CN214479581U

CN214479581U - Line protection system

Info

Publication number: CN214479581U
Application number: CN202022479973.1U
Authority: CN
Inventors: 杨林慧; 孙少华; 杨兴; 何晶; 方晨; 刘生成; 李海龙
Original assignee: State Grid Corp of China SGCC; State Grid Qinghai Electric Power Co Ltd; Information and Telecommunication Branch of State Grid Qinghai Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Qinghai Electric Power Co Ltd; Information and Telecommunication Branch of State Grid Qinghai Electric Power Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-10-22
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a line protection system. Wherein, this system includes: the system comprises line protection equipment, switching equipment, a transmission system, a line switch and monitored lines, wherein the line protection equipment is connected with the monitored lines; the switching equipment is directly connected with the line protection equipment through optical fibers, and can switch the transmission system which can be normally used under the condition that the current transmission system has a fault; the transmission systems are multiple and are connected with the switching equipment and the line switch; the line switch is installed on the monitored line, and disconnects the monitored line according to the received fault report. The utility model provides a line protection device among the correlation technique, the reliability is poor, the technical problem of unable effective transmission fault information when the circuit trouble.

Description

Line protection system

Technical Field

The utility model relates to a power grid protection field particularly, relates to a line protection system.

Background

The power system is continuously developing towards the direction of modernization, high voltage and large units, and a high-voltage transmission line with the voltage of more than 220kv becomes a main line of power transmission. Because the transmission capacity of the power transmission line is large, the voltage is high, the power supply range is wide, the influence on national energy safety and people life is more and more large, once faults and accidents occur, the life and property safety of national people can be endangered, and therefore the power transmission line with the faults needs to be timely and accurately cut off by applying a relay protection facility.

In view of the above problems, no effective solution has been proposed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a line protection system to solve line protection device in the correlation technique at least, the reliability is poor, can't effectively transmit fault information's technical problem when the circuit trouble.

According to an aspect of the embodiments of the present invention, there is provided a line protection system, including: the system comprises line protection equipment, switching equipment, a transmission system and a line switch, wherein the line protection equipment is connected with a monitored line; the switching equipment is directly connected with the line protection equipment through optical fibers, and the transmission system which can be normally used is switched under the condition that the current transmission system has a fault; the transmission systems are multiple and are connected with the switching equipment and the line switch; the line switch is installed on the monitored line, and disconnects the monitored line according to the received fault report.

Optionally, the line protection device and the switching device are in different equipment rooms, and the line protection device is in direct communication connection with the switching device through an optical fiber.

Optionally, the line protection device and the switching device are both provided with an optical fiber interface for installing and connecting an optical fiber.

Optionally, the optical fiber interface is a 2M optical fiber interface.

Optionally, the method further includes: the circuit protection device comprises a first power supply device and a second power supply, wherein the first power supply comprises two independent power supplies and is used for providing dual power supplies for the circuit protection device; the second power supply comprises two independent power supplies for providing dual power supply for the switching device.

Optionally, the switching device is further connected to a gateway device, and is configured to monitor data transmitted to the switching device by the transmission system.

Optionally, the line switch is a substation switch at two ends of the monitored line conveyor, and the line protection device is connected to the pilot protection interface devices at two ends of the monitored line conveyor.

Optionally, the line protection device is a line relay protection device.

Optionally, the line protection device sends an alarm when acquiring the fault report of the monitored line.

Optionally, the transmission system is an SDH optical transmission system.

