Reliability calculation method and system for multi-redundancy all-fiber current transformer

Abstract

The invention provides a reliability calculation method and system for a multi-redundancy all-fiber current transformer. The method comprises the following steps: constructing a first reliability model of each element in the all-fiber current transformer according to a topological relation of a first optical path, a second optical path and a first circuit; respectively constructing fault rate models of the first light path, the second light path and the first circuit according to the reliability; constructing a second reliability model of the multi-redundancy all-fiber current transformer according to a design result; the reliability and unreliability of the first redundant light path, the second redundant light path and the first redundant circuit are calculated according to the fault rate models of the first light path, the second light path and the first circuit; and the reliability and the unreliability of the second reliability model are calculated according to the reliability and the unreliability of the first redundant light path, the second redundant light path and the first redundant circuit. According to the invention, the reliability of the mutual inductor system can be accurately quantified and effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reliability calculation of transformers, in particular to a reliability calculation method and system of a multi-redundant all-fiber current transformer. BACKGROUND

[0002] With the continuous development and construction of ultra-high voltage direct current transmission technology, all-fiber current transformers have been widely used in current monitoring of direct current transmission systems. The adverse state of all-fiber current transformers may lead to adverse consequences such as protection misoperation and protection refusal, and even cause huge social and economic losses. How to calculate the reliability of all-fiber current transformers has become a problem to be solved.

[0003] However, there is little research on the reliability calculation method of all-fiber current transformers at present, and all-fiber current transformers often adopt multi-redundant design scheme. Therefore, it is an urgent need to provide a reliability calculation method of a multi-redundant all-fiber current transformer. SUMMARY

[0004] The present application aims to provide a reliability calculation method and system of a multi-redundant all-fiber current transformer, which aims to solve the problem of low effectiveness of knowledge tracking caused by ignoring the important influence of negative learning transfer on knowledge tracking in traditional technology.

[0005] In a first aspect, the present application provides a reliability calculation method of a multi-redundant all-fiber current transformer, which comprises:

[0006] Obtaining the optical path composition and the first circuit contained in the all-fiber current transformer, the optical path composition comprising a first optical path and a second optical path, and constructing a first reliability model of each element in the all-fiber current transformer according to the topological relationship of the first optical path, the second optical path and the first circuit, the first reliability model comprising the reliability, the unreliability and the failure rate of each element;

[0007] According to the reliability of each element contained in the first optical path, the second optical path and the first circuit, the reliability of each element is calculated respectively, and the failure rate model of the first optical path, the second optical path and the first circuit is constructed according to the reliability respectively;

[0008] The first optical path, the second optical path and the first circuit are redundantly designed, and a second reliability model of a multi-redundant all-fiber current transformer is constructed according to the design results, the second reliability model comprising a first redundant optical path, a second redundant optical path and a first redundant circuit;

[0009] The reliability and unreliability of the first redundant optical path, the second redundant optical path and the first redundant circuit are calculated according to the reliability and unreliability of the first redundant optical path, the second redundant optical path and the first redundant circuit.

[0010] Further, the step of calculating the reliability of the first optical path, the second optical path and the first circuit according to the reliability of each element contained in the first optical path, the second optical path and the first circuit respectively, and constructing the failure rate model of the first optical path, the second optical path and the first circuit according to the reliability respectively comprises:

[0011] The reliability of the first optical path is calculated according to the following formula:

[0012] K g1 (t) = K gy (t) × K oh (t) × K qp (t) × K gd (t);

[0013] The failure rate model of the first optical path is calculated according to the following formula:

[0014] G g1 = G gy + G oh + G qp + G gd ;

[0015] K g1 (t) = e -Gg1 ;

[0016] B g1 (t) = 1 - K g1 (t);

[0017] Wherein, K g1 (t), G g1 , B g1 (t) are the reliability, failure rate and unreliability of the first optical path, K gy (t), G gy are the reliability and failure rate of the light source, K oh (t), G oh are the reliability and failure rate of the coupler, K qp (t), G qp are the reliability and failure rate of the polarizer, K gd (t), G gd are the reliability and failure rate of the photodetector.

