Component separation calculation method, system and device for high-voltage alternating current submarine cable grounding current and medium

Abstract

The application discloses a kind of high-voltage alternating current submarine cable grounding current component separation calculation method, system, equipment and medium.The component separation calculation method of the application includes: in the high-voltage alternating current submarine cable body of first and last end of field, metal sheath ground wire and armoring ground wire are all equipped with current transformer;Current monitoring quantity flowing through current transformer is obtained;Vector calculation is carried out to current monitoring quantity, and the cable core current vector of first and last end, metal sheath grounding current vector and armoring layer grounding current vector are obtained;Vector calculation is carried out to current vector, and the capacitive current component and electromagnetic induction current component of metal sheath grounding current and armoring grounding current are obtained, further combined with cable core current vector, and the capacitive current leakage proportionality coefficient of metal sheath and armoring and grounding loop electromagnetic induction current proportionality coefficient are calculated, to monitor the grounding loop state of cable metal sheath, armoring whole line, and cable main insulation, sheath outer insulation state.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of power grid transmission and distribution, and relates to calculation of high-voltage alternating current submarine cable grounding current, in particular to a component separation calculation method, system, device and medium for high-voltage alternating current submarine cable grounding current. BACKGROUND

[0002] With the gradual increase of urban power consumption in recent years, the power transmission mode of high-voltage cables as the main part and overhead lines as the auxiliary part has gradually formed in urban centers. Overhead lines are prone to be affected by extreme weather during operation, and lightning strikes on lines may cause lightning current to invade the lines. Cable lines connected with overhead lines also have the risk of being invaded by lightning current.

[0003] Because the time of lightning strike is in the microsecond level, the existing online monitoring device has very limited means for monitoring the running state of the high-voltage submarine cable during operation. Only the amplitude of the grounding current is used to determine whether the submarine cable is in a normal running state, and there is no more monitoring angle. SUMMARY

[0004] The technical problem to be solved by the application is to overcome the defects of the prior art, and to provide a component separation calculation method, system, device and medium for high-voltage alternating current submarine cable grounding current. The current transformers are added to the submarine cable body, the metal sheath grounding wire and the armored grounding wire at the first and last ends of the submarine cable on site, the corresponding current monitoring values are obtained, the capacitive current and the inductive current in the grounding current are separated by vector calculation, and the capacitive current leakage proportion coefficient and the grounding loop electromagnetic induction current proportion coefficient are further calculated to monitor the grounding loop state of the submarine cable metal sheath and armored wire and the main insulation and sheath outer insulation state of the submarine cable.

[0005] To this end, the application adopts the following technical solutions.

[0006] In a first aspect, the application provides a component separation calculation method for high-voltage alternating current submarine cable grounding current, which comprises:

[0007] Obtaining current monitoring values flowing through current transformers, the current transformers being added to the submarine cable body, the metal sheath grounding wire and the armored grounding wire at the first and last ends of the high-voltage alternating current submarine cable;

[0008] Performing vector calculation on the current monitoring values to obtain submarine cable core current vectors, metal sheath grounding current vectors and armored layer grounding current vectors at the first and last ends;

[0009] Performing vector calculation on the current vectors to obtain capacitive current components and electromagnetic induction current components of the metal sheath grounding current and the armored grounding current;

[0010] The capacitive current component and the electromagnetic induction current component are combined with the cable core current vector to calculate the capacitive current leakage proportion coefficient of the metal sheath and the armored cable and the electromagnetic induction current proportion coefficient of the grounding loop.

[0011] Further, when the current transformer is installed, the positive direction of the current sensor installed at the first end and the last end of the submarine cable body is horizontally to both sides of the central part of the submarine cable body.

[0012] Further, when the current transformer is installed, the positive direction of the current sensor installed at the first end and the last end of the submarine cable body is horizontally to both sides of the central part of the submarine cable body.

[0013] Further, when the current transformer is installed, the positive direction of the current sensor installed at the first end and the last end of the submarine cable body is horizontally to both sides of the central part of the submarine cable body.

