Vibration test method and system for polarization-maintaining optical cable of optical fiber current transformer

Abstract

The invention discloses a vibration test method and system for a polarization-maintaining optical cable of an optical fiber current transformer, and the method comprises the steps: laying the polarization-maintaining optical cable in an optical cable groove box, and enabling the polarization-maintaining optical cable to be connected with an optical fiber current sensor and an acquisition unit; injecting current into the optical fiber current sensor, and transmitting an output signal of the optical fiber current sensor to the acquisition unit through the polarization-maintaining optical cable; based on the heavy object falling test scheme, carrying out a heavy object falling test on the polarization-maintaining optical cable to obtain a heavy object falling output signal; based on the vibration table impact vibration test scheme, performing a vibration table impact vibration test on the polarization maintaining optical cable to obtain a vibration table impact vibration output signal; based on the vibration table sweep frequency vibration test scheme, performing a vibration table sweep frequency vibration test on the polarization maintaining optical cable to obtain a vibration table sweep frequency vibration output signal; and respectively determining anti-vibration effects of the test schemes, and guiding anti-vibration measures of the polarization maintaining optical cable based on the anti-vibration effects.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber mutual inductor detection, and more particularly to a method and system for vibration testing of a polarization-maintaining optical cable of an optical fiber current mutual inductor. Background Art

[0002] Fiber-optic current transformers (FOCTs), based on the Faraday magneto-optical effect and Ampere's law, use optical fibers as sensing elements and contain numerous electronic and optical components. In 2012, Suzhou Station first implemented FOCTs in a DC project. In recent years, with their widespread adoption in new projects, their deployment has steadily increased. By 2024, State Grid Corporation of China had installed a total of 6,079 FOCTs in 33 operational DC projects (excluding the Zhoushan project) and 62 converter stations. FOCTs accounted for 2,214 of these, representing 36.4%. In actual operation, FOCTs frequently experience invalid data and automatic shutdown due to vibration, posing a significant threat to the stable operation of the DC system. For example, at Deyang Station, the modulator tank and rain cover of an FOCT came into contact due to wind, causing vibrations that abruptly shifted the measured current and resulted in DC lockout. At Zhengping Station, the FOCT's sensor fiber shifted due to vibration during transportation, resulting in invalid data output.

[0003] The on-site failure revealed that existing standards failed to effectively assess the vibration performance of fiber-optic current transformers (FOCTs). Consequently, the China Electric Power Research Institute (CEPRI) spearheaded the revision of the industry standard DL / T 1789-2017, "Technical Specifications for Fiber-Optic Current Transformers." To assess the impact of vibration on FOCTs, Appendix D of the industry standard DL / T 1789-2024, "Technical Specifications for Fiber-Optic Current Transformers," specifies vibration test methods for the primary and secondary components of FOCTs. These tests, conducted on the primary and secondary data acquisition units, respectively, were conducted on the FOCTs' primary components and vibration endurance tests. This testing can effectively improve the FOCTs' vibration resistance and prevent similar failures at Deyang and Zhengping stations.

[0004] However, in 2023, the fiber optic current transformer cable at the Shaanxi North Station was affected by the impact vibration caused by the falling fireproof partition in the cable trench, resulting in abnormal output. The fault fiber optic current transformer adopts a high-speed closed-loop feedback technology route based on LiNbO3 phase modulator. The engineering application solution is as follows: Figure 1 shown.

[0005] The primary body of the fiber optic current transformer is suspended or free-standing in an outdoor high-voltage field to sense the primary current flowing through the core tube. The fiber optic current transformer acquisition unit panel is arranged in the low-voltage control room, emitting optical signals while receiving return optical signals and demodulating the primary current. The primary body and the acquisition unit are connected by an armored polarization-maintaining optical cable, which is usually arranged in a trough box in an underground cable trench to transmit optical signals back and forth.

[0006] The two ends of the armored polarization-maintaining optical cable are respectively connected to the primary polarization-maintaining optical cable and the acquisition unit polarization-maintaining optical fiber through axis fusion to form a complete polarization-maintaining optical path; the fiber fusion point of the primary polarization-maintaining optical cable and the transmission polarization-maintaining optical cable is arranged in the external hanging box for protection; the fiber fusion point of the acquisition unit polarization-maintaining optical fiber and the transmission polarization-maintaining optical cable is arranged in the fiber fusion box in the screen cabinet for protection, such as Figure 2 shown.

[0007] The transmission polarization-maintaining optical cable adopts a reinforced armored polarization-maintaining optical cable with a full dielectric structure to improve the compressive and tensile strength of the polarization-maintaining optical fiber. The structural diagram is shown in the figure below. Figure 3 shown.

[0008] The reinforced armored polarization-maintaining optical cable contains non-metallic strength core and aramid strength elements, which give the cable excellent tensile and bending resistance. The outer sheath material is corrosion-resistant, waterproof, UV-resistant, flame-retardant, and environmentally friendly, ensuring normal operation of the equipment at temperatures of -40°C and when the external pipeline is frozen.