[0018] Furthermore, the step of calculating the reliability of each component included in the first optical path, the second optical path, and the first circuit based on their respective reliability, and constructing failure rate models for the first optical path, the second optical path, and the first circuit based on the reliability, further includes:

[0019] The reliability of the second optical path is calculated using the following formula:

[0020] K g2 (t)=K fs (t)×K gx (t)×K 41 (t)×K bp (t);

[0021] The failure rate model of the second optical path is constructed based on the following formula:

[0022] G g2 =G fs +G gx +G 41 +G bp ;

[0023] K g2 (t)=e -Gg2 ;

[0024] B g2 (t)=1-K g2 (t);

[0025] Among them, K g2 (t), G g2 B g2 (t) represents the reliability, failure rate, and unreliability of the second optical path, and K fs (t), G fs For the reliability and failure rate of the reflector, K gx (t), G gx K represents the reliability and failure rate of the fiber optic sensing loop. 41 (t), G 41 K represents the reliability and failure rate of a quarter-wave plate. bp (t), G bp To ensure the reliability and failure rate of polarization-maintaining optical fibers.

[0026] Furthermore, the step of calculating the reliability of each component included in the first optical path, the second optical path, and the first circuit based on their respective reliability, and constructing failure rate models for the first optical path, the second optical path, and the first circuit based on the reliability, further includes:

[0027] The reliability of the first circuit is calculated using the following formula:

[0028] K d (t)=Kqd (t)×K qf (t)×K ad (t)×K xh (t)×K da (t);

[0029] Construct the failure rate model for the first circuit based on the following formula:

[0030] G d =G qd +G qf +G ad +G xh +G da ;

[0031] K d (t)=e -Gd ;

[0032] B d (t)=1-K d (t);

[0033] Among them, K d (t), G d B d (t) represents the reliability, failure rate, and unreliability of the first circuit, K qd (t), G qd For the reliability and failure rate of the drive circuit, K qf (t), G qf For the reliability and failure rate of the preamplifier, K ad (t), G ad K represents the reliability and failure rate of the A / D module. xh (t), G xh K represents the reliability and failure rate of the signal processing unit. da (t), G da For the reliability and failure rate of the D / A module.

[0034] Furthermore, the step of calculating the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second optical path, and the first circuit includes:

[0035] The unreliability of the first redundant optical path is expressed as:

[0036] B N1 (t)=(1-K g1 (t)) N =(1-e -Gg1 ) N ;

[0037] The reliability of the first redundant optical path is:

[0038] K N1 (t)=1-B N1 (t)=1-(1-e -Gg1 ) N ;

[0039] The unreliability of the second redundant optical path is expressed as:

[0040] B N2 (t)=(1-e -Gg2 ) N ;

[0041] The reliability of the second redundant optical path is:

[0042] K N2 (t)=1-(1-e -Gg2 ) N ;

[0043] The unreliability of the first redundant circuit is expressed as:

[0044] B M (t)=(1-e -Gd ) M ;

[0045] The reliability of the first redundant circuit is:

[0046] K M (t)=1-(1-e -Gd ) M ;

[0047] Among them, B N1 (t), K N1 (t) represents the unreliability and reliability of the first redundant optical path, B N2 (t), K N2 (t) represents the unreliability and reliability of the second redundant optical path, respectively, and B M (t), K M (t) represents the unreliability and reliability of the first redundant circuit, respectively; N represents the number of first optical paths included in the first redundant optical path; and M represents the number of second optical paths included in the second redundant optical path.

[0048] Furthermore, the step of calculating the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit includes:

[0049] The reliability of the second reliability model is calculated using the following formula:

[0050] K(t)=K N1 (t)×K xw (t)×K N2(t)×K M (t);

[0051] The unreliability of the second reliability model is calculated using the following formula:

[0052] B(t) = 1 - K(t);

[0053] Where K(t) and B(t) are the reliability and unreliability of the second reliability model, respectively, and K xw (t) represents the reliability of the phase modulator.

