Optical Cable Loop State Detection and Fault Self-Recovery Device for the Secondary System of Smart Substations

Abstract

The present invention relates to a device for detecting the state of an optical cable loop in the secondary system of an intelligent substation and for self-recovering from faults. The device includes a first intelligent optical distribution unit, a second intelligent optical distribution unit, and a prefabricated optical cable. The first intelligent optical distribution unit includes a first optical signal transmitting module, a first optical signal receiving module, and a first control module. The second intelligent optical distribution unit includes a second optical signal transmitting module, a second optical signal receiving module, and a second control module. The first optical signal transmitting module is correspondingly connected to the second optical signal receiving module through the prefabricated optical cable. The second optical signal transmitting module is correspondingly connected to the first optical signal receiving module through the prefabricated optical cable. The present invention can achieve the detection of the state of the optical cable loop in the secondary system of the intelligent substation, automatically jump the optical fiber cores through an optical switch according to instructions or preset parameters to achieve self-recovery from faults, can quickly determine the responsibility division of faults in the optical cable network loop of the secondary system, and can be applied to the operation and maintenance of the optical cable network in the secondary system of the intelligent substation.

Description

Technical Field

[0001] The present invention relates to a device for detecting the state of an optical cable loop in a secondary system of an intelligent substation and automatically recovering from faults, and relates to the technical fields of optical fiber signal detection and automatic fiber jumping. Background Art

[0002] With the popularization and application of intelligent substations, prefabricated optical cable technology and non-fusion splicing optical distribution technology have been deeply applied. Currently, the conventional application mode is that the non-fusion splicing optical distribution of the intelligent control cabinet is connected to the non-fusion splicing optical distribution of the centralized transfer cabinet through prefabricated optical cables, and each non-fusion splicing optical distribution is connected to the corresponding secondary equipment through fiber jumping.

[0003] During the construction and commissioning stage of the substation, since all secondary equipment is in the commissioning state, once a fault occurs in the optical cable network loop of the secondary system, it is impossible to quickly determine whether it is a problem with the optical cable loop or the secondary equipment itself. Currently, secondary equipment can only perform basic signal detection on the optical cable network related to itself, and cannot form a unified standard detection for the entire secondary system optical cable network.

[0004] Due to factors such as disaster weather, external force damage, and optical cable aging, once a fault occurs in the operating optical cable network, work such as optical link switching, channel parameter testing, and data collection needs to be completed manually on-site. Problems such as various losses caused by delays in discovering and locating optical fiber faults and deterioration, as well as the increase in maintenance costs, are becoming increasingly serious. Summary of the Invention

[0005] In view of the above problems, one of the objectives of the present invention is to provide a device for detecting the state of an optical cable loop in a secondary system of an intelligent substation and automatically recovering from faults, which can realize the detection of the state of the optical cable loop in the secondary system of the intelligent substation. Another objective of the present invention is to provide a method for detecting the state of an optical cable loop in a secondary system of an intelligent substation and automatically recovering from faults.

[0006] In order to achieve the above invention objectives, the technical solutions adopted by the present invention are as follows:

[0007] In the first aspect, the present invention provides a device for detecting the state of an optical cable loop in a secondary system of an intelligent substation and automatically recovering from faults, which device includes a first intelligent optical distribution, a second intelligent optical distribution, and a prefabricated optical cable;

[0008] The first intelligent optical distribution includes a first optical signal transmitting module, a first optical signal receiving module, and a first control module; the first control module receives the signals of the first optical signal transmitting module and the first optical signal receiving module in real time, and controls the first optical signal transmitting module and the first optical signal receiving module to perform optical signal detection and switching respectively through preset parameters or instructions;

[0009] The second intelligent optical distribution includes a second optical signal transmitting module, a second optical signal receiving module, and a second control module. The second control module receives the signals of the second optical signal transmitting module and the second optical signal receiving module in real time, and controls the second optical signal transmitting module and the second optical signal receiving module to perform optical signal detection and switching respectively through preset parameters or instructions; wherein,

[0010] The first optical signal transmitting module is correspondingly connected to the second optical signal receiving module through a prefabricated optical cable;

[0011] The second optical signal transmitting module is correspondingly connected to the first optical signal receiving module through a prefabricated optical cable.

