An all-fiber current transformer and a debugging method thereof

Abstract

This invention relates to an all-fiber current transformer and its debugging method. The method involves configuring an initial drive current, an initial modulation period, and an initial half-wave voltage. When the comb-wave voltage is greater than a first comb-wave voltage threshold, the initial drive current is increased until the comb-wave voltage is less than the first comb-wave voltage threshold, thus obtaining a first drive current. The initial drive current is replaced with the first drive current. When the modulation period is less than the first modulation period, the modulation period is increased to obtain an optimal modulation period. The initial modulation period is replaced with the optimal modulation period, and the device is periodically reset. When the step value corresponding to the initial half-wave voltage is not zero, the half-wave voltage is increased until the step value corresponding to the half-wave voltage is zero, thus obtaining an optimal half-wave voltage. Based on the optimal half-wave voltage, the optimal drive current is obtained. This achieves intelligent autonomous debugging among the drive current, modulation period, and half-wave voltage, enabling rapid and accurate calculation of the operating parameters of the all-fiber current transformer.

Description

Technical Field

[0001] This invention relates to an all-fiber current transformer and its commissioning method, belonging to the field of power system automation. Background Technology

[0002] With the development of national smart grids and ultra-high voltage power grids, traditional electromagnetic current transformers have gradually revealed their fatal flaws, such as extreme difficulty in insulation at high voltage levels and susceptibility to magnetic saturation at even higher voltages, leading to a decrease in measurement accuracy. In contrast, all-fiber optic current transformers based on optical sensing technology use a full-fiber optical path to achieve closed-loop detection of current signals. They offer advantages such as a large dynamic range, wide measurement bandwidth, good anti-electromagnetic interference performance, small size, light weight, easy integration with high-voltage equipment, and the ability to measure DC signals, making them an important direction for the development of transformer technology. In recent years, with the rapid development of conventional and flexible DC transmission projects, the market prospects for all-fiber optic current transformers are broad.

[0003] Meanwhile, compared with traditional electromagnetic current transformers, all-fiber current transformers adopt new technologies such as SLD light sources, PINFET components, and lithium niobate optical waveguide phase modulators. However, when debugging the various parameters of all-fiber current transformers, there are many complex parameters and high debugging difficulty. Furthermore, no debugging connection or logic has been established between optical power parameters, modulation period parameters, and half-wave voltage parameters. As a result, if any one parameter is not properly configured during debugging, it will cause the other two parameters to malfunction. Debuggers cannot independently and quickly identify the debugging logic. The resulting debugging errors, misoperations, and subjective judgments will cause differences and operational risks in batch applications, resulting in hidden dangers after product debugging. Moreover, large-scale debugging requires a large investment of manpower and equipment costs, which is a problem that restricts the large-scale engineering application of the product. Summary of the Invention

[0004] The purpose of this invention is to provide an all-fiber current transformer and its debugging method to solve the problems of insufficient debugging connection and debugging logic among optical power parameters, modulation period parameters, and half-wave voltage parameters, and to achieve targeted, intelligent and efficient debugging.

[0005] To achieve the above objectives, on the one hand, this invention proposes a commissioning method for an all-fiber current transformer, comprising:

[0006] Configure the initial drive current, initial modulation period, and initial half-wave voltage;

[0007] When the comb voltage is greater than the first comb voltage threshold, the initial drive current is increased until the comb voltage is less than the first comb voltage threshold, thus obtaining the first drive current.

[0008] Replace the initial drive current with the first drive current. When the modulation period is less than the first modulation period, increase the modulation period and determine the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period. Select the narrowest comb wave from all comb wave peak widths and determine the modulation period corresponding to the comb wave as the optimal modulation period.

[0009] Replace the initial modulation period with the optimal modulation period to trigger the reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, increase the half-wave voltage until the step value corresponding to the half-wave voltage is zero to obtain the optimal half-wave voltage.

[0010] Based on the optimal half-wave voltage, the driving current is increased on the basis of the first driving current until the comb wave voltage reaches the first comb wave voltage threshold, thus obtaining the optimal driving current.

[0011] Furthermore, the commissioning method for the aforementioned all-fiber current transformer configures the initial drive current, initial modulation period, and initial half-wave voltage through the following steps:

[0012] The lower limits for the drive current, modulation period, and half-wave voltage of the all-fiber current transformer to be debugged are preset.