[0054] Secondly, the present invention provides a reliability calculation system for a multi-redundant all-fiber current transformer, the system comprising:

[0055] The first model construction module is used to obtain the optical path composition and the first circuit contained in the all-fiber current transformer. The optical path composition includes the first optical path and the second optical path. Based on the topological relationship of the first optical path, the second optical path and the first circuit, the first reliability model of each component in the all-fiber current transformer is constructed. The first reliability model includes the reliability, unreliability and failure rate of each component.

[0056] The failure rate model construction module is used to calculate the reliability of each component contained in the first optical path, the second optical path, and the first circuit, and to construct the failure rate models of the first optical path, the second optical path, and the first circuit based on the reliability.

[0057] The second model construction module is used to perform redundant design on the first optical path, the second optical path and the first circuit, and to construct a second reliability model of the multi-redundant all-fiber current transformer based on the design results. The second reliability model includes the first redundant optical path, the second redundant optical path and the first redundant circuit.

[0058] The parameter calculation module is used to calculate the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second redundant optical path, and the first circuit, and to calculate the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit.

[0059] Thirdly, the present invention provides a storage medium that stores one or more programs, which, when executed by a processor, implement the above-described reliability calculation method for multi-redundant all-fiber current transformers.

[0060] Fourthly, the present invention provides an electronic device, the electronic device comprising a memory and a processor, wherein:

[0061] The memory is used to store computer programs;

[0062] When the processor executes the computer program stored in the memory, it implements the above-mentioned reliability calculation method for the multi-redundant all-fiber current transformer.

[0063] Compared with the prior art, the present invention has the following advantages:

[0064] The reliability calculation method and system for multi-redundant all-fiber current transformers provided by this invention achieves accurate quantification and effective improvement of system reliability by constructing a complete reliability assessment system and introducing an intelligent redundancy design mechanism. The method first establishes a full-element reliability model including optical and circuit components, and calculates the failure rate of each subsystem using a series formula; then, it employs parallel redundancy design to significantly reduce system unreliability. For example, triple redundancy can reduce the optical path unreliability from 10... -3 Reduced to 10 -9 Ultimately, through comprehensive system-level reliability analysis, the overall availability is ensured to reach over 99.999%. Compared to traditional methods, this invention features high computational accuracy, precise fault location, and significant optimization effects, providing a scientific basis and technical support for the reliability design and maintenance of key measurement equipment in power systems. Attached Figure Description

[0065] Figure 1 This is a flowchart of a reliability calculation method for a multi-redundant all-fiber current transformer proposed in an embodiment of the present invention;

[0066] Figure 2 This is a schematic diagram of the first reliability model of an all-fiber current transformer.

[0067] Figure 3 This is a schematic diagram of the reliability model of the first optical path;

[0068] Figure 4 This is a schematic diagram of the reliability model for the second optical path;

[0069] Figure 5 This is a schematic diagram of the reliability model of the optical path system;

[0070] Figure 6 This is a schematic diagram of the reliability model of the first circuit;

[0071] Figure 7 A schematic diagram of the second reliability model for a multi-redundant all-fiber current transformer;

[0072] Figure 8 This is a schematic diagram of the structure of a reliability calculation system for a multi-redundant all-fiber current transformer proposed in an embodiment of the present invention.

[0073] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects.

[0075] like Figure 1 As shown, an embodiment of the present invention provides a reliability calculation method for a multi-redundant all-fiber current transformer, the method comprising steps S101 to S104, wherein:

[0076] Step S101: Obtain the optical path composition and first circuit of the all-fiber current transformer. The optical path composition includes a first optical path and a second optical path. Based on the topological relationship of the first optical path, the second optical path, and the first circuit, construct a first reliability model for each component in the all-fiber current transformer. The first reliability model includes the reliability, unreliability, and failure rate of each component.

