Current collection submarine cable alternating current withstand voltage test system

Abstract

The utility model relates to a current collection submarine cable alternating current withstand voltage test system, which comprises a resonance test equipment unit, a test tool unit and a plurality of submarine cable high-voltage cabinet combination units connected in sequence, and each submarine cable high-voltage cabinet combination unit comprises a current collection submarine cable unit. The fan high-voltage cabinet equipment unit is connected with the current collection submarine cable unit; the resonance test equipment unit is connected with the test tool unit, and the test tool unit is connected with the current collection submarine cable unit in the first submarine cable high-voltage cabinet combination unit in the plurality of submarine cable high-voltage cabinet combination units; and the resonance test equipment unit is used for carrying out an alternating current withstand voltage test on each current collection submarine cable unit through the test tool unit. By adopting the system, the detection efficiency of the insulation performance of the current collection submarine cable can be improved.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to an AC withstand voltage test system for a power collection submarine cable. Background Art

[0002] In the field of power grids, in order to detect the insulation performance of the power collection submarine cable, it is very important to conduct AC withstand voltage tests on the power collection submarine cable.

[0003] Traditionally, AC withstand voltage testing of collector cables involves transporting test equipment to each wind turbine and performing AC withstand voltage tests on each cable segment. However, in an offshore wind farm, there are often dozens of these cables, requiring multiple lifts of test equipment to and from the wind turbines. This cumbersome process consumes significant time and manpower, resulting in low efficiency in testing the insulation performance of the collector cables. Utility Model Content

[0004] Based on this, it is necessary to provide a collector submarine cable AC withstand voltage test system that can improve the detection efficiency of the insulation performance of the collector submarine cable.

[0005] This application provides an AC withstand voltage test system for a collector submarine cable, comprising:

[0006] A resonance test equipment unit, a test fixture unit, and a plurality of sequentially connected submarine cable high-voltage cabinet assembly units, each submarine cable high-voltage cabinet assembly unit comprising a power collection submarine cable unit and a wind turbine high-voltage cabinet equipment unit connected to the power collection submarine cable unit;

[0007] The resonance test equipment unit is connected to the test fixture unit, and the test fixture unit is connected to the power collection submarine cable unit in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units;

[0008] The resonance test equipment unit is used to perform an AC withstand voltage test on each of the power collection submarine cable units through the test fixture unit.

[0009] In one embodiment, the resonance test equipment unit includes a three-phase AC power supply, a variable frequency power supply, a test transformer, a first shunt reactor combination, a second shunt reactor combination, a capacitor combination, a voltmeter, and a communication controller;

[0010] The three-phase AC power supply is connected to the input end of the variable frequency power supply; the low-voltage side of the test transformer is connected to the output end of the variable frequency power supply, one end of the high-voltage side of the test transformer is connected to one end of the first parallel reactor combination, and the other end of the high-voltage side of the test transformer is grounded; the other end of the first parallel reactor combination is respectively connected to one end of the capacitor combination, one end of the second parallel reactor combination and one end of the test tooling unit; the other end of the capacitor combination and the other end of the second parallel reactor combination are both grounded, and the two ends of the low-voltage capacitor in the capacitor combination are connected to the voltmeter; the input end of the communication controller is connected to the output end of the voltmeter, and the output end of the communication controller is connected to the communication end of the variable frequency power supply.

[0011] In one embodiment, the first shunt reactor combination and the second shunt reactor combination each include at least one reactor.

[0012] In one embodiment, the capacitor combination includes a high-voltage capacitor and the low-voltage capacitor;

[0013] One end of the high-voltage capacitor is connected to the other end of the first shunt reactor combination, the other end of the high-voltage capacitor is connected to one end of the low-voltage capacitor, the other end of the low-voltage capacitor is grounded, and the voltmeter is connected to both ends of the low-voltage capacitor.

[0014] In one embodiment, the test fixture unit includes a test bushing and a test high-voltage conductor;

[0015] One end of the test bushing is connected to the collecting submarine cable unit in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units, the other end of the test bushing is connected to one end of the test high-voltage wire, and the other end of the test high-voltage wire is connected to the resonance test equipment unit.

[0016] In one embodiment, the test high-voltage conductor is a corrugated tube through-core copper conductor.

[0017] In one embodiment, both ends of the power collection cable unit are terminal connectors;

[0018] One terminal connector of the power collecting submarine cable unit in the first submarine cable high-voltage cabinet assembly unit is connected to the test tooling unit, and the other terminal connector is connected to the wind turbine high-voltage cabinet equipment unit in the first submarine cable high-voltage cabinet assembly unit.

[0019] In one embodiment, the terminal connector includes lead wires from the cable sheath layer and the shielding layer; the lead wires are all grounded.

[0020] In one embodiment, the wind turbine high-voltage cabinet equipment unit includes wind turbine electrical equipment, wind turbine step-up transformer, wind turbine step-up transformer circuit breaker, wind turbine step-up transformer busbar side grounding knife switch, wind turbine step-up transformer busbar side disconnector, busbar, submarine cable incoming side disconnector, submarine cable outgoing side disconnector, incoming side grounding knife switch, incoming plug-in lightning arrester, incoming side live display, submarine cable incoming terminal socket, outgoing side grounding knife switch, outgoing side live display, submarine cable outgoing terminal socket;

[0021] The wind turbine electrical equipment is connected to one end of the wind turbine step-up transformer; one end of the wind turbine step-up transformer circuit breaker is connected to the other end of the wind turbine step-up transformer, and the other end of the wind turbine step-up transformer circuit breaker is respectively connected to one end of the wind turbine step-up transformer busbar side grounding knife switch and one end of the wind turbine step-up transformer busbar side disconnector; the other end of the wind turbine step-up transformer busbar side grounding knife switch is grounded; the other end of the wind turbine step-up transformer busbar side disconnector is connected to the busbar; one end of the busbar is connected to one end of the submarine cable incoming line side disconnector, and the other end of the busbar is connected to one end of the submarine cable outgoing line side disconnector; the other end of the submarine cable incoming line side disconnector is respectively connected to One end of the incoming line side grounding switch, the input end of the incoming line plug-in lightning arrester, the incoming line side live display and one end of the submarine cable incoming line terminal socket are connected; the other end of the incoming line side grounding switch and the output end of the incoming line plug-in lightning arrester are both grounded; the other end of the submarine cable incoming line terminal socket is connected to the power collection submarine cable unit corresponding to the wind turbine high-voltage cabinet equipment unit; the other end of the submarine cable outgoing line side disconnector is respectively connected to one end of the outgoing line side grounding switch, the outgoing line side live display and one end of the submarine cable outgoing line terminal socket; the other end of the outgoing line side grounding switch is grounded; the other end of the submarine cable outgoing line terminal socket is connected to the next power collection submarine cable unit.