[0009] The mechanism by which impact forces affect polarization-maintaining optical fibers is due to the time non-reciprocity of the optical path. In a small section of optical fiber, the additional phase difference caused by external impact interference can be expressed as:

[0010]

[0011] Where: l p is the length of the optical fiber affected by the impact; L B is the beat length of the optical fiber; V b is the impact strength, Indicates the change of the bat length with the intensity of the impact force; Represents the change of impact force over time; τ0 represents the time delay between the impact interference point and the reflector.

[0012] In the formula Determined by the characteristics of the optical fiber material, it can be regarded as a constant coefficient related to the impact interference. It is related to the impact acceleration and impact force intensity, and τ0 is determined by the fiber length from the impact point to the fiber reflector.

[0013] After analysis, it was found that the demodulation error caused by the impact force was related to two main factors at the equipment installation site:

[0014] (1) Impact acceleration and intensity. The greater the impact acceleration and intensity, the The larger the value, the greater the impact disturbance current caused, which can be suppressed by vibration reduction measures.

[0015] (2) Resonance: When the impact force acts on the optical cable, it may cause the optical cable to resonate, making the impact force effect The resonance is suppressed by wrapping and tightening the optical cable.

[0016] The vibration test specified in the existing standards is only for the primary body and secondary acquisition unit, and lacks vibration testing for the transmission optical cable. Therefore, it is necessary to propose an effective vibration test method to evaluate the impact of vibration on the performance of optical fiber current transformer based on LiNbO3 phase modulator and propose effective vibration reduction measures.

[0017] Therefore, a technology is needed to implement vibration testing of polarization-maintaining optical cables for optical fiber current transformers. Summary of the Invention

[0018] The technical solution of the present invention provides a method and system for vibration testing of a polarization-maintaining optical cable of an optical fiber current transformer, so as to solve the problem of how to perform vibration testing on a polarization-maintaining optical cable of an optical fiber current transformer.

[0019] In order to solve the above problems, the present invention provides a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer, the method comprising:

[0020] Laying a polarization-maintaining optical cable flat in an optical cable trough, connecting a first end of the polarization-maintaining optical cable to a fiber optic current sensor, and connecting a second end of the polarization-maintaining optical cable to a collection unit; adjusting parameters of the fiber optic current sensor to a working state, injecting current into the fiber optic current sensor, and transmitting an output signal of the fiber optic current sensor to the collection unit via the polarization-maintaining optical cable;

[0021] Based on a preset heavy object drop test scheme, performing a heavy object drop test on the polarization-maintaining optical cable to obtain a heavy object drop output signal of the optical fiber current sensor under different heavy object drop test schemes;

[0022] Based on a preset vibration table shock vibration test scheme, performing a vibration table shock vibration test on the polarization-maintaining optical cable, and obtaining vibration table shock vibration output signals of the optical fiber current sensor under different vibration table shock vibration test schemes;

[0023] Based on a preset vibration table sweep frequency vibration test scheme, performing a vibration table sweep frequency vibration test on the polarization-maintaining optical cable, and obtaining the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes;

[0024] The anti-vibration effects of the heavy object falling test scheme, the vibration table impact vibration test scheme and the vibration table sweep frequency vibration test scheme are determined based on the heavy object falling output signal, the vibration table impact vibration output signal and the vibration table sweep frequency vibration output signal respectively, and the anti-vibration measures of the polarization-maintaining optical cable are guided based on the anti-vibration effects.

[0025] Preferably, the heavy object drop test scheme includes:

[0026] Fixing the optical cable trough box on a horizontal plane, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0027] Based on the IK protection grade test tool, 2J and 5J energy impacts are respectively applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0028] The test conditions include:

[0029] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0030] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0031] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0032] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0033] Preferably, the vibration table impact vibration test scheme includes:

[0034] Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0035] The output signal of the optical fiber current sensor is obtained by controlling the vibration table to apply impact vibration with an acceleration of 1g to 3g, a half-sine wave duration of 10ms, and a half-sine interval time of 2 seconds under different test conditions;

[0036] The test conditions include:

[0037] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0038] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0039] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0040] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0041] Preferably, the vibration table sweep frequency vibration test solution includes:

[0042] Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0043] Fix the optical cable trough box on a vertical vibration table and a horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table;

[0044] The output signal of the optical fiber current sensor is obtained by controlling the horizontal vibration table and the vertical vibration table to apply vibration of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibration of 150 Hz to 2000 Hz and an acceleration of 0.5 g.

[0045] The test conditions include:

[0046] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0047] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0048] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0049] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0050] Preferably, the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough box is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

[0051] According to another aspect of the present invention, the present invention provides a vibration test system for a fiber optic current transformer and a polarization-maintaining optical cable, the system comprising:

[0052] Establish a module, for laying a polarization-maintaining optical cable flat in an optical cable trough, connecting a first end of the polarization-maintaining optical cable to a fiber optic current sensor, and connecting a second end of the polarization-maintaining optical cable to a collection unit; adjusting parameters of the fiber optic current sensor to a working state, injecting current into the fiber optic current sensor, and transmitting an output signal of the fiber optic current sensor to the collection unit via the polarization-maintaining optical cable;

[0053] An execution module is used to perform a weight drop test on the polarization-maintaining optical cable based on a preset weight drop test scheme, and obtain the weight drop output signal of the optical fiber current sensor under different weight drop test schemes; perform a vibration table impact vibration test on the polarization-maintaining optical cable based on a preset vibration table impact vibration test scheme, and obtain the vibration table impact vibration output signal of the optical fiber current sensor under different vibration table impact vibration test schemes; perform a vibration table sweep frequency vibration test on the polarization-maintaining optical cable based on a preset vibration table sweep frequency vibration test scheme, and obtain the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes;

[0054] A result module is used to determine the anti-vibration effects of the heavy object falling test scheme, the vibration table impact vibration test scheme, and the vibration table sweep frequency vibration test scheme based on the heavy object falling output signal, the vibration table impact vibration output signal, and the vibration table sweep frequency vibration output signal, respectively, and to guide the anti-vibration measures of the polarization-maintaining optical cable based on the anti-vibration effects.