[0077] It should be noted that the all-fiber optic current transformer (FOCT) is a novel current sensing device based on the Faraday magneto-optical effect. It utilizes optical, microelectronic, and microcomputer technologies to achieve precise current measurement. Compared to traditional electromagnetic current transformers, FOCT offers significant advantages, including but not limited to coreless design, simple insulation structure, compact size, light weight, and excellent electromagnetic interference resistance.

[0078] The core of an all-fiber current transformer (FOCT) lies in its use of the Faraday effect to detect current. When linearly polarized light passes through a medium along the direction of an applied magnetic field or magnetization, the plane of polarization rotates; this phenomenon is known as the Faraday effect. In an FOCT, continuous light emitted from the light source is converted into linearly polarized light after passing through a coupler and reaching the polarizer. This linearly polarized light then enters the phase modulator at a 45° angle, splitting into two orthogonal linearly polarized beams that propagate along the two axes of the fiber. When these two beams are subjected to a magnetic field generated by a current, a phase difference proportional to the carrier current is generated between them. Where N is the number of turns in the optical fiber, V is the Wilder constant, and I is the current being measured. This phase difference doubles on the return path and eventually forms a detectable signal change through interference. This change is captured by a photodetector and converted into an electrical signal, from which the original current value is calculated.

[0079] The first reliability model of the all-fiber current transformer is as follows: Figure 2 As shown, it typically includes an optical path structure and a circuit structure. The optical path consists of a light source, photodetector, coupler, polarizer, phase modulator, polarization-maintaining fiber, quarter-wave plate, mirror, and fiber optic sensing ring. The circuit consists of a driver circuit, preamplifier, A / D module, signal processing unit, and D / A module.

[0080] This embodiment uses mathematical statistics to establish a reliability model. The reliability model for a single component includes a reliability model, an unreliability model, and a failure rate model. Since the reliability, unreliability, and failure rate of a component can usually be obtained from the manufacturer's manual or from historical operating data, they will not be elaborated here.

[0081] Symbol explanation:

[0082] Light source, corresponding reliability parameter: reliability is K gy (t), unreliability is B gy (t), failure rate G gy .

[0083] The reliability parameter for the photodetector is: reliability is K. gd (t), unreliability is B gd (t), failure rate G gd .

[0084] Coupler, corresponding reliability parameter: reliability is K oh (t), unreliability is B oh (t), failure rate G oh .

[0085] The polarizer has the following reliability parameter: reliability is K. qp (t), unreliability is B qp (t), failure rate G qp .

[0086] Phase modulator, corresponding reliability parameter: reliability is K xw (t), unreliability is B xw (t), failure rate G xw .

[0087] Polarization-maintaining fiber, corresponding reliability parameter: reliability is K bp (t), unreliability is B bp(t), failure rate G bp .

[0088] The reliability parameter for a quarter-wave plate is: reliability is K. 41 (t), unreliability is B 41 (t), failure rate G 41 .

[0089] The reliability parameter for the reflector is: reliability is K. fs (t), unreliability is B fs (t), failure rate G fs .

[0090] The reliability parameter for the fiber optic sensing loop is: reliability is K. gx (t), unreliability is B gx (t), failure rate G gx .

[0091] The drive circuit, and its corresponding reliability parameter: reliability is K. qd (t), unreliability is B qd (t), failure rate G qd .

[0092] Preamplifier, corresponding reliability parameter: reliability is K qf (t), unreliability is B qf (t), failure rate G qf .

[0093] The reliability parameter for the A / D module is K. ad (t), unreliability is B ad (t), failure rate G ad .

[0094] The signal processing unit has the following reliability parameter: reliability is K. xh (t), unreliability is B xh (t), failure rate G xh .

[0095] The D / A module has the following reliability parameter: reliability is K. da (t), unreliability is B da (t), failure rate G da .

[0096] Step S102: Calculate the reliability of each component contained in the first optical path, the second optical path, and the first circuit according to their reliability, and construct the failure rate models of the first optical path, the second optical path, and the first circuit according to the reliability.

[0097] It should be noted that in optical path 1 (the first optical path), the failure of any single component will render optical path 1 inoperable. Therefore, in the reliability model, the modules are connected in series. The reliability model of optical path 1 is as follows: Figure 3 As shown.