[0012] Further, the first optical signal transmitting module includes n 1*2 optical switches, 1 1*n optical switch, n + 1 optical splitters, and n + 1 photodetectors; the first optical signal receiving module includes n 1*2 optical switches, 1 1*n optical switch, n + 1 optical splitters, and n + 1 photodetectors;

[0013] Among them, the optical signal on the device side can be switched and connected to the optical splitter and the 1*n optical switch through the optical switch. The optical splitter is used to split the received optical signal. Among them, a part of the light is input to the photodetector, and the other part of the light is transmitted to the second optical signal receiving module through the prefabricated optical cable; the optical signal output by the 1*n optical switch is split by the (n + 1)-th optical splitter. A part of the split light is transmitted to the second signal receiving module through the prefabricated optical cable, and the other part of the light is sent to the (n + 1)-th photodetector; the connection mode between the second signal transmitting module and the first optical signal receiving module is the same as the connection mode between the first optical signal transmitting module and the second signal receiving module. Among them, the optical signal passing through the second optical signal transmitting module is sequentially transmitted to the optical splitter and the optical switch of the first optical signal receiving module through the prefabricated optical cable and output to the device side.

[0014] Further, the first intelligent optical distribution further includes a first control module, which receives the signals of the photodetector and the photodetector in real time, and controls the first optical signal transmitting module and the first optical signal receiving module to perform optical signal detection and switching respectively through preset parameters or instructions.

[0015] Further, the second optical signal transmitting module includes n 1*2 optical switches, 1 1*n optical switch, n + 1 optical splitters, and n + 1 photodetectors; the second optical signal receiving module includes n 1*2 optical switches, 1 1*n optical switch, n + 1 optical splitters, and n + 1 photodetectors; wherein,

[0016] The optical signal on the device side can be switched through an optical switch to connect to an optical splitter and a 1*n optical switch. The optical splitter splits the received optical signal. Among them, a part of the light is input into a photodetector, and the other part of the light is transmitted to the first optical signal receiving module through a prefabricated optical cable; the 1*n optical switch is split by the (n + 1)th optical splitter. A part of the split light is transmitted to the first signal receiving module through a prefabricated optical cable, and the other part of the light is sent to the (n + 1)th photodetector; the connection mode of the second optical signal receiving module and the first optical signal transmitting module is the same as the connection mode of the second optical signal transmitting module and the first signal receiving module. The light is sequentially transmitted through a prefabricated optical cable through the first optical signal transmitting module to the optical splitter and optical switch of the second optical signal receiving module and output to the device side.

[0017] Further, the second intelligent optical distribution further includes a second control module, which receives the signals of each photodetector and the photodetector in real time, and respectively controls the second optical signal transmitting module and the second optical signal receiving module to perform optical signal detection and switching through preset parameters or instructions.

[0018] Further, the first intelligent optical distribution and the second intelligent optical distribution are respectively connected to the prefabricated optical cable through corresponding prefabricated optical cable connectors.

[0019] In a second aspect, the present invention also provides a method for detecting the state of the optical cable loop and self-recovering from faults in the secondary system of an intelligent substation, including:

[0020] The optical signal on the device side is input through the interface of the first optical signal transmitting module of the first intelligent optical distribution, and after passing through the optical switch and optical splitter of the first optical signal transmitting module, it is connected to the second optical signal receiving module of the second intelligent optical distribution through a prefabricated optical cable connector, a prefabricated optical cable, and a prefabricated optical cable connector, and is output to the device side after passing through the optical splitter and optical switch (221) of the second optical signal receiving module (22);

[0021] The optical signal on the device side is input through the interface of the second optical signal transmitting module (21) of the second intelligent optical distribution (2). After passing through the optical switch (211) and optical splitter (213) of the second optical signal transmitting module (21), it is connected to the first optical signal receiving module (12) of the first intelligent optical distribution (1) through a prefabricated optical cable connector (24), a prefabricated optical cable (3), and a prefabricated optical cable connector (14), and is output to the device side after passing through the optical splitter (123) and optical switch (121) of the first optical signal receiving module (12).

[0022] Further, the first control module receives the signals of the photodetectors (114) and (124) in real time, and the second control module (23) receives the signals of the photodetectors (214) and (224) in real time. According to the preset parameter values, the optical signals are judged to form four states of each optical signal path, including normal, prefabricated optical cable fault, intelligent optical distribution fault, and no signal state.