[0014] Further, the formula for vector calculation of the current monitoring quantity is as follows:

[0015] ,

[0016] Wherein, A 1 is the current monitoring quantity of the current sensor at the first end of the submarine cable body; A 2 is the current monitoring quantity of the current sensor at the first end of the metal sheath grounding line; A 3 is the current monitoring quantity of the current sensor at the first end of the armored grounding line; A 4 is the current monitoring quantity of the current sensor at the last end of the submarine cable body; A 5 is the current monitoring quantity of the current sensor at the last end of the metal sheath grounding line; A 6 is the current monitoring quantity of the current sensor at the last end of the armored grounding line; I 1 is the core current flowing into the submarine cable body at the first end of the submarine cable, and the positive direction is horizontally towards the central part of the submarine cable; I 2 is the current flowing out of the metal sheath grounding line at the first end of the submarine cable, and the positive direction is vertically downward towards the grounding point of the metal sheath; I 3 is the current flowing out of the armored grounding line at the first end of the submarine cable, and the positive direction is vertically downward towards the grounding point of the armored cable; I 4 is the core current flowing into the submarine cable body at the last end of the submarine cable, and the positive direction is horizontally towards the central part of the submarine cable; I 5 is the current flowing out of the metal sheath grounding line at the last end of the submarine cable, and the positive direction is vertically downward towards the grounding point of the metal sheath; I 6 is the current flowing out of the armored grounding line at the last end of the submarine cable, and the positive direction is vertically downward towards the grounding point of the armored cable.

[0017] Further, the formula for vector calculation of the current vector is as follows:

[0018] ,

[0019] wherein, I s_c is the capacitive current component in the metal sheath grounding current; I a_c is the capacitive current component in the armor grounding current; I s_dcgy is the electromagnetic induction current component in the metal sheath grounding current; I a_dcgy is the electromagnetic induction current component in the armor grounding current.

[0020] Further, the capacitive current leakage proportionality coefficient of the metal sheath and the armor and the grounding loop electromagnetic induction current proportionality coefficient are calculated by the following formula:

[0021] ,

[0022] wherein, k c_s is the capacitive current leakage proportionality coefficient of the metal sheath; k c_a is the capacitive current leakage proportionality coefficient of the armor, k g_s is the grounding loop electromagnetic induction current proportionality coefficient of the metal sheath; k g_a is the grounding loop electromagnetic induction current proportionality coefficient of the armor.

[0023] In a second aspect, the present application provides a component separation calculation system for high-voltage AC submarine cable grounding current, which is used to realize the component separation calculation method of the high-voltage AC submarine cable grounding current, and comprises:

[0024] A current transformer installation unit is used to obtain current monitoring quantities flowing through the current transformer, which is installed on the submarine cable body, the metal sheath grounding wire and the armor grounding wire at the two ends of the high-voltage AC submarine cable;

[0025] A current monitoring quantity acquisition unit is used to obtain current monitoring quantities flowing through the current transformer;

[0026] A current vector calculation unit is used to perform vector calculation on the current monitoring quantities to obtain the submarine cable core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at the two ends;

[0027] A current component calculation unit is used to perform vector calculation on the current vector to obtain the capacitive current component and the electromagnetic induction current component of the metal sheath grounding current and the armor grounding current;

[0028] The proportion coefficient calculation unit combines the capacitive current component and the electromagnetic induction current component with the cable core current vector to calculate the capacitive current leakage proportion coefficient of the metal sheath and the armor and the electromagnetic induction current proportion coefficient of the grounding loop.

[0029] In a third aspect, the present application provides a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the component separation calculation method when executing the computer program.

[0030] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program is executable on a processor to implement the steps of the component separation calculation method.

[0031] Compared with the prior art, the present application installs current transformers on the cable body, the metal sheath grounding wire and the armor grounding wire of the high-voltage alternating current submarine cable in the field operation, separates the capacitive current and the inductive current in the grounding current through vector calculation, further calculates the capacitive current leakage proportion coefficient and the electromagnetic induction current proportion coefficient of the grounding loop, thereby monitoring the grounding loop state of the metal sheath and the armor of the submarine cable and the main insulation and the outer insulation of the sheath, providing support for the online monitoring of the submarine cable operation and maintenance strategy and scheduling data, and providing a theoretical basis for the subsequent offshore wind power grid connection design via high-voltage alternating current submarine cables. BRIEF DESCRIPTION OF DRAWINGS

[0032] To make the technical solutions of the present application or the prior art clearer, the accompanying drawings needed in the specific implementation manner or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort.