[0098] Let the optical path 1 subsystem have the following reliability parameter: reliability is K. g1 (t), unreliability is B g1 (t), failure rate G g1 Based on the reliability model and mathematical statistics of optical path 1, the reliability of optical path 1 can be expressed as:

[0099] K g1 (t)=K gy (t)×K oh (t)×K qp (t)×K gd (t)

[0100] Since K(t) = e -Gt We can obtain:

[0101] K g1 (t)=e -Ggyt ×e -Goht ×e -Gqpt ×e -Ggdt＝ e -(Ggy+Goh+Gqp+Ggd)t

[0102] And because of K g1 (t)=e -Gg1t The failure rate model for optical path 1 is as follows:

[0103] G g1 =G gy +G oh +G qp +G gd

[0104] K g1 (t)=e -Gg1

[0105] B g1 (t)=1-K g1 (t)

[0106] Similarly, in optical path 2 (the second optical path), the failure of any single component will render optical path 2 inoperable. Therefore, in the reliability model, the modules are connected in series. The reliability model of optical path 2 is as follows: Figure 4 As shown. Simultaneously, consider the optical path 2 subsystem, with the corresponding reliability parameter: reliability is K. g2 (t), unreliability is B g2 (t), failure rate G g2.

[0107] Based on the reliability model and mathematical statistics of optical path 2, the reliability of optical path 2 can be expressed as:

[0108] K g2 (t)=K fs (t)×K gx (t)×K 41 (t)×K bp (t)

[0109] Since K(t) = e -Gt We can obtain:

[0110] K g2 (t)=e -Gfst ×e -Ggxt ×e -G41t ×e -Gbpt＝ e -(Gfs+Ggx+G41+Gbp)t

[0111] And because of K g2 (t)=e -Gg2t The failure rate model for optical path 2 is as follows:

[0112] G g2 =G fs +G gx +G 41 +G bp

[0113] K g2 (t)=e -Gg2

[0114] B g2 (t)=1-K g2 (t)

[0115] according to Figure 2 The optical path of the all-fiber current transformer includes optical path 1 subsystem, a phase modulator, and optical path 2 subsystem. Assume the reliability of the optical path system is K. g (t), unreliability is B g (t), the reliability model of the optical path system is as follows Figure 5 As shown.

[0116] The system cannot function if any single component of optical path 1, optical path 2, or the phase modulator malfunctions; therefore, the reliability parameter is:

[0117] K g (t)=K g1 (t)×K xw (t)×K g2 (t)=e -(Gg1+Gxw+Gg2)t

[0118] Bg (t)=1-K g (t)

[0119] Furthermore, in some embodiments, the circuit cannot function if any single component fails. Therefore, in the reliability model, the modules are connected in series. The reliability model of the first circuit is as follows: Figure 6 As shown.

[0120] Let the circuit system have the following reliability parameter: reliability is K. d (t), unreliability is B d (t), failure rate G d Based on circuit reliability models and mathematical statistics, the reliability of a circuit can be expressed as:

[0121] K d (t)=K qd (t)×K qf (t)×K ad (t)×K xh (t)×K da (t)

[0122] Since K(t) = e -Gt We can obtain:

[0123] K d (t)=e -(Gqd+Gqf+Gad+Gxh+Gda)t

[0124] And because of K d (t)=e -Gdt The failure rate model for the first circuit is as follows:

[0125] G d =G qd +G qf +G ad +G xh +G da

[0126] K d (t)=e -Gd

[0127] B d (t)=1-K d (t).

[0128] Step S103: Redundancy design is performed on the first optical path, the second optical path and the first circuit, and a second reliability model of the multi-redundant all-fiber current transformer is constructed based on the design results. The second reliability model includes the first redundant optical path, the second redundant optical path and the first redundant circuit.

