CN216720926U - Submarine cable protection device of offshore wind power alternating current sending-out system - Google Patents
Submarine cable protection device of offshore wind power alternating current sending-out system Download PDFInfo
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- CN216720926U CN216720926U CN202122577785.7U CN202122577785U CN216720926U CN 216720926 U CN216720926 U CN 216720926U CN 202122577785 U CN202122577785 U CN 202122577785U CN 216720926 U CN216720926 U CN 216720926U
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- submarine cable
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- cable protection
- transmission line
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Abstract
The utility model provides a submarine cable protection device of an offshore wind power alternating-current sending-out system, which is arranged on one side of a submarine cable transmission line close to a onshore centralized control center between an offshore booster station and the onshore centralized control center, the submarine cable protection device is connected with the submarine cable transmission line, the submarine cable protection device is provided with a grounding switch, a voltage transformer and a control protection device, and the grounding switch, the voltage transformer and the control protection device are respectively connected through signal transmission. The utility model is different from the traditional submarine cable energy consumption technology of manually closing the quick grounding switch, and utilizes the voltage transformer and the control protection device to detect that the submarine cable power transmission line still has higher voltage for a long time after the breaker is disconnected, and quickly closes the grounding switch in the submarine cable protection device, thereby realizing the automatic and quick release of the residual energy on the submarine cable.
Description
Technical Field
The utility model relates to the field of offshore wind power generation in renewable energy industry, in particular to a submarine cable protection device of an offshore wind power alternating current sending-out system.
Background
With the rapid development of global economy, the energy consumption is increasing day by day, and in order to deal with the problems of the gradual depletion of traditional energy and environmental pollution, all countries in the world accelerate the adjustment of energy structures, increase the supply of clean energy, and develop and utilize new energy such as wind energy. Compared with onshore wind power, offshore wind power has the remarkable advantages of high wind speed, high output, higher annual utilization hours and the like, and in addition, the offshore wind power does not occupy land resources and has small influence on the environment, so that the offshore wind power gradually becomes a new trend of the development of the wind power industry in China.
With the development of offshore wind power generation industry in China, the offshore wind power plant is more and more distant, and how to reliably and economically transmit the electric energy of the remote offshore wind power plant to the land becomes a key technical problem of offshore wind power development. For offshore wind farms, power needs to be transferred from the sea to the land through sea cables, and the sea cable lines have large capacitance compared to conventional overhead lines, so that long-distance sea cable lines may generate severe overvoltage. In order to suppress power frequency overvoltage, a high-voltage reactor device is usually connected in parallel on a cable, and after circuit breakers on two sides of a power transmission line trip, LC resonance may occur between the reactor and the ground capacitance of a submarine cable. Because the resistance of the submarine cable is small, the resonance energy cannot be consumed in a short time, if the resonance energy is not solved by adopting corresponding measures, the potential and the corresponding energy still exist on the circuit after the breaker is disconnected, and potential hazards are brought to the safety of equipment and operation and maintenance personnel. Therefore, the energy consumption device is additionally arranged on the submarine cable, and the submarine cable is operated after the two ends of the power transmission line are disconnected so as to release the resonance energy on the submarine cable, so that the submarine cable and the operation and maintenance personnel are protected, and the submarine cable has great significance for life safety.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a submarine cable protection device of an offshore wind power alternating current sending-out system. The utility model is different from the traditional submarine cable energy consumption technology of manually closing the quick grounding switch, and utilizes the voltage transformer and the control protection device to detect that the submarine cable power transmission line still has higher voltage for a long time after the breaker is disconnected, and quickly closes the grounding switch in the submarine cable protection device, thereby realizing the automatic and quick release of the residual energy on the submarine cable.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model provides a sea cable protection device of marine wind power alternating current system of seeing off which characterized in that: the submarine cable protection device is arranged on one side, close to the onshore centralized control center, of the submarine cable power transmission line between the offshore booster station and the onshore centralized control center, the submarine cable protection device is connected with the submarine cable power transmission line, the submarine cable protection device is provided with a grounding switch, a voltage transformer and a control protection device, the grounding switch, the voltage transformer and the control protection device are respectively connected through signal transmission, and the grounding switch is controlled to be opened and closed by the control protection device according to signals of the voltage transformer.