[0033] Figure 1 Flowchart of the component separation calculation method of the grounding current of the high-voltage alternating current submarine cable of the present application;

[0034] Figure 2 Schematic diagram of the installation position of the current sensor of the cable body, the metal sheath grounding wire and the armor grounding wire of the cable at the first end and the last end in the specific implementation manner of the present application;

[0035] Figure 3 Structural diagram of the cable in the specific implementation manner of the present application;

[0036] Figure 4 Simplified equivalent circuit diagram of the cable in the specific implementation manner of the present application;

[0037] Figure 5A cable capacitance current distribution diagram in the specific embodiment of the present application;

[0038] Figure 6 An electromagnetic induction current equivalent circuit diagram of a submarine cable in the specific embodiment of the present application;

[0039] Figure 7 A corresponding vector diagram of each electrical quantity of a submarine cable in the specific embodiment of the present application;

[0040] Figure 8 A composition diagram of a component separation calculation system of a high-voltage alternating current submarine cable grounding current;

[0041] Figure 9 A logical structure schematic diagram of a computer device provided by an embodiment of the present application;

[0042] Figure 3 In the specific embodiment, 1-conductor, 2-semi-conductive tape, 3-XPLE insulation layer, 4-insulation shielding layer, 5-metal sheath, 6-sheath insulation layer, 7-armor layer, and 8-outer covering layer. Specific embodiment

[0043] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0044] Embodiment 1

[0045] The present embodiment is a component separation calculation method of a high-voltage alternating current submarine cable grounding current, as shown in Figure 1 , and the steps are as follows:

[0046] a) Install current transformers on the submarine cable body, metal sheath grounding wire and armor grounding wire at the first and last ends of the on-site high-voltage alternating current submarine cable, a total of 6 current transformers;

[0047] b) Obtain the current monitoring quantities of the 6 current transformers on the submarine cable body, metal sheath grounding wire and armor grounding wire at the first and last ends;

[0048] c) Perform vector calculation on the 6 current detection quantities obtained in step b) to obtain the submarine cable core current vector, metal sheath grounding current vector and armor layer grounding current vector at the first and last ends;

[0049] d) Obtain the capacitance current component and electromagnetic induction component of the metal sheath and armor through vector calculation, respectively, from the 6 current vectors calculated in step c);

[0050] e) the proportionality coefficient of the capacitive current leakage of the metal sheath and the proportionality coefficient of the electromagnetic induction current of the grounding loop are calculated by combining the cable core current vector in step c) with the capacitive current component and the electromagnetic induction component in step d), thereby completing the component separation calculation method of the grounding current of the submarine cable.

[0051] Specifically, in step a), the installation of the 6 current sensors is performed by the following steps:

[0052] a1) the positive direction of the installation of the current sensors at the first and last ends of the submarine cable body is respectively horizontal to both sides of the positive center of the submarine cable;

[0053] a2) the positive direction of the installation of the current sensors at the metal sheath grounding line of the first and last ends of the submarine cable is vertically upward at the metal sheath grounding point;

[0054] a3) the positive direction of the installation of the current sensors at the armor grounding line of the first and last ends of the submarine cable is vertically upward at the armor grounding point.

[0055] Specifically, in step b), the current monitoring quantities of the 6 current transformers are as follows: the current monitoring quantity of the current sensor at the first end of the submarine cable body is denoted as A 1; the current monitoring quantity of the current sensor at the first end of the metal sheath grounding line is denoted as A 2; the current monitoring quantity of the current sensor at the first end of the armor grounding line is denoted as A 3; the current monitoring quantity of the current sensor at the last end of the submarine cable body is denoted as A 4; the current monitoring quantity of the current sensor at the last end of the metal sheath grounding line is denoted as A 5; and the current monitoring quantity of the current sensor at the last end of the armor grounding line is denoted as A 6.

