CN115372880A - Light path testing system and fault point detection method of reflective all-fiber current transformer - Google Patents
Light path testing system and fault point detection method of reflective all-fiber current transformer Download PDFInfo
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Abstract
The application relates to a light path testing system and a fault point detecting method of a reflective all-fiber current transformer. The system comprises: optical fiber analyzer, optical fiber polarizer, polarization maintaining optical fiber coupler, optical power measuring module and light source module, wherein: the light source module is connected with the polarization-maintaining fiber coupler through the fiber polarizer; the input end of the polarization-maintaining optical fiber coupler receives an optical signal output by the optical fiber polarizer, and the input and output composite end of the polarization-maintaining optical fiber coupler outputs the optical signal to a light path to be detected and receives the optical signal returned from the light path to be detected; the output end of the polarization-maintaining optical fiber coupler outputs an optical signal returned by the optical path to be measured to the optical power measuring module through the optical fiber polarization analyzer; and rotating the optical fiber analyzer to adjust the optical fiber analyzer, and measuring the obtained optical power value through the optical power measuring module to obtain the extinction ratio of the optical path to be measured. The system can detect the fault point of the current transformer in time and improve the reliability and efficiency of field construction.
Description
Technical Field
The application relates to the field of light path testing, in particular to a light path testing system and a fault point detection method of a reflective all-fiber current transformer.
Background
In the field of current transformer testing, the all-fiber current transformer is used as a current mainstream measuring medium, accurate and reliable measuring information is provided for control and protection of a system, the running reliability and the measuring accuracy of the all-fiber current transformer are directly related to safe and stable running of a direct-current power transmission system, and meanwhile, a basis is provided for analysis and judgment when the system fails. Since all-fiber current transformers were imported in the early years, the failure rate was high since 2012, and the improvement of the reliability of all-fiber current transformers has become the focus of attention of the power grid industry. With the continuous maturity of domestic technologies, the domestic closed-loop reflective all-fiber current transformer with high precision, fast response and wide frequency band becomes the future development trend.
In the prior art, a reflective all-fiber current transformer generally comprises a primary sensing unit, a polarization maintaining optical cable and an acquisition unit, wherein during field construction of the reflective all-fiber current transformer, the primary sensing unit is installed at a high-voltage side, the acquisition unit is installed in a control room screen cabinet, and the polarization maintaining optical cable is laid in a cable trench between the high-voltage side and a low-voltage side. When the fiber is fused, one end of the polarization maintaining optical cable, which is positioned on the high-voltage side, is fused with the primary sensing unit, one end of the polarization maintaining optical cable, which is positioned on the low-voltage side, is fused with the acquisition unit, and the acquisition unit is used for debugging the operation parameters of the system and evaluating the loss of the optical path.
However, in the conventional method, when the polarization maintaining optical fiber is fused, all fused fiber points at two ends of the polarization maintaining optical fiber need to be completely fused and then detected through the acquisition unit, if the fused fiber points are not qualified, fault points cannot be determined, and the fault points need to be checked one by one, so that the efficiency is low.
Disclosure of Invention
Therefore, it is necessary to provide an optical path testing system and a fault point detecting method for a reflective all-fiber current transformer, which can perform an extinction ratio test on the reflective all-fiber current transformer, in order to solve the above technical problems.
In a first aspect, the present application provides an optical path testing system, where the system includes: the method comprises the following steps: optical fiber analyzer, optical fiber polarizer, polarization maintaining optical fiber coupler, optical power measuring module and light source module, wherein:
the output end of the light source module is connected with the input end of the polarization-maintaining optical fiber coupler through the optical fiber polarizer; the input end of the polarization-maintaining optical fiber coupler receives the linearly polarized light signal output by the optical fiber polarizer, and the input and output composite end of the polarization-maintaining optical fiber coupler outputs the linearly polarized light signal to a light path to be measured and receives the linearly polarized light signal returned from the light path to be measured;
the output end of the polarization-maintaining optical fiber coupler outputs the linearly polarized light signal returned by the optical path to be measured to the optical power measuring module through the optical fiber analyzer; the optical fiber analyzer is connected between the polarization maintaining optical fiber coupler and the optical power measuring module; the input end and the output end of the optical fiber analyzer are respectively connected with an optical fiber;
and rotating the optical fiber analyzer to adjust the optical power value of the linearly polarized light signal output by the output end of the optical fiber analyzer, measuring the optical power value through the optical power measuring module, and obtaining the extinction ratio of the optical path to be measured based on the measured optical power value so as to determine whether the optical path to be measured has a fault.