[0055] Preferably, the heavy object drop test scheme includes:

[0056] Fixing the optical cable trough box on a horizontal plane, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0057] Based on the IK protection grade test tool, 2J and 5J energy impacts are respectively applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0058] The test conditions include:

[0059] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0060] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0061] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0062] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0063] Preferably, the vibration table impact vibration test scheme includes:

[0064] Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0065] The output signal of the optical fiber current sensor is obtained by controlling the vibration table to apply impact vibration with an acceleration of 1g to 3g, a half-sine wave duration of 10ms, and a half-sine interval time of 2 seconds under different test conditions;

[0066] The test conditions include:

[0067] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0068] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0069] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0070] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0071] Preferably, the vibration table sweep frequency vibration test solution includes:

[0072] Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit;

[0073] Fix the optical cable trough box on a vertical vibration table and a horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table;

[0074] The output signal of the optical fiber current sensor is obtained by controlling the horizontal vibration table and the vertical vibration table to apply vibration of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibration of 150 Hz to 2000 Hz and an acceleration of 0.5 g.

[0075] The test conditions include:

[0076] The polarization-maintaining optical cable inside the optical cable trough box has no protective measures;

[0077] The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials;

[0078] The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials;

[0079] The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

[0080] Preferably, the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough box is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

[0081] The technical solution of the present invention provides a method and system for vibration testing of a polarization-maintaining optical cable of an optical fiber current transformer, wherein the method comprises: laying the polarization-maintaining optical cable flat in an optical cable trough box, connecting the first end of the polarization-maintaining optical cable to an optical fiber current sensor, and connecting the second end of the polarization-maintaining optical cable to an acquisition unit; adjusting the parameters of the optical fiber current sensor to a working state, injecting current into the optical fiber current sensor, and transmitting the output signal of the optical fiber current sensor to the acquisition unit via the polarization-maintaining optical cable; performing a heavy object drop test on the polarization-maintaining optical cable based on a preset heavy object drop test scheme, and obtaining the heavy object drop output signal of the optical fiber current sensor under different heavy object drop test schemes; and performing an impact vibration test scheme based on a preset vibration table. , perform a vibration test on the polarization-maintaining optical cable on a vibration table, and obtain the vibration table vibration output signal of the optical fiber current sensor under different vibration table vibration test schemes; based on the preset vibration table sweep frequency vibration test scheme, perform a vibration table sweep frequency vibration test on the polarization-maintaining optical cable, and obtain the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes; determine the anti-vibration effects of the heavy object falling test scheme, the vibration table shock vibration test scheme, and the vibration table sweep frequency vibration test scheme based on the weight falling output signal, the vibration table shock vibration output signal, and the vibration table sweep frequency vibration output signal, respectively, and guide the anti-vibration measures of the polarization-maintaining optical cable based on the anti-vibration effect. The technical solution of the present invention proposes a vibration test method and system for a polarization-maintaining optical cable of an optical fiber current transformer, which can carry out effective vibration tests on an optical fiber current transformer based on a LiNbO3 phase modulator, obtain the influence of vibration on the polarization-maintaining optical cable of the optical fiber current transformer, and guide the optical fiber current transformer to take effective anti-vibration measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0083] Figure 1 A schematic flow chart of a typical scheme for a fault optical fiber current transformer project according to the prior art;

[0084] Figure 2 A physical diagram of the optical fiber deployment of a fault optical fiber current transformer according to the prior art;

[0085] Figure 3 is a schematic diagram of an armored polarization-maintaining optical cable according to the prior art;

[0086] Figure 4 This is a flow chart of a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer according to a preferred embodiment of the present invention;

[0087] Figure 5 Schematic diagram of a vibration test scheme for a polarization-maintaining optical cable of an optical fiber current transformer according to a preferred embodiment of the present invention;

[0088] Figure 6 Schematic diagram of the principle of the vibration test on a vibration table according to a preferred embodiment of the present invention;

[0089] Figure 7 A physical picture of a sample according to a preferred embodiment of the present invention;

[0090] Figure 8 This is an energy impact test diagram according to a preferred embodiment of the present invention;

[0091] Figure 9 Figure 2 is a diagram of two cushioning materials used in a test according to a preferred embodiment of the present invention;

[0092] Figure 10 2. A frequency sweep vibration test diagram of a polarization-maintaining optical cable according to a preferred embodiment of the present invention;

[0093] Figure 11 A schematic diagram of a protective steel plate installation solution according to a preferred embodiment of the present invention; and

[0094] Figure 12 The structure diagram of a vibration test system for a fiber optic current transformer and polarization-maintaining cable according to a preferred embodiment of the present invention is shown. DETAILED DESCRIPTION

[0095] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0096] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0097] Figure 4 This is a flow chart of a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer according to a preferred embodiment of the present invention;

[0098] The present invention provides a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer, which can carry out an effective vibration test on a polarization-maintaining optical cable of an optical fiber current transformer based on a LiNbO3 phase modulator, and guide the optical fiber current transformer to take effective anti-vibration measures.

