Intelligent optical path protection monitoring system for power system

Abstract

The invention discloses an intelligent optical path protection monitoring system for a power system. The intelligent optical path protection monitoring system comprises a master station end arranged in a communication machine room in a power supply area and substation ends arranged in transformer substations. In the master station end, an optical transceiver is connected with an OLP protection unit, an optical pulse tester is connected with the OLP protection unit through a program control multi-path optical switch, and a master control board is connected with the optical pulse tester and the OLP protection unit. In the substation end, the optical transceiver is connected with the OLP protection unit, and the main control board is connected with the OLP protection unit; and the OLP unit of the main station end is connected with the OLP unit of each sub-station end through a main link optical fiber and a standby link optical fiber. According to the invention, optical path automatic switching protection and optical cable on-line visual monitoring analysis can be realized, and a real-time, rapid and accurate fault point positioning means can be realized.

Description

Technical Field

[0001] The present invention relates to the field of optical path protection monitoring systems, and more particularly to an intelligent optical path protection monitoring system for power systems. Background Art

[0002] Optical cables in power systems are characterized by a very wide coverage area distribution, long line transmission distances, and relatively complex terrain environments through which the lines pass. Coupled with the ever-changing external environment, and the fact that optical fibers cannot be bent and are difficult to connect, optical cables are easily damaged. In addition, some of the optical cable lines currently used in power systems have reached the original designed service life, and cable failures will occur more frequently. Once a failure occurs and the interruption lasts for a long time, it will cause huge economic losses and significant social impacts. How to quickly restore services after an optical fiber break, how to quickly locate the fault point, how to give an early warning when the transmission performance of the optical fiber line deteriorates, and how to shorten the fault repair time are directly related to the production safety and stable operation of the power system. Therefore, the automation of on-line monitoring and management and maintenance of optical fiber lines has attracted more and more attention from relevant departments of the power system.

[0003] In the prior art, the traditional maintenance method for optical cables in power systems is carried out manually. The basic process is as follows: when a cable failure occurs, the optical transmission system network management issues a service interruption alarm, the duty personnel notify the cable maintenance unit, the cable maintenance personnel drive to the substation where the cable is located, manually schedule and temporarily restore important services, test through equipment such as OTDR to judge the approximate location of the fault, rush to the site to find the actual fault point, and carry out emergency repairs on the fault point. The problem with this method is that after a fault occurs in the in-use optical fiber of the optical path, there is no means of real-time, fast, and accurate fault point location. The fault point location method has poor timeliness and low accurate determination, delaying the opportunity for emergency repair. Summary of the Invention

[0004] The present invention provides an intelligent optical path protection monitoring system for power systems to solve the problems existing in the manual maintenance of power system cables in the prior art, such as the inability to locate the fault point in real time, quickly, and accurately, the poor timeliness and low accurate determination of the fault point location method, and the delay of the emergency repair opportunity.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: An intelligent optical path protection monitoring system for a power system, comprising a master station end disposed in a communication machine room in a power supply area and a slave station end disposed in each substation; the master station end includes a main control board, an OLP protection unit, an optical pulse tester, a programmed multi-channel optical switch, and an optical terminal unit. In the master station end, the optical terminal unit is connected to the Tx and Rx ports of the OLP protection unit, the optical pulse tester is connected to the M1 port of the OLP protection unit through the programmed multi-channel optical switch, the main control board communicates with the on-board interface of the optical pulse tester, and the main control board also communicates with the on-board interface of the OLP protection unit; The slave station end includes a main control board, an OLP protection unit, and an optical terminal unit. The optical terminal unit of the slave station end is connected to the Tx and Rx ports of the OLP protection unit, and the main control board communicates with the on-board interface of the OLP protection unit; Moreover, the OLP units at the master station end and each slave station end are respectively connected through a primary link optical fiber and a standby link optical fiber.

[0006] Furthermore, the master station end further includes a monitoring center, and the main control board of the master station end is communicatively connected to the monitoring center.

[0007] Furthermore, a dual-receiving and single-transmitting mechanism is adopted between the master station end and each slave station end. When there is signal light in both the primary and standby link optical fibers simultaneously, only one of the signal lights is received.

[0008] Furthermore, one of the master station end and the slave station end is provided with a light source board card, and the other is provided with an optical power meter board card. The ports of the light source board card and the optical power meter board card accessed at both ends are marked, and a label is established in the system to achieve the management of spare fiber cores.