In some embodiments, the optical fiber analyzer is provided with a rotating hand wheel, the rotating hand wheel rotates by 360 degrees, and the light intensity of the linearly polarized light signal returned by the optical path to be measured after passing through the optical fiber analyzer is changed by rotating the rotating hand wheel of the optical fiber analyzer.
In some embodiments, the extinction ratio of the linearly polarized light output by the optical fiber polarizer is not lower than 30dB.
In some embodiments, the input end and the output end of the polarization-maintaining fiber coupler output linearly polarized light signals returned by the optical path to be measured, where the linearly polarized light signals with 50% power are output to the fiber analyzer from the output end of the polarization-maintaining fiber coupler.
In some embodiments, the optical path testing system further includes: a bare fiber adapter; the bare fiber adapter mechanically connects the optical fiber at the output end of the polarization-maintaining fiber coupler to the optical fiber analyzer.
In some embodiments, the light source module includes a first light source or a second light source; the first light source includes an SLD light source and a light source driver, and the second light source is a desk light source having wavelength stability and power stability.
In some embodiments, the optical fiber at the input end of the optical fiber polarizer is connected with the optical fiber at the output end of the light source module by fusion; the optical fiber at the input end of the polarization-maintaining optical fiber coupler is connected with the optical fiber at the output end of the optical fiber polarizer in a fusion mode.
In a second aspect, the present application further provides a method for detecting a fault point of a reflective all-fiber current transformer, where the method includes:
before a sensing unit at the first side of a reflective all-fiber current transformer is hoisted, sequentially welding each polarization-maintaining fiber at the output end of the sensing unit with a fiber counter shaft at the output end of a test system; the output end of the test system is the input and output composite end of the polarization-maintaining optical fiber coupler;
recording the maximum value P of the optical power measured by the optical power measuring module in the rotation process of the optical fiber analyzer in the test system max1 And minimum value P min1 (ii) a Maximum value P based on the optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each polarization-maintaining optical path of the sensing unit 1 If the first optical signal extinction ratio ER corresponding to a certain polarization-maintaining optical path 1 If the value of (2) is less than the first threshold value, determining that a fault exists in the certain polarization-maintaining optical path in the sensing unit;
if the first optical signal extinction ratio ER corresponding to each set of polarization-maintaining optical path 1 If the values of the two optical fibers are all larger than a first threshold value, determining that the test result of the sensing unit is qualified, hoisting the sensing unit, laying an armored polarization-maintaining optical cable, and fusing the optical fiber at the output end of the bottom of the reflective all-fiber current transformer with the optical fiber at the first side of the armored polarization-maintaining optical cable;
the optical fiber at the second side of the armored polarization-maintaining optical cable is welded with the optical fiber at the output end of the test system in a shaft-to-shaft mode, and the maximum value P of the optical power measured by the optical power measuring module is recorded in the rotating process of the optical fiber analyzer in the test system max2 And minimum value P min2 (ii) a Maximum value P based on the optical power max2 And minimum value P min2 Obtaining the output of each optical fibre of said armoured polarization-maintaining optical cableExtinction ratio ER of second optical signal 2 If the extinction ratio ER of the second optical signal corresponding to a certain optical fiber 2 If the value of (2) is less than the second threshold value, determining that a fault exists in the certain optical fiber in the armored polarization-maintaining optical cable;
if the extinction ratio ER of the second optical signal corresponding to each optical fiber 2 If the values of the two are all larger than the second threshold value, the test result of the armored polarization-maintaining optical cable is determined to be qualified, and the optical fiber on the second side of the armored polarization-maintaining optical cable is welded with the optical fiber counter shaft of the acquisition unit of the reflection type all-fiber current transformer according to requirements.