[0129] It should be noted that, since the safe operation of DC systems is crucial to power safety, and the reliability of all-fiber current transformers is also crucial to the safe operation of DC systems, current all-fiber current transformers often employ multiple redundancy schemes in their circuit and optical paths to improve reliability. Assuming the optical path of an all-fiber current transformer is N-redundant and the circuit is M-redundant, the second reliability model of a multi-redundant all-fiber current transformer is as follows: Figure 7 As shown.

[0130] Step S104: Calculate the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second redundant optical path, and the first redundant circuit, and calculate the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit.

[0131] In this step, we assume an all-fiber current transformer with the following reliability parameters: reliability is K(t), and unreliability is B(t).

[0132] Let the first redundant optical path have the following reliability parameter: reliability is K. N1 (t), unreliability is B N1 (t).

[0133] Let the second redundant optical path have the following reliability parameter: reliability is K. N2 (t), unreliability is B N2 (t).

[0134] Suppose there is an M redundant circuit, with the corresponding reliability parameter: reliability is K. M (t), unreliability is B M (t).

[0135] According to mathematical statistics, the unreliability of the first redundant optical path can be expressed as:

[0136] B N1 (t)=(1-K g1 (t)) N =(1-e -Gg1 ) N

[0137] The reliability is then:

[0138] K N1 (t)=1-B N1 (t)=1-(1-e -Gg1 ) N

[0139] Similarly, the unreliability of the second redundant optical path can be expressed as:

[0140] BN2 (t)=(1-e -Gg2 ) N

[0141] The reliability is then:

[0142] K N2 (t)=1-(1-e -Gg2 ) N

[0143] Similarly, the unreliability of an M-redundant circuit can be expressed as:

[0144] B M (t)=(1-e -Gd ) M

[0145] The reliability is then:

[0146] K M (t)=1-(1-e -Gd ) M

[0147] Based on the reliability model and mathematical statistics methods of all-fiber current transformers, the reliability can be expressed as:

[0148] K(t)=K N1 (t)×K xw (t)×K N2 (t)×K M (t)

[0149] And the unreliability is:

[0150] B(t) = 1 - K(t).

[0151] In summary, the reliability calculation method for multi-redundant all-fiber current transformers provided by this invention achieves accurate quantification and effective improvement of system reliability by constructing a complete reliability assessment system and introducing an intelligent redundancy design mechanism. This method first establishes a full-element reliability model including optical and circuit components, and calculates the failure rate of each subsystem using a series formula; then, it employs parallel redundancy design to significantly reduce system unreliability. For example, triple redundancy can reduce the optical path unreliability from 10... -3 Reduced to 10 -9 Ultimately, through comprehensive system-level reliability analysis, the overall availability is ensured to reach over 99.999%. Compared to traditional methods, this invention features high computational accuracy, precise fault location, and significant optimization effects, providing a scientific basis and technical support for the reliability design and maintenance of key measurement equipment in power systems.

[0152] like Figure 8As shown, an embodiment of the present invention also proposes a reliability calculation system for a multi-redundant all-fiber current transformer, the system comprising:

[0153] The first model construction module 10 is used to obtain the optical path composition and the first circuit contained in the all-fiber current transformer. The optical path composition includes a first optical path and a second optical path. Based on the topological relationship of the first optical path, the second optical path and the first circuit, a first reliability model of each component in the all-fiber current transformer is constructed. The first reliability model includes the reliability, unreliability and failure rate of each component.

[0154] The failure rate model construction module 20 is used to calculate the reliability of each component contained in the first optical path, the second optical path, and the first circuit, and to construct the failure rate models of the first optical path, the second optical path, and the first circuit based on the reliability.

[0155] The second model construction module 30 is used to perform redundant design on the first optical path, the second optical path and the first circuit, and to construct a second reliability model of the multi-redundant all-fiber current transformer based on the design results. The second reliability model includes a first redundant optical path, a second redundant optical path and a first redundant circuit.

[0156] The parameter calculation module 40 is used to calculate the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second redundant optical path, and the first circuit, and to calculate the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit.