[0022] In one embodiment, the system includes at least two submarine cable high-voltage cabinet assembly units.

[0023] The above-mentioned AC withstand voltage test system for the power collection submarine cable connects multiple submarine cable high-voltage cabinet combination units in sequence, so that each power collection submarine cable unit is connected in sequence, and then each power collection submarine cable unit can be tested at the same time, avoiding the method of conducting AC withstand voltage tests on the power collection submarine cables one by one, which is easy to consume a lot of time and manpower, resulting in low efficiency in detecting the insulation performance of the power collection submarine cable, thereby improving the detection efficiency of the insulation performance of the power collection submarine cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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 paying any creative work.

[0026] Figure 1 Schematic diagram of the structure of a collector submarine cable AC withstand voltage test system in one embodiment;

[0027] Figure 2 Schematic diagram of an AC withstand voltage test system for a collector submarine cable in one embodiment.

[0028] Reference numerals:

[0029] 100, power collection submarine cable unit; 200, wind turbine high-voltage cabinet equipment unit; 300, test fixture unit; 400, resonance test equipment unit; 500, submarine cable high-voltage cabinet assembly unit; 110, first power collection submarine cable; 120, second power collection submarine cable; 130, third power collection submarine cable; 211, first submarine cable incoming terminal socket; 212, first submarine cable outgoing terminal socket; 213, first submarine cable incoming side disconnector; 214, first submarine cable outgoing side disconnector; 215, first incoming side live indicator; 216, first outgoing side live indicator; 217, first incoming plug-in arrester; 218, first incoming Side grounding switch; 219, first outgoing line side grounding switch; 2110, first busbar; 2111, first wind turbine step-up transformer busbar side disconnector; 2112, first wind turbine step-up transformer busbar side grounding switch; 2113, first wind turbine step-up transformer circuit breaker; 2114, first wind turbine step-up transformer; 2115, first wind turbine electrical equipment; 221, second submarine cable incoming line terminal socket; 222, second submarine cable outgoing line terminal socket; 223, second submarine cable incoming line side disconnector; 224, second submarine cable outgoing line side disconnector; 225, second incoming line side live indicator; 226, second outgoing line side live indicator; 227, Second incoming plug-in arrester; 228, second incoming grounding switch; 229, second outgoing grounding switch; 2210, second busbar; 2211, second wind turbine step-up transformer busbar side disconnector; 2212, second wind turbine step-up transformer busbar side grounding switch; 2213, second wind turbine step-up transformer circuit breaker; 2214, second wind turbine step-up transformer; 2215, second wind turbine electrical equipment; 231, third submarine cable incoming terminal socket; 232, third submarine cable incoming side disconnector; 233, third incoming line live indicator; 234, third incoming plug-in arrester; 235, third incoming line side grounding switch; 236 6. The third busbar; 237. The disconnector on the busbar side of the third fan step-up transformer; 238. The grounding switch on the busbar side of the third fan step-up transformer; 239. The circuit breaker of the third fan step-up transformer; 2310. The step-up transformer of the third fan; 2311. The electrical equipment of the third fan; 310. The test bushing; 320. The test high-voltage conductor; 410. The three-phase AC power supply; 420. The variable frequency power supply; 430. The test transformer; 440. The first parallel reactor combination; 450. The second parallel reactor combination; 460. The capacitor combination; 461. The high-voltage capacitor; 462. The low-voltage capacitor; 470. The voltmeter; 480. The communication controller. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0032] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0033] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0034] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0035] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0036] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0037] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0038] In an exemplary embodiment, Figure 1As shown, the present application provides a power collection submarine cable AC withstand voltage test system, which includes: a resonance test equipment unit 400, a test tooling unit 300 and a plurality of submarine cable high-voltage cabinet assembly units 500 connected in sequence, each submarine cable high-voltage cabinet assembly unit 500 includes a power collection submarine cable unit 100, and a wind turbine high-voltage cabinet equipment unit 200 connected to the power collection submarine cable unit 100; the resonance test equipment unit 400 is connected to the test tooling unit 300, and the test tooling unit 300 is connected to the power collection submarine cable unit 100 in the first submarine cable high-voltage cabinet assembly unit in the multiple submarine cable high-voltage cabinet assembly units 500; the resonance test equipment unit 400 is used to perform an AC withstand voltage test on each power collection submarine cable unit 100 through the test tooling unit 300.

[0039] The resonance test equipment unit 400 refers to equipment corresponding to performing an AC withstand voltage test on each power collection submarine cable unit 100 , such as a variable frequency resonance test equipment unit.

[0040] The test fixture unit 300 refers to a device corresponding to a test voltage injection position for providing the power collection submarine cable unit 100 , such as an electrical performance test fixture unit.

[0041] It should be noted that the test fixture 300 and the resonance test equipment unit 400 are arranged in the offshore booster station, and the pressurization operation and the phase sequence replacement of the collector submarine cable in the test process are all carried out on the offshore booster station.

[0042] The submarine cable high voltage cabinet assembly unit 500 includes a power collection submarine cable unit 100 and a wind turbine high voltage cabinet equipment unit 200. It should be noted that the power collection submarine cable unit 100 and the wind turbine high voltage cabinet equipment unit 200 in the submarine cable high voltage cabinet assembly unit 500 are interconnected.

[0043] The power collection cable unit 100 refers to a power collection cable that needs to undergo an AC withstand voltage test, such as a cross-linked polyethylene insulated cable. Figure 2 As shown, the power collection cable unit 100 includes a first power collection cable 110 , a second power collection cable 120 and a third power collection cable 130 .

[0044] The wind turbine high-voltage cabinet equipment unit 200 refers to the corresponding equipment used to connect every two power collection submarine cable units 100, including an incoming line cabinet and an outgoing line cabinet.