In some embodiments, the recording of the maximum and minimum values of the optical power measured by the optical power measurement module during the rotation of the optical fiber analyzer in the test system includes: and rotating the rotating hand wheel of the optical fiber analyzer by 360 degrees, and recording the maximum value and the minimum value of the optical power measured by the optical power measuring module.
In some embodiments, the maximum value P based on the optical power is as described above max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each polarization-maintaining optical path of the sensing unit 1 The method comprises the following steps: obtaining the maximum value P of the optical power max1 And a minimum value P min1 The ratio of (A) to (B); based on the ratio, determining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the sensing unit 1 (ii) a The larger the ratio is, the larger the extinction ratio ER of the first optical signal is 1 The larger; the maximum value P based on the optical power max2 And minimum value P min2 Obtaining the second optical signal extinction ratio ER output by each optical fiber of the armored polarization-maintaining optical cable 2 The method comprises the following steps: obtaining the maximum value P of the optical power max2 And a minimum value P min2 The ratio of (A) to (B); based on the ratio, determining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 (ii) a The larger the ratio is, the larger the extinction ratio ER of the second optical signal is 2 The larger.
Before a sensing unit on the first side of the reflective all-fiber current transformer is hoisted, carrying out extinction ratio testing on the sensing unit based on the optical path testing system, detecting whether the sensing unit has a fault or not, if the sensing unit has no fault after detection, hoisting the sensing unit, laying an armored polarization-maintaining optical cable, and fusing an optical fiber at the output end of the bottom of the reflective all-fiber current transformer with an optical fiber on the first side of the armored polarization-maintaining optical cable; carrying out extinction ratio test on the armored polarization-maintaining optical cable based on the optical path test system, detecting whether the armored polarization-maintaining optical cable has faults or not, and if the armored polarization-maintaining optical cable does not have faults after detection, completing optical fiber on the low-voltage side of the armored polarization-maintaining optical cable and optical fiber counter-shaft welding of an acquisition unit of the reflective all-fiber current transformer according to requirements; by testing the extinction ratio of the reflective all-fiber current transformer before and after hoisting, fault detection is timely carried out on a light path, the testing efficiency and the operation and maintenance reliability of the reflective all-fiber current transformer are improved, and the abnormal risk of measurement is reduced.
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For a better description and illustration of those embodiments and examples disclosed herein, reference may be made to one or more of the drawings. The additional details or examples used to describe the figures should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the presently understood best modes of these inventions.
FIG. 1 is a block diagram of an optical circuit testing system according to an embodiment;
FIG. 2 is a schematic flow chart illustrating an application of the optical path testing system in testing an optical path to be tested in one embodiment;
FIG. 3 is a schematic flow chart illustrating a method for detecting a fault point of the reflective all-fiber current transformer according to an embodiment;
fig. 4 is a logic diagram of an application of the method for detecting a fault point of the reflective all-fiber current transformer in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, an optical path testing system includes: a fiber analyzer 110, a fiber polarizer 120, a polarization maintaining fiber coupler 130, an optical power measuring module 140, and a light source module 150, wherein:
the output end of the light source module 150 is connected to the input end of the polarization maintaining fiber coupler 130 through the fiber polarizer 120; the input end of the polarization-maintaining fiber coupler 130 receives the linearly polarized light signal output by the fiber polarizer 220, and the input and output composite end of the polarization-maintaining fiber coupler 130 outputs the linearly polarized light signal to the optical path to be measured and receives the linearly polarized light signal returned from the optical path to be measured;
the output end of the polarization maintaining fiber coupler 130 outputs the linearly polarized light signal returned from the optical path to be measured to the optical power measuring module 140 through the optical fiber analyzer 110; the optical fiber analyzer is connected between the polarization maintaining optical fiber coupler 130 and the optical power measuring module 140; the input end and the output end of the optical fiber analyzer 110 are respectively connected with an optical fiber;
the optical fiber analyzer 110 is rotated to adjust the optical power value of the linearly polarized signal output from the output end of the optical fiber analyzer 110, the optical power value is measured by the optical power measurement module 140, and the extinction ratio of the optical path to be measured is obtained based on the measured optical power value, so as to determine whether the optical path to be measured has a fault.