[0023] Further, the first control module and the second control module judge and alarm the four states. The judgment conditions for the four states are as follows:

[0024] Normal state: The transmitting end signal is normal and the receiving end signal is normal;

[0025] Prefabricated optical cable fault: The transmitting end signal is normal and the receiving end signal is faulty;

[0026] Intelligent optical distribution fault: The transmitting end signal is faulty and the receiving end signal is normal;

[0027] No signal: The transmitting end signal is faulty and the receiving end signal is faulty.

[0028] Further, when a prefabricated optical cable fault occurs, the first control module (13) controls the corresponding optical switch (111) of the first optical signal transmitting module (11) to switch to the optical switch (112) through preset parameters or instructions, and at the same time controls the optical switch (112) of the first optical signal transmitting module (11) to switch to the corresponding optical switch (111) to complete the optical path switching of the first optical signal transmitting module (11); the second control module (23) controls the corresponding optical switch (221) of the second optical signal receiving module (22) to switch to the optical switch (222) through preset parameters or instructions, and at the same time controls the optical switch (222) to switch to the corresponding optical switch (221) to complete the optical path switching of the second optical signal receiving module (22).

[0029] Due to the above technical solutions adopted by the present invention, it has the following characteristics: The intelligent substation secondary system optical cable loop status detection and fault self-recovery method provided by the present invention correspondingly connects the second optical signal transmitting module of the first intelligent optical distribution to the first optical signal receiving module of the second intelligent optical distribution through a prefabricated optical cable, and correspondingly connects the first optical signal receiving module of the first intelligent optical distribution to the second optical signal transmitting module of the second intelligent optical distribution through a prefabricated optical cable. The first control module receives the signals of the first optical signal transmitting module and the first optical signal receiving module in real time, and controls the first optical signal transmitting module and the first optical signal receiving module to perform optical signal detection and switching respectively through preset parameters or instructions; the second control module receives the signals of the second optical signal transmitting module and the second optical signal receiving module in real time, and controls the second optical signal transmitting module and the second optical signal receiving module to perform optical signal detection and switching respectively through preset parameters or instructions; Therefore, the present invention can realize the detection of the status of the optical cable loop of the intelligent substation secondary system, automatically jump the fiber core through the optical switch according to the instruction or preset parameters to achieve fault self-recovery, can quickly determine the responsibility division of the optical cable network loop fault of the secondary system, and can be applied to the operation and maintenance and overhaul of the optical cable network of the intelligent substation secondary system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0031] Figure 1 It is a schematic structural diagram of the intelligent substation secondary system optical cable loop status detection and fault self-recovery device according to an embodiment of the present invention. In the figure, RX represents signal transmission, and TX represents signal reception;

[0032] Figure 2 It is a schematic diagram of the first intelligent optical distribution of the intelligent substation secondary system optical cable loop status detection and fault self-recovery method according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the second intelligent optical distribution of the intelligent substation secondary system optical cable loop status detection and fault self-recovery method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. Method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is expressly stated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, a first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings of example embodiments.

[0036] For ease of description, spatial relative relation terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatial relative relation terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figures.

[0037] Due to problems such as delays in detecting optical fiber faults, deterioration, and locating positions, various losses and increased maintenance costs occur. The intelligent substation secondary system optical cable loop state detection and fault self-recovery method and device proposed by the present invention. The device includes a first intelligent optical distribution unit, a second intelligent optical distribution unit, and a prefabricated optical cable; the first intelligent optical distribution unit includes a first optical signal receiving module and a first optical signal transmitting module; the second intelligent optical distribution unit includes a second optical signal transmitting module and a second optical signal receiving module; the first optical signal transmitting module is correspondingly connected to the second optical signal receiving module through the prefabricated optical cable; the first optical signal receiving module is correspondingly connected to the second optical signal transmitting module through the prefabricated optical cable. The intelligent substation secondary system optical cable loop state detection and fault self-recovery method provided by the present invention is used to detect the state of the optical cable loop in the secondary system of the intelligent substation, and automatically jump the fiber core through an optical switch according to a remote operation instruction or preset parameters of the station control layer computer to achieve fault self-recovery, and can quickly determine the responsibility division of faults in the optical cable network loop of the secondary system.