In the embodiment of the utility model, the line protection equipment, the switching equipment, the transmission system, the line switch and the line protection equipment are connected with the monitored line; the switching equipment is directly connected with the line protection equipment through optical fibers, and can switch the transmission system which can be normally used under the condition that the current transmission system has a fault; the transmission systems are multiple and are connected with the switching equipment and the line switch; the line switch is installed on a monitored line, the mode of the monitored line is disconnected according to the received fault report, the plurality of transmission systems are parallel, the normal transmission systems are switched to transmit the fault report when the transmission systems are in fault, and the purpose of effectively transmitting the line fault report is achieved, so that the technical effects of improving the reliability and the transmission efficiency of the fault information transmission of line faults are achieved, and the technical problems that a line protection device in the related technology is poor in reliability and cannot effectively transmit fault information when the line faults occur are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic diagram of a line protection system according to an embodiment of the present invention;

fig. 2 is a flow chart of a line protection method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a line electro-mechanical protection system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a line protection communication connection according to an embodiment of the present invention;

fig. 5 is a schematic diagram of another line protection communication connection according to an embodiment of the present invention;

fig. 6 is a schematic diagram of another line protection communication connection according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another line protection communication connection according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a switching device and a service interface according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a line protection device according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic diagram of a line protection system according to an embodiment of the present invention, as shown in fig. 1, according to an aspect of the embodiment of the present invention, there is provided a line protection system, including: the system comprises line protection equipment 12, switching equipment 14, a transmission system 16 and a line switch 18, wherein the line protection equipment 12 is connected with a monitored line; the switching device 14 is directly connected with the line protection device 12 through an optical fiber, and switches the transmission system 16 which can be normally used under the condition that the current transmission system 16 has a fault; the transmission systems 16 are multiple, and the multiple transmission systems 16 are all connected with the switching device 14 and the line switch 18; the line switch 18 is installed on the monitored line and disconnects the monitored line upon receiving a fault report.

According to the system, line protection equipment, switching equipment, a transmission system and a line switch are adopted, and the line protection equipment is connected with a monitored line; the switching equipment is directly connected with the line protection equipment through optical fibers, and can switch the transmission system which can be normally used under the condition that the current transmission system has a fault; the transmission systems are multiple and are connected with the switching equipment and the line switch; the line switch is installed on a monitored line, the mode of the monitored line is disconnected according to the received fault report, the plurality of transmission systems are parallel, the normal transmission systems are switched to transmit the fault report when the transmission systems are in fault, and the purpose of effectively transmitting the line fault report is achieved, so that the technical effects of improving the reliability and the transmission efficiency of the fault information transmission of line faults are achieved, and the technical problems that a line protection device in the related technology is poor in reliability and cannot effectively transmit fault information when the line faults occur are solved.

In the related art, a photoelectric conversion module is arranged between the line protection device and the switching device, and is managed by a third-party department, so that the line protection device and the switching device cannot effectively communicate when a fault occurs, and a fault report cannot be effectively transmitted naturally, therefore, the line protection device is directly connected with the switching device through an optical fiber, the probability of the fault can be reduced to a certain extent, and the stability and the effectiveness of fault report transmission are improved.

Optionally, the line protection device and the switching device are both provided with optical fiber interfaces for installing and connecting optical fibers.

The optical fiber interfaces are required to be used for direct communication connection through the optical fibers, and the optical fiber interfaces are arranged on the line protection equipment and the switching equipment and are used for installing the optical fibers for direct communication, so that the stability and effectiveness of fault report transmission are ensured.

Optionally, the optical fiber interface is a 2M optical fiber interface. The optical fiber interface is an optical fiber interface with a bandwidth of 2M, is an optical fiber bandwidth commonly used in power communication, can meet the communication of power information, and also prevents the occupation of too many communication resources of optical fibers in a communication network.

Optionally, the method further includes: the first power supply comprises two independent power supplies and is used for providing dual power supplies for the line protection equipment; the second power supply comprises two independent power supplies for providing dual power supplies for the switching device.

The dual power supplies can guarantee normal power supply to the system, and when one power supply fails, the system is switched to the other power supply, and a fault alarm is sent to the related management terminal, so that normal work of the system is guaranteed under the condition that the power supply fails suddenly, and the stability of fault report transmission is further improved.

The gateway equipment can monitor the data transmitted to the switching equipment, and the safety and reliability of data transmission between the switching equipment and the transmission system are guaranteed.

Optionally, the line switch is a transformer substation switch at two ends of the monitored line, and the line protection device is connected with the pilot protection interface devices at two ends of the monitored line.