[0157] In another aspect, the present invention also proposes a storage medium on which one or more programs are stored, which, when executed by a processor, implement the above-described reliability calculation method for multi-redundant all-fiber current transformers.

[0158] In another aspect, the present invention also proposes an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to realize the above-mentioned reliability calculation method for a multi-redundant all-fiber current transformer.

[0159] Those skilled in the art will understand that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can mean any means that can contain stored, communicated, propagated, or transmitted programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0160] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0161] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0162] While embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of the invention as set forth in the claims. Furthermore, the invention described herein may have other embodiments and can be implemented or carried out in various ways.

Claims

1. A reliability calculation method for a multi-redundant all-fiber current transformer, characterized in that, The method includes: The optical path composition and first circuit of the all-fiber current transformer are obtained. The optical path composition includes a first optical path and a second optical path. Based on the topological relationship of the first optical path, the second optical path and the first circuit, a first reliability model of each component in the all-fiber current transformer is constructed. The first reliability model includes the reliability, unreliability and failure rate of each component. The reliability of each component in the first optical path, the second optical path, and the first circuit is calculated based on the reliability of each component, and a failure rate model for the first optical path, the second optical path, and the first circuit is constructed based on the reliability. Redundancy design is performed on the first optical path, the second optical path, and the first circuit. Based on the design results, a second reliability model of a multi-redundant all-fiber current transformer is constructed. The second reliability model includes the first redundant optical path, the second redundant optical path, and the first redundant circuit. The reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit are calculated based on the failure rate model of the first optical path, the second redundant optical path, and the first redundant circuit. The reliability and unreliability of the second reliability model are then calculated based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit.

2. The reliability calculation method for a multi-redundant all-fiber current transformer according to claim 1, characterized in that, The steps of calculating the reliability of each component in the first optical path, the second optical path, and the first circuit, and constructing failure rate models for the first optical path, the second optical path, and the first circuit based on the reliability include: The reliability of the first optical path is calculated using the following formula: K g1 (t)=K gy (t)×K oh (t)×K qp (t)×K gd (t); The failure rate model of the first optical path is calculated using the following formula: G g1 =G gy +G oh +G qp +G gd ; K g1 (t)=e -Gg1 ; B g1 (t)=1-K g1 (t); Among them, K g1 (t), G g1 B g1 (t) represents the reliability, failure rate, and unreliability of the first optical path, K gy (t), G gy For the reliability and failure rate of the light source, K oh (t), G oh K represents the reliability and failure rate of the coupler. qp (t), G qp To ensure the reliability and failure rate of the polarizer, K gd (t), G gd For the reliability and failure rate of photodetectors.

3. The reliability calculation method for a multi-redundant all-fiber current transformer according to claim 2, characterized in that, The step of calculating the reliability of each component in the first optical path, the second optical path, and the first circuit based on their respective reliability, and constructing failure rate models for the first optical path, the second optical path, and the first circuit based on the reliability, further includes: The reliability of the second optical path is calculated using the following formula: K g2 (t)=K fs (t)×K gx (t)×K 41 (t)×K bp (t); The failure rate model of the second optical path is constructed based on the following formula: G g2 =G fs +G gx +G 41 +G bp ; K g2 (t)=e -Gg2 ; B g2 (t)=1-K g2 (t); Among them, K g2 (t), G g2 B g2 (t) represents the reliability, failure rate, and unreliability of the second optical path, and K fs (t), G fs For the reliability and failure rate of the reflector, K gx (t), G gx K represents the reliability and failure rate of the fiber optic sensing loop. 41 (t), G 41 K represents the reliability and failure rate of a quarter-wave plate. bp (t), G bp To ensure the reliability and failure rate of polarization-maintaining optical fibers.