[0038] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0039] Embodiment 1: As Figure 1 shown, the intelligent substation secondary system optical cable loop state detection and fault self-recovery device provided in this embodiment includes a first intelligent optical distribution unit 1, a second intelligent optical distribution unit 2, and a prefabricated optical cable 3;

[0040] The first intelligent optical distribution unit 1 includes a first optical signal transmitting module 11 and a first optical signal receiving module 12;

[0041] The second intelligent optical distribution unit 2 includes a second optical signal transmitting module 21 and a second optical signal receiving module 22; wherein,

[0042] The first optical signal transmitting module 11 is correspondingly connected to the second optical signal receiving module 22 through the prefabricated optical cable 3;

[0043] The first optical signal receiving module 12 is correspondingly connected to the second optical signal transmitting module 21 through the prefabricated optical cable 3.

[0044] In a preferred embodiment, as Figure 2 shown, the first optical signal transmitting module 11 includes n 1*2 optical switches 111, one 1*n optical switch 112, n + 1 optical splitters 113, and n + 1 photodetectors 114;

[0045] Among them, the optical signal on the device side can be switchably connected to the optical splitter 113 and the 1×n optical switch 112 through the optical switch 111. The optical splitter 113 is used to split the received optical signal. Among them, a part of the light is input to the photodetector 114, and the other part of the light is transmitted to the second optical signal receiving module 22 through the prefabricated optical cable 3; the optical signal output by the 1×n optical switch 112 is split by the (n + 1)-th optical splitter 114. A part of the split light is transmitted to the second signal receiving module 22 through the prefabricated optical cable 3, and the other part of the light is sent to the (n + 1)-th photodetector 114.

[0046] The first optical signal receiving module 12 includes n 1×2 optical switches 121, (n + 1) optical splitters 121, 1 1×n optical switch 122, (n + 1) optical splitters 123, and (n + 1) photodetectors 124; among them, the connection mode between the first optical signal receiving module 12 and the second signal transmitting module 21 is basically the same as the connection mode between the first optical signal transmitting module 11 and the second signal receiving module 22 above. The optical signals that pass through the first optical signal transmitting module 11 and are sequentially transmitted to the optical splitter 223 and the optical switch 221 of the second optical signal receiving module 22 are output to the device side through the prefabricated optical cable 3.

[0047] In this embodiment, the first intelligent optical distribution unit 1 further includes a first control module 13, which receives the signals of the photodetectors 114 and 124 in real time, and respectively controls the first optical signal transmitting module 11 and the first optical signal receiving module 12 to perform optical signal detection and switching through preset parameters or instructions.

[0048] In this embodiment, the first intelligent optical distribution unit 1 is connected to the prefabricated optical cable 3 through a prefabricated optical cable connector 14.

[0049] In a preferred implementation, as Figure 3 shown, the second optical signal transmitting module 21 includes n 1×2 optical switches 211, 1 1×n optical switch 212, (n + 1) optical splitters 213, and (n + 1) photodetectors 214.

[0050] Among them, the optical signal on the device side can be switchably connected to the optical splitter 213 and the 1×n optical switch 212 through the optical switch 211. The optical splitter 213 splits the received optical signal. Among them, a part of the light is input to the photodetector 214, and the other part of the light is transmitted to the first optical signal receiving module 12 through the prefabricated optical cable 3; the optical signal passing through the 1×n optical switch 212 is split by the (n + 1)-th optical splitter 213. A part of the split light is transmitted to the first signal receiving module 12 through the prefabricated optical cable 3, and the other part of the light is sent to the (n + 1)-th photodetector 214.

[0051] The second optical signal receiving module 22 includes n 1*2 optical switches 221, one 1*n optical switch 222, n+1 optical splitters 223, and n+1 photodetectors 224; the connection mode of the second optical signal receiving module 22 with the first optical signal transmitting module 11 is basically the same as the connection method of the above-mentioned second optical signal transmitting module 21 with the first signal receiving module 12. The optical signal transmitted through the first optical signal transmitting module 11 is sequentially transmitted to the optical splitter 223 and the optical switch 221 of the second optical signal receiving module 22 through the prefabricated optical cable 3 and then output to the device side.

[0052] In this embodiment, the second intelligent optical distribution unit 1 further includes a second control module 23, which receives the signals of the photodetectors 224 and 214 in real time, and respectively controls the second optical signal transmitting module 22 and the second optical signal receiving module 21 to perform optical signal detection and switching through preset parameters or instructions.

[0053] In this embodiment, the second intelligent optical distribution unit 2 is connected to the prefabricated optical cable 3 through a prefabricated optical cable connector 24.