The line switch is arranged at a transformer substation, namely a transformer substation switch, a monitored line is erected between two transformer substations, the line switch is arranged at the transformer substation, the space of the line switch arranged at other positions can be saved, and the line switch is convenient to maintain together with the transformer substation.

Optionally, the line protection device is a line relay protection device. The on-off of the monitored line can be effectively executed.

Optionally, the line protection device sends an alarm when acquiring a fault report of the monitored line. And when the fault report is sent, the line protection equipment can also send an alarm to the control terminal, and the control terminal is informed to carry out related maintenance operation.

Optionally, the transmission system is an SDH optical transmission system. The Synchronous Digital Hierarchy (SDH) optical transmission system is a comprehensive information transmission network which integrates multiplexing, line transmission and switching functions and agrees with the operation of a crown system, can realize effective network management, can realize real-time service monitoring, can realize dynamic network maintenance, has multiple functions of intercommunication among different manufacturer devices and the like, and has the advantages of reliable data transmission and flexible use.

In accordance with an embodiment of the present invention, there is provided a method embodiment of a method for processing grid data, where the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that illustrated.

Fig. 2 is a flowchart of a line protection method according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:

step S202, collecting fault data of the line;

step S204, transmitting the fault data to the switching equipment;

and step S206, the switching equipment switches the transmission systems to send the fault data to the monitoring end, wherein the number of the transmission systems is multiple, the transmission systems are all in communication connection with the switching equipment, and the monitoring maintains the line according to the fault data.

Through the steps, fault data of the collected line are adopted; transmitting the fault data to the switching device; switching equipment switches transmission system and sends trouble data to control end, wherein, transmission system is a plurality of, a plurality of transmission system all with switching equipment communication connection, the mode that the control was maintained the circuit according to trouble data, it is parallel through a plurality of transmission system, switch over normal transmission system and carry out the transmission of fault report when transmission system trouble, the purpose of guaranteeing to carry out effective transmission to the circuit fault report has been reached, thereby realized improving the technical effect of the reliability and the transmission efficiency of the fault information transmission of circuit trouble, and then solved the line protection device among the relevant art, the reliability is poor, can't effectively transmit the technical problem of fault information when the circuit trouble.

Optionally, before the switching device switches the transmission system to send the fault data to the monitoring terminal, the method further includes: receiving fault information sent by a transmission system in use; and switching the transmission system in use to the transmission system capable of being normally used according to the fault information.

Optionally, before transmitting the failure data to the switching device, the method further includes: connected directly to the switching device by optical fibres.

It should be noted that the present application also provides an alternative implementation, and the details of the implementation are described below.

Electric wire netting alternating current-direct current special high voltage line, high tension transmission line both ends all dispose circuit relay protection device, and these circuit protection devices all need real-time reliable intercommunication of each other, and 2M service channel in SDH optical transmission equipment is used to present general communication channel, and figure 3 is according to the utility model discloses embodiment's circuit electromechanical protection system's schematic diagram specifically is shown as figure 3. Once the relay protection devices at the two ends of the line detect the line fault, a switch cut-off instruction is sent in the shortest time, the protected line is isolated from the power grid, the power transmission line is protected to the greatest extent, and the expansion of the accident loss is avoided.

The communication modes of the optical fiber protection device of the AC line currently use 4 types: the optical fiber direct connection mode, the 2M multiplexing mode, the 2M switching equipment mode and the 2M optical port mode.

Mode 1, optical fiber is directly connected, and this mode is widely used. The optical fiber protection with the line distance less than 50KM generally adopts optical fiber direct connection, and the mode has the advantages of simplicity and reliability and has the defect of excessive occupation of optical fiber resources.

Mode

2, 2M multiplexing, which is widely used. Fig. 4 is a schematic diagram of a line protection communication connection according to the embodiment of the present invention, as shown in fig. 4, the line relay protection device and the communication equipment are generally not in the same machine room, and are connected through the indoor optical fiber therebetween, after the optical fiber reaches the communication machine room, the optical signal is converted into a 2M electrical signal through the photoelectric conversion box (MUX2M), and the 2M electrical signal is transmitted to the opposite end station through the SDH optical transmission system.