In some embodiments, the optical fiber analyzer 110 is provided with a rotating handwheel, the rotation angle of the rotating handwheel is at most 360 °, and the light intensity of the linearly polarized light signal returned by the optical path to be measured after passing through the optical fiber analyzer is changed by rotating the rotating handwheel of the optical fiber analyzer 110; the rotating hand wheel may be marked with a rotation scale for identifying a rotation angle of the rotating hand wheel, and the division value may be 10 °.
The light power value measured by the light power measuring module is changed by rotating the rotating hand wheel, so that a data basis is provided for the extinction ratio calculation.
In some embodiments, the optical signal from the light source is converted into a linearly polarized light signal with high polarization degree after passing through the optical fiber polarizer 120, and the extinction ratio of the linearly polarized light output by the optical fiber polarizer 120 is not lower than 30dB.
The extinction ratio is an important parameter for measuring the performance of the optical path, and the extinction ratio of the linearly polarized light output by the optical fiber polarizer 120 is not lower than 30dB, so that the requirement of engineering on a high extinction ratio project can be met, the production cost is saved, and the reliability of the optical path is ensured.
In some embodiments, the linearly polarized light signal returned from the optical path to be measured, which enters the input and output composite end of the polarization maintaining fiber coupler 130, wherein the linearly polarized light signal with 50% power is output to the fiber analyzer 110 from the output end of the polarization maintaining fiber coupler 130.
As an example, the polarization maintaining fiber coupler 130 has a splitting ratio of 50.
The splitting ratio of the polarization maintaining fiber coupler 130 is 50:50, the lower optical path loss can be ensured, and the influence of each connector in the test system on the optical power of linearly polarized light is reduced.
In some embodiments, the optical path testing system further includes: a bare fiber adapter; the bare fiber adapter mechanically connects the optical fiber at the output end of the polarization maintaining fiber coupler 130 to the optical fiber analyzer 110.
As an example, the optical signal output from the output end of the polarization-maintaining fiber coupler 130 is still a linearly polarized optical signal.
Compared with the field fiber melting, the method has the advantages that the bare fiber adapter is used for connecting the bare fiber and the optical fiber equipment, the operation is simple and convenient, and the cost can be saved.
In some embodiments, the light source module 150 includes a first light source or a second light source; the first light source includes an SLD light source and a light source driver, and the second light source is a desk light source having wavelength stability and power stability.
As an example, the first light source drives the SLD light source to emit light by the light source driver, and controls the operating temperature and the optical power of the light source; the light source module can emit an optical signal with a central wavelength of 1310 nm.
In some embodiments, the connection mode of the fiber analyzer 110 and the optical power measurement module 140 may be a single-mode jumper connection.
In some embodiments, the optical fiber at the input end of the optical fiber polarizer 110 is connected to the optical fiber at the output end of the light source module 150 by fusion; the optical fiber at the input end of the polarization maintaining optical fiber coupler 130 and the optical fiber at the output end of the optical fiber polarizer 120 are connected by fusion.
In one embodiment, the steps of the optical path testing system applied in the test extinction ratio test of the optical path to be tested are shown in fig. 2.
As an example, a specific method for testing the extinction ratio of the optical fiber loop of the all-fiber current transformer by using the optical path testing system is as follows:
s210, starting a light source module, confirming whether a reading exists in a light power measuring module, and ensuring that a light path is smooth and has no abnormity;
s220, rotating a rotating hand wheel of the 360-degree manual optical fiber analyzer, and recording the maximum value P of the optical power measured by the optical power measuring module max And minimum value P min ；
And S230, obtaining the extinction ratio of the optical path through an extinction ratio calculation formula.
The optical path testing system is used for testing the extinction ratio of the optical fiber current transformer optical fiber loop, is simple to operate, can save cost compared with an extinction ratio tester, and is suitable for large-scale engineering popularization.
Based on the optical path testing system, the embodiment of the application further provides a fault point detection method for the reflective all-fiber current transformer, wherein the optical path testing system can be applied to the fault point detection method for the reflective all-fiber current transformer, and can detect the fault point of the reflective all-fiber current transformer.
