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

Abstract

The invention discloses a component separation calculation method, system and device for grounding current of a high-voltage alternating-current submarine cable and a medium. The component separation calculation method comprises the steps that current transformers are additionally arranged on submarine cable bodies at the head end and the tail end of an on-site high-voltage alternating-current submarine cable, a metal sheath grounding wire and an armored grounding wire; acquiring the current monitoring quantity flowing through the current transformer; performing vector calculation on the current monitoring quantity to obtain submarine cable core current vectors, metal sheath grounding current vectors and armor layer grounding current vectors at the head end and the tail end; vector calculation is carried out on the current vectors to obtain capacitance current components and electromagnetic induction current components of metal sheath grounding current and armoring grounding current, and the capacitance current leakage proportionality coefficient of the metal sheath and the armoring and the electromagnetic induction current proportionality coefficient of a grounding loop are calculated by further combining the submarine cable core current vectors; therefore, the grounding loop state of the metal sheath and the whole armored wire of the submarine cable and the main insulation and sheath external insulation state of the submarine cable are monitored.

Description

TECHNICAL FIELD

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

[0002] With the gradual increase of urban power consumption in recent years, the city center gradually forms a power transmission mode mainly using high-voltage cables and supplemented by overhead lines. Overhead lines are prone to be affected by extreme weather during operation, and lightning strikes on lines may cause lightning current to invade the line. Cable lines connected to 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. It only judges whether the submarine cable is in a normal running state from the amplitude of the grounding current, and has no more monitoring angles. 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 AC 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 field submarine cable to obtain corresponding current monitoring values. The capacitive current and the inductive current in the grounding current are separated by vector calculation. 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 AC submarine cable grounding current, which comprises: 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 AC submarine cable; 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; 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; combining the capacitive current components and the electromagnetic induction current components with the submarine cable core current vectors to calculate the capacitive current leakage proportion coefficient and the grounding loop electromagnetic induction current proportion coefficient of the metal sheath and the armored wire.

[0007] 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 respectively the horizontal direction to the central of the submarine cable body.

[0008] 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 respectively the horizontal direction to the central of the submarine cable body.

[0009] 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 respectively the horizontal direction to the central of the submarine cable body.

[0010] Further, the formula for vector calculation of the current monitoring quantity is as follows: , 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 the horizontal direction to the central 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 the vertical direction downward to 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 the vertical direction downward to the grounding point of the armored; 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 the horizontal direction to the central 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 the vertical direction downward to 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 the vertical direction downward to the grounding point of the armored.

[0011] Further, the formula for vector calculation of the current vector is as follows: , 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 armored grounding current; Is_dcgy for the electromagnetic induction current component in the metal sheath grounding current; I a_dcgy for the electromagnetic induction current component in the metal sheath grounding current;

[0012] Further, the capacitive current leakage proportionality coefficient of the metal sheath and the grounding loop electromagnetic induction current proportionality coefficient of the armor are calculated by the following formula: , wherein, k c_s for the capacitive current leakage proportionality coefficient of the metal sheath; k c_a for the capacitive current leakage proportionality coefficient of the armor, k g_s for the grounding loop electromagnetic induction current proportionality coefficient of the metal sheath; k g_a for the grounding loop electromagnetic induction current proportionality coefficient of the armor.

[0013] In a second aspect, the present application provides a component separation calculation system for the grounding current of the high-voltage AC submarine cable, which is used to realize the component separation calculation method of the grounding current of the high-voltage AC submarine cable, and comprises: a current transformer installation unit, which is used to obtain current monitoring values of the current transformer, and the current transformer 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; a current monitoring value acquisition unit, which is used to obtain the current monitoring values of the current transformer; a current vector calculation unit, which is used to perform vector calculation on the current monitoring values 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; a current component calculation unit, which is used to perform vector calculation on the current vectors to obtain the capacitive current component and the electromagnetic induction current component of the metal sheath grounding current and the armor grounding current; a proportionality coefficient calculation unit, which 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 grounding loop electromagnetic induction current proportionality coefficient.

[0014] In a third aspect, the present application provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor realizes the steps of the component separation calculation method when executing the computer program.

[0015] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the component separation calculation method.

