Simulation system for long-distance transmission submarine cable characteristics

Abstract

The invention provides a simulation system for characteristics of a long-distance transmission submarine cable, and relates to the technical field of submarine cable simulation, and the simulation system comprises a first resistor, a fourth resistor, a first inductor, a first capacitor and a fifth switch. The first resistor and the first inductor are connected in series to form a first branch; the first capacitor and the fourth resistor are connected in parallel to form a second branch; the load and the fifth switch are connected in series with a third stroke branch; the second branch and the third branch are connected in parallel to form a fourth branch; the power supply is connected in series with the first branch and the fourth branch. The real laying state of the submarine cable is calculated and simulated according to different required voltage grades and submarine cable lengths, in a long-distance submarine cable transmission system, the submarine cable characteristic simulation system is adopted to simulate the characteristics of the real long-distance submarine cable, the cost is greatly reduced compared with that of the real submarine cable, flexible adjustment can be achieved according to needs, and the application range is wide. And a basis is provided for safety testing of long-distance submarine cable transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of submarine cable simulation, in particular to the field of submarine observation system, and particularly relates to a simulation system for long-distance transmission submarine cable characteristics. Background Art

[0002] At present, the cabled seabed observation system is formed by connecting a series of ocean observation instruments installed on fixed or mobile platforms on the seabed with shore-based information processing equipment using submarine optoelectronic composite cables. This system usually has the ability of underwater high-power remote transmission, large-scale data collection and information transmission, and can achieve large-scale, long-term, continuous and real-time observation from the seabed, seawater to the ocean interface. It is widely used in basic marine science research, theater and energy exploration and development, marine disaster warning, marine environmental protection and other aspects.

[0003] The oceanographic instruments of the cable observation system are all placed in the far sea area, and need to transmit power and information through long-distance submarine optical-electrical composite cables. The length of the submarine cable used is different, and its attenuation and impedance characteristics are also different. When using the power supply system to transmit power to remote instruments and equipment, its transient characteristics must be considered. Using actual submarine cables for testing is often limited by their large size and high cost.

[0004] Therefore, how to provide a simulation system for the characteristics of long-distance transmission submarine cables has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] The object of the present invention is to provide a simulation system for the characteristics of long-distance transmission submarine cables.

[0006] The present invention provides a simulation system for long-distance transmission submarine cable characteristics, where a shore power supply is connected to the simulation system to form a loop, and the system includes: a resistor, an inductor, a capacitor and a switch;

[0007] The resistor includes a first resistor and a fourth resistor;

[0008] The inductor comprises a first inductor;

[0009] The capacitor includes a first capacitor;

[0010] The switch includes a fifth switch;

[0011] The first resistor and the first inductor are connected in series to form a first branch;

[0012] The first capacitor and the fourth resistor are connected in parallel to form a second branch;

[0013] The load and the fifth switch are connected in series to the third branch;

[0014] The second branch is connected in parallel with the third branch to form a fourth branch;

[0015] The power supply is connected in series with the first branch and the fourth branch;

[0016] The resistance is the equivalent resistance value of the submarine cable per kilometer;

[0017] The inductance is the equivalent inductance per kilometer of submarine cable;

[0018] The capacitance is the equivalent capacitance value of the submarine cable per kilometer.

[0019] Optionally, the on-off of the fifth switch is controlled to simulate the influence of a surge in the submarine cable loop on the load when the load is powered on.

[0020] Optionally, when the system is powered on, the capacitor is charged, and when the system is powered off, the capacitor is discharged.

[0021] Optionally, the resistance characteristics of the submarine cable are determined by parameters of the submarine cable when it leaves the factory.

[0022] Optionally, the capacitance characteristic is related to the submarine cable structure and the insulation material, and the capacitance calculation formula is:

[0023]

[0024] Among them, ∈ is the relative dielectric constant of the submarine cable working capacitor insulation material, D is the outer diameter of the submarine cable insulation, and d is the inner diameter of the submarine cable insulation.

[0025] Optionally, the inductance calculation formula of the submarine cable is:

[0026]

[0027] Where, l is the length of the coaxial submarine cable, r1 is the inner radius of the submarine cable, r2 is the outer radius of the submarine cable, μ0 is the magnetic permeability of vacuum, and [H] is the unit of inductance.

[0028] Optionally, the submarine cable is a single-core coaxial insulated cable.

[0029] Optionally, the simulation system is used to simulate a DC single-core submarine cable.