In one embodiment, as shown in fig. 3, a method for detecting a fault point of a reflective all-fiber current transformer includes the following steps:
s310, before a sensing unit on the first side of the reflective all-fiber current transformer is hoisted, sequentially welding each polarization maintaining fiber at the output end of the sensing unit with a fiber counter shaft at the output end of a test system; the output end of the test system is the input-output composite end of the polarization-maintaining optical fiber coupler.
As an example, as shown in fig. 4, the reflective all-fiber current transformer may be composed of a primary sensing unit, a polarization-maintaining optical cable, and an acquisition unit, where during field construction of the reflective all-fiber current transformer, the primary sensing unit may be installed on the high-voltage side, the acquisition unit may be installed in the control room cabinet, and the polarization-maintaining optical cable may be laid in the cable trench between the high-voltage side and the low-voltage side.
As an example, before the high-voltage side sensing unit of the reflective all-fiber current transformer is hoisted, each polarization maintaining fiber at the output end of the sensing unit is sequentially welded to the fiber pair axis at the output end of the test system by using a polarization maintaining fiber welding machine, and after each polarization maintaining fiber at the output end of the high-voltage side sensing unit is sequentially welded to the fiber pair axis at the output end of the test system, the high-voltage side sensing unit and the test system can form a polarization maintaining optical path.
S320, recording the maximum value P of the optical power measured by the optical power measuring module in the rotation process of the optical fiber analyzer in the test system max1 And minimum value P min1 (ii) a Maximum value P based on the optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each polarization-maintaining optical path of the sensing unit 1 If the first optical signal extinction ratio ER corresponding to a certain polarization-maintaining optical path 1 If the value of (2) is less than the first threshold value, determining that a fault exists in the certain polarization-maintaining optical path in the sensing unit.
As an example, the optical fiber analyzer may be composed of a polarizing film, the optical fiber analyzer may be provided with a rotating hand wheel, which can realize 360 ° rotation of polarization detection, and when the rotating hand wheel is rotated, the polarizing film also rotates along with the rotating hand wheel, thereby changing the intensity of the transmitted linearly polarized light; the optical power measurement module includes but is not limited to an optical power meter or an optical oscilloscope; the extinction ratio can be an index reflecting the performance of the optical path, and the fault point of the optical path can be detected through the extinction ratio; the first threshold may be specifically specified by industry standards or project requirements.
As an example, the linearly polarized light signal returned by the optical path to be measured is input to the optical power measurement module through the optical fiber analyzer, and the maximum value P of the optical power is obtained and recorded max1 And minimum value P min1 Based on the maximum value P of the optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the high-voltage side sensing unit 1 If the first optical signal extinction ratio ER corresponding to a certain polarization-maintaining optical path 1 If the value of the first optical signal extinction ratio is less than 30dB, determining that a certain polarization-maintaining optical path in the high-voltage side sensing unit has a fault, detecting whether the certain optical path in the high-voltage side sensing unit is damaged or replacing a spare optical fiber after the fault is detected, and continuously detecting until the first optical signal extinction ratio ER corresponding to each set of polarization-maintaining optical path is reached 1 Are all greater than 30dB.
S330, if the first optical signal extinction ratio ER corresponding to each set of polarization-maintaining optical path 1 If the values of the two optical fibers are all larger than the first threshold value, the test result of the sensing unit is determined to be qualified, the sensing unit is hoisted, an armored polarization-maintaining optical cable is laid, and the optical fibers at the output end of the bottom of the reflective all-fiber current transformer are welded with the optical fibers at the first side of the armored polarization-maintaining optical cable.
As an example, the armored polarization-maintaining optical cable may be a polarization-maintaining optical cable that is added with a protective material to meet requirements of a project, and the armored polarization-maintaining optical cable has better strength and tensile resistance compared with a general optical cable.
As an example, if the extinction ratio ER of the first optical signal corresponding to each set of polarization-maintaining optical paths is above 1 If the values are all larger than 30dB, determining that the test result aiming at the high-voltage side sensing unit is qualified, hoisting the high-voltage side sensing unit, laying an armored polarization-maintaining optical cable, and using a polarization-maintaining optical fiber melting machine to enable the optical fiber at the output end of the bottom of the reflection type all-fiber current transformer and the armored polarization-maintaining optical cable to be in a pass testAnd welding the optical fibers on the high-voltage side of the optical cable, and starting to detect the optical path on the low-voltage side of the armored polarization-maintaining optical cable.