[0056] Specifically, in step c), the cable core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at the first and last ends are obtained by the following steps:

[0057] c1) the 6 current detection quantities A 1 to A 6 obtained in step b) are acquired;

[0058] c2) according to A 1 to A 6, the cable core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at the first and last ends are calculated by vector calculation, and the calculation formula is as follows:

[0059]

[0060] wherein, I 1 is the cable core current flowing into the submarine cable body at the first end of the submarine cable, and the positive direction is horizontal toward the positive center of the submarine cable;I 2 is the current flowing out of the metal sheath grounding wire at the submarine cable head end, the positive direction being perpendicular downward toward the metal sheath grounding point; I 3 is the current flowing out of the armor grounding wire at the submarine cable head end, the positive direction being perpendicular downward toward the armor grounding point; I 4 is the core current flowing into the submarine cable body at the submarine cable tail end, the positive direction being horizontal toward the central part of the submarine cable; I 5 is the current flowing out of the metal sheath grounding wire at the submarine cable tail end, the positive direction being perpendicular downward toward the metal sheath grounding point; I 6 is the current flowing out of the armor grounding wire at the submarine cable tail end, the positive direction being perpendicular downward toward the armor grounding point.

[0061] Specifically, in step d), the six current vectors calculated in step c) are subjected to vector calculation to obtain the capacitive current components and the electromagnetic induction components of the metal sheath and the armor, respectively; and the following steps are taken to obtain:

[0062] d1) obtaining the six current vectors I1 to I6 calculated in step c);

[0063] d2) performing vector calculation according to I1 to I6 to obtain the capacitive current components and the electromagnetic induction components of the metal sheath and the armor, the calculation formulae being as follows:

[0064]

[0065] wherein, I s_c is the capacitive current component in the metal sheath grounding current; I a_c is the capacitive current component in the armor grounding current; I s_dcgy is the electromagnetic induction current component in the metal sheath grounding current; I a_dcgy is the electromagnetic induction current component in the armor grounding current.

[0066] The specific steps of step e) are as follows:

[0067] e1) obtaining the capacitive current components and the electromagnetic induction components in step d) I s_c , I a_c , I s_dcgy , I a_dcgy ;

[0068] e2) obtaining the core current vectors I1 and I4 in step c);

[0069] e3) according to I s_c ,I a_c 、 I s_dcgy 、 I a_dcgy and I1, I4, the cable metal sheath, the proportion of the armor of the capacitive current leakage coefficient and the ground loop electromagnetic induction current proportion coefficient, the calculation formula is as follows:

[0070]

[0071] Wherein, k c_s The proportion of the capacitive current leakage coefficient of the metal sheath; k c_a The proportion of the capacitive current leakage coefficient of the armor, k g_s The proportion of the capacitive current leakage coefficient of the metal sheath; k g_a The proportion of the capacitive current leakage coefficient of the armor.

[0072] Taking a 500kV typical single-core submarine cable in actual operation as an example, the following application of the component separation calculation method is used to separate and calculate the submarine current grounding current, and the specific steps are as follows:

[0073] a) Install current transformers at the submarine cable body, sheath grounding wire and armor grounding wire at the first and last ends of the field high-voltage alternating current submarine cable, a total of 6 current transformers, as shown in Figure 2 ; the submarine cable model is HYJQ71-F290 / 500kV 1x1800mm 2 , and the submarine cable sectional view is shown in Figure 3 ;

[0074] b) Obtain the current monitoring values of the 6 current transformers of the submarine cable body, sheath grounding wire and armor grounding wire at the first and last ends, respectively recorded as A 1 to A 6, whose values are respectively: A 1=939.7+664.6i ampere, A 2=235A∠113.5°, A 3=803.1A∠180.3°, A 4=-129.8-804.8 ampere, A 5=88.6A∠66.5°, A 6=802.9A∠0.3°;

[0075] c) Vector calculation is performed on the 6 current detection values obtained in step b) to obtain the submarine cable core current vector at the first and last ends, the metal sheath grounding current vector, and the armor layer grounding current vector, which are brought into calculation to obtain: I1= = 886.9 A ∠ 0°, I2= = 235 A ∠ 113.5°, I3= = 803.1 A ∠ 180.3°, I4= = 830 A ∠ 175.1°, I5= = 88.6 A ∠ 66.5°, and I6= = 802.9 A ∠ 0.3°; the submarine cable simplified equivalent circuit diagram is shown in Figure 4 , Figure 4 , I c represents the capacitive leakage current of the unit length of the submarine cable, A; M , N , G respectively represent the metal sheaths at the first end, the last end, and the midpoint of the submarine cable; C represents the capacitance of the unit length of the submarine cable, F; represents the total length of the submarine cable, km;