[0045] The AC withstand voltage test refers to a test process for detecting the insulation performance and voltage tolerance of the collector submarine cable unit 100 .

[0046] Exemplarily, the resonance test equipment unit 400 is connected to the test fixture unit 300, and the test fixture unit 300 is connected to the power collection cable unit 100 in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units 500. When performing the AC withstand voltage test of the power collection cable, the resonance test equipment unit 400 generates a test voltage and outputs the same test voltage to the power collection cable units 100 in each submarine cable high-voltage cabinet assembly unit 500 through the test fixture unit 300, so as to perform an AC withstand voltage test on each power collection cable unit 100; for example, according to the insulation resistance value before the test and the insulation resistance value after the test of each power collection cable unit 100 under the same test voltage, the AC withstand voltage test result of each power collection cable unit 100 is determined; for example, if there is no obvious change in the insulation resistance value before the test and the insulation resistance value after the test (for example, the insulation resistance before the test is greater than the insulation resistance after the test), ... the insulation resistance value before the test and the insulation resistance value after the test are greater than the insulation resistance before the test, the AC withstand voltage test result of each power collection cable unit 100 is determined; for example, if the insulation resistance value before the test and the insulation resistance value after the test are greater than the insulation resistance before the test, the AC withstand voltage test result of each power collection cable unit 100 is determined; for example, if the insulation resistance value before the test and the insulation resistance value after the test are greater than the insulation resistance before the test, the AC withstand voltage test result of each power collection cable unit 100 is determined; for example, if the insulation resistance value before the test and the insulation resistance value after the test are greater than the The AC withstand voltage test results of each power collecting cable unit 100 are determined to be qualified if the insulation resistance value before the test and the insulation resistance value after the test have obvious changes (for example, the difference between the insulation resistance value before the test and the insulation resistance value after the test is not within the preset difference), or power generation occurs in each power collecting cable unit 100 during the test, then the AC withstand voltage test results of each power collecting cable unit 100 are determined to be unqualified if the insulation resistance value before the test and the insulation resistance value after the test have obvious changes (for example, the difference between the insulation resistance value before the test and the insulation resistance value after the test is not within the preset difference), or power generation occurs in each power collecting cable unit 100 during the test, then the AC withstand voltage test results of each power collecting cable unit 100 are determined to be unqualified.

[0047] In this embodiment, by connecting multiple submarine cable high-voltage cabinet combination units in sequence, each power collection submarine cable unit is connected in sequence, and then each power collection submarine cable unit can be tested at the same time, avoiding the method of performing AC withstand voltage tests on the power collection submarine cables one by one, which is easy to consume a lot of time and manpower, resulting in low efficiency in detecting the insulation performance of the power collection submarine cable, thereby improving the detection efficiency of the insulation performance of the power collection submarine cable.

[0048] In an exemplary embodiment, Figure 2 As shown, the resonance test equipment unit includes a three-phase AC power supply 410 , a variable frequency power supply 420 , a test transformer 430 , a first shunt reactor combination 440 , a second shunt reactor combination 450 , a capacitor combination 460 , a voltmeter 470 and a communication controller 480 .

[0049] The three-phase AC power supply 410 is connected to the input end of the variable frequency power supply 420; the low-voltage side of the test transformer 430 is connected to the output end of the variable frequency power supply 420, one end of the high-voltage side of the test transformer 430 is connected to one end of the first parallel reactor combination 440, and the other end of the high-voltage side of the test transformer 430 is grounded; the other end of the first parallel reactor combination 440 is respectively connected to one end of the capacitor combination 460, one end of the second parallel reactor combination 450 and one end of the test tooling unit 300; the other end of the capacitor combination 460 and the other end of the second parallel reactor combination 450 are both grounded, and the two ends of the low-voltage capacitor in the capacitor combination 460 are connected to the voltmeter 470; the input end of the communication controller 480 is connected to the output end of the voltmeter 470, and the output end of the communication controller 480 is connected to the communication end of the variable frequency power supply 420.

[0050] The three-phase AC power source 410 is composed of three AC voltages with the same frequency, equal amplitude, and phases that differ by 120 degrees.

[0051] The variable frequency power supply 420 refers to a power supply that can provide the specific frequency and voltage required by different electrical devices, such as an analog variable frequency power supply, a digital variable frequency power supply, etc.

[0052] The test transformer 430 refers to a device capable of generating high voltage, such as a dry-type transformer, an oil-immersed transformer, and the like.

[0053] The first shunt reactor combination 440 refers to a shunt reactor combination connected in series with the power collection submarine cable unit. It should be noted that the reactors in the first shunt reactor combination 440 are connected in parallel with each other.

[0054] The second shunt reactor assembly 450 is a shunt reactor assembly connected in parallel with the power collection cable unit. It should be noted that the reactors in the second shunt reactor assembly 450 are connected in parallel. The second shunt reactor assembly 450 serves as a test current compensation branch, reducing the test main circuit current and the output power of the test power supply and excitation transformer.

[0055] It should be noted that the reactors in the first shunt reactor combination 440 and the reactors in the second shunt reactor combination 450 are both reactors commonly used in the market for AC withstand voltage tests of power collection submarine cables, such as oil-immersed reactors.

[0056] The capacitor combination 460 is composed of two capacitors connected in series.

[0057] Among them, the voltmeter 470 is a voltmeter commonly used in the market for AC withstand voltage testing of power collection submarine cables, such as a peak voltmeter.

[0058] The communication controller 480 refers to a device used for data transmission in the AC withstand voltage test of the power collection submarine cable, such as a wireless communication controller, a serial communication controller, etc.