S340, welding the optical fiber at the second side of the armored polarization-maintaining optical cable with the optical fiber at the output end of the test system in a shaft-to-shaft manner, and recording the maximum value P of the optical power measured by the optical power measuring module in the rotation process of the optical fiber analyzer in the test system max2 And minimum value P min2 (ii) a Maximum value P based on the optical power max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 If the extinction ratio ER of the second optical signal corresponding to a certain optical fiber 2 If the value of (a) is less than the second threshold value, determining that a fault exists in the certain optical fiber in the armored polarization-maintaining optical cable.
As one example, the second threshold may be specifically specified by an industry standard or project requirement; the first threshold and the second threshold may be equal or unequal.
As an example, a polarization-maintaining optical fiber fusion machine is used to fuse the optical fiber on the low-voltage side of the armored polarization-maintaining optical cable and the optical fiber at the output end of the test system to a shaft; based on the maximum value P of the optical power measured by the optical power measuring module in the process of rotating the optical fiber analyzer rotating hand wheel for 360 degrees max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 If the extinction ratio ER of the second optical signal corresponding to a certain optical fiber 2 If the value of the first optical signal extinction ratio is smaller than the second threshold value, determining that a certain optical fiber in the armored polarization-maintaining optical cable has a fault, disconnecting a high-voltage side optical fiber melting point corresponding to the certain optical fiber, replacing a spare optical fiber in the armored polarization-maintaining optical cable, and continuously detecting until the second optical signal extinction ratio ER output by each optical fiber of the armored polarization-maintaining optical cable 2 Are all greater than 30dB.
S350, if the extinction ratio ER of the second optical signal corresponding to each optical fiber is larger than the extinction ratio ER of the second optical signal corresponding to each optical fiber 2 If the values of the first side and the second side are all larger than the second threshold value, the test result of the armored polarization-maintaining optical cable is determined to be qualified, and the optical fiber on the second side of the armored polarization-maintaining optical cable is completed as requiredAnd the optical fiber is welded with the optical fiber counter shaft of the acquisition unit of the reflective all-fiber current transformer.
As an example, if the second optical signal extinction ratio ER corresponding to each optical fiber of the polarization maintaining optical cable is used as the extinction ratio ER 2 And if the values are all larger than 30dB, determining that the test result of the armored polarization-maintaining optical cable is qualified, and fusing the optical fiber at the low-voltage side of the armored polarization-maintaining optical cable and the optical fiber counter shaft of the acquisition unit of the reflective all-fiber current transformer by using a polarization-maintaining optical fiber fusing machine according to requirements to complete detection.
According to the embodiment, before the high-voltage side sensing unit of the reflection type all-fiber current transformer is hoisted, the extinction ratio of the high-voltage side sensing unit is tested, whether the high-voltage side sensing unit has a fault or not is detected, after the fault does not exist or is detected and eliminated, the high-voltage side sensing unit is hoisted, the armored polarization-maintaining optical cable is laid, and the optical fiber at the output end of the bottom of the reflection type all-fiber current transformer is fused with the optical fiber at the high-voltage side of the armored polarization-maintaining optical cable; the method comprises the steps of carrying out extinction ratio test on an armored polarization-maintaining optical cable, detecting whether the armored polarization-maintaining optical cable has faults or not, completing butt fusion of optical fibers on the low-voltage side of the armored polarization-maintaining optical cable and optical fibers of an acquisition unit of a reflection type all-fiber current transformer according to requirements after no faults exist or faults exist and eliminating the faults after detection, carrying out extinction ratio test on the reflection type all-fiber current transformer before and after hoisting, detecting optical path faults in time, improving the test efficiency and operation and maintenance reliability of the reflection type all-fiber current transformer, and reducing abnormal measurement risks.
In one embodiment, the recording of the maximum and minimum values of the optical power measured by the optical power measurement module during rotation of the optical fiber analyzer in the test system includes: rotating the hand wheel with the scales of the optical fiber analyzer for 360 degrees; and recording the maximum value and the minimum value of the optical power measured by the optical power measuring module.