[0016] Compared with the prior art, the present application installs a current transformer on the submarine cable body, the metal sheath grounding wire and the armored grounding wire of the high-voltage alternating current submarine cable in 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 grounding loop electromagnetic induction current proportion coefficient, thereby monitoring the grounding loop state of the metal sheath and the armor of the submarine cable, and the state of the main insulation and the sheath outer insulation of the submarine cable, thereby providing support for the submarine cable operation and maintenance strategy making and online monitoring of dispatching data, and providing a theoretical basis for subsequent offshore wind power grid connection design via high-voltage alternating current submarine cables. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 Flow chart of the component separation calculation method for the grounding current of the high-voltage alternating current submarine cable of the present application; Figure 2 Schematic diagram of the installation position of the current sensor of the submarine cable body, the metal sheath grounding wire and the armored grounding wire at the first and last ends of the submarine cable in the embodiment of the present application; Figure 3 Structure diagram of the submarine cable in the embodiment of the present application; Figure 4 Simplified equivalent circuit diagram of the submarine cable in the embodiment of the present application; Figure 5 Capacitive current distribution diagram of the submarine cable in the embodiment of the present application; Figure 6 Equivalent circuit diagram of the electromagnetic induction current of the submarine cable in the embodiment of the present application; Figure 7 Corresponding vector diagram of each electrical quantity of the submarine cable in the embodiment of the present application; Figure 8 Composition diagram of the component separation calculation system for the grounding current of the high-voltage alternating current submarine cable of the present application; Figure 9 Logical structure schematic diagram of the computer device provided by the embodiment of the present application; Figure 3In the diagram, 1- conductor, 2- semi-conductive tape, 3-XPLE insulation layer, 4- insulation shielding layer, 5- metal sheath, 6- sheath insulation layer, 7- armor layer, 8- outer layer. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1 This embodiment is a method for calculating the component separation of the grounding current of a high-voltage AC submarine cable. Figure 1 As shown, the steps are as follows: a) Current transformers are installed on the submarine cable body, metal sheath grounding wire and armored grounding wire at both ends of the high-voltage AC submarine cable on site, for a total of 6 current transformers; b) Obtain the current monitoring values ​​of the six current transformers on the submarine cable body, metal sheath grounding wire, and armored grounding wire at both ends; c) performing vector calculation on the six current detection quantities obtained in step b) to obtain the submarine cable core current vector, the metal sheath grounding current vector, and the armor layer grounding current vector at both ends; d) for the six current vectors calculated in step c), respectively obtain the capacitive current component and the electromagnetic induction component of the metal sheath and the armor through vector calculation; e) The capacitive current component and the electromagnetic induction component in step d) are combined with the submarine cable core current vector in step c) to calculate the capacitive current leakage proportional coefficient of the metal sheath and armor and the electromagnetic induction current proportional coefficient of the grounding loop, thereby completing the component separation calculation method of the submarine cable grounding current.

[0021] Specifically, in step a), the six current sensors are installed by the following steps: a1) The positive direction of the current sensors installed at both ends of the submarine cable is horizontally from the center of the submarine cable to both sides; a2) The positive direction of the current sensor for the metal sheath grounding wire of the submarine cable at both ends is when the metal sheath grounding point is vertically upward; a3) The positive direction of the current sensor installation of the armored grounding wires of the submarine cable at both ends is vertically upward from the armored grounding point.

[0022] Specifically, the current monitoring quantity of the six current transformers in step b) is: the current monitoring quantity of the current sensor of the submarine cable body at the head end, recorded as A1; the current monitoring quantity of the head end metal sheath grounding line current sensor, denoted as A 2; the current monitoring quantity of the head end armored grounding line current sensor, denoted as A 3; the current monitoring quantity of the tail end submarine cable body current sensor, denoted as A 4; the current monitoring quantity of the tail end metal sheath grounding line current sensor, denoted as A 5; the current monitoring quantity of the tail end armored grounding line current sensor, denoted as A 6.