[0054] Embodiment 2: This embodiment also provides a method for detecting the optical cable loop state and self-recovery of faults in the secondary system of a smart substation, including:

[0055] S1. The optical signal on the device side is input through the interface of the first optical signal transmitting module 11 of the first intelligent optical distribution unit 1, and after passing through the optical switch 111 and the optical splitter 113, it is connected to the first optical signal receiving module 22 of the second intelligent optical distribution unit 2 through the prefabricated optical cable connector 14, the prefabricated optical cable 3, and the prefabricated optical cable connector 24, and then output to the device side after passing through the optical splitter 223 and the optical switch 221;

[0056] S2. The optical signal on the device side is input through the interface of the second optical signal transmitting module 21 of the second intelligent optical distribution unit 2, and after passing through the optical switch 211 and the optical splitter 213, it is connected to the first optical signal receiving module 12 of the first intelligent optical distribution unit 1 through the prefabricated optical cable connector 24, the prefabricated optical cable 3, and the prefabricated optical cable connector 14, and then output to the device side after passing through the optical splitter 123 and the optical switch 121.

[0057] Further, the optical splitters 113, 123, 213, and 223 split the received signals according to a certain ratio of 5:95, where 95% is used as the working optical signal and 5% is used as the measurement optical signal, and are transmitted to the corresponding photodetectors.

[0058] Furthermore, the photodetectors 114, 124, 214, and 224 detect the received optical signals in real time and transmit them to the first control module 13 and the second control module 23. The first control module 13 receives the signals of the photodetectors 114 and 124 in real time, and the second control module 23 receives the signals of the photodetectors 214 and 224 in real time. According to the preset parameter values, the optical signals are judged to form four states of each optical signal path, as shown in Table 1, namely normal, prefabricated optical cable fault, intelligent optical distribution fault, and no signal state.

[0059] Table 1

[0060] Serial number Transmitter signal Receiver signal Status Remarks Status 1 Normal Normal Normal Status 2 Normal Fault Preformed optical cable fault Status 3 Fault Normal Intelligent optical distribution fault Status 4 Fault Fault No signal

[0061] Furthermore, the first control module 13 and the second control module 23 judge and alarm the four states shown in Table 1. For example, for the state 2 prefabricated optical cable fault, the first control module 13 controls the corresponding optical switch 111 to switch to the optical switch 112 through preset parameters or instructions, and at the same time controls the optical switch 112 to switch to the corresponding optical switch 111 to complete the optical path switching of the first optical signal transmitting module 11; the second control module 23 controls the corresponding optical switch 221 to switch to the optical switch 222 through preset parameters or instructions, and at the same time controls the optical switch 222 to switch to the corresponding optical switch 221 to complete the optical path switching of the second optical signal receiving module 22.

[0062] Furthermore, through the optical distribution, detection, analysis, and judgment of optical signals, the detection of the optical cable loop state of the secondary system of the intelligent substation is realized. The substation control layer computer analyzes and judges the received state detection information, determines the fault responsibility, and generates four state instructions, namely immediate switching, maintenance switching, only alarm, and ignore, in combination with the secondary equipment information and the severity of the fault. The control module automatically cross-connects the fiber cores through the optical switch according to the remote operation instructions or preset parameters of the substation control layer computer to achieve fault self-recovery, and quickly determines the responsibility division of the optical cable network loop fault in the secondary system.