As an example, in the process of rotating the rotating handwheel of the optical fiber analyzer by 360 °, the polarizer in the optical fiber analyzer changes the intensity of the optical signal transmitted through the polarizer to realize 360 ° polarization analysis, and the basis of the optical fiber analyzer changing the intensity of the optical signal transmitted through the polarizer is malus law.
Through the embodiment, the rotating hand wheel of the optical fiber analyzer is rotated by 360 degrees, and the maximum value and the minimum value of the optical power measured by the optical power measuring module are recorded, so that the optical power of the linearly polarized light signal input to the optical power measuring module through the optical fiber analyzer can be changed, and the maximum value and the minimum value of the optical power for calculating the extinction ratio are obtained.
In one embodiment, said maximum value P based on said optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of a first optical signal output by each set of polarization-maintaining optical path of the high-voltage side sensing unit 1 The method comprises the following steps: the extinction ratio ER of a first optical signal output by each set of polarization-maintaining optical path of the high-voltage side sensing unit 1 With a maximum value P of said optical power max1 And minimum value P min1 Is related to the maximum value P of said optical power max1 And minimum value P min1 The larger the ratio of the first optical signal to the second optical signal, the larger the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the high-voltage side sensing unit 1 The larger; the maximum value P based on the optical power max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 Comprises a second optical signal extinction ratio ER output by each optical fiber of the armored polarization-maintaining optical cable 2 With a maximum value P of said optical power max2 And a minimum value P min2 Is related to the maximum value P of said optical power max2 And minimum value P min2 The larger the ratio of (A) to (B), the larger the extinction ratio ER of the second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 The larger.
As an example, the above maximum value P based on the optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the high-voltage side sensing unit 1 Can be calculated using the following formula:
ER 1 ＝10*lg(P max1 /P min1 )。
as an example, the above maximum based on optical powerValue P max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 Can be calculated using the following formula:
ER 2 ＝10*lg(P max2 /P min2 )。
by the embodiment, the corresponding extinction ratio is obtained through the calculation formula based on the maximum value and the minimum value of the optical power, the extinction ratio parameter required by fault detection can be obtained, and a fault point detection basis is provided.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. An optical path testing system, comprising: optical fiber analyzer, optical fiber polarizer, polarization maintaining optical fiber coupler, optical power measuring module and light source module, wherein:
the output end of the light source module is connected with the input end of the polarization-maintaining optical fiber coupler through the optical fiber polarizer; the input end of the polarization-maintaining optical fiber coupler receives the linearly polarized light signal output by the optical fiber polarizer, and the input and output composite end of the polarization-maintaining optical fiber coupler outputs the linearly polarized light signal to a light path to be detected and receives the linearly polarized light signal returned from the light path to be detected;
the output end of the polarization-maintaining optical fiber coupler outputs the linearly polarized light signal returned by the optical path to be measured to the optical power measuring module through the optical fiber polarization analyzer; the optical fiber analyzer is connected between the polarization-maintaining optical fiber coupler and the optical power measuring module; the input end and the output end of the optical fiber analyzer are respectively connected with an optical fiber;
and rotating the optical fiber analyzer to adjust the optical power value of the linearly polarized light signal output by the output end of the optical fiber analyzer, measuring the optical power value through the optical power measuring module, and obtaining the extinction ratio of the optical path to be measured based on the optical power value obtained by measurement so as to determine whether the optical path to be measured has a fault.
2. The test system of claim 1, wherein the optical fiber analyzer is provided with a rotating hand wheel, the rotating hand wheel has a rotating angle of 360 degrees, and the light intensity of the linearly polarized light signal returned by the optical path to be tested after passing through the optical fiber analyzer is changed by rotating the rotating hand wheel of the optical fiber analyzer.
3. The test system of claim 1, wherein the extinction ratio of linearly polarized light output by the fiber polarizer is not less than 30dB.
4. The test system according to claim 1, wherein the linearly polarized light signal returned by the optical path to be tested and entered by the input and output composite end of the polarization-maintaining optical fiber coupler is output from the output end of the polarization-maintaining optical fiber coupler to the optical fiber analyzer at a power of 50%.