[0013] The lower limit of the drive current is set as the initial drive current;

[0014] The lower limit of the modulation period is determined as the initial modulation period;

[0015] The lower limit of the half-wave voltage adjustment is set as the initial half-wave voltage.

[0016] Furthermore, the above-mentioned commissioning method for the all-fiber current transformer involves increasing the initial drive current, increasing the modulation period, and increasing the half-wave voltage through the following steps:

[0017] Based on the hardware precision of the optical module's drive current, the drive current increment is preset so that the initial drive current increases according to the drive current increment.

[0018] Based on the hardware precision of the PCB board, the modulation period increment and half-wave voltage increment are preset so that the initial modulation period increases according to the modulation period increment and the initial half-wave voltage increases according to the half-wave voltage increment.

[0019] Furthermore, the commissioning method for the aforementioned all-fiber current transformer also includes:

[0020] The upper limit for increasing the preset drive current, the upper limit for increasing the modulation period, and the upper limit for increasing the half-wave voltage are set.

[0021] Based on the upper limit of the increase in the drive current, the upper limit of the increase in the modulation period, and the upper limit of the increase in the half-wave voltage, the optimal drive current, the optimal modulation period, and the optimal half-wave voltage are modulated.

[0022] On the other hand, the present invention also proposes an all-fiber current transformer, including a controller that executes instructions to implement the following method steps:

[0023] Configure the initial drive current, initial modulation period, and initial half-wave voltage;

[0024] When the comb voltage is greater than the first comb voltage threshold, the initial drive current is increased until the comb voltage is less than the first comb voltage threshold, thus obtaining the first drive current.

[0025] Replace the initial drive current with the first drive current. When the modulation period is less than the first modulation period, increase the modulation period and determine the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period. Select the narrowest comb wave from all comb wave peak widths and determine the modulation period corresponding to the comb wave as the optimal modulation period.

[0026] Replace the initial modulation period with the optimal modulation period to trigger the reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, increase the half-wave voltage until the step value corresponding to the half-wave voltage is zero to obtain the optimal half-wave voltage.

[0027] Based on the optimal half-wave voltage, the driving current is increased on the basis of the first driving current until the comb wave voltage reaches the first comb wave voltage threshold, thus obtaining the optimal driving current.

[0028] Furthermore, the aforementioned all-fiber current transformer is configured with its initial drive current, initial modulation period, and initial half-wave voltage through the following steps:

[0029] The lower limits for the drive current, modulation period, and half-wave voltage of the all-fiber current transformer to be debugged are preset.

[0030] The lower limit of the drive current is set as the initial drive current;

[0031] The lower limit of the modulation period is determined as the initial modulation period;

[0032] The lower limit of the half-wave voltage adjustment is set as the initial half-wave voltage.

[0033] Furthermore, the aforementioned all-fiber current transformer increases the initial drive current, increases the modulation period, and increases the half-wave voltage through the following steps:

[0034] Based on the hardware precision of the optical module's drive current, the drive current increment is preset so that the initial drive current increases according to the drive current increment.

[0035] Based on the hardware precision of the PCB board, the modulation period increment and half-wave voltage increment are preset so that the initial modulation period increases according to the modulation period increment and the initial half-wave voltage increases according to the half-wave voltage increment.

[0036] Furthermore, the aforementioned all-fiber current transformer also includes:

[0037] The upper limit for increasing the preset drive current, the upper limit for increasing the modulation period, and the upper limit for increasing the half-wave voltage are set.

[0038] Based on the upper limit of the increase in the drive current, the upper limit of the increase in the modulation period, and the upper limit of the increase in the half-wave voltage, the optimal drive current, the optimal modulation period, and the optimal half-wave voltage are modulated.