Further: the submarine cable protection device is provided with a voltage transformer, the voltage transformer is connected with a submarine cable power transmission line, and the voltage transformer is a detection device of the submarine cable protection device and is used for detecting the voltage at the joint of the submarine cable protection device and the submarine cable power transmission line.
Further: the submarine cable protection device is provided with a lightning arrester, and the lightning arrester is connected with a submarine cable power transmission line.
Further: the submarine cable protection device is provided with an electrified warning device, and the electrified warning device is connected with the power transmission line.
Further: two loops of submarine cable transmission lines are adopted for electric energy transmission, and submarine cable protection devices in each loop of submarine cable transmission line are completely the same.
Further: the grounding switch is connected with the submarine cable power transmission line, and the grounding switch provides an energy consumption loop for the circuit breakers at the two ends of the submarine cable power transmission line after tripping.
Further: the control protection device is used for monitoring the action state of a breaker switch on the side, close to the onshore centralized control center, of the submarine cable power transmission line.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
1. the utility model can be put into operation after the circuit breakers at the two ends of the submarine cable transmission line are tripped, and automatically and quickly releases the resonance energy generated by the ground capacitance of the submarine cable transmission line and the shunt reactor, thereby avoiding the large energy existing on the submarine cable transmission line for a long time and protecting the safety of the submarine cable.
2. The core of the utility model is that the grounding switch is utilized to timely release the residual resonance energy on the submarine cable transmission line, and no energy consumption devices such as a resistor and the like are added in the device, thereby avoiding the additional expenditure caused by adding a land device. Therefore, the utility model is more economical and practical.
Drawings
FIG. 1 is an electrical wiring schematic of the present invention;
FIG. 2 is a schematic diagram of a PSCAD/EMTDC simulation environment-based configuration for verifying validity of the present invention;
FIG. 3a is a simulated waveform diagram of the submarine-free protection device based on PSCAD/EMTDC simulation environment;
fig. 3b is a simulation waveform diagram after the submarine cable protection device is added based on the PSCAD/EMTDC simulation environment.
Reference numerals: 1-a grounding switch; 2-a control and protection device; 3-a voltage transformer; 4-a lightning arrester; 5-a live warning device; 6-a land centralized control center; 7-offshore booster station; 8-submarine cable transmission line; 9-circuit breaker.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with the specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the utility model.
The utility model is further illustrated by the following figures and examples, which are not to be construed as limiting the utility model.
As shown in fig. 1 to 3, the submarine cable protection device of the offshore wind power alternating current transmission system is arranged on the side, close to the onshore centralized control center 6, of a submarine cable transmission line 8 between an offshore booster station 7 and the onshore centralized control center 6, the submarine cable protection device is connected with the submarine cable transmission line 8, the submarine cable protection device is provided with a grounding switch 1, a voltage transformer 3 and a control protection device 2, the grounding switch 1, the voltage transformer 3 and the control protection device 2 are respectively connected through signal transmission, and the grounding switch is controlled to be opened and closed by the control protection device according to signals of the voltage transformer.
The voltage transformer 3 is connected with the submarine cable power transmission line 8 through a line, and the voltage transformer 3 is a detection device of the submarine cable protection device and is used for detecting the voltage at the joint of the submarine cable protection device and the submarine cable power transmission line 8.
The submarine cable protection device is provided with the lightning arrester 4, the lightning arrester 4 is in line connection with the submarine cable transmission line 8, the lightning arrester 4 is responsible for ensuring the safety of the submarine cable protection device and the submarine cable transmission line 8, and if the voltage of the submarine cable transmission line 8 exceeds a certain value, the lightning arrester 4 acts to release energy and inhibit line overvoltage.
Submarine cable protection device sets up electrified warning device 5, and electrified warning device 5 is connected with transmission line, and electrified warning device 5 is responsible for when the maintainer maintains, whether suggestion equipment is electrified, guarantee maintainer's personal safety.
The two loops of submarine cable transmission lines 8 are adopted for electric energy transmission, the reliability is higher, and submarine cable protection devices in the submarine cable transmission lines 8 in each loop are completely the same.
The grounding switch 1 is connected with the submarine cable power transmission line 8 through a line, and the grounding switch 1 provides an energy consumption loop for the circuit breakers 9 at two ends of the submarine cable power transmission line 8 after tripping.