[0076] d) The 6 current vectors calculated in step c) are obtained, and the capacitive current component and the electromagnetic induction component of the metal sheath and the armor are obtained through vector calculation, which are brought into calculation to obtain: I s_c = = 316.1 A ∠ 90°, I a_c = = 2.5 A ∠ 90°, I s_dcgy = = 81.0 A ∠ 90°, I a_dcgy = = 803.0 A ∠ 90°; the submarine cable capacitive current distribution is shown in Figure 5 , and each parameter meets the following formula:

[0077]

[0078] In the formula, R s , X s , R a , X a respectively represent the resistance and self-induction of the metal sheath and the armor, I si , Iai respectively are the electromagnetic induction current through the i-th phase metal sheath, i = A, B, C; R e is the equivalent leakage resistance of the earth; R e1 , R e2 respectively are the grounding resistances at both ends of the submarine cable line; U si , U' si, U" si respectively are the induced voltages on the i-th phase metal sheath due to the three-phase cable core current, the other two-phase metal sheath current, and the three-phase armor current; U ai , U' ai, U" ai respectively are the induced voltages on the i-th phase armor due to the three-phase cable core current, the three-phase metal sheath current, and the other two-phase armor current.

[0079] The equivalent circuit of the submarine cable electromagnetic induction current is shown in Figure 6 , is the voltage at the beginning of the submarine cable, kV; is the voltage at the end of the submarine cable, kV; is the capacitive current component of the metal sheath at the beginning of the submarine cable, kA; is the capacitive current component of the metal sheath at the end of the submarine cable, kA; is the cable core current, kA; is the load current, kA; Z is the equivalent impedance of the submarine cable, Ω; Y is the equivalent admittance of the submarine cable, S; R is the equivalent load, Ω.

[0080] The corresponding vector diagram of each electrical quantity of the submarine cable is shown in Figure 7 , is the current at the beginning of the metal sheath, kA; is the current at the end of the metal sheath, kA; is the voltage on the equivalent impedance of the submarine cable, kV.

[0081] e) Obtain the capacitive current component and the electromagnetic induction component in step d), combine the cable core current vector in step c), calculate the capacitive current leakage proportionality coefficient of the submarine cable metal sheath and armor, and the electromagnetic induction current proportionality coefficient of the grounding loop, and substitute to calculate: k c_s = = 1, k g_s = = 9.44%, k c_a = = 0.80%, k g_a = = 93.92%, thereby completing the calculation of the capacitive current leakage proportionality coefficient of the metal sheath and the armor of the submarine cable and the proportionality coefficient of the electromagnetic induction current of the grounding loop.

[0082] Embodiment 2

[0083] The embodiment provides a component separation calculation system of grounding current of high-voltage alternating-current submarine cable, which is used for realizing the component separation calculation method of grounding current of high-voltage alternating-current submarine cable in embodiment 1, as shown in the figure, which is composed of a current monitoring value acquisition unit, a current vector calculation unit, a current component calculation unit and a proportionality coefficient calculation unit. Figure 8

[0084] The current monitoring value acquisition unit is used for acquiring the current monitoring value flowing through the current transformer, and the current transformer is added to the submarine cable body, the metal sheath grounding wire and the armor grounding wire at the two ends of the high-voltage alternating-current submarine cable.

[0085] The current vector calculation unit is used for performing vector calculation on the current monitoring value to obtain the submarine cable core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at the two ends.

[0086] The current component calculation unit is used for performing vector calculation on the current vector to obtain the capacitive current component and the electromagnetic induction current component of the metal sheath grounding current and the armor grounding current.

[0087] The proportionality coefficient calculation unit combines the capacitive current component and the electromagnetic induction current component with the submarine cable core current vector to calculate the capacitive current leakage proportionality coefficient of the metal sheath and the armor and the proportionality coefficient of the electromagnetic induction current of the grounding loop.