Mode 3, 2M switching equipment mode, this mode has some province's electric wire netting to become to build and make batch application, and the effect is reverberated well. The line relay protection device can work only when the communication is normal, and once the communication fails, the relay protection device needs to be locked immediately and quit the operation. Generally, each line is provided with two sets of relay protection devices to operate simultaneously (each set of relay protection device is provided with 2 relay protection devices with point to point), and once the two sets of relay protection devices are all withdrawn, the line must be forcibly withdrawn from power transmission operation.

Fig. 5 is a schematic diagram of another line protection communication connection according to the embodiment of the present invention, as shown in fig. 5, the power grid communication service serves the power generation service, the power grid has a large number of single-channel 2M multiplexing protection devices operating on the power grid, and for the reliability of the power grid operation, the high reliability of the communication service must be ensured, so the power communication network has multiple sets of SDH transmission networks. The 2M switching equipment intelligently selects one set of the two sets of SDH transmission networks as a transmission route of the 2M service. The 2M switching equipment is typically applied to relay protection communication services.

In fig. 5, normally, 2Ma is used as the main channel, but when a set of SDH fails, 2Ma generates a corresponding alarm, the 2M switching device automatically switches the service channel to 2Mb, and the relay protection communication service continues to operate normally using a set of SDH transmission systems B. Therefore, the reliability of the communication service of the relay protection device is guaranteed, and the operation safety of the power grid is improved.

In the mode 3, the photoelectric conversion box and the 2M switching device are two different devices belonging to different management departments of the power grid for management, and in the modes 2 and 3, the photoelectric conversion box becomes a fault point, so that the network management cannot be centralized, the maintenance is inconvenient, and the operation safety of the power grid is influenced.

Mode 4, 2M optical port direct connection mode. Fig. 6 is a schematic diagram of another line protection communication connection according to the embodiment of the present invention, as shown in fig. 6, a 2M optical interface is added to the SDH device to be directly connected to the 2M optical interface of the relay protection device, so that an optical/electrical switching box device (MUX2M) in the communication room is omitted, a certain reliability is increased, and an optical fiber resource is saved.

The method 4 is suitable for newly-built lines, the new relay protection devices are AB ports and have double routes, and SDH equipment has standard 2M optical interfaces. For old sites, neither the relay protection device nor the SDH equipment has a standard 2M optical interface, and the method 4 cannot be implemented.

Compared with the 4 communication modes of the relay protection device, the mode 3 is better for the existing single-channel relay protection device with a large number of channels, and the reliability of the power grid is greatly improved. However, the photoelectric conversion box in the mode 3 is only powered by a single power supply, and cannot remotely centralize network management, which is a common fault point.

The implementation mode cooperates with a 2M switching equipment manufacturer, the manufacturer carries out technical development, and an optical interface is added to the 2M switching equipment to be directly connected with the relay protection device. Fig. 7 is a schematic diagram of another line protection communication connection according to the embodiment of the present invention, as shown in fig. 7, two devices, namely, the 2M switching device and the photoelectric conversion box in the communication machine room of fig. 3 are actually combined into one, so that the photoelectric conversion box is reduced, the route switching of the channel 1+1 is also solved, and meanwhile, the network management system can be remotely centralized. The method has great significance for safe and stable operation of the relay protection device.

In the embodiment, only the optical interface module is required to be added on the 2M switching device, the hardware cost is slightly increased, but a set of MUX2M equipment is omitted, and the 2M switching device is still a 1U19 inch case after the optical interface is added on the 2M switching device, so that centralized and unified network management can be realized, and the operation and maintenance are convenient. As long as the communication department is coordinated and matched with the protection department, the method is easy to popularize and apply in each provincial network of the national power grid.

With the increasing number of relay protection services carried by a single optical fiber, 2M switching devices have gradually gained high attention from the national grid communication management department in recent years, and for a large number of currently-operated single-channel relay protection devices, the addition of 2M switching devices is the best solution.