[0039] The beneficial effects of this invention are as follows: An initial drive current, an initial modulation period, and an initial half-wave voltage are configured; when the comb wave voltage is greater than a first comb wave voltage threshold, the initial drive current is increased until the comb wave voltage is less than the first comb wave voltage threshold, thus obtaining a first drive current; the initial drive current is replaced with the first drive current; when the modulation period is less than the first modulation period, the modulation period is increased and the peak width corresponding to each modulation period is determined until the modulation period is greater than the first modulation period; the narrowest comb wave is selected from all comb wave peak widths, and the modulation period corresponding to this comb wave is determined as the optimal modulation period. The initial modulation period is replaced with the optimal modulation period, triggering the reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, the half-wave voltage is increased until the step value corresponding to the half-wave voltage is zero, thus obtaining the optimal half-wave voltage. Based on the optimal half-wave voltage, the driving current is increased on the basis of the first driving current until the comb voltage reaches the first comb voltage threshold, thus obtaining the optimal driving current. This realizes intelligent autonomous debugging between driving current, modulation period, and half-wave voltage, quickly and accurately calculating the operating parameters of the all-fiber current transformer, and significantly reducing the equipment installation, debugging, and operation costs. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating a debugging method for an all-fiber current transformer according to one aspect of the present invention.

[0041] Figure 2 This is a flowchart illustrating the commissioning method of an all-fiber current transformer according to one aspect of the present invention in a practical application scenario. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] The concept of this invention is to achieve mutual adjustment between the optimal drive current, optimal modulation period, and optimal half-wave voltage by configuring the initial drive current, initial modulation period, and initial half-wave voltage, combined with the comb wave voltage, peak width, and step value. This enables the rapid and accurate calculation of the operating parameters of the all-fiber current transformer, improving the accuracy of equipment debugging and shortening the debugging cycle.

[0044] Method Example 1:

[0045] like Figure 1 The diagram shown is a flowchart illustrating a commissioning method for an all-fiber optic current transformer according to one aspect of the present invention. The method includes steps S11-S15, specifically:

[0046] Step S11: Configure the initial drive current, initial modulation period, and initial half-wave voltage. Specifically, in actual application scenarios, the lower limit of the drive current is set with reference to the hardware accuracy of the optical module's drive current; the lower limit of the modulation period and the lower limit of the half-wave voltage are set with reference to the hardware PCB (Printed Circuit Board) DA (Digital-to-Analog Converter) chip, and the lower limit of the drive current is determined as the initial drive current; the lower limit of the modulation period is determined as the initial modulation period; and the lower limit of the half-wave voltage is determined as the initial half-wave voltage.

[0047] After the parameter configuration takes effect, step S12 is executed. When the comb voltage is greater than the first comb voltage threshold, the initial drive current is increased until the comb voltage is less than the first comb voltage threshold, thus obtaining the first drive current. Here, the first comb voltage threshold refers to the voltage threshold that makes the accuracy of the drive current in the all-fiber current transformer optimal, so as to ensure that the modulated first drive current reaches the accuracy of the drive current in the all-fiber current transformer. At the same time, according to the hardware accuracy of the drive current of the optical module, the drive current increment and the upper limit of the increase are preset so that the initial drive current increases according to the drive current increment, and the optimal drive current / first drive current modulation is performed within the upper limit of the drive current increase, so as to ensure that the parameter values ​​are optimal and the hardware state is also optimal during the parameter debugging process.

[0048] Step S13: Replace the initial drive current with the first drive current. When the modulation period is less than the first modulation period, increase the modulation period and determine the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period. Select the narrowest comb wave from all comb wave peak widths and determine the modulation period corresponding to the comb wave as the optimal modulation period. Here, the first modulation period refers to the period threshold that makes the drive current accuracy in the all-fiber current transformer reach the optimal level. The peak width refers to the peak width of the comb wave corresponding to the modulation period. At the same time, based on the hardware accuracy of the PCB board, preset the modulation period increment and the upper limit of the increase so that the initial modulation period increases according to the modulation period increment, and the optimal modulation period is modulated within the upper limit of the modulation period increase, thereby realizing the adjustment of the comb wave peak width in the all-fiber current transformer.

[0049] Step S14: Replace the initial modulation period with the optimal modulation period, triggering a reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, increase the half-wave voltage until the step value corresponding to the half-wave voltage is zero, thus obtaining the optimal half-wave voltage. Here, the step value refers to the step difference between the flat regions of different comb waves. A step value of zero ensures that there is no current output or generation during the debugging process. At the same time, based on the hardware precision of the PCB board, a preset half-wave voltage increment and an upper limit for the increase are set so that the initial half-wave voltage increases according to the half-wave voltage increment, and the optimal half-wave voltage is modulated within the upper limit of the half-wave voltage increase. In the preferred embodiment of this application, the all-fiber current transformer preferably performs a 2π reset to avoid debugging failures caused by exceeding the hardware load during the debugging process.