[0088] It should be noted that each unit in the above-mentioned component separation calculation system of grounding current of high-voltage alternating-current submarine cable can be realized by software, hardware and a combination thereof in whole or in part. The above-mentioned units can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so as to call and execute the operations corresponding to the above-mentioned units by the processor. For the specific limitation of the component separation calculation system of grounding current of high-voltage alternating-current submarine cable, refer to the limitation of the component separation calculation method of grounding current of high-voltage alternating-current submarine cable (i.e. embodiment 1) in the above, both have the same functions and effects, and will not be described here.

[0089] Embodiment 3

[0090] ​This embodiment provides a computer device, including: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, which, when executed by the at least one processor, causes the electronic device to perform the method according to Embodiment 1 of the present invention.

[0091] Example 4

[0092] This embodiment provides a non-transitory computer-readable storage medium storing a computer program, wherein the computer program, when executed by a computer's processor, is used to cause the computer to perform the method according to Embodiment 1 of the present invention.

[0093] refer to Figure 9 The present invention will now be described in the form of a structural block diagram of an electronic device 400 that can serve as a server or client of the present invention, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0094] like Figure 9 As shown, the electronic device 400 includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 402 or a computer program loaded from a storage unit 408 into a random access memory (RAM) 403. The RAM 403 may also store various programs and data required for the operation of the electronic device 400. The computing unit 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0095] A plurality of components in the electronic device 400 are connected to the I / O interface 405, including: an input unit 406, an output unit 407, a storage unit 408, and a communication unit 409. The input unit 406 can be any type of device that can input information to the electronic device 400, and can receive inputted digital or character information, and generate key signal inputs related to user settings and / or function controls of the electronic device. The output unit 407 can be any type of device that can present information, and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 408 can include, but is not limited to, a magnetic disk, an optical disk. The communication unit 409 allows the electronic device 400 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth™ device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0096] The computing unit 401 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 401 performs various methods and processes described above. For example, in some embodiments, the aforementioned component separation calculation method for high-voltage AC sea cable earth currents can be implemented as a computer software program, which is tangibly embodied in a machine-readable medium, such as the storage unit 408. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 400 via the ROM 402 and / or the communication unit 409. In some embodiments, the computing unit 401 can be configured to perform the aforementioned component separation calculation method for high-voltage AC sea cable earth currents by any other appropriate means, e.g., by means of firmware.

[0097] Program code for carrying out the methods of the present application can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces the functions / operations specified in the flowcharts and / or the block diagrams. The program code can be embodied on the machine, partially, entirely, as a stand-alone software package, partially on the machine and partially on a remote machine or entirely on a remote machine or server.

[0098] In the context of the present application, a machine-readable medium can be a tangible medium that can contain or store program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable storage medium can include, but are not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the foregoing.

[0099] As used in the present application, the terms "machine-readable medium" and "computer- readable medium" refer to any computer program product, apparatus and / or device (e.g., magnetic discs, optical disks, memory, Programmable Logic Devices (PLDs)) used to provide machine instructions and / or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal that can be used to provide machine instructions and / or data to a programmable processor.

[0100] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0101] The systems and techniques described here can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network ("LAN") and a wide area network ("WAN"), e.g., the Internet.

[0102] The computer system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.

[0103] The foregoing description of the exemplary embodiments is provided as is for the purpose of enabling any persons skilled in the art who are not familiar with the technology to understand and apply the present application. It will be apparent to those skilled in the art that various modifications and changes can be made thereto without departing from the scope of the present application, which is set forth in the appended claims. Thus, it is intended that the present application encompass such modifications and changes as fall within the scope of the appended claims.