[0063] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In the description of this specification, the description with reference to terms such as "one embodiment" and "some implementations" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent substation secondary system optical cable loop state detection and fault self-recovery device, characterized in that, The device includes a first intelligent optical distribution unit (1), a second intelligent optical distribution unit (2), and a prefabricated optical cable (3); The first intelligent optical distribution unit (1) includes a first optical signal transmitting module (11), a first optical signal receiving module (12), and a first control module (13); the first control module (13) receives the signals of the first optical signal transmitting module (11) and the first optical signal receiving module (12) in real time, and controls the first optical signal transmitting module (11) and the first optical signal receiving module (12) to perform optical signal detection and switching respectively through preset parameters or instructions; The second intelligent optical distribution unit (2) includes a second optical signal transmitting module (21), a second optical signal receiving module (22), and a second control module (23), the second control module (23) receives the signals of the second optical signal transmitting module (21) and the second optical signal receiving module (22) in real time, and controls the second optical signal transmitting module (21) and the second optical signal receiving module (22) to perform optical signal detection and switching respectively through preset parameters or instructions; wherein, The first optical signal transmitting module (11) is correspondingly connected to the second optical signal receiving module (22) through the prefabricated optical cable (3); The second optical signal transmitting module (21) is correspondingly connected to the first optical signal receiving module (12) through the prefabricated optical cable (3); The first optical signal transmitting module (11) includes n 1*2 optical switches (111), 1 1*n optical switch (112), n + 1 optical splitters, and n + 1 photodetectors (114); the first optical signal receiving module (12) includes n 1*2 optical switches (121), 1 1*n optical switch (122), n + 1 optical splitters, and n + 1 photodetectors (124); Among them, the optical signal on the device side can be switched and connected to n optical splitters (113) and the 1*n optical switch (112) through the optical switch (111); The second optical signal transmitting module (21) includes n 1*2 optical switches (211), 1 1*n optical switch (212), n + 1 optical splitters, and n + 1 photodetectors (214); the second optical signal receiving module (22) includes n 1*2 optical switches (221), 1 1*n optical switch (222), n + 1 optical splitters, and n + 1 photodetectors (224); wherein, The optical signal on the device side can be switched and connected to n optical splitters (213) and the 1*n optical switch (212) through the optical switch (211).

2. The optical cable loop state detection and fault self - recovery device for the secondary system of an intelligent substation according to claim 1, wherein, The first intelligent optical distribution unit (1) further includes a first control module (13), which receives the signals of the photodetectors (114) and the photodetectors (124) in real time, and controls the first optical signal transmitting module (11) and the first optical signal receiving module (12) to perform optical signal detection and switching respectively through preset parameters or instructions.

3. The optical cable loop state detection and fault self - recovery device for the secondary system of an intelligent substation according to claim 1, wherein The second intelligent optical distribution unit (2) further includes a second control module (23), which receives the signals of each photodetector (224) and photodetector (214) in real time, and controls the second optical signal transmitting module (21) and the second optical signal receiving module (22) to perform optical signal detection and switching respectively through preset parameters or instructions.

4. The optical cable loop state detection and fault self - recovery device for the secondary system of an intelligent substation according to claim 3, characterized in that, The first intelligent optical distribution unit (1) and the second intelligent optical distribution unit (2) are respectively connected to the prefabricated optical cable (3) through corresponding prefabricated optical cable connectors (14, 24).

5. The method of the optical cable loop state detection and fault self - recovery device for the secondary system of an intelligent substation according to any one of claims 1 to 4, characterized in that, It includes: The optical signal on the device side is input through the interface of the first optical signal transmitting module (11) of the first intelligent optical distribution unit (1), and after passing through the optical switch (111) and optical splitter (113) of the first optical signal transmitting module (11), it is connected to the second optical signal receiving module (22) of the second intelligent optical distribution unit (2) through the prefabricated optical cable connector (14), prefabricated optical cable (3) and prefabricated optical cable connector (24), and is output to the device side after passing through the optical splitter (223) and optical switch (221) of the second optical signal receiving module (22); The optical signal on the device side is input through the interface of the second optical signal transmitting module (21) of the second intelligent optical distribution unit (2), and after passing through the optical switch (211) and optical splitter (213) of the second optical signal transmitting module (21), it is connected to the first optical signal receiving module (12) of the first intelligent optical distribution unit (1) through the prefabricated optical cable connector (24), prefabricated optical cable (3) and prefabricated optical cable connector (14), and is output to the device side after passing through the optical splitter (123) and optical switch (121) of the first optical signal receiving module (12).

6. The method according to claim 5, wherein The first control module receives the signals of the photodetectors (114) and (124) in real time, and the second control module (23) receives the signals of the photodetectors (214) and (224) in real time. According to the preset parameter values, the optical signal is judged to form four states of each optical signal path, including normal, prefabricated optical cable failure, intelligent optical distribution failure, and no signal state.

7. The method according to claim 6, characterized in that, The first control module and the second control module judge and alarm the four states. The judgment conditions for the four states are: Normal state: The transmitting end signal is normal and the receiving end signal is normal; Prefabricated optical cable failure: The transmitting end signal is normal and the receiving end signal fails; Intelligent optical distribution failure: The transmitting end signal fails and the receiving end signal is normal; No signal: The transmitting end signal fails and the receiving end signal fails.

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