[0099] The optical fiber current transformer polarization-maintaining cable vibration test scheme provided by the present invention is as follows: Figure 5 To simulate a field application environment, a 60m armored polarization-maintaining optical cable was laid flat in a cable trough. The cable was then fused to the fiber optic sensor ring and acquisition unit. The fiber optic current transformer system parameters were adjusted to ensure normal transformer operation. Current was then injected into the fiber optic current transformer to ensure proper output. Different types of vibration were applied to the cable trough to test the output of the fiber optic current transformer. Different protective measures were applied to the cable trough to test the output of the fiber optic current transformer under these conditions.

[0100] The main test instruments and equipment include:

[0101] Table 1 Main test instruments and equipment

[0102]

[0103] like Figure 4 As shown, the present invention provides a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer, the method comprising:

[0104] Step 101: Lay a polarization-maintaining optical cable flat in a cable trough, connect a first end of the polarization-maintaining optical cable to a fiber optic current sensor, and connect a second end of the polarization-maintaining optical cable to a collection unit; adjust parameters of the fiber optic current sensor to a working state, inject current into the fiber optic current sensor, and transmit an output signal of the fiber optic current sensor to the collection unit via the polarization-maintaining optical cable;

[0105] Preferably, the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough box is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

[0106] Step 102: Based on a preset heavy object drop test scheme, perform a heavy object drop test on the polarization-maintaining optical cable to obtain heavy object drop output signals of the optical fiber current sensor under different heavy object drop test schemes;

[0107] Preferably, the heavy object drop test program includes:

[0108] Fix the optical cable trough box on a horizontal plane and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0109] Based on the IK protection grade test fixture, 2J and 5J energy impacts were applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor was obtained through the acquisition unit.

[0110] The test conditions include:

[0111] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0112] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0113] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0114] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0115] The present invention performs a simulated heavy object drop test:

[0116] Fix the optical cable trough box on the horizontal ground, lay the optical cable in the optical cable trough box, and weld the optical cable to the optical fiber current transformer sensing ring and the acquisition unit respectively, and output the signal to the fault recorder through the acquisition unit.

[0117] An IK protection grade test fixture is used to apply 2J and 5J energy shocks to the center point of the trough box to simulate the fall of a heavy object. The fault recorder records the output value of the optical fiber current transformer when the optical cable trough box is subjected to vibration.

[0118] The test conditions are divided into three categories:

[0119] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0120] b) The inside of the trough box is wrapped with different cushioning materials of different thicknesses to test the anti-vibration effect.

[0121] c) The outside of the trough box is wrapped with different cushioning materials of different thicknesses to test the anti-vibration effect.

[0122] Record the output values ​​of the fiber optic current transformer under different working conditions, and use the output values ​​to determine the anti-vibration effects of different buffer materials and how they are used.

[0123] Step 103: Based on a preset vibration test scheme, perform a vibration test on the polarization-maintaining optical cable, and obtain vibration output signals of the optical fiber current sensor under different vibration test schemes.

[0124] Preferably, the vibration table impact vibration test plan includes:

[0125] Fix the optical cable trough box on the vibration table and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0126] The vibration table is controlled to apply impact vibration with acceleration ranging from 1g to 3g, half-sine wave duration of 10ms, and half-sine interval of 2 seconds under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0127] The test conditions include:

[0128] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0129] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0130] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0131] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0132] The present invention performs a vibration table impact vibration test:

[0133] like Figure 6 As shown, the optical cable trough box is fixed on the vibration table, the optical cable is laid in the optical cable trough box, and the two ends of the optical cable are fused with the optical fiber current transformer sensing ring and the acquisition unit respectively, and the signal is output to the fault recorder through the acquisition unit.

[0134] (2) Vibration table impact vibration test

[0135] like Figure 7 As shown, the optical cable trough box is fixed on the vibration table, the optical cable is laid in the optical cable trough box, and the two ends of the optical cable are fused with the optical fiber current transformer sensing ring and the acquisition unit respectively, and the signal is output to the fault recorder through the acquisition unit.

[0136] The test conditions are divided into two categories:

[0137] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0138] b) Select the cushioning material and cushioning material usage method with the best protection effect in (1) and test the anti-vibration effect.

[0139] Record the maximum output value of the optical fiber current transformer under different working conditions, and judge the anti-vibration effect of the buffer material based on the output value.