[0059] Exemplarily, the three-phase AC power supply 410 is connected to the input end of the variable frequency power supply 420, the low-voltage side of the test transformer 430 is connected to the output end of the variable frequency power supply 420, one end of the high-voltage side of the test transformer 430 is connected to one end of the first parallel reactor combination 440, the other end of the high-voltage side of the test transformer 430 is grounded, the other end of the first parallel reactor combination 440 is respectively connected to one end of the capacitor combination 460, one end of the second parallel reactor combination 450 and one end of the test tooling unit 300, the other end of the capacitor combination 460 and the other end of the second parallel reactor combination 450 are both grounded, the two ends of the low-voltage capacitor in the capacitor combination 460 are connected to the voltmeter 470, the input end of the communication controller 480 is connected to the output end of the voltmeter 470, and the output end of the communication controller 480 is connected to the communication end of the variable frequency power supply 420. When conducting an AC withstand voltage test on a power collection cable, a test voltage is generated by a three-phase AC power supply 410 and a variable frequency power supply 420, and the test voltage is amplified by a test transformer 430 to obtain an amplified test voltage. The test voltage is then provided to the power collection cable unit 100 through the first parallel reactor combination 440, and the voltages at both ends of the low-voltage capacitor in the capacitor combination 460 are collected through a voltmeter 470. The voltage value of the power collection cable unit 100 is determined based on the voltages at both ends, and the voltage is returned to the variable frequency power supply 420 through the communication controller 480, so that the variable frequency power supply 420 adjusts the test voltage based on the voltage value of the power collection cable unit 100, so that the amplified test voltage corresponding to the adjusted test voltage is equal to the preset voltage value of the power collection cable unit 100.

[0060] In this embodiment, by real-time monitoring of the voltage value of the power collection submarine cable unit 100 and timely feedback to the variable frequency power supply 420 for test voltage adjustment, the test voltage can be controlled more accurately to ensure the accuracy of the test results; moreover, through precise voltage control, damage to the power collection submarine cable caused by excessive voltage can be avoided, which is conducive to reducing safety risks during the test process.

[0061] In an exemplary embodiment, Figure 2 As shown, the first shunt reactor combination 440 and the second shunt reactor combination 450 each include at least one reactor.

[0062] Exemplarily, the first parallel reactor combination 440 and the second parallel reactor combination 450 are composed of a single reactor or a plurality of reactors, and the reactors in the first parallel reactor combination 440 and the second parallel reactor combination 450 are connected in parallel.

[0063] In an exemplary embodiment, Figure 2 As shown, the capacitor combination 460 includes a high-voltage capacitor 461 and a low-voltage capacitor 462 .

[0064] One end of the high-voltage capacitor 461 is connected to the other end of the first parallel reactor combination 440 , the other end of the high-voltage capacitor 461 is connected to one end of the low-voltage capacitor 462 , the other end of the low-voltage capacitor 462 is grounded, and the voltmeter 470 is connected to both ends of the low-voltage capacitor 462 .

[0065] The high-voltage capacitor 461 refers to a capacitor capable of withstanding a relatively high voltage, such as an oil-impregnated paper capacitor.

[0066] The low-voltage capacitor 462 refers to a capacitor suitable for a lower operating voltage, such as an oil-impregnated paper capacitor.

[0067] For example, one end of the high-voltage capacitor 461 is connected to the other end of the first shunt reactor assembly 440, the other end of the high-voltage capacitor 461 is connected to one end of the low-voltage capacitor 462, the other end of the low-voltage capacitor 462 is grounded, and a voltmeter 470 is connected to both ends of the low-voltage capacitor 462. When performing the AC withstand voltage test of the power collection cable, the voltage across the low-voltage capacitor 462 in the capacitor assembly 460 is collected by the voltmeter 470. Based on the voltage across the low-voltage capacitor 462 and the capacitance values of the high-voltage capacitor 461 and the low-voltage capacitor 462, the voltage value of the power collection cable unit 100 is determined.

[0068] In this embodiment, by connecting the voltmeter to both ends of the low-voltage capacitor, the voltage across the low-voltage capacitor is relatively low, which reduces the requirements and risks of the measuring equipment, thereby enabling more accurate and safe voltage measurement; moreover, the high-voltage capacitor plays a stabilizing and protective role when subjected to high voltage. By using the combination of high-voltage capacitors and low-voltage capacitors, the safety of the test and the measurement accuracy are jointly guaranteed.

[0069] In an exemplary embodiment, Figure 2 As shown, the test tool unit 300 includes a test bushing 310 and a test high-voltage conductor 320 .

[0070] One end of the test bushing 310 is connected to the collecting submarine cable unit 100 in the first submarine cable high-voltage cabinet assembly unit among multiple submarine cable high-voltage cabinet assembly units 500, and the other end of the test bushing 310 is connected to one end of the test high-voltage wire 320, and the other end of the test high-voltage wire 320 is connected to the resonance test equipment unit 400.

[0071] The test bushing 310 refers to an insulating component used to isolate and protect electrical connection points, such as an epoxy resin test bushing, a composite insulation test bushing, etc.

[0072] The test high-voltage conductor 320 refers to a conductor used to transmit high voltage, such as a corrugated tube through-core copper conductor.

[0073] For example, one end of the test bushing 310 is connected to the power collection submarine cable unit 100 in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units 500, and the other end of the test bushing 310 is connected to one end of the test high-voltage conductor 320, and the other end of the test high-voltage conductor 320 is connected to the resonance test equipment unit 400. When performing the AC withstand voltage test of the power collection submarine cable, the resonance test equipment unit 400 generates a test voltage, which passes through the test bushing 310 and the test high-voltage conductor 320 in sequence and is transmitted to the power collection submarine cable unit 100.

[0074] In this embodiment, by providing a test bushing 310 and a test high-voltage wire 320, a test voltage injection position is provided, and it is ensured that in a high-voltage test environment, no leakage or discharge occurs at the electrical connection point, thereby effectively preventing high voltage from causing danger to the surrounding environment and personnel.

[0075] In an exemplary embodiment, Figure 2 As shown, the test high-voltage conductor 320 is a copper conductor with a corrugated tube passing through it.

[0076] Among them, the corrugated tube through the core copper wire refers to a combination structure in which the copper wire passes through the corrugated tube.

[0077] It should be noted that, in actual scenarios, the test high-voltage conductor 320 refers to a corrugated tube-penetrating copper conductor with a diameter of 80 mm.

[0078] For example, one end of the test bushing 310 is connected to the power collection submarine cable unit 100 in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units 500, and the other end of the test bushing 310 is connected to one end of a copper conductor passing through the corrugated tube, and the other end of the copper conductor passing through the corrugated tube is connected to the resonance test equipment unit 400. When performing the AC withstand voltage test of the power collection submarine cable, the resonance test equipment unit 400 transmits the test voltage to the power collection submarine cable unit 100 through the test bushing 310 and the copper conductor passing through the corrugated tube.