The optical port is arranged in the 2M switching device, so that the MUX2M device is removed, and no unit research application exists at present.

The problem of high failure rate and maintenance blind spot of active equipment in a communication section from protection equipment to switching equipment in a mode 3 is solved by newly developing a switching equipment (hereinafter referred to as a new switching equipment) with an optical interface, wherein the switching equipment is provided with one path of optical interface and two paths of electrical interfaces, services transmitted by the three paths of interfaces are 2M data communication services of a relay protection device, the two paths of electrical interfaces are respectively connected with two 2M transmission channels with independent routes in a transmission network, one path of optical interface is directly connected with the optical interface of a relay protection device, and the switching equipment is provided with a transmission side 2-path communication link switching function, namely, one path of optical interface can be selected from two paths of transmission links to transmit the relay protection 2M data communication services, the transmission performance of a service transmission link can be monitored in real time, and once failure or performance deterioration is found, link switching is immediately carried out according to a preset strategy, therefore, the influence on relay protection communication service is reduced to the minimum.

The new switching equipment transforms the 2M electrical interface used for connecting the relay protection device in the original device into an optical interface on the basis of the original switching equipment, and the optical interface is directly connected with the relay protection device in an optical medium communication mode, so that a middle photoelectric conversion device is omitted, a fault point is reduced, and the problems of high fault rate and maintenance blind point of the communication section are solved by means of high reliability and high maintainability of the switching equipment.

In order to adapt to the current application situation of a relay protection device, an optical interface of new switching equipment needs to be compatible with the current domestic mainstream relay protection device, physical and link layer rules such as a line coding mode, a timing synchronization mode, a level judgment rule, a channel error correction coding mode and the like of a communication interface of the mainstream relay protection device are researched, an optical communication interface module corresponding to the optical communication interface module is developed, and the optical interface module is butted with the relay protection device on the premise of not changing the original relay protection device to complete the photoelectric conversion function of the original photoelectric conversion device, so that relay protection communication services can be conveniently and smoothly transferred to the new switching equipment.

The optical communication is widely applied due to the characteristics of high communication speed, strong anti-interference capability, long transmission distance, low cost and high reliability, and is a poor choice especially in high electromagnetic pollution environments.

The code stream to be transmitted in the digital communication system is generally an NRZ code, and in order to adapt to the transmission characteristics of the communication medium, the NRZ code needs to be converted into a digital code stream suitable for channel transmission, which is a process of line coding.

In digital optical communication, the principle of simple and low cost is generally adopted for baseband digital transmission, and meanwhile, the optical fiber transmission characteristic and the receiving and judging regeneration characteristics of an optical receiving device are considered, so that optical communication line coding must meet the requirements of limiting signal bandwidth, reducing high and low frequency components of power spectral density, providing rich timing synchronization information and providing auxiliary communication bandwidth.

There are many types of optical communication line codes, and two types of optical communication line codes are the most common, one is a block code mBnB, and the other is an inserted bit code mB 1X.

The grouping conversion code mBnB groups the communication payload content into a group according to m bits, and then maps each group into a binary code group of n (more than m) bits according to a certain rule. The mapping rule follows that the occurrence probability of the code elements of 0 and 1 in the transformed code group is equal; the number of the connection '0' and the connection '1' is reduced, the number of the connection '0' and the connection '1' cannot exceed m-1 bits, timing information is rich, and timing and regeneration of a clock are facilitated; the power spectral density has less high and low frequency components and small baseline drift; and a certain redundancy is introduced into the code stream, so that error code detection and auxiliary communication are facilitated.

Inserting a bit code mB1X, grouping the communication payload code streams into a group according to m bits, and then inserting a code word X into the back of each group according to a certain rule to form a line code stream with m +1 bits as a group.

As can be seen from the conversion method of line coding, both the packet conversion code mB nb and the inserted bit code mB1X trade off the communication performance for the communication bandwidth increase and the communication efficiency sacrifice, which are almost negligible in the low-speed optical communication system.