[0140] Step 104: Based on a preset vibration table sweep frequency vibration test scheme, perform a vibration table sweep frequency vibration test on the polarization-maintaining optical cable, and obtain vibration table sweep frequency vibration output signals of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes;

[0141] Preferably, the vibration table sweep frequency vibration test solution includes:

[0142] Fix the optical cable trough box on the vibration table and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0143] Fix the optical cable trough box on the vertical vibration table and the horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table;

[0144] By controlling the horizontal vibration table and the vertical vibration table to apply vibrations of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibrations of 150 Hz to 2000 Hz and an acceleration of 0.5 g, the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0145] The test conditions include:

[0146] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0147] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0148] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0149] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0150] The present invention performs a vibration test on a vibration table with a swept frequency:

[0151] like Figure 6 As shown, the optical cable trough box is fixed on the vibration table, the optical cable is laid in the optical cable trough box, and the two ends of the optical cable are fused with two sets of optical fiber current transformer sensing rings and acquisition units respectively, and the signal is output to the fault recorder through the acquisition unit.

[0152] The present invention fixes a cable trough box on a vertical vibration table and a horizontal vibration table respectively. The horizontal vibration table is fixed perpendicularly (radially) to the force direction of the vibration table and parallel (axially) to the force direction of the vibration table respectively. By controlling the vibration table, sweep frequency vibrations of (1) 10 Hz to 150 Hz, acceleration 1 g; (2) 150 Hz to 2000 Hz, acceleration 0.5 g are applied respectively. A fault recorder records the output value of the optical fiber current transformer when the optical cable trough box is subjected to vibration.

[0153] The test conditions are divided into two categories:

[0154] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0155] b) Select the cushioning material and cushioning material usage method with the best protection effect in (1) and test the anti-vibration effect.

[0156] Record the output values ​​of the fiber optic current transformer under different working conditions and judge the anti-vibration effect of the buffer material based on the output values.

[0157] Step 105: Determine the anti-vibration effects of the heavy object drop test scheme, the vibration table impact vibration test scheme, and the vibration table sweep frequency vibration test scheme based on the heavy object drop output signal, the vibration table impact vibration output signal, and the vibration table sweep frequency vibration output signal, respectively, and guide the anti-vibration measures of the polarization-maintaining optical cable based on the anti-vibration effects.

[0158] The present invention proposes a vibration test method for a polarization-maintaining optical cable of a fiber-optic current transformer. The method can effectively conduct vibration tests on a fiber-optic current transformer based on a LiNbO3 phase modulator, determine the impact of vibration on the polarization-maintaining optical cable of the fiber-optic current transformer, and guide the fiber-optic current transformer to take effective anti-vibration measures.

[0159] The present invention proposes a vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer. First, a field application environment is simulated, and an armored polarization-maintaining optical cable is laid flat in an optical cable trough box. The optical cable is fused to the optical fiber sensor ring and the acquisition unit respectively. The optical fiber current transformer system parameters are adjusted to make the transformer state normal. Then, current is injected into the optical fiber current transformer to ensure normal output of the device. A simulated heavy object drop test is carried out on the optical cable trough box to test the output value of the optical fiber current transformer. The optical cable trough box is fixed on a vibration table, and an impact vibration test of the vibration table is carried out to test the output value of the optical fiber current transformer. Finally, a sweep frequency vibration test of the vibration table is carried out to test the output value of the optical fiber current transformer. The influence of different vibrations on the output of the optical fiber current transformer of the polarization-maintaining optical cable is obtained, and the anti-vibration effect of different buffer materials is judged at the same time, so as to guide the optical fiber current transformer to take effective anti-vibration measures.

[0160] The main technical parameters of the fiber optic current transformer selected in this invention are: rated primary current 1A, digital output mode, communication protocol IEC60044-8, sampling rate 10kHz, accuracy level 1, 2 primary current sensors, 1 acquisition unit, polarization-maintaining optical cable length of 60m, cable trench box specifications of 15cm wide, 10cm high, and 2m long, including the trench box cover. Figure 8 shown.

[0161] (1) Simulated heavy object drop test

[0162] 1) Experimental plan

[0163] Use IK protection grade test equipment to conduct 2J and 5J energy impact on the center point of the trough box to simulate the falling of heavy objects. The fault recorder records the output value of the optical fiber current transformer when the optical cable trough box is subjected to vibration. Figure 8 As shown, 2J and 5J are the standard energy values ​​of IK protection grade test equipment.

[0164] The test conditions are divided into three categories:

[0165] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0166] b) The inside of the tank box is wrapped as follows Figure 9 The buffer material 1 (environmentally friendly flame-retardant composite rubber sound insulation cotton) and buffer material 2 (flame-retardant sound insulation foam sponge) of different thicknesses are shown to test the anti-vibration effect.

[0167] c) The outside of the trough box is wrapped with cushioning material 1 (environmentally friendly flame-retardant composite rubber sound insulation cotton) and cushioning material 2 (flame-retardant sound insulation foam sponge) of different thicknesses to test the anti-vibration effect.

[0168] Record the output values ​​of the fiber optic current transformer under different working conditions, and use the output values ​​to determine the anti-vibration effects of different buffer materials and how they are used.

[0169] 2) Test results

[0170] Table 2 Error current under different impact energies and different protection modes

[0171]

[0172] 3) Experimental summary

[0173] a) Without protection, when 2J impulse energy is applied, the maximum error current of the fiber optic current transformer is -0.474A; when 5J impulse energy is applied, the maximum error current is -0.932A.

[0174] b) The maximum error current is significantly reduced after adopting various protective measures compared to when no protective measures are taken, indicating that both materials have a certain impact buffering effect. When an impact energy of 2J or 5J is applied, the maximum error current is less than 20% of the rated current when the corresponding protective measures are added.