[0030] Optionally, the resistor further includes a second resistor and a fifth resistor;

[0031] The inductor further includes a second inductor;

[0032] The capacitor also includes a second capacitor;

[0033] The switch further comprises a first switch and a third switch;

[0034] The second resistor is connected in parallel with the first switch to form a fifth branch, and the third switch is connected in parallel with the second inductor to form a sixth branch;

[0035] The second capacitor and the fifth resistor are connected in parallel to form a seventh branch;

[0036] The first resistor is sequentially connected in series with the fifth branch, the first inductor and the sixth branch to form an eighth branch;

[0037] The seventh branch is connected in series with the second branch and then connected in parallel with the third branch to form a ninth branch;

[0038] The power source is connected in series with the eighth branch and the ninth branch in sequence.

[0039] Optionally, the resistor further includes a third resistor and a sixth resistor;

[0040] The inductor further includes a third inductor;

[0041] The capacitor further includes a third capacitor;

[0042] The switch further comprises a second switch and a fourth switch;

[0043] The second switch is connected in parallel with the third resistor to form a tenth branch, and the fourth switch is connected in parallel with the third inductor to form an eleventh branch;

[0044] The sixth resistor and the third capacitor are connected in parallel to form a twelfth branch;

[0045] The first resistor is sequentially connected in series with the fifth branch, the tenth branch, the first inductor, the sixth branch and the eleventh branch to form a thirteenth branch;

[0046] The seventh branch is connected in series with the second branch and the twelfth branch in sequence and then connected in parallel with the third branch to form a fourteenth branch;

[0047] The power source is connected in series with the thirteenth branch and the fourteenth branch in sequence.

[0048] It can be seen from the above scheme that the embodiment of the present invention provides a simulation system for the characteristics of long-distance transmission submarine cables, which has the following beneficial effects:

[0049] In a long-distance submarine cable transmission system, when the power supply system transmits power to remote instruments and equipment, the instantaneous surge may affect the remote equipment. If an actual submarine cable is used for testing, it can only be judged by observing the changes in the close-range load. Using this submarine cable characteristic simulation method, the characteristics of a real long-distance submarine cable can be simulated. Its installation is simple, the cost is greatly reduced compared to the real submarine cable, and it can be flexibly adjusted according to needs, providing a basis for the safety test of long-distance submarine cable transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic diagram of a first solution of a simulation system for long-distance transmission submarine cable characteristics provided according to an embodiment;

[0051] Figure 2 A schematic diagram of a second solution of a simulation system for long-distance transmission submarine cable characteristics provided according to an embodiment;

[0052] Figure 3 It is a schematic diagram of a third scheme of a simulation system for long-distance transmission submarine cable characteristics provided according to an embodiment.

[0053] Reference numerals

[0054] R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, S1-first switch, S2-second switch, S3-third switch, S4-fourth switch, S5-fifth switch, L1-first inductor, L2-second inductor, L3-third inductor, C1-first capacitor, C2-second capacitor, C3-third capacitor. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The present application provides a simulation system for the characteristics of long-distance transmission submarine cables. According to the required different voltage levels and submarine cable lengths, the simulation system is used to simulate the actual laying state of the submarine cable. The shore power supply is connected to the simulation system to form a loop, such as Figure 1As shown, the system includes: a resistor, an inductor, a capacitor and a switch; the resistor includes a first resistor R1 and a fourth resistor R4; the inductor includes a first inductor L1; the capacitor includes a first capacitor C1; the switch includes a fifth switch S5; the first resistor R1 and the first inductor L1 are connected in series to form a first branch; the first capacitor C1 and the fourth resistor R4 are connected in parallel to form a second branch; the load and the fifth switch S5 are connected in series to form a third branch; the second branch and the third branch are connected in parallel to form a fourth branch; the power supply is connected in series with the first branch and the fourth branch; the resistor is the equivalent resistance value of each kilometer of the submarine cable; the inductor is the equivalent inductance value of each kilometer of the submarine cable; the capacitor is the equivalent capacitance value of each kilometer of the submarine cable. The on and off of the fifth switch S5 is controlled to simulate the impact of the surge in the submarine cable loop on the load at the moment when the load is powered on. When the system is powered on, the capacitor is charged, and when the system is powered off, the capacitor is discharged. The submarine cable is a single-core coaxial insulated cable, and the resistance characteristics of the submarine cable are determined by the parameters of the submarine cable when it leaves the factory.

[0057] The capacitance characteristics are related to the structure and insulation material of the submarine cable, and the capacitance calculation formula is:

[0058]

[0059] Among them, ∈ is the relative dielectric constant of the submarine cable working capacitor insulation material, D is the outer diameter of the submarine cable insulation, and d is the inner diameter of the submarine cable insulation.