[0050] Since the half-wave voltage is modulated to the optimal half-wave voltage, the comb wave voltage increases accordingly. In order to make the drive current optimal, step S15 is executed. Based on the optimal half-wave voltage, the drive current is increased on the basis of the first drive current until the comb wave voltage reaches the first comb wave voltage threshold, thus obtaining the optimal drive current.

[0051] Through the above steps S11-S15, the debugging logic between the driving current, modulation period and half-wave voltage is constructed, realizing the debugging process of the three parameters working together. This is more conducive to the efficient and intelligent execution of the all-fiber current transformer. Moreover, the debugging method is simple and highly practical, providing reliable support for large-scale promotion and application.

[0052] In a preferred embodiment of this application, the lower limit I of the drive current is preferably set with reference to the hardware precision of the drive current of the optical module. min The lower limit of the drive current adjustment I min The initial drive current I0 is determined; the lower limit T of the modulation period is set with reference to the accuracy of the DA chip on the PCB board. minAnd the lower limit V of the half-wave voltage adjustment min The lower limit T of the modulation period is adjusted. min The initial modulation period T0 is determined, and the lower limit of the half-wave voltage V is adjusted. min The initial half-wave voltage V0 is determined. After the configuration takes effect, the comb wave generated by the current optical module is sampled to obtain the current comb wave voltage V. comb_wave The preferred first comb wave voltage threshold is -100mV, the drive current increment is δI, and the upper limit of the increase is I. max When V comb_wave When the voltage is >-100mV, δI is continuously increased from I0, but it cannot exceed I. max And after each increase, it is determined whether the comb voltage is greater than -100mV; when V appears comb_wave When the voltage is ≤-100mV, the current I at this time is... x It is determined to be the first driving current I1.

[0053] Based on the hardware precision of the PCB board, the preferred first modulation period is 5μs, the modulation period increment is δT, and the upper limit of the increment is T. max Configure I1, T0, and V0 for the all-fiber current transformer; after the configuration takes effect, record the peak width of the comb wave generated by the current optical module; when T0 ≤ 5μs, continuously increase δT based on T0, but do not exceed T. max And record the peak width corresponding to each modulation cycle after each increase; when T appears x When the value is greater than 5μs, the modulation period T is adjusted accordingly. x The optimal modulation period T is determined. 优 .

[0054] Based on the hardware precision of the PCB board, the preferred half-wave voltage increment is δV and the upper limit of the increment is V. max Configure I1 and T for all-fiber current transformers 优 After the configuration takes effect, it is preferred to trigger a 2π reset of the all-fiber current transformer every 1ms; obtain the step value V corresponding to V0. step0 When V step0 When V≠0, add δV to V0, but not exceeding V. max When V appears x Step value V stepx When =0, the half-wave voltage V at this time x Determined as the optimal half-wave voltage V 优 .

[0055] According to V 优 Based on I1, δI is continuously increased, but cannot exceed I. max And after each increase, it is determined whether the comb voltage is greater than -100mV; when V appearscomb_wave When the voltage is ≤-100mV, the current at this point is determined as the optimal drive current I. 优 .

[0056] Method Example 2:

[0057] like Figure 2 The diagram shows a flowchart of a debugging method for an all-fiber current transformer according to one aspect of the present invention in a practical application scenario. First, the modulation parameters are initialized, setting the drive current Idrive to 10mA, the modulation period Tmod to 2μs, and the half-wave voltage Vhalf_wave to 1V. After the parameter configuration takes effect, the comb wave generated by the current optical module is sampled, and it is determined whether the comb wave voltage Vcomb_wave is less than -100mV. If Vcomb_wave ≥ -100mV, the current drive current is not the optimal parameter, and Idrive is increased by ΔI (where ΔI is the drive current increment set according to the hardware precision of the optical module's drive current, preferably ΔI = 1mA). Idrive is continuously increased by 1mA until Vcomb_wave < -100mV, and the drive current Idrive1 is recorded at this point, completing the first parameter debugging of the drive current.