[0023] Specifically, in step c), the submarine cable core current vector, the metal sheath grounding current vector and the armored layer grounding current vector at the head and tail ends are obtained by the following steps: c1) obtaining the 6 current detection quantities obtained in step b) A 1 to A 6; c2) according to A 1 to A 6, the submarine cable core current vector, the metal sheath grounding current vector and the armored layer grounding current vector at the head and tail ends are calculated by vector calculation, and the calculation formula is as follows:

[0024] wherein, I 1 is the core current flowing into the submarine cable body at the head end of the submarine cable, and the positive direction is horizontally towards the center of the submarine cable; I 2 is the metal sheath grounding line current flowing out at the head end of the submarine cable, and the positive direction is vertically downward towards the metal sheath grounding point; I 3 is the armored grounding line current flowing out at the head end of the submarine cable, and the positive direction is vertically downward towards the armored grounding point; I 4 is the core current flowing into the submarine cable body at the tail end of the submarine cable, and the positive direction is horizontally towards the center of the submarine cable; I 5 is the metal sheath grounding line current flowing out at the tail end of the submarine cable, and the positive direction is vertically downward towards the metal sheath grounding point; I 6 is the armored grounding line current flowing out at the tail end of the submarine cable, and the positive direction is vertically downward towards the armored grounding point.

[0025] Specifically, in step d), the capacitive current component and the electromagnetic induction component of the metal sheath and the armor are obtained by vector calculation on the 6 current vectors calculated in step c); the following steps are taken: d1) obtaining the 6 current vectors I1 to I6 calculated in step c); d2) according to I1 to I6, the capacitive current component and the electromagnetic induction component of the metal sheath and the armor are obtained by vector calculation, and the calculation formula is as follows:

[0026] 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.

[0027] The specific steps of step e) are as follows: e1) obtaining the capacitive current component and the electromagnetic induction component in step d) I s_c , I a_c , I s_dcgy , I a_dcgy ; e2) obtaining the wire core current vectors I1, I4 in step c); e3) according to I s_c , I a_c , I s_dcgy , I a_dcgy and I1, I4, the capacitive current leakage proportionality coefficient of the metal sheath and the armor of the submarine cable and the grounding loop electromagnetic induction current proportionality coefficient are calculated, and the calculation formula is as follows:

[0028] 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.

[0029] Taking a 500kV typical single-core submarine cable in actual operation as an example, the following application of the component separation calculation method of the application to the submarine current grounding current is component separation calculation, and the specific steps are as follows: a) installing 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, such as Figure 2The submarine cable model is HYJQ71-F290 / 500kV 1x1800mm 2 The submarine cable cross-sectional view is shown in Figure 3 ; b) Obtain the current monitoring values of the 6 current transformers of the submarine cable body, sheath grounding wire and armored grounding wire at the first and last ends, respectively denoted as A 1 to A 6, whose values are respectively: A 1=939.7+664.6i amperes, A 2=235A∠113.5°, A 3=803.1A∠180.3°, A 4=-129.8-804.8 amperes, A 5=88.6A∠66.5°, A 6=802.9A∠0.3°; c) Vector calculation is performed on the 6 current detection values obtained in step b) to obtain the submarine cable core current vector, metal sheath grounding current vector and armored layer grounding current vector at the first and last ends, which are brought into calculation to obtain: I1= =886.9A∠0°, I2= =235A∠113.5°, I3= =803.1A∠180.3°, I4= =830A∠175.1°, I5= =88.6A∠66.5°, I6= =802.9A∠0.3°; the simplified equivalent circuit diagram of the submarine cable is shown in Figure 4 , Figure 4 , I c represents the capacitive leakage current of unit length of the submarine cable, A; M , N , G respectively represent the metal sheath of the first end, the last end and the midpoint of the submarine cable; C represents the capacitance of unit length of the submarine cable, F; represents the total length of the submarine cable, km; d) Obtain the 6 current vectors calculated in step c), and obtain the capacitive current component and electromagnetic induction component of the metal sheath and the armor through vector calculation, and substitute into the calculation to obtain: I s_c = =316.1A∠90°, I a_c = =2.5A∠90°, I s_dcgy = =81.0A∠90°, I a_dcgy = =803.0A∠90°; the current distribution of submarine cable capacitance is as follows: Figure 5 As shown, each parameter conforms to the following formula:

[0030] Where, R s 、 X s 、 R a 、 X a are the resistance and self-inductance of the metal sheath and armor respectively, I si 、 I ai are the electromagnetic induced currents flowing through the metal sheath and armor of phase i, i=A, B, C respectively; R e is the earth equivalent leakage resistance; R e1 、 R e2 are the grounding resistances at both ends of the submarine cable line; U si , U' si, U" si The induced voltages on the metal sheath of phase i are respectively generated by the three-phase submarine cable core, the other two-phase metal sheath current, and the three-phase armor current; U ai , U' ai, U" ai The induced voltages on the i-th phase armor are respectively the three-phase submarine cable core current, the three-phase metal sheath current, and the other two-phase armor current.