[0079] In this embodiment, by adopting a corrugated tube through-core copper conductor, corona loss can be reduced and the quality factor of the test circuit can be improved.

[0080] In an exemplary embodiment, Figure 2 As shown, both ends of the power collection cable unit 100 are terminal connectors.

[0081] One terminal joint of the power collecting submarine cable unit 100 in the first submarine cable high-voltage cabinet assembly unit is connected to the test fixture unit 300 , and the other terminal joint is connected to the wind turbine high-voltage cabinet equipment unit 200 in the first submarine cable high-voltage cabinet assembly unit.

[0082] The terminal connector refers to a component that connects the power collection submarine cable unit 100 with other equipment, such as a prefabricated terminal connector.

[0083] For example, one terminal connector of the power collection cable unit 100 in the first submarine cable high-voltage cabinet assembly unit is connected to the test fixture unit 300, and the other terminal connector is connected to the wind turbine high-voltage cabinet equipment unit 200 in the first submarine cable high-voltage cabinet assembly unit. When performing the AC withstand voltage test of the power collection cable, the test voltage output by the test fixture unit 300 is transmitted to the power collection cable unit 100 through one terminal connector of the power collection cable unit 100, and is transmitted to the wind turbine high-voltage cabinet equipment unit 200 in the first submarine cable high-voltage cabinet assembly unit through the other terminal connector of the power collection cable unit 100.

[0084] In this embodiment, terminal connectors are provided at both ends of the power collection cable unit 100 to ensure a stable and good electrical connection between the power collection cable unit 100 and the test tooling unit 300 and the wind turbine high-voltage cabinet equipment unit 200.

[0085] In an exemplary embodiment, Figure 2 As shown, the terminal connector includes lead wires from the cable sheath layer and the shielding layer, and the lead wires are all grounded.

[0086] In an exemplary embodiment, Figure 2 As shown, the wind turbine high-voltage cabinet equipment unit 200 includes wind turbine electrical equipment, wind turbine step-up transformer, wind turbine step-up transformer circuit breaker, wind turbine step-up transformer busbar side grounding knife switch, wind turbine step-up transformer busbar side disconnector, busbar, submarine cable incoming side disconnector, submarine cable outgoing side disconnector, incoming side grounding knife switch, incoming plug-in lightning arrester, incoming side live display, submarine cable incoming terminal socket, outgoing side grounding knife switch, outgoing side live display, and submarine cable outgoing terminal socket.

[0087] The wind turbine electrical equipment is connected to one end of the wind turbine step-up transformer; one end of the wind turbine step-up transformer circuit breaker is connected to the other end of the wind turbine step-up transformer, and the other end of the wind turbine step-up transformer circuit breaker is respectively connected to one end of the grounding knife switch on the wind turbine step-up transformer busbar side and one end of the disconnector on the wind turbine step-up transformer busbar side; the other end of the grounding knife switch on the wind turbine step-up transformer busbar side is grounded; the other end of the disconnector on the wind turbine step-up transformer busbar side is connected to the busbar; one end of the busbar is connected to one end of the disconnector on the submarine cable incoming line side, and the other end of the busbar is connected to one end of the disconnector on the submarine cable outgoing line side; the other end of the disconnector on the submarine cable incoming line side is respectively connected to One end of the incoming line side grounding switch, the input end of the incoming line plug-in lightning arrester, the incoming line side live display and one end of the submarine cable incoming terminal socket are connected; the other end of the incoming line side grounding switch and the output end of the incoming line plug-in lightning arrester are both grounded; the other end of the submarine cable incoming terminal socket is connected to the collecting submarine cable unit corresponding to the wind turbine high-voltage cabinet equipment unit; the other end of the submarine cable outgoing side disconnector is respectively connected to one end of the outgoing line side grounding switch, the outgoing line side live display and one end of the submarine cable outgoing terminal socket; the other end of the outgoing line side grounding switch is grounded; the other end of the submarine cable outgoing terminal socket is connected to the next collecting submarine cable unit.

[0088] Among them, fan electrical equipment refers to electrical devices used for fan operation and control, such as motors.

[0089] Among them, the wind turbine step-up transformer refers to a transformer that increases the lower voltage generated by the wind turbine to a higher voltage suitable for transmission and distribution.

[0090] Among them, the wind turbine boost transformer circuit breaker refers to a switching device that can disconnect the wind turbine boost transformer circuit.

[0091] Among them, the grounding knife switch on the busbar side of the fan step-up transformer refers to a knife switch device that reliably grounds the busbar side of the fan step-up transformer.

[0092] Among them, the fan step-up transformer bus side isolating switch refers to the switching device that isolates the power supply on the bus side of the fan step-up transformer.

[0093] Among them, busbar refers to the conductor that collects and distributes electrical energy, such as rectangular busbar, tubular busbar, etc.

[0094] Among them, the submarine cable incoming side isolating switch refers to the switching device located at the incoming end of the collecting submarine cable, which is used to isolate the incoming power supply of the submarine cable.

[0095] Among them, the isolating switch on the outgoing side of the submarine cable refers to the switching device located at the outgoing end of the collecting submarine cable, which is used to isolate the outgoing power supply of the submarine cable.

[0096] Among them, the incoming line side grounding switch refers to the knife switch device used for grounding at the incoming line end.

[0097] Among them, the incoming line plug-in lightning arrester refers to a lightning arrester that limits the overvoltage at the incoming line end.

[0098] Among them, the live display on the incoming line side refers to a device located at the incoming line end of the collector submarine cable, which is used to display the voltage of the wind turbine high-voltage cabinet.

[0099] Among them, the submarine cable incoming terminal socket refers to the socket interface connected to the incoming end of the collector submarine cable.

[0100] Among them, the grounding knife switch on the outgoing line side refers to the knife switch device used for grounding at the outgoing line end.

[0101] Among them, the live display on the outgoing line side refers to the equipment located at the outgoing end of the collector submarine cable, which is used to display the voltage of the wind turbine high-voltage cabinet.

[0102] Among them, the submarine cable outlet terminal socket refers to the socket interface connected to the outlet end of the collector submarine cable.