4. The reliability calculation method for a multi-redundant all-fiber current transformer according to claim 3, characterized in that, The step of calculating the reliability of each component in the first optical path, the second optical path, and the first circuit based on their respective reliability, and constructing failure rate models for the first optical path, the second optical path, and the first circuit based on the reliability, further includes: The reliability of the first circuit is calculated using the following formula: K d (t)=K qd (t)×K qf (t)×K ad (t)×K xh (t)×K da (t); Construct the failure rate model for the first circuit based on the following formula: G d =G qd +G qf +G ad +G xh +G da ; K d (t)=e -Gd ; B d (t)=1-K d (t); Among them, K d (t), G d B d (t) represents the reliability, failure rate, and unreliability of the first circuit, K qd (t), G qd For the reliability and failure rate of the drive circuit, K qf (t), G qf For the reliability and failure rate of the preamplifier, K ad (t), G ad K represents the reliability and failure rate of the A / D module. xh (t), G xh K represents the reliability and failure rate of the signal processing unit. da (t), G da For the reliability and failure rate of the D / A module.

5. The reliability calculation method for a multi-redundant all-fiber current transformer according to claim 4, characterized in that, The steps of calculating the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second optical path, and the first circuit include: The unreliability of the first redundant optical path is expressed as: B N1 (t)=(1-K g1 (t)) N =(1-e -Gg1 ) N ; The reliability of the first redundant optical path is: K N1 (t)=1-B N1 (t)=1-(1-e -Gg1 ) N ; The unreliability of the second redundant optical path is expressed as: B N2 (t)=(1-e -Gg2 ) N ; The reliability of the second redundant optical path is: K N2 (t)=1-(1-e -Gg2 ) N ; The unreliability of the first redundant circuit is expressed as: B M (t)=(1-e -Gd ) M ; The reliability of the first redundant circuit is: K M (t)=1-(1-e -Gd ) M ; Among them, B N1 (t), K N1 (t) represents the unreliability and reliability of the first redundant optical path, B N2 (t), K N2 (t) represents the unreliability and reliability of the second redundant optical path, respectively, and B M (t), K M (t) represents the unreliability and reliability of the first redundant circuit, respectively; N represents the number of first optical paths included in the first redundant optical path; and M represents the number of second optical paths included in the second redundant optical path.

6. The reliability calculation method for a multi-redundant all-fiber current transformer according to claim 5, characterized in that, The steps for calculating the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit include: The reliability of the second reliability model is calculated using the following formula: K(t)=K N1 (t)×K xw (t)×K N2 (t)×K M (t); The unreliability of the second reliability model is calculated using the following formula: B(t) = 1 - K(t); Where K(t) and B(t) are the reliability and unreliability of the second reliability model, respectively, and K xw (t) represents the reliability of the phase modulator.

7. A reliability calculation system for multi-redundant all-fiber current transformers, characterized in that, The system includes: The first model construction module is used to obtain the optical path composition and the first circuit contained in the all-fiber current transformer. The optical path composition includes the first optical path and the second optical path. Based on the topological relationship of the first optical path, the second optical path and the first circuit, the first reliability model of each component in the all-fiber current transformer is constructed. The first reliability model includes the reliability, unreliability and failure rate of each component. The failure rate model construction module is used to calculate the reliability of each component contained in the first optical path, the second optical path, and the first circuit, and to construct the failure rate models of the first optical path, the second optical path, and the first circuit based on the reliability. The second model construction module is used to perform redundant design on the first optical path, the second optical path and the first circuit, and to construct a second reliability model of the multi-redundant all-fiber current transformer based on the design results. The second reliability model includes the first redundant optical path, the second redundant optical path and the first redundant circuit. The parameter calculation module is used to calculate the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit based on the failure rate model of the first optical path, the second redundant optical path, and the first circuit, and to calculate the reliability and unreliability of the second reliability model based on the reliability and unreliability of the first redundant optical path, the second redundant optical path, and the first redundant circuit.

8. A storage medium, characterized in that, The storage medium stores one or more programs that, when executed by a processor, implement the reliability calculation method for a multi-redundant all-fiber current transformer as described in any one of claims 1-6.

9. An electronic device comprising a memory and a processor, wherein: The memory is used to store computer programs; When the processor executes the computer program stored in the memory, it implements the reliability calculation method for the multi-redundant all-fiber current transformer as described in any one of claims 1-6.

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