[0031] The equivalent circuit of the electromagnetic induction current in the submarine cable, such as Figure 6 As shown, 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 core current of the submarine cable, 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.

[0032] The corresponding vector diagrams of the electrical quantities of the submarine cable are as follows: Figure 7 As shown, is the current at the first end of the metal sheath, kA; is the current at the end of the metal sheath, kA; Voltage on the equivalent impedance of the submarine cable, kV.

[0033] e) Obtain the capacitive current component and the electromagnetic induction component in step d), combine the wire core current vector in step c), calculate the capacitive current leakage proportionality coefficient of the metal sheath and the armor of the submarine cable and the electromagnetic induction current proportionality coefficient of the grounding loop, and substitute into the calculation to obtain: 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 electromagnetic induction current proportionality coefficient of the grounding loop.

[0034] Example 2 The embodiment provides a component separation calculation system for the grounding current of a high-voltage alternating current submarine cable, which is used for realizing the component separation calculation method for the grounding current of the high-voltage alternating current submarine cable in Example 1, as shown in the figure, which is composed of a current monitoring quantity acquisition unit, a current vector calculation unit, a current component calculation unit and a proportionality coefficient calculation unit. Figure 8

[0035] Current monitoring quantity acquisition unit: used for acquiring the current monitoring quantity 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 alternating current submarine cable; Current vector calculation unit: used for performing vector calculation on the current monitoring quantity to obtain the wire core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at the two ends; Current component calculation unit: 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; Proportionality coefficient calculation unit: combines the capacitive current component and the electromagnetic induction current component with the wire core current vector to calculate the capacitive current leakage proportionality coefficient of the metal sheath and the armor and the electromagnetic induction current proportionality coefficient of the grounding loop.

[0036] ​​​​​It should be noted that each unit in the above high-voltage alternating current submarine cable grounding current component separation calculation system can be realized by software, hardware, and combinations thereof, in whole or in part. The above units can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above units. For specific limitations of the high-voltage alternating current submarine cable grounding current component separation calculation system, refer to the limitations of the high-voltage alternating current submarine cable grounding current component separation calculation method (i.e. embodiment 1) in the above, both of which have the same functions and effects, and will not be described here.

[0037] Embodiment 3 The embodiment provides a computer device, including: at least one processor; and a memory connected with the at least one processor in communication. The memory stores a computer program capable of being executed by the at least one processor, and the computer program is used for causing the electronic device to execute the method according to the embodiment 1 of the application when being executed by the at least one processor.

[0038] Embodiment 4 The embodiment provides a non-transitory computer readable storage medium storing a computer program, wherein the computer program is used for causing the computer to execute the method according to the embodiment 1 of the application when being executed by a processor of the computer.

[0039] Reference Figure 9 The structure block diagram of the electronic device 400 which can be a server or a client of the present application will now be described, which is an example of a hardware device that can be applied to aspects of the present application. The electronic device is intended to represent a wide variety of digital electronic computing devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computing devices. The electronic device can also represent a wide variety of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application described and / or claimed in this document.

[0040] As Figure 9As shown, the electronic device 400 includes a computing unit 401 that can perform various appropriate actions and processes in accordance with a computer program stored in a read-only memory (ROM) 402 or a computer program loaded into a random access memory (RAM) 403 from a storage unit 408. In the RAM 403, various programs and data required for the operation of the electronic device 400 can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0041] 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.

[0042] 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 grounding current can be implemented as a computer software program that 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 grounding current by any other appropriate means, such as by means of firmware.

[0043] Program code for carrying out operations of 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 block diagrams. The program code can be executed entirely on a machine, partially on a machine, partially on a machine as part of a separate software package, and partially on a remote machine or entirely on a remote machine or server.