[0009] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides an intelligent optical path protection monitoring system for a power system, which can realize automatic optical path switching protection and online visual monitoring and analysis of optical cables, can achieve real-time, fast, and accurate fault point positioning means, and has the advantages of good timeliness and high accurate determination of the fault point positioning method. Moreover, the present invention does not occupy independent fiber core resources, realizes a holographic management system for optical cable resource data, and a one-stop fault emergency repair prompt service. Description of the Drawings

[0010] Figure 1 is a schematic diagram of the system distribution in an embodiment of the present invention.

[0011] Figure 2 is a schematic structural diagram of the master station end and a single slave station end in the system of an embodiment of the present invention.

[0012] Figure 3 is a schematic diagram of the optical path protection mode in the system of an embodiment of the present invention.

[0013] Figure 4 This is the schematic diagram of the spare fiber core management in the system of the embodiment of the present invention. Specific implementation manners

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] As Figure 1 、 Figure 2 shown, this embodiment discloses an intelligent optical path protection monitoring system for a power system, which is used for an optical fiber communication network composed of a communication machine room in a power supply area and each substation. This embodiment includes a master station end disposed in the communication machine room in the power supply area, and a slave station end disposed in each substation.

[0016] The master station end includes a front-end machine and a monitoring center. The front-end machine of the master station end is integrated with a power supply module, a communication module, a main control board, an OLP protection unit, an optical pulse tester OTDR, a programmable multi-channel optical switch OSW, and an optical terminal unit. The monitoring center of the master station end is integrated with a switch, a data server, and an online monitoring system gateway.

[0017] In the master station end, the main control board is connected to the switch of the monitoring center through the communication module, so that the main control board is respectively communicatively connected to the data server and the online monitoring system gateway through the switch. The output port of the optical terminal unit is connected to the Tx port of the OLP protection unit, and the input port of the optical terminal unit is connected to the Rx port of the OLP protection unit. The optical pulse tester OTDR is connected to the input side port of the programmable multi-channel optical switch OSW, and the output side port of the programmable multi-channel optical switch OSW is connected to the M1 port of the OLP protection unit. The main control board is electrically connected to the... port of the optical pulse tester, and the main control board also communicates with the on-board interface of the OLP protection unit. The power supply module supplies power to each electrical device.

[0018] The slave station end includes a power supply module, a communication module, a main control board, an OLP protection unit, and an optical terminal unit. In the slave station end, the main control board communicates with the on-board interface of the OLP protection unit through the communication module. The output port of the optical terminal unit is connected to the Tx port of the OLP protection unit, and the input port of the optical terminal unit is connected to the Rx port of the OLP protection unit. The power supply module supplies power to each electrical device.

[0019] The OLP units at the master station end are respectively connected to the OLP units at each slave station end through the primary link optical fiber and the standby link optical fiber. Specifically, the connection of the primary and standby link optical fibers between the OLP unit at the master station end and the OLP unit at each slave station end is achieved through an optical fiber distribution frame. In the primary link optical fiber, one end of the primary output optical fiber is connected to the T1 port of the OLP unit at the master station end, and the other end is connected to the R1 port of the OLP unit at the slave station end. One end of the primary input optical fiber is connected to the R1 port of the OLP unit at the master station end, and the other end is connected to the T1 port of the OLP unit at the slave station end. In the standby link optical fiber, one end of the standby output optical fiber is connected to the T2 port of the OLP unit at the master station end, and the other end is connected to the R2 port of the OLP unit at the slave station end. One end of the standby input optical fiber is connected to the R2 port of the OLP unit at the master station end, and the other end is connected to the T2 port of the OLP unit at the slave station end.

[0020] In this embodiment, the monitoring center at the master station end mainly functions to analyze data, process and store all encrypted computer messages. The master station end consists of a monitoring center and a front-end computer. Among them, the monitoring center includes a switch real-time online monitoring system network management and a database server. The front-end computer unit consists of an optical pulse tester OTDR, a programmable multi-channel optical switch OSW-, an optical terminal and a communication module, and a power supply module. The slave station ends are distributed in each substation as monitored sites, and each includes a communication module, a power supply module, a main control board, and an OLP protection unit. The master station end and each slave station end achieve the bridging of the primary and standby link optical fibers through an optical fiber distribution frame.

[0021] In this embodiment, a dual-receiving and single-transmitting mechanism is adopted between the master station end and each slave station end. When there is signal light in both the primary and standby link optical fibers at the same time, only one of the signal lights is received.