[0103] For example, the wind turbine high-voltage cabinet equipment unit 200 includes a first submarine cable incoming terminal socket 211, a first submarine cable outgoing terminal socket 212, a first submarine cable incoming side disconnector 213, a first submarine cable outgoing side disconnector 214, a first incoming side live indicator 215, a first outgoing side live indicator 216, a first incoming plug-in lightning arrester 217, a first incoming side grounding knife switch 218, a first outgoing side grounding knife switch 219, a first busbar 21 10. First wind turbine boost transformer busbar-side disconnector 2111, first wind turbine boost transformer busbar-side grounding switch 2112, first wind turbine boost transformer circuit breaker 2113, first wind turbine boost transformer 2114, first wind turbine electrical equipment 2115, second submarine cable incoming terminal socket 221, second submarine cable outgoing terminal socket 222, second submarine cable incoming disconnector 223, second submarine cable outgoing disconnector 224, second incoming-side live indicator 225, second outgoing line side live indicator 226, second incoming line plug-in arrester 227, second incoming line side grounding switch 228, second outgoing line side grounding switch 229, second busbar 2210, second wind turbine step-up transformer busbar side disconnector 2211, second wind turbine step-up transformer busbar side grounding switch 2212, second wind turbine step-up transformer circuit breaker 2213, second wind turbine step-up transformer 2214, second wind turbine electrical equipment 2215, third submarine cable Incoming terminal socket 231, third submarine cable incoming side disconnector 232, third incoming side live display 233, third incoming plug-in lightning arrester 234, third incoming side grounding switch 235, third busbar 236, third wind turbine boost transformer busbar side disconnector 237, third wind turbine boost transformer busbar side grounding switch 238, third wind turbine boost transformer circuit breaker 239, third wind turbine boost transformer 2310, third wind turbine electrical equipment 2311. When conducting the AC withstand voltage test of the collector submarine cable, close the first collector submarine cable incoming line side disconnector 213, the first collector submarine cable outgoing line side disconnector 214, and the first wind turbine boost transformer busbar side grounding knife switch 2112, disconnect the first incoming line side grounding knife switch 218, the first collector submarine cable outgoing line side grounding knife switch 219, the first wind turbine boost transformer circuit breaker 2113, and the first wind turbine boost transformer busbar side disconnector 2111, and close the second collector submarine cable incoming line side disconnector 223, the second collector submarine cable outgoing line side disconnector 224, and the second wind turbine boost transformer busbar side grounding knife switch 22 12. Disconnect the second incoming line side grounding switch 228, the second collector cable outgoing line side grounding switch 229, the second wind turbine boost transformer circuit breaker 2213, and the second wind turbine boost transformer busbar side disconnector 2211, close the third collector cable incoming line side disconnector 232, the third wind turbine boost transformer busbar side grounding switch 238, and disconnect the third incoming line side grounding switch 235, the third wind turbine boost transformer circuit breaker 239, and the third wind turbine boost transformer busbar side disconnector 237, so that the test voltage can be transmitted to the collector cable unit 100 in each submarine cable high-voltage cabinet combination unit 500.

[0104] It should be noted that the connection of the fan high-voltage cabinet equipment unit 200 is as follows:

[0105] The first submarine cable incoming terminal socket is connected to the proximal end of the first submarine cable incoming side disconnector; the distal end of the first submarine cable incoming side disconnector is connected to the proximal end of the first busbar, and the distal end of the first busbar is connected to the proximal end of the first submarine cable outgoing side disconnector; the distal end of the first submarine cable outgoing side disconnector is connected to the first submarine cable outgoing terminal socket.

[0106] The second submarine cable incoming terminal socket is connected to the proximal end of the second submarine cable incoming side disconnector; the far end of the second submarine cable incoming side disconnector is connected to the proximal end of the second busbar, and the far end of the second busbar is connected to the proximal end of the second submarine cable outgoing side disconnector; the far end of the second submarine cable outgoing side disconnector is connected to the second submarine cable outgoing terminal socket.

[0107] The third submarine cable incoming terminal socket is connected to the proximal end of the third submarine cable incoming side disconnector; the far end of the third submarine cable incoming side disconnector is connected to the proximal end of the third busbar.

[0108] It should be noted that the connection conditions of the fan high-voltage cabinet equipment unit 200 also have the following common characteristics:

[0109] The grounding switch on the incoming line side is connected between the incoming line disconnector and the collector submarine cable; the proximal end of the disconnector on the busbar side of the wind turbine booster transformer is connected to the busbar, the distal end of the disconnector on the busbar side of the wind turbine booster transformer is connected to the proximal end of the wind turbine booster transformer circuit breaker, and the distal end of the wind turbine booster transformer circuit breaker is connected to the wind turbine booster transformer and the wind turbine electrical equipment; the grounding switch on the busbar side of the wind turbine booster transformer is connected between the disconnector on the busbar side of the wind turbine booster transformer and the wind turbine booster transformer circuit breaker; the live display on the outgoing line side is connected to the connection node of the outgoing line side disconnector, and the live display on the incoming line side is connected to the connection node of the incoming line side disconnector; the incoming line plug-in lightning arrester is connected to the proximal end of the incoming line side disconnector.

[0110] In this embodiment, a wind turbine high-voltage cabinet equipment unit 200 is provided to provide a connection function between the power collection cables, so that multiple power collection cables can be subjected to AC withstand voltage tests at the same time, which is beneficial to improving the detection efficiency of the insulation performance of the power collection cables.

[0111] In an exemplary embodiment, Figure 2 As shown, the collector submarine cable AC withstand voltage test system includes at least two submarine cable high-voltage cabinet combination units 500.

[0112] It should be noted that, in actual scenarios, the collector submarine cable AC withstand voltage test system includes 4-6 submarine cable high-voltage cabinet combination units 500.

[0113] For example, each submarine cable high voltage cabinet assembly unit 500 in the system is connected. When performing an AC withstand voltage test on the power collection submarine cable, the test voltage is transmitted in each submarine cable high voltage cabinet assembly unit 500 .

[0114] In this embodiment, by setting up multiple submarine cable high-voltage cabinet combination units 500, the AC withstand voltage test can be performed on the power collection submarine cables in the submarine cable high-voltage cabinet combination units 500 at the same time, avoiding the defect of conducting AC withstand voltage tests on the power collection submarine cables one by one, which is easy to consume a lot of time and manpower and leads to low efficiency in detecting the insulation performance of the power collection submarine cables.