[0044] 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 media can include, without limitation, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 component separation calculation method for the grounding current of a high-voltage AC submarine cable, characterized in that: include: Obtaining a current monitoring value flowing through a current transformer, wherein the current transformer is installed on the submarine cable body, the metal sheath grounding wire, and the armored grounding wire at both ends of the high-voltage AC submarine cable; Performing vector calculation on the current monitoring quantity to obtain the submarine cable core current vector, the metal sheath grounding current vector and the armor layer grounding current vector at both ends; 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; The capacitive current component and the electromagnetic induction current component are combined with the submarine cable core current vector to calculate the capacitive current leakage proportional coefficient of the metal sheath and armor and the electromagnetic induction current proportional coefficient of the ground loop.

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

3. The component separation calculation method for high-voltage AC submarine cable grounding current according to claim 1 is characterized in that: When installing the current transformer, the positive direction of the current sensor of the metal sheath grounding wire of the submarine cable at both ends is with the metal sheath grounding point vertically upward.

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

5. The component separation calculation method for high-voltage AC submarine cable grounding current according to claim 1 is characterized in that: The formula for vector calculation of the current monitoring quantity is as follows: ， in, A 1 is the current monitoring value of the current sensor of the submarine cable body at the head end; A 2 is the current monitoring value of the current sensor of the metal sheath grounding wire at the head end; A 3 is the current monitoring value of the current sensor of the armored grounding wire at the head end; A 4 is the current monitoring value of the current sensor of the terminal submarine cable body; A 5 is the current monitoring value of the current sensor of the metal sheath grounding wire at the end; A 6 is the current monitoring value of the end armored grounding wire current sensor; I 1 is the core current flowing from the head end of the submarine cable into the submarine cable body, and the positive direction is horizontally toward the center of the submarine cable; I 2 is the outflow current of the metal sheath grounding wire at the head end of the submarine cable, and the positive direction is vertically downward toward the metal sheath grounding point; I 3 is the outflow current of the armored grounding wire at the head end of the submarine cable, and the positive direction is vertically downward toward the armored grounding point; I 4 is the core current flowing from the end of the submarine cable into the submarine cable body, and the positive direction is horizontally toward the center of the submarine cable; I 5 is the outflow current of the metal sheath grounding wire at the end of the submarine cable, and the positive direction is vertically downward toward the metal sheath grounding point; I 6 is the outflow current of the armored grounding wire at the end of the submarine cable, and the positive direction is vertically downward toward the armored grounding point.

6. The component separation calculation method for high-voltage AC submarine cable grounding current according to claim 5 is characterized in that: The formula for vector calculation of the current vector is as follows: ， in, 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.

7. The component separation calculation method for high-voltage AC submarine cable grounding current according to claim 6 is characterized in that: The capacitance current leakage proportional coefficient flowing through the metal sheath and armor and the grounding loop electromagnetic induction current proportional coefficient are calculated by the following formula: ， in, k c_s is the capacitance current leakage proportional coefficient of the metal sheath; k c_a is the capacitance current leakage proportional coefficient of the armor, k g_s is the proportional coefficient of electromagnetic induction current in the grounding loop of the metal sheath; k g_a is the proportional coefficient of electromagnetic induction current in the armored grounding loop.

8. A component separation calculation system for a high-voltage AC submarine cable grounding current, used to implement the component separation calculation method for a high-voltage AC submarine cable grounding current according to any one of claims 1 to 7, characterized in that: include: Current monitoring quantity acquisition unit: used to obtain the current monitoring quantity flowing through the current transformer, which is installed on the submarine cable body, metal sheath grounding wire and armored grounding wire at both ends of the high-voltage AC submarine cable; Current monitoring quantity acquisition unit: used to obtain the current monitoring quantity flowing through the current transformer; Current vector calculation unit: used to perform vector calculation on the current monitoring quantity to obtain the submarine cable core current vector, metal sheath grounding current vector and armor layer grounding current vector at both ends; Current component calculation unit: used for performing vector calculation on the current vector to obtain the capacitive current component and electromagnetic induction current component of the metal sheath grounding current and the armor grounding current; 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 armor and the electromagnetic induction current proportionality coefficient of the ground loop.

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