[0175] (2) Vibration table impact vibration test

[0176] 1) Experimental plan

[0177] By controlling the vibration table to apply impact vibration with an acceleration of 1g-3g, a half-sine wave duration of 10ms, and a half-sine interval of 2 seconds, the fault recorder records the output value of the optical fiber current transformer when the optical cable trough box is subjected to vibration.

[0178] The test conditions are divided into two categories:

[0179] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0180] b) The inside of the trough box is wrapped with 20 mm thick buffer material 1 (environmentally friendly flame retardant composite rubber sound insulation cotton) to test the anti-vibration effect.

[0181] Record the maximum output value of the optical fiber current transformer under different working conditions, and judge the anti-vibration effect of the buffer material based on the output value.

[0182] 2) Test results

[0183] Table 3 Error current under different protection modes and different impact accelerations

[0184]

[0185] 3) Experimental summary

[0186] a) As the impact acceleration increases, the error current of the fiber optic current transformer also increases. When the fiber optic cable trough box is unprotected and the impact acceleration is around 3g, the maximum error current will be greater than 20% of the rated current.

[0187] b) After wrapping the inside of the trough box with 20 mm of buffer material 1, the error current of the fiber-optic current transformer was reduced. This protection method has a certain buffering effect on shock vibrations of different accelerations. When the shock acceleration is 3g, the maximum error current is less than 20% of the rated current.

[0188] (3) Vibration table sweep frequency vibration test

[0189] 1) Experimental plan

[0190] like Figure 10 As shown, the optical cable trough box is fixed on the vibration table, the optical cable is laid in the optical cable trough box, and the two ends of the optical cable are fused with two sets of optical fiber current transformer sensing rings and acquisition units respectively, and the signal is output to the fault recorder through the acquisition unit.

[0191] The cable trough box is fixed on a vertical vibration table and a horizontal vibration table respectively. The horizontal vibration table is fixed perpendicularly (radially) to the force direction of the vibration table and parallel to the force direction of the vibration table (axially). By controlling the vibration table, sweep frequency vibrations of (1) 10 Hz to 150 Hz, acceleration 1 g; (2) 150 Hz to 2000 Hz, acceleration 0.5 g are applied respectively. The fault recorder records the output value of the optical fiber current transformer when the optical cable trough box is subjected to vibration.

[0192] The test conditions are divided into two categories:

[0193] a) There are no protective measures for the optical cables in the cable trough box, which is consistent with the project site.

[0194] b) The inside of the trough box is wrapped with 20 mm thick buffer material 1 (environmentally friendly flame retardant composite rubber sound insulation cotton) to test the anti-vibration effect.

[0195] Record the output values ​​of the fiber optic current transformer under different working conditions and judge the anti-vibration effect of the buffer material based on the output values.

[0196] 2) Test results

[0197] Table 4 Error current under different protection modes and different vibration conditions

[0198]

[0199] 3) Experimental summary

[0200] a) When the trough box is subjected to vertical and horizontal axial swept frequency vibration without protection, the error current is greater than 20% of the rated current when the swept frequency vibration of 10Hz-150Hz, acceleration 1g and 150Hz-2000Hz, acceleration 0.5g is applied.

[0201] b) After the inside of the slot box is wrapped with 20 mm of buffer material 1, the maximum error current decreases, indicating that this protection method has a certain buffering effect on the sweep frequency vibration.

[0202] c) When the trough box is subjected to vertical and horizontal axial swept frequency vibrations and the interior of the trough box is wrapped with 20 mm of buffer material 1, and swept frequency vibrations of 10 Hz to 150 Hz, acceleration 1 g and 150 Hz to 2000 Hz, acceleration 0.5 g are applied, the error current is less than 20% of the rated current.

[0203] Based on the above test results, the following maintenance work should be carried out for the fiber optic current transformers in operation on site to prevent abnormal output of the fiber optic current transformers caused by vibration:

[0204] (1) Inspection of hazardous sources and hidden dangers within the station

[0205] On-site inspection and rectification of impact vibration hazards were carried out, especially in the cable trenches where polarization-maintaining optical cables were laid. A comprehensive inspection was conducted to determine whether the optical cables in the trenches were laid in accordance with regulations, whether the polarization-maintaining optical fiber troughs were securely fixed, and whether there were any heavy objects falling from fixed points around the troughs. Vibration hazards of polarization-maintaining optical fibers in converter station cable trenches include:

[0206] 1) The cable trench cover breaks or slides off, or the bridge support rod breaks or slides off and collides with the cable trough box;

[0207] 2) During the construction of a new project, construction workers accidentally stepped on the optical cable trough box while laying cables;

[0208] 3) During the construction of a new project, using an electric drill to drill holes may cause the cable trough box to vibrate;

[0209] 4) During large-scale operations, the movement of cranes and other equipment causes the optical cable trough box to vibrate;

[0210] 5) During renovation and expansion operations, the road roller compacts the road surface, causing the cable trough box to vibrate;

[0211] 6) Small animals such as cats and mice mistakenly enter the cable trench and damage the fire partition fixing device, causing the fire partition to fall off and accidentally hit the polarization-maintaining optical fiber;

[0212] 7) Continuous heavy rain weather, floating objects in the water collide with the cable trough box;

[0213] 8) Earthquake.