5. The test system of claim 1, further comprising: a bare fiber adapter;
and the bare fiber adapter is used for mechanically connecting the optical fiber at the output end of the polarization-maintaining optical fiber coupler with the optical fiber polarization analyzer.
6. The test system of claim 1, wherein the light source module comprises a first light source or a second light source; the first light source comprises an SLD light source and a light source driver, and the second light source is a table light source with wavelength stability and power stability.
7. The test system of claim 1, wherein the optical fiber at the input end of the optical fiber polarizer is connected to the optical fiber at the output end of the light source module by fusion; the optical fiber at the input end of the polarization-maintaining optical fiber coupler is connected with the optical fiber at the output end of the optical fiber polarizer in a fusion mode.
8. A fault point detection method of a reflective all-fiber current transformer is characterized by comprising the following steps:
before a sensing unit at one side of a reflective all-fiber current transformer is hoisted, sequentially welding each polarization maintaining fiber at the output end of the sensing unit with a fiber counter shaft at the output end of a test system; the optical path testing system according to any one of claims 1 to 7, wherein an output end of the testing system is an input-output composite end of the polarization-maintaining fiber coupler;
recording the maximum value P of the optical power measured by the optical power measuring module in the rotation process of the optical fiber analyzer in the test system max1 And minimum value P min1 (ii) a Based on the maximum value P of the optical power max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the sensing unit 1 If the extinction ratio ER of the first optical signal corresponding to a certain polarization-maintaining optical path 1 If the value of (2) is less than the first threshold value, determining that a fault exists in the certain polarization-maintaining optical path in the sensing unit;
if the first optical signal extinction ratio ER corresponding to each set of polarization-maintaining optical path 1 If the values of the two signals are larger than the first threshold value, determining that the test result of the sensing unit is qualified, hoisting the sensing unit, laying an armored polarization-maintaining optical cable, and fusing the optical fiber at the output end of the bottom of the reflective all-fiber current transformer with the optical fiber at the first side of the armored polarization-maintaining optical cable;
welding the optical fiber at the second side of the armored polarization-maintaining optical cable with the optical fiber at the output end of the test system in a shaft-to-shaft manner, and recording the maximum value P of the optical power measured by the optical power measuring module in the rotation process of the optical fiber analyzer in the test system max2 And minimum value P min2 (ii) a Based on the maximum value P of the optical power max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 If the second optical signal extinction ratio ER corresponding to a certain optical fiber 2 If the value of (2) is less than the second threshold value, determining that a fault exists in the certain optical fiber in the armored polarization-maintaining optical cable;
if the extinction ratio ER of the second optical signal corresponding to each optical fiber 2 If the values of the two are all larger than the second threshold value, the test result of the armored polarization-maintaining optical cable is determined to be qualified, and the optical fiber on the second side of the armored polarization-maintaining optical cable is welded with the optical fiber counter shaft of the acquisition unit of the reflection type all-fiber current transformer according to requirements.
9. The method of claim 8, wherein the recording of the maximum and minimum values of the optical power measured by the optical power measurement module during the rotation of the optical fiber analyzer in the test system comprises:
and rotating a rotating hand wheel of the optical fiber analyzer by 360 degrees, and recording the maximum value and the minimum value of the optical power measured by the optical power measuring module.
10. The method of claim 8, wherein the maximum value P based on the optical power is determined by a threshold value max1 And minimum value P min1 Obtaining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the sensing unit 1 The method comprises the following steps:
obtaining the maximum value P of the optical power max1 And a minimum value P min1 The ratio of (a) to (b);
based on the ratio, determining the extinction ratio ER of the first optical signal output by each set of polarization-maintaining optical path of the sensing unit 1 (ii) a The larger the ratio is, the larger the extinction ratio ER of the first optical signal is 1 The larger;
the maximum value P based on the optical power max2 And minimum value P min2 Obtaining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 The method comprises the following steps:
obtaining the maximum value P of the optical power max2 And a minimum value P min2 The ratio of (A) to (B);
based on the ratio, determining the extinction ratio ER of a second optical signal output by each optical fiber of the armored polarization-maintaining optical cable 2 (ii) a The larger the ratio is, the larger the extinction ratio ER of the second optical signal is 2 The larger.
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