[0115] It should be noted that the AC withstand voltage test system for power collection submarine cables is used for AC withstand voltage test of power collection submarine cables in offshore wind farms. The implementation process is as follows:

[0116] 1. Calculate the capacitance C of the entire cable from the length and parameters of each segment of the cable in the cable unit 100. Select a portable, compact, and easy-to-use reactor, and determine the number n of reactors in the first parallel reactor combination 440 and the number m of reactors in the second parallel reactor combination 450. According to the series-parallel resonance calculation formula: Calculate the resonant frequency f of the test circuit. Where: L1 is the inductance of the reactor of the first parallel reactor combination 440, and L2 is the inductance of the reactor of the second parallel reactor combination 450. Then, based on the output capacity of the variable frequency power supply 420 and the output capacity of the test transformer 430, the calculation formula is: Determine the parameters of the variable frequency power supply 420 and the test transformer 430. Where: U is the test voltage, and Q is the test circuit quality factor.

[0117] 2. Press each device of the resonance test equipment unit 400 Figure 2 The connections shown are complete. Specifically, three-phase AC power supply 4110 is connected to the input of variable frequency power supply 420, and the output of variable frequency power supply 420 is connected to the low-voltage side of test transformer 430. One high-voltage side of test transformer 430 is connected to the low-voltage side of first shunt reactor assembly 440, while the other high-voltage side of first shunt reactor assembly 440 is grounded. The high-voltage side of capacitor assembly 460 is connected to the high-voltage side of first shunt reactor assembly 440, while the low-voltage side of capacitor assembly 460 is grounded. Voltmeter 470 is connected in parallel with the low-voltage capacitor of capacitor divider 460, and the output of voltmeter 470 is connected to the input of communication controller 480. The output of communication controller 480 is connected to the communication terminal of variable frequency power supply 420. The high-voltage side of second shunt reactor assembly 450 is connected to the high-voltage side of first shunt reactor assembly 440, while the low-voltage side of second shunt reactor assembly 450 is grounded.

[0118] 3. Insert the terminal connector of the first collector cable 110 into the first cable incoming terminal socket 211, and the terminal connector of the second collector cable 120 into the first cable outgoing terminal socket 212. Ground the metal sheath and shielding leads of the terminal connectors. Close the first collector cable incoming disconnector 213, the first collector cable outgoing disconnector 214, and the first wind turbine booster busbar grounding switch 2112. Disconnect the first incoming grounding switch 218, the first collector cable outgoing grounding switch 219, the first wind turbine booster circuit breaker 2113, and the first wind turbine booster busbar disconnector 2111. Use a shorting wire to short-circuit the first collector cable incoming live indicator 215 and the first collector cable outgoing live indicator 216 to ground. Unplug the first incoming plug-in lightning arrester 217.

[0119] 4. Insert the other terminal connector of the second collector cable 120 into the second cable inlet terminal socket 221. Insert the terminal connector of the third collector cable 130 into the second cable outlet terminal socket 222. Ground the metal sheath and shielding leads of the terminal connectors. Close the second collector cable inlet disconnector 223, the second collector cable outlet disconnector 224, and the second wind turbine booster busbar grounding switch 2212. Disconnect the second inlet grounding switch 228, the second collector cable outlet grounding switch 229, the second wind turbine booster circuit breaker 2213, and the second wind turbine booster busbar disconnector 2211. Use a shorting wire to short-circuit the second collector cable inlet live indicator 225 and the second collector cable outlet live indicator 226 to ground. Unplug the second inlet plug-in lightning arrester 227.

[0120] 5. Insert the other terminal connector of the third collector submarine cable 130 into the third submarine cable incoming terminal socket 231 and ground the metal sheath and shielding leads of the terminal connector. Close the third collector submarine cable incoming line disconnector 232 and the third wind turbine booster busbar grounding switch 238. Disconnect the third incoming line grounding switch 235, the third wind turbine booster circuit breaker 239, and the third wind turbine booster busbar disconnector 237. Use a shorting wire to short-circuit the third incoming line live indicator 233 to ground. Unplug the third collector submarine cable incoming line lightning arrester 234.

[0121] 6. Insert the terminal connector of phase A of the first power collection submarine cable 110 on the offshore substation side into the test sleeve 310, ground phases B and C of the first power collection submarine cable 110, and ground the lead wires of the metal sheath layer and shield layer of the terminal connector.

[0122] 7. Use an insulation resistance tester to measure the insulation resistance of the first collector submarine cable 110 before the test.

[0123] 8. Use the test high-voltage wire 320 to connect the high-voltage end of the test bushing 310 and the high-voltage end of the first shunt reactor assembly 440.

[0124] 9. Turn on the power switch of variable frequency power supply 420, adjust the frequency of variable frequency power supply 420 to resonate the test circuit, increase the output voltage of variable frequency power supply 420 to raise the test voltage. When voltmeter 470 shows that the high voltage voltage is twice the rated voltage of the submarine cable, stop increasing the voltage and maintain it for 60 minutes. After the time is up, reduce the test voltage to zero and then turn off the power switch of variable frequency power supply 420.

[0125] 10. Use a discharge rod to fully discharge phase A of the first collector cable 110. Then measure the insulation resistance of phase A of the first collector cable 110 after the test and compare it with the insulation resistance value before the test measured in step 7. If there is no significant change in the insulation resistance values before and after the test, and no power generation occurs during the test, the withstand voltage test of phase A of the collector cable is considered to have passed. Otherwise, an insulation fault is determined to exist in phase A of the collector cable.

[0126] 11. Repeat steps 6 to 10 to complete the AC withstand voltage test of phases B and C of the collector submarine cable.

[0127] 12. It should also be noted that if a flashover, breakdown, or other discharge occurs during the test, the test must be stopped immediately and the collector cable and the resonant withstand voltage test equipment must be inspected for damage. If damaged, the test equipment must be replaced or the cable repaired, and steps 2 to 11 must be repeated until the test is complete.

