay; P3 and P4 together form a ±5V power supply to provide energy for the operational amplifier.

[0138] Example 3

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

[0140] A framework establishment module, used for establishing a first phase sequence detection framework based on the cable to be tested;

[0141] A verification waveform acquisition module, used to acquire a first verification waveform and a second verification waveform based on a first phase sequence detection framework;

[0142] A detection waveform acquisition module, used to acquire a first detection waveform and a second detection waveform based on a first phase sequence detection framework;

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

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

[0145] This embodiment also provides a computer device, which may be a terminal, and its internal structure diagram may be as shown in FIG. Fig.14As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for electrically controlling the phase of a cable cross-connection system is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0146] This embodiment further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0147] Establishing a first phase sequence detection framework based on the cable to be tested;

[0148] Acquire a first verification waveform and a second verification waveform based on a first phase sequence detection framework;

[0149] Acquire a first detection waveform and a second detection waveform based on a first phase sequence detection framework;

[0150] The live core phase judgment of the cable cross-connection system is performed according to 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 rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0152] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt 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.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0153] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0154] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0155] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0156] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0157] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for checking the phase of a cable cross-connection system under power-on conditions, characterized in that: include: Establishing a first phase sequence detection framework based on the cable to be tested; Acquire a first verification waveform and a second verification waveform based on the first phase sequence detection framework; Acquire a first detection waveform and a second detection waveform based on the first phase sequence detection framework; The live core phase judgment of the cable cross-connection system is performed according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform.

2. The method for checking the phase of a cable cross-connection system under power supply as claimed in claim 1, characterized in that: The acquiring of the first verification waveform and the second verification waveform based on the first phase sequence detection framework comprises: The first phase sequence detection framework includes a plurality of cross-connection groups, and the cross-connection groups include a first cross-connection box and a second cross-connection box; The first verification waveform is a correct phase sequence waveform of the first cross-connection box; The second verification waveform is a correct phase sequence waveform of the second cross-connection box.

3. The method for checking the phase of a cable cross-connection system under power supply as claimed in claim 2, characterized in that: The performing of live phase determination of the cable cross-connection system according to the first verification waveform, the second verification waveform, the first detection waveform and the second detection waveform comprises: Performing a first charged core phase judgment on the first detection waveform based on the first verification waveform; Performing a second charged core phase judgment on the first detection waveform based on the second verification waveform; According to the judgment results of the first charged core phase judgment and the second charged core phase judgment, the charged core phase judgment of the cross-connected group is performed.

4. The method for checking the phase of a cable cross-connection system under power-on condition as claimed in claim 3, characterized in that: The performing of live core phase judgment of the cable cross-connection system according to the first checking waveform, the second checking waveform, the first detection waveform and the second detection waveform further comprises: Performing live core phase judgment on all cross-connected groups in the first phase sequence detection framework; Complete the live phase verification of the cable cross-connection system to be tested based on the live phase verification judgment results.

5. The method for checking the phase of a cable cross-connection system under power-on condition as claimed in claim 4, characterized in that: The establishing of a first phase sequence detection framework based on the cable to be tested comprises: The first phase sequence detection framework also includes a plurality of directional pulse coupling slave devices and a plurality of phase sequence measurement unit host devices; The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal of a set direction into the metal shielding layer grounding wire of a certain phase cable of the direct-connected grounding box; The phase sequence measurement unit host device is used to detect the positive high-frequency pulse signal injected by the cable terminal.

6. The method for checking the phase of a cable cross-connection system under power-on condition as claimed in claim 5, characterized in that: The directional pulse coupling slave device is used to inject a positive high-frequency pulse signal of a set direction into the metal shielding layer grounding wire of a certain phase cable of the direct-connected grounding box, and includes: The directional pulse coupling slave device detects the current of the phase-to-ground wire and injects a positive high-frequency pulse signal of a set direction at the zero-crossing point of the current.

7. The method for checking the phase of a cable cross-connection system under power-on condition as claimed in claim 6, characterized in that: The correct phase sequence waveform includes three correct waveforms of different phases.

8. A cable cross-connection system with live core phase system, characterized in that: include: A framework establishment module, used for establishing a first phase sequence detection framework based on the cable to be tested; A verification waveform acquisition module, used to acquire a first verification waveform and a second verification waveform based on the first phase sequence detection framework; A detection waveform acquisition module, 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 live core phase of the cable cross-connection system according to 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, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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

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