[0060] The calculation formula of the inductance of the submarine cable is:

[0061]

[0062] Where, l is the length of the coaxial submarine cable, r1 is the inner radius of the submarine cable, r2 is the outer radius of the submarine cable, μ0 is the magnetic permeability of vacuum, [H] is the unit of inductance, and its Chinese name is Henry.

[0063] In some specific embodiments, Figure 2 As shown, the resistor also includes a second resistor R2 and a fifth resistor R5; the inductor also includes a second inductor L2; the capacitor also includes a second capacitor C2; the switch also includes a first switch S1 and a third switch S3; the second resistor R2 is connected in parallel with the first switch S1 to form a fifth branch, and the third switch S3 is connected in parallel with the second inductor L2 to form a sixth branch; the second capacitor C2 is connected in parallel with the fifth resistor R5 to form a seventh branch; the first resistor R1 is connected in series with the fifth branch, the first inductor L1 and the sixth branch in sequence to form an eighth branch; the seventh branch is connected in series with the second branch and then in parallel with the third branch to form a ninth branch; the power supply is connected in series with the eighth branch and the ninth branch in sequence.

[0064] Furthermore, in some of the illustrated embodiments, Figure 3As shown, the resistor also includes a third resistor R3 and a sixth resistor R6; the inductor also includes a third inductor L3; the capacitor also includes a third capacitor C3; the switch also includes a second switch S2 and a fourth switch S4; the second switch S2 is connected in parallel with the third resistor R3 to form a tenth branch, and the fourth switch S4 is connected in parallel with the third inductor L3 to form an eleventh branch; the sixth resistor R6 is connected in parallel with the third capacitor C3 to form a twelfth branch; the first resistor R1 is connected in series with the fifth branch, the tenth branch, the first inductor L1, the sixth branch and the eleventh branch in sequence to form a thirteenth branch; the seventh branch is connected in series with the second branch and the twelfth branch in sequence and then connected in parallel with the third branch to form a fourteenth branch; the power supply is connected in series with the thirteenth branch and the fourteenth branch in sequence.

[0065] Among them, R1, R2, R3, R4, R5, and R6 are all resistors, and their values ​​are the actual DC resistance values ​​of the submarine cable per kilometer, and the values ​​are determined by the DC resistance parameters of the submarine cable when it leaves the factory; L1, L2, and L3 are all inductors, and their values ​​are the actual inductance values ​​of the submarine cable per kilometer, and the values ​​are calculated based on the submarine cable parameters; C1, C2, and C3 are all capacitors, and their values ​​are the actual capacitance values ​​of the submarine cable per kilometer, and the values ​​are calculated based on the submarine cable parameters.

[0066] The simulation system of the present application can simulate the resistance characteristics, capacitance characteristics, and inductance characteristics between long-distance transmission cables. As shown in the figure, the simulation system simulates a DC single-core cable, and the shore-side power supply is connected to the simulation system to form a loop. A single resistor R, inductor L, and capacitor C represent the equivalent resistance, inductance, and capacitance of each kilometer of submarine cable, respectively, and their values ​​are obtained through field parameters and calculations. Due to the high voltage level of the long-distance submarine cable transmission system, the capacitor adopts a series structure, and each capacitor is connected in parallel with a resistor to equalize the voltage for each capacitor. When the system is powered on, the capacitor is charged, and when the system is powered off, the capacitor discharges it. When the switches S are all closed, the simulator connects to R1 and L1 to simulate the impedance characteristic parameters of the submarine cable when connecting to a 1-kilometer submarine cable.

[0067] According to the actual situation of the system, the number of resistors and inductors can be increased to simulate the actual submarine cable laying situation; or the parameters of resistors and inductors can be changed to simulate the long-distance submarine cable transmission system. By controlling the on and off of switch S5, the impact of the surge in the submarine cable loop on the load at the moment of powering on the load can be simulated.

[0068] This application simulates the resistance, capacitance and inductance characteristics of submarine cables, which have an important impact on long-distance submarine cable systems.

[0069] Among them, the resistance characteristics of the submarine cable are determined by the parameters of the submarine cable when it leaves the factory; the capacitance characteristics are related to the structure and insulation materials of the submarine cable.

[0070] The calculation formula is ∈ is the relative dielectric constant of the cable working capacitance insulation material, D is the cable insulation outer diameter, and d is the cable insulation inner diameter;

[0071] The inductance calculation formula of single-core coaxial insulated submarine cable is: l is the length of the coaxial cable, r1 is the inner radius of the cable, r2 is the outer radius of the cable, and μ0 is the magnetic permeability of vacuum.