[0128] At the same time, the series-parallel hybrid resonant withstand voltage test method adopted by the present invention can reduce the test main circuit current, as well as the output power of the test power supply and the excitation transformer, greatly reducing the volume and weight of the test equipment, and realizing the use of portable, small-capacity test equipment to conduct AC withstand voltage tests on collector submarine cables. It solves the problems of insufficient power supply capacity at the offshore test site and difficulty in transporting test equipment. The withstand voltage test system and method provided by the present invention achieve the goal of completing the withstand voltage test of all segmented submarine cables of the entire collector line in one test, which not only greatly shortens the test period, greatly improves work efficiency, but also saves manpower and material resources. The withstand voltage test equipment layout and test operation are all on the offshore booster station. Compared with the wind turbine, this test method is safe and reliable, greatly reduces the safety risks of offshore operations, and is suitable for offshore test sites. The withstand voltage test system and method provided by the present invention can also be applied to onshore wind power projects, which are highly practical and have great promotion and application value.

[0129] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0130] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0131] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0132] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0133] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0134] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0135] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A collector submarine cable AC withstand voltage test system, characterized in that: The system comprises: a resonance test equipment unit, a test tooling unit and a plurality of submarine cable high-voltage cabinet assembly units connected in sequence, each submarine cable high-voltage cabinet assembly unit comprising a power collection submarine cable unit and a wind turbine high-voltage cabinet equipment unit connected to the power collection submarine cable unit; The resonance test equipment unit is connected to the test fixture unit, and the test fixture unit is connected to the power collection submarine cable unit in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units; The resonance test equipment unit is used to perform an AC withstand voltage test on each of the power collection submarine cable units through the test fixture unit.

2. The system according to claim 1, wherein: The resonance test equipment unit includes a three-phase AC power supply, a variable frequency power supply, a test transformer, a first shunt reactor combination, a second shunt reactor combination, a capacitor combination, a voltmeter and a communication controller; The three-phase AC power supply is connected to the input end of the variable frequency power supply; the low-voltage side of the test transformer is connected to the output end of the variable frequency power supply, one end of the high-voltage side of the test transformer is connected to one end of the first parallel reactor combination, and the other end of the high-voltage side of the test transformer is grounded; the other end of the first parallel reactor combination is respectively connected to one end of the capacitor combination, one end of the second parallel reactor combination and one end of the test tooling unit; the other end of the capacitor combination and the other end of the second parallel reactor combination are both grounded, and the two ends of the low-voltage capacitor in the capacitor combination are connected to the voltmeter; the input end of the communication controller is connected to the output end of the voltmeter, and the output end of the communication controller is connected to the communication end of the variable frequency power supply.

3. The system according to claim 2, characterized in that The first shunt reactor combination and the second shunt reactor combination each include at least one reactor.

4. The system according to claim 2, wherein: The capacitor combination includes a high-voltage capacitor and the low-voltage capacitor; One end of the high-voltage capacitor is connected to the other end of the first shunt reactor combination, the other end of the high-voltage capacitor is connected to one end of the low-voltage capacitor, the other end of the low-voltage capacitor is grounded, and the voltmeter is connected to both ends of the low-voltage capacitor.

5. The system according to claim 1, wherein: The test fixture unit includes a test bushing and a test high-voltage conductor; One end of the test bushing is connected to the collecting submarine cable unit in the first submarine cable high-voltage cabinet assembly unit among the multiple submarine cable high-voltage cabinet assembly units, the other end of the test bushing is connected to one end of the test high-voltage wire, and the other end of the test high-voltage wire is connected to the resonance test equipment unit.

6. The system according to claim 5, characterized in that The test high-voltage conductor is a copper conductor passing through a corrugated tube.

7. The system according to claim 1, wherein: Both ends of the power collection submarine cable unit are terminal connectors; One terminal connector of the power collecting submarine cable unit in the first submarine cable high-voltage cabinet assembly unit is connected to the test tooling unit, and the other terminal connector is connected to the wind turbine high-voltage cabinet equipment unit in the first submarine cable high-voltage cabinet assembly unit.

8. The system according to claim 7, characterized in that The terminal connector includes lead wires from the cable sheath layer and the shielding layer; and the lead wires are all grounded.

9. The system according to claim 1, wherein: The wind turbine high-voltage cabinet equipment unit includes wind turbine electrical equipment, wind turbine step-up transformer, wind turbine step-up transformer circuit breaker, wind turbine step-up transformer busbar side grounding knife switch, wind turbine step-up transformer busbar side disconnector, busbar, submarine cable incoming side disconnector, submarine cable outgoing side disconnector, incoming side grounding knife switch, incoming plug-in lightning arrester, incoming side live display, submarine cable incoming terminal socket, outgoing side grounding knife switch, outgoing side live display, submarine cable outgoing terminal socket; The wind turbine electrical equipment is connected to one end of the wind turbine step-up transformer; one end of the wind turbine step-up transformer circuit breaker is connected to the other end of the wind turbine step-up transformer, and the other end of the wind turbine step-up transformer circuit breaker is respectively connected to one end of the wind turbine step-up transformer busbar side grounding knife switch and one end of the wind turbine step-up transformer busbar side disconnector; the other end of the wind turbine step-up transformer busbar side grounding knife switch is grounded; the other end of the wind turbine step-up transformer busbar side disconnector is connected to the busbar; one end of the busbar is connected to one end of the submarine cable incoming line side disconnector, and the other end of the busbar is connected to one end of the submarine cable outgoing line side disconnector; the other end of the submarine cable incoming line side disconnector is respectively connected to One end of the incoming line side grounding switch, the input end of the incoming line plug-in lightning arrester, the incoming line side live display and one end of the submarine cable incoming line terminal socket are connected; the other end of the incoming line side grounding switch and the output end of the incoming line plug-in lightning arrester are both grounded; the other end of the submarine cable incoming line terminal socket is connected to the power collection submarine cable unit corresponding to the wind turbine high-voltage cabinet equipment unit; the other end of the submarine cable outgoing line side disconnector is respectively connected to one end of the outgoing line side grounding switch, the outgoing line side live display and one end of the submarine cable outgoing line terminal socket; the other end of the outgoing line side grounding switch is grounded; the other end of the submarine cable outgoing line terminal socket is connected to the next power collection submarine cable unit.

10. The system according to any one of claims 1 to 9, characterized in that The system comprises at least two submarine cable high-voltage cabinet assembly units.

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