[0022] As Figure 3 shown, this embodiment adopts an online dynamic monitoring mode. The OLP protection unit at the master station end captures the optical power values from the primary and standby link optical fibers, compares and screens the captured optical power values with the locally preset optical power threshold values to achieve real-time dynamic monitoring of the optical power. Once it senses that the real-time optical power value exceeds the system preset threshold (-10~-28 dB), an alarm reminder will be triggered, the relevant elements of the message will be automatically recorded, and the switching of the primary and standby link optical fibers will be immediately triggered. At the same time, the OLP at the master station end sends a request to the main control board to call the OTDR for line monitoring. Then, the OTDR and the OSW cooperate to select the faulty optical path to start detecting the optical fiber to be measured. During the detection, the Rayleigh backscattering method and the Fresnel reflection principle are combined to test the optical fiber, so as to capture data such as the attenuation degree, loss value, average value, and attenuation distribution of the optical flux of the faulty optical fiber. Finally, the monitoring center at the master station end performs wave analysis processing on the OTDR backscattering result and outputs the backscattering curve, records the distance of the fault point, combines the GIS data in the system, calculates the accurate position of the fault point, and informs the operation and maintenance personnel through the system.

[0023] In this embodiment, when the main path is communicating normally, the OTDR module at the master station end detects the backup fiber. If there is a fault in the backup fiber, an early warning is given. When a fault occurs in the main fiber, the OLP protection unit at the master station end switches, and the service optical path switches to the backup optical path. Then, the OTDR, OSW, and the main path are connected. The OTDR detects the fault location of the main fiber and gives an alarm. When the fault is repaired, a switching instruction is sent through the software platform, and the corresponding OLP protection units at the master station end and the slave station end switch to the main line simultaneously. In addition, as Figure 4 shown, in this embodiment, one of the master station and the slave station integrates a light source board, and the other integrates an optical power meter board. By connecting the light source board and the optical power meter board to the head and tail of the spare fiber core between the master station and the slave station, the situation of the spare fiber core is uploaded to the platform to form the management and monitoring of the spare fiber core resources.

[0024] This embodiment can achieve a fault perception distance greater than 120 kilometers. After a fault occurs, the service can be restored within 11 ms. The OTDR and OSW quickly select the faulty optical path to quickly locate the fault distance. Combining with the GIS data of the optical cable online monitoring system, the map location of the fault point is calculated, enabling the maintenance personnel to quickly find the fault point and repair the fault, improving the repair efficiency. Compared with the traditional scheme, the intermediate personnel process in the fault handling process is greatly reduced, the service can be restored faster, and the loss can be reduced.

[0025] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. As long as such a combination does not violate the idea of the present invention, it should also be regarded as the content disclosed in the present disclosure. To avoid unnecessary repetition, the present invention does not further explain various possible combination methods.

[0026] The present invention is not limited to the specific details in the above embodiments. Without departing from the technical concept of the present invention and the premise of not departing from the design idea of the present invention, various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. An intelligent optical path protection monitoring system for a power system, characterized in that: It includes a master station end located in a communication room in a power supply area, and a substation end located in each substation; the master station end includes a main control board, an OLP protection unit, an optical pulse tester, a programmable multi-channel optical switch, and an optical terminal. The optical terminal in the master station end is connected to the Tx and Rx ports of the OLP protection unit, the optical pulse tester is connected to the M1 port of the OLP protection unit through the programmable multi-channel optical switch, the main control board communicates with the onboard interface of the optical pulse tester, and the main control board also communicates with the onboard interface of the OLP protection unit; The substation end includes a main control board, an OLP protection unit, and an optical terminal. The optical terminal at the substation end is connected to the Tx and Rx ports of the OLP protection unit, and the main control board communicates with the onboard interface of the OLP protection unit. In addition, the OLP unit at the master station is connected to the OLP unit at each substation through a main link optical fiber and a standby link optical fiber respectively.

2. The intelligent optical path protection monitoring system for power system according to claim 1, characterized in that: The master station also includes a monitoring center, and the main control board of the master station is communicatively connected with the monitoring center.

3. The intelligent optical path protection monitoring system for power system according to claim 1, characterized in that: A dual-receive and selective transmission mechanism is adopted between the main station and each substation. When signal light exists in the main and backup link optical fibers at the same time, only one of the signal lights is received.

4. The intelligent optical path protection monitoring system for power system according to claim 1, characterized in that: One of the main station end and the substation end is provided with a light source board and the other is provided with an optical power meter board. The light source board and the optical power meter board connected to both ends are marked by their port numbers, and labels are established in the system to achieve management of spare fiber cores.

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