Fig. 8 is a schematic diagram of a switching device and a service interface according to an embodiment of the present invention, as shown in fig. 8, after an optical interface is added inside a 2M switching device, the following objectives will be achieved:

1. the MUX2M equipment is removed, so that the number of fault nodes is reduced, and the hardware maintenance cost is reduced;

2. the line relay protection service realizes the intelligent switching of the double routes 1+1, and solves the problem of single-fiber overload;

3. all the devices can realize remote centralized network management, and the operation and maintenance are efficient;

4. has high popularization value.

Fig. 9 is a schematic diagram of a line protection device according to an embodiment of the present invention, as shown in fig. 9, according to another aspect of the embodiment of the present invention, there is also provided a line protection device, including: an acquisition module 92, a switching module 94 and a transmission module 96, which are described in detail below.

The acquisition module 92 is used for acquiring fault data of the line; a switching module 94 connected to the collecting module 92 for transmitting the fault data to the switching device; and a sending module 96, connected to the switching module 94, for sending the fault data to the monitoring end by switching the transmission systems of the switching device, where the number of the transmission systems is multiple, and the multiple transmission systems are all in communication connection with the switching device.

Through the device, the fault data of the line is collected by adopting the collection module 92; the switching module 94 transmits the fault data to the switching device; the sending module 96 switches the equipment switching transmission system to send the fault data to the monitoring end, wherein the transmission systems are multiple, the multiple transmission systems are all in communication connection with the switching equipment, the mode of maintaining the line according to the fault data is monitored, the multiple transmission systems are parallel, the normal transmission system is switched to transmit the fault report when the transmission system fails, and the purpose of ensuring effective transmission of the line fault report is achieved, so that the technical effects of improving the reliability and the transmission efficiency of fault information transmission of the line fault are achieved, and further, the technical problems that a line protection device in the related technology is poor in reliability and fault information cannot be effectively transmitted when the line fails are solved.

According to another aspect of the embodiments of the present invention, there is provided a processor, the processor is configured to run a program, wherein the line protection method of any one of the above is performed when the program runs.

According to another aspect of the embodiments of the present invention, there is provided a computer storage medium, the computer storage medium includes a stored program, and the apparatus where the computer storage medium is located is controlled to execute the line protection method of any one of the above methods when the program runs.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A line protection system, comprising: line protection equipment, switching equipment, transmission systems, line switches,

the line protection equipment is connected with the monitored line;

the switching equipment is directly connected with the line protection equipment through optical fibers, and the transmission system which can be normally used is switched under the condition that the current transmission system has a fault;

the transmission systems are multiple and are connected with the switching equipment and the line switch;

the line switch is installed on the monitored line, and disconnects the monitored line according to the received fault report.

2. The line protection system of claim 1, wherein the line protection device is in a different equipment room than the switching device, the line protection device being in direct communication with the switching device via an optical fiber.

3. The line protection system of claim 2, wherein optical fiber interfaces are provided on both the line protection equipment and the switching equipment for installing and connecting optical fibers.

4. The line protection system of claim 3, wherein the fiber optic interface is a 2M fiber optic interface.

5. The line protection system of claim 1, further comprising: the power supply device includes a first power supply device, a second power supply,

the first power supply comprises two independent power supplies and is used for providing dual power supplies for the line protection equipment;

the second power supply comprises two independent power supplies for providing dual power supply for the switching device.

6. The line protection system of claim 1, wherein a gateway device is further connected to the switching device for monitoring data transmitted to the switching device by the transmission system.

7. The line protection system of claim 1, wherein the line switch is a substation switch at both ends of the monitored line transport, and the line protection equipment is connected to the pilot protection interface devices at both ends of the monitored line transport.

8. The line protection system of claim 7, wherein the line protection device is a line relay protection device.

9. The line protection system of claim 1, wherein the line protection device issues an alarm if it collects a fault report for the monitored line.

10. The line protection system of claim 1, wherein the transmission system is an SDH optical transmission system.