[0214] (2) Enhanced protection of optical fiber trough box

[0215] Measure 1: A layer of fireproof and soundproof cotton is laid on the bottom and inner walls of both sides of the polarization-maintaining cable trough box in the converter station.

[0216] Measure 2: Install protective steel plates to prevent the fireproof panels or other heavy objects from falling. The installation plan for protective steel plates is as follows: Figure 11 shown.

[0217] Figure 12 The structure diagram of a vibration test system for a fiber optic current transformer and polarization-maintaining cable according to a preferred embodiment of the present invention is shown.

[0218] like Figure 12 As shown, the present invention provides a vibration test system for a fiber optic current transformer and a polarization-maintaining optical cable, the system comprising:

[0219] Establishing module 201, for laying a polarization-maintaining optical cable in a cable trough, connecting a first end of the polarization-maintaining optical cable to a fiber optic current sensor, and connecting a second end of the polarization-maintaining optical cable to a collection unit; adjusting parameters of the fiber optic current sensor to a working state, injecting current into the fiber optic current sensor, and transmitting an output signal of the fiber optic current sensor to the collection unit via the polarization-maintaining optical cable;

[0220] Preferably, the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough box is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

[0221] The execution module 202 is configured to perform a weight drop test on the polarization-maintaining optical cable based on a preset weight drop test scheme, and obtain the weight drop output signal of the optical fiber current sensor under different weight drop test schemes; perform a vibration table impact vibration test on the polarization-maintaining optical cable based on a preset vibration table impact vibration test scheme, and obtain the vibration table impact vibration output signal of the optical fiber current sensor under different vibration table impact vibration test schemes; perform a vibration table sweep frequency vibration test on the polarization-maintaining optical cable based on a preset vibration table sweep frequency vibration test scheme, and obtain the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes;

[0222] Preferably, the heavy object drop test program includes:

[0223] Fix the optical cable trough box on a horizontal plane and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0224] Based on the IK protection grade test fixture, 2J and 5J energy impacts were applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor was obtained through the acquisition unit.

[0225] The test conditions include:

[0226] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0227] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0228] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0229] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0230] Preferably, the vibration table impact vibration test plan includes:

[0231] Fix the optical cable trough box on the vibration table and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0232] The vibration table is controlled to apply impact vibration with acceleration ranging from 1g to 3g, half-sine wave duration of 10ms, and half-sine interval of 2 seconds under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0233] The test conditions include:

[0234] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0235] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0236] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0237] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0238] Preferably, the vibration table sweep frequency vibration test solution includes:

[0239] Fix the optical cable trough box on the vibration table and fuse the polarization-maintaining optical cable with the optical fiber current sensor and acquisition unit;

[0240] Fix the optical cable trough box on the vertical vibration table and the horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table;

[0241] By controlling the horizontal vibration table and the vertical vibration table to apply vibrations of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibrations of 150 Hz to 2000 Hz and an acceleration of 0.5 g, the output signal of the optical fiber current sensor is obtained through the acquisition unit;

[0242] The test conditions include:

[0243] There is no protection for the polarization-maintaining optical cables inside the cable trough;

[0244] The polarization-maintaining optical cables inside the cable trough are wrapped with different thicknesses and different buffer materials;

[0245] The outside of the optical cable trough box is wrapped with different thicknesses and different buffer materials;

[0246] The anti-vibration effects of different buffer materials and buffer material usage methods are determined by the output signal of the fiber optic current sensor.

[0247] The result module 203 is used to determine the anti-vibration effects of the heavy object drop test scheme, the vibration table impact vibration test scheme, and the vibration table sweep frequency vibration test scheme based on the heavy object drop output signal, the vibration table impact vibration output signal, and the vibration table sweep frequency vibration output signal, respectively, and guide the anti-vibration measures of the polarization-maintaining optical cable based on the anti-vibration effects.

[0248] A fiber optic current transformer polarization-maintaining cable vibration test system according to a preferred embodiment of the present invention corresponds to a fiber optic current transformer polarization-maintaining cable vibration test method according to another preferred embodiment of the present invention, and will not be described in detail here.

[0249] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0250] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0251] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0252] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0253] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0254] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

[0255] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0256] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / the [means, component, etc.]" are to be interpreted openly as referring to at least one instance of the means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily need to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A vibration test method for a polarization-maintaining optical cable of an optical fiber current transformer, the method comprising: Laying the polarization-maintaining optical cable flat in the optical cable trough, connecting the first end of the polarization-maintaining optical cable to the optical fiber current sensor, and connecting the second end of the polarization-maintaining optical cable to the acquisition unit; Adjusting the parameters of the fiber optic current sensor to a working state, injecting current into the fiber optic current sensor, and transmitting the output signal of the fiber optic current sensor to the acquisition unit via the polarization-maintaining optical cable; Based on a preset heavy object drop test scheme, performing a heavy object drop test on the polarization-maintaining optical cable to obtain a heavy object drop output signal of the optical fiber current sensor under different heavy object drop test schemes; Based on a preset vibration table shock vibration test scheme, performing a vibration table shock vibration test on the polarization-maintaining optical cable, and obtaining vibration table shock vibration output signals of the optical fiber current sensor under different vibration table shock vibration test schemes; Based on a preset vibration table sweep frequency vibration test scheme, performing a vibration table sweep frequency vibration test on the polarization-maintaining optical cable, and obtaining the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes; The anti-vibration effects of the heavy object falling test scheme, the vibration table impact vibration test scheme and the vibration table sweep frequency vibration test scheme are determined based on the heavy object falling output signal, the vibration table impact vibration output signal and the vibration table sweep frequency vibration output signal respectively, and the anti-vibration measures of the polarization-maintaining optical cable are guided based on the anti-vibration effects.