The control protection device 2 is used for monitoring the switch action state of a breaker 9 on the side of the submarine cable power transmission line 8 close to the onshore centralized control center 6. When the control protection device 2 monitors that the circuit breaker 9 is tripped, after the time delay program delays for 0.1s, whether large voltage exists on the submarine cable power transmission line 8 or not is judged through the voltage transformer 3, if the large voltage exists, the grounding switch 1 in the submarine cable protection device is triggered to act, the grounding switch 1 is closed, residual voltage on the submarine cable is rapidly released, the submarine cable power transmission line 8 is prevented from being electrified for a long time, and the control protection device has great significance for protecting the life safety of the submarine cable power transmission line 8 and operation and maintenance personnel.
In the simulation of fig. 3a and 3b, the voltage measurement point is arranged at the end of the submarine cable near the onshore centralized control center 6, 0.16s of single-phase ground fault occurs on the submarine cable near the onshore centralized control center 6, and 0.21s of breakers 9 at the two ends of the submarine cable are simultaneously opened. As can be seen from fig. 3a, the submarine cable still has a large voltage after the breaker 9 is disconnected, and if the submarine cable protection device is not put into operation, the submarine cable is electrified for a long time, and the energy consumption is slow. As can be seen from fig. 3b, by putting the submarine cable protection device at 0.31s, the residual voltage on the submarine cable rapidly drops to 0 and the energy is released rapidly.
According to the description and the drawings of the utility model, a submarine cable protection device of an offshore wind power alternating current transmission system can be easily manufactured or used by a person skilled in the art, and the positive effects recorded in the utility model can be produced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The utility model provides a sea cable protection device of marine wind power alternating current system of seeing off which characterized in that: the submarine cable protection device is arranged on one side, close to the onshore centralized control center (6), of a submarine cable power transmission line (8) between the offshore booster station (7) and the onshore centralized control center (6), the submarine cable protection device is connected with the submarine cable power transmission line (8), the submarine cable protection device is provided with a grounding switch (1), a voltage transformer (3) and a control and protection device (2), the grounding switch (1), the voltage transformer (3) and the control and protection device (2) are respectively connected through signal transmission, and the grounding switch is controlled to be switched on and off by the control and protection device according to signals of the voltage transformer.
2. The sea cable protection device of an offshore wind power alternating current transmission system according to claim 1, characterized in that: the voltage transformer (3) is in line connection with the submarine cable power transmission line (8), and the voltage transformer (3) is a detection device of the submarine cable protection device and is used for detecting the voltage at the joint of the submarine cable protection device and the submarine cable power transmission line (8).
3. The sea cable protection device of an offshore wind power alternating current transmission system according to claim 1, characterized in that: the submarine cable protection device is provided with a lightning arrester (4), and the lightning arrester (4) is in line connection with a submarine cable power transmission line (8).
4. The sea cable protection device of an offshore wind power alternating current transmission system according to claim 1, characterized in that: the submarine cable protection device is provided with an electrified warning device (5), and the electrified warning device (5) is connected with the power transmission line.
5. The submarine cable protection device of offshore wind power alternating current transmission system according to claim 1, wherein: two loops of submarine cable transmission lines (8) are adopted for electric energy transmission, and submarine cable protection devices in each loop of submarine cable transmission lines (8) are completely the same.
6. The sea cable protection device of an offshore wind power alternating current transmission system according to claim 1, characterized in that: the grounding switch (1) is in line connection with the submarine cable power transmission line (8), and the grounding switch (1) provides an energy consumption loop for the circuit breakers (9) at the two ends of the submarine cable power transmission line (8) after tripping.
7. The sea cable protection device of an offshore wind power alternating current transmission system according to claim 1, characterized in that: the control protection device (2) is used for monitoring the switching action state of a breaker (9) on the side, close to the onshore centralized control center (6), of the submarine cable power transmission line (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122577785.7U CN216720926U (en) | 2021-10-26 | 2021-10-26 | Submarine cable protection device of offshore wind power alternating current sending-out system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122577785.7U CN216720926U (en) | 2021-10-26 | 2021-10-26 | Submarine cable protection device of offshore wind power alternating current sending-out system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216720926U true CN216720926U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122577785.7U Active CN216720926U (en) | 2021-10-26 | 2021-10-26 | Submarine cable protection device of offshore wind power alternating current sending-out system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216720926U (en) |
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2021
- 2021-10-26 CN CN202122577785.7U patent/CN216720926U/en active Active
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