Claims

1. A method for calculating the component separation of grounding current in high-voltage AC submarine cables, characterized in that, include: Current transformers were installed on the cable body, metal sheath grounding wire, and armored grounding wire at both ends of the high-voltage AC submarine cable on site. Obtain the current monitoring value flowing through the current transformer; Vector calculations are performed on the current monitoring quantities to obtain the current vectors of the submarine cable cores, the grounding current vector of the metal sheath, and the grounding current vector of the armor layer at both ends; Vector calculations are performed on the current vectors to obtain the capacitive current components and electromagnetic induction current components of the metal sheath grounding current and the armor grounding current. By combining the capacitive current component and the electromagnetic induction current component with the submarine cable core current vector, the proportional coefficient of capacitive current leakage of the metal sheath and armor and the proportional coefficient of electromagnetic induction current of the grounding loop are calculated. The formula for vector calculation of the aforementioned current monitoring quantity is as follows: ， in, A 1 represents the current monitoring value of the current sensor on the submarine cable body at the head end; A 2 represents the current monitored by the current sensor on the metal-sheathed grounding wire at the first end; A 3 represents the current monitored by the current sensor of the armored grounding wire at the front end; A 4 represents the current monitoring value of the current sensor on the end submarine cable body; A 5 represents the current monitoring value of the end metal sheath grounding wire current sensor; A 6 represents the current monitoring value of the end-armored grounding wire current sensor; I 1 represents the core current flowing into the cable body from the beginning of the submarine cable, with the positive direction being horizontal towards the center of the submarine cable. I 2 represents the current flowing out of the grounding wire of the metal sheath at the beginning of the submarine cable, with the positive direction being vertically downward toward the grounding point of the metal sheath; I 3 represents the current flowing out of the armored grounding wire at the beginning of the submarine cable, with the positive direction being vertically downward towards the armored grounding point; I 4 represents the core current flowing into the cable body from the end of the submarine cable, with the positive direction being horizontal towards the center of the cable. I 5 represents the current flowing out of the grounding wire of the metal sheath at the end of the submarine cable, with the positive direction being vertically downward towards the grounding point of the metal sheath; I 6 represents the current flowing out of the armored grounding wire at the end of the submarine cable, with the positive direction being vertically downward towards the armored grounding point; The formula for vector calculation of the current vector is as follows: ， in, I s_c This refers to the capacitive current component in the grounding current of the metal sheath. I a_c This refers to the capacitive current component in the armored grounding current. I s_dcgy This refers to the electromagnetic induced current component in the grounding current of the metal sheath. I a_dcgy This refers to the electromagnetic induced current component in the armor grounding current. The proportionality coefficient of the capacitor current leakage through the metal sheath and armor and the proportionality coefficient of the electromagnetic induction current in the grounding loop are calculated using the following formula: ， in, k c_s The capacitance current leakage ratio coefficient of the metal sheath; k c_a This is the proportional coefficient for capacitor current leakage in armored systems. k g_s The proportionality coefficient of the electromagnetic induction current in the grounding circuit of the metal sheath; k g_a This is the proportional coefficient of the electromagnetic induction current in the grounding loop of the armor.

2. The method for component separation and calculation of high-voltage AC submarine cable grounding current according to claim 1, characterized in that, When installing current transformers, the positive direction of the current sensors at both ends of the submarine cable body should be horizontally to both sides of the center of the submarine cable body.

3. The method for component separation calculation of high-voltage AC submarine cable grounding current according to claim 1, characterized in that, When installing current transformers, the positive direction for the current sensors of the grounding wires of the metal sheath at both ends of the submarine cable should be vertically upward from the grounding point of the metal sheath.

4. The method for component separation calculation of high-voltage AC submarine cable grounding current according to claim 1, characterized in that, When installing current transformers, the positive direction of the current sensor of the armored grounding wire at both ends of the submarine cable should be vertically upward from the armored grounding point.

5. A system for calculating the component separation of grounding current in high-voltage AC submarine cables, used to implement the component separation calculation method according to any one of claims 1-4, characterized in that, include: Current transformer installation unit: used to install current transformers on the cable body, metal sheath grounding wire and armored grounding wire at both ends of the high voltage AC submarine cable in the field. Current monitoring acquisition unit: used to acquire the current monitoring value flowing through the current transformer; Current vector calculation unit: used to perform vector calculations on the current monitoring quantities to obtain the current vector of the submarine cable core, the grounding current vector of the metal sheath, and the grounding current vector of the armor layer at both ends; Current component calculation unit: used to perform vector calculation on the current vector to obtain the capacitive current component and electromagnetic induction current component of the metal sheath grounding current and armor grounding current. Proportional coefficient calculation unit: By combining the capacitive current component and electromagnetic induction current component with the submarine cable core current vector, the proportional coefficient of capacitive current leakage of metal sheath and armor and the proportional coefficient of electromagnetic induction current of grounding circuit are calculated.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, 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 4.

7. 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 4.

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