2. The method according to claim 1, wherein the heavy object drop test scheme comprises: Fixing the optical cable trough box on a horizontal plane, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; Based on the IK protection grade test tool, 2J and 5J energy impacts are respectively applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit; The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

3. The method according to claim 1, wherein the vibration table impact vibration test scheme comprises: Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; The output signal of the optical fiber current sensor is obtained by controlling the vibration table to apply impact vibration with an acceleration of 1g to 3g, a half-sine wave duration of 10ms, and a half-sine interval time of 2 seconds under different test conditions; The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

4. The method according to claim 1, wherein the vibration table sweep frequency vibration test scheme comprises: Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; Fix the optical cable trough box on a vertical vibration table and a horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table; The output signal of the optical fiber current sensor is obtained by controlling the horizontal vibration table and the vertical vibration table to apply vibration of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibration of 150 Hz to 2000 Hz and an acceleration of 0.5 g. The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

5. The method according to claim 1, wherein the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

6. A fiber optic current transformer polarization-maintaining cable vibration test system, the system comprising: Establish a module for laying a polarization-maintaining optical cable flat in an optical cable trough, wherein a first end of the polarization-maintaining optical cable is connected to a fiber optic current sensor, and a second end of the polarization-maintaining optical cable is connected to a collection unit; Adjusting the parameters of the fiber optic current sensor to a working state, injecting current into the fiber optic current sensor, and transmitting the output signal of the fiber optic current sensor to the acquisition unit via the polarization-maintaining optical cable; an execution module, configured to perform a heavy object drop test on the polarization-maintaining optical cable based on a preset heavy object drop test scheme, and obtain a heavy object drop output signal of the optical fiber current sensor under different heavy object drop test schemes; Based on a preset vibration table shock vibration test scheme, performing a vibration table shock vibration test on the polarization-maintaining optical cable, and obtaining vibration table shock vibration output signals of the optical fiber current sensor under different vibration table shock vibration test schemes; Based on a preset vibration table sweep frequency vibration test scheme, performing a vibration table sweep frequency vibration test on the polarization-maintaining optical cable, and obtaining the vibration table sweep frequency vibration output signal of the optical fiber current sensor under different vibration table sweep frequency vibration test schemes; A result module is used to determine the anti-vibration effects of the heavy object falling test scheme, the vibration table impact vibration test scheme, and the vibration table sweep frequency vibration test scheme based on the heavy object falling output signal, the vibration table impact vibration output signal, and the vibration table sweep frequency vibration output signal, respectively, and to guide the anti-vibration measures of the polarization-maintaining optical cable based on the anti-vibration effects.

7. The system according to claim 6, wherein the heavy object drop test scheme comprises: Fixing the optical cable trough box on a horizontal plane, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; Based on the IK protection grade test tool, 2J and 5J energy impacts are respectively applied to the center point of the trough box under different test conditions, and the output signal of the optical fiber current sensor is obtained through the acquisition unit; The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

8. The system according to claim 6, wherein the vibration table shock vibration test solution comprises: Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; The output signal of the optical fiber current sensor is obtained by controlling the vibration table to apply impact vibration with an acceleration of 1g to 3g, a half-sine wave duration of 10ms, and a half-sine interval time of 2 seconds under different test conditions; The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

9. The system according to claim 6, wherein the vibration table sweep frequency vibration test solution comprises: Fixing the optical cable trough box on a vibration table, and fusing the polarization-maintaining optical cable, the optical fiber current sensor, and the acquisition unit; Fix the optical cable trough box on a vertical vibration table and a horizontal vibration table respectively, and fix it on the horizontal vibration table in a direction perpendicular to and parallel to the force applied by the vibration table; The output signal of the optical fiber current sensor is obtained by controlling the horizontal vibration table and the vertical vibration table to apply vibration of 10 Hz to 150 Hz and an acceleration of 1 g under different test conditions; or applying swept frequency vibration of 150 Hz to 2000 Hz and an acceleration of 0.5 g. The test conditions include: The polarization-maintaining optical cable inside the optical cable trough box has no protective measures; The polarization-maintaining optical cables inside the optical cable trough are respectively wrapped with different thicknesses and different buffer materials; The exterior of the optical cable trough box is respectively wrapped with different thicknesses and different buffer materials; The anti-vibration effects of different buffer materials and buffer material usage methods are judged by the output signal of the optical fiber current sensor.

10. The system according to claim 6, wherein the length of the polarization-maintaining optical cable is 50m to 70m; the width of the optical cable trough is 13cm-17cm, the height is 8cm to 12cm, and the length is 1.5m to 2.5m.

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