[0072] In summary, in a long-distance submarine cable transmission system, when the power supply system transmits power to remote instruments and equipment, the instantaneous surge may affect the remote equipment. If an actual submarine cable is used for testing, it can only be judged by observing the changes in the close-range load. Using this submarine cable characteristic simulation method, the characteristics of a real long-distance submarine cable can be simulated. Its installation is simple, the cost is greatly reduced compared to the real submarine cable, and it can be flexibly adjusted according to needs, providing a basis for the safety test of long-distance submarine cable transmission.

[0073] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A simulation system for long-distance transmission submarine cable characteristics, connecting shore power supply to the simulation system to form a loop, characterized in that: The system includes: a resistor, an inductor, a capacitor and a switch; The resistor includes a first resistor and a fourth resistor; The inductor comprises a first inductor; The capacitor includes a first capacitor; The switch includes a fifth switch; The first resistor and the first inductor are connected in series to form a first branch; The first capacitor and the fourth resistor are connected in parallel to form a second branch; The load and the fifth switch are connected in series to the third branch; The second branch is connected in parallel with the third branch to form a fourth branch; The power supply is connected in series with the first branch and the fourth branch; The resistance is the equivalent resistance value of the submarine cable per kilometer; The inductance is the equivalent inductance per kilometer of submarine cable; The capacitance is the equivalent capacitance value of the submarine cable per kilometer.

2. The simulation system for long-distance transmission submarine cable characteristics according to claim 1, characterized in that: The on and off of the fifth switch is controlled to simulate the influence of the surge in the submarine cable loop on the load when the load is powered on.

3. The simulation system for long-distance transmission submarine cable characteristics according to claim 2, characterized in that: When the system is powered on, the capacitor is charged, and when the system is powered off, the capacitor is discharged.

4. The simulation system for long-distance transmission submarine cable characteristics according to claim 3, characterized in that: The resistance characteristics of the submarine cable are determined by the parameters of the submarine cable when it leaves the factory.

5. The simulation system for long-distance transmission submarine cable characteristics according to claim 4, characterized in that: The capacitance characteristics are related to the structure and insulation material of the submarine cable. The capacitance calculation formula is: Among them, ∈ is the relative dielectric constant of the submarine cable working capacitor insulation material, D is the outer diameter of the submarine cable insulation, and d is the inner diameter of the submarine cable insulation.

6. The simulation system for long-distance transmission submarine cable characteristics according to claim 5, characterized in that: The calculation formula of the inductance of the submarine cable is: Where, l is the length of the coaxial submarine cable, r1 is the inner radius of the submarine cable, r2 is the outer radius of the submarine cable, μ0 is the magnetic permeability of vacuum, and [H] is the unit of inductance.

7. The simulation system for long-distance transmission submarine cable characteristics according to claim 6, characterized in that: The submarine cable is a single-core coaxial insulated cable.

8. The simulation system for long-distance transmission submarine cable characteristics according to claim 7, characterized in that: The simulation system is used to simulate a DC single-core submarine cable.

9. The simulation system for long-distance transmission submarine cable characteristics according to any one of claims 1 to 8, characterized in that: The resistor also includes a second resistor and a fifth resistor; The inductor further includes a second inductor; The capacitor also includes a second capacitor; The switch further comprises a first switch and a third switch; The second resistor is connected in parallel with the first switch to form a fifth branch, and the third switch is connected in parallel with the second inductor to form a sixth branch; The second capacitor and the fifth resistor are connected in parallel to form a seventh branch; The first resistor is sequentially connected in series with the fifth branch, the first inductor and the sixth branch to form an eighth branch; The seventh branch is connected in series with the second branch and then connected in parallel with the third branch to form a ninth branch; The power source is connected in series with the eighth branch and the ninth branch in sequence.

10. The simulation system for long-distance transmission submarine cable characteristics according to claim 9, characterized in that: The resistor also includes a third resistor and a sixth resistor; The inductor further includes a third inductor; The capacitor further includes a third capacitor; The switch further includes a second switch and a fourth switch; The second switch is connected in parallel with the third resistor to form a tenth branch, and the fourth switch is connected in parallel with the third inductor to form an eleventh branch; The sixth resistor and the third capacitor are connected in parallel to form a twelfth branch; The first resistor is sequentially connected in series with the fifth branch, the tenth branch, the first inductor, the sixth branch and the eleventh branch to form a thirteenth branch; The seventh branch is connected in series with the second branch and the twelfth branch in sequence and then connected in parallel with the third branch to form a fourteenth branch; The power source is connected in series with the thirteenth branch and the fourteenth branch in sequence.

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