[0058] Next, based on the modulation of the first drive current, the parameter Idrive is configured as Idrive1. After the parameter configuration takes effect, the peak width of the comb wave is recorded. Since the current modulation period Tmod remains unchanged, the peak width of the comb wave corresponding to a 2μs modulation period is recorded. Then, it is determined whether Tmod is greater than 5μs. If Tmod ≤ 5μs, Tmod is increased by ΔT (where ΔT is the modulation period increment set according to the accuracy of the DA chip on the hardware PCB board, preferably ΔT = 20ns). The increment is continuously increased by 20ns from 2μs until Tmod > 5μs. The peak widths of all recorded comb waves are observed, and the modulation period corresponding to the narrowest peak width of the comb wave is selected as the optimal modulation period Tmod_optimal, thus completing the parameter adjustment of the modulation period.

[0059] Secondly, based on the optimal modulation period, the parameter Tmod is configured as Tmod_optimal. After the parameter configuration takes effect, a 2π reset is triggered every 1ms to obtain the step value Vstep corresponding to the half-wave voltage. If Vstep≠0, Vhalf_wave is increased by ΔV (where ΔV is the half-wave voltage increment set according to the accuracy of the DA chip on the hardware PCB board, preferably ΔV=0.5mV). Based on Vhalf_wave=1V, it is continuously increased by 0.5mV, and the step value corresponding to the half-wave voltage is continuously judged until Vstep=0. The half-wave voltage at this time is recorded as the optimal half-wave voltage Vhalf_wave_optimal, thus completing the parameter debugging of the half-wave voltage.

[0060] Continuing, as the half-wave voltage increases, the comb wave voltage Vcomb_wave also increases. Therefore, repeat the parameter adjustment steps for the drive current, continuously increasing it by 1mA based on Idrive1 until Vcomb_wave < -100mV. Record the drive current at this point as the optimal drive current Idrive_optimal, thus completing the parameter adjustment of the drive current.

[0061] Finally, the optimal drive current Idrive_optimal, the optimal modulation period Tmod_optimal, and the optimal half-wave voltage Vhalf_wave_optimal are stored so that subsequent runs do not require parameter modulation again.

[0062] In summary, by setting the threshold values ​​for debugging parameters, the optimal parameters can be obtained. In practical application scenarios, a debugging method program with automatic sampling, automatic calculation, and automatic filtering can be developed to quickly and accurately calculate the optimal operating parameters of the all-fiber current transformer, significantly reducing the costs of equipment installation, debugging, and operation, and providing reliable support for large-scale promotion and application.

[0063] Meanwhile, debugging logic for optical power debugging, modulation period debugging, and half-wave voltage debugging was established to solve the problems of mutual influence, mutual constraint, and repeated correction of various key debugging parameters, thereby improving the accuracy of debugging of all-fiber current transformers, shortening the debugging cycle, effectively improving the debugging efficiency of all-fiber current transformers, lowering the operation threshold for debugging personnel, reducing the manual input of batch debugging, and significantly reducing the equipment installation, debugging, and operation costs.

[0064] In another aspect of this application, an all-fiber optic current transformer is also provided, including a controller. The controller is used to implement the steps of the above-described debugging method for the all-fiber optic current transformer. In practical applications, the all-fiber optic current transformer receives debugging commands issued by a debugging terminal and can autonomously complete the debugging of the optimal drive current, optimal modulation period, and optimal half-wave voltage. Furthermore, the description of the above method in the embodiments is sufficiently clear and will not be repeated here.

Claims

1. A method for commissioning an all-fiber optic current transformer, characterized in that, include: Configure the initial drive current, initial modulation period, and initial half-wave voltage; When the comb voltage is greater than the first comb voltage threshold, the initial drive current is increased until the comb voltage is less than the first comb voltage threshold, thus obtaining the first drive current. Replace the initial drive current with the first drive current. When the modulation period is less than the first modulation period, increase the modulation period and determine the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period. Select the narrowest comb wave from all comb wave peak widths and determine the modulation period corresponding to the comb wave as the optimal modulation period. Replace the initial modulation period with the optimal modulation period to trigger the reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, increase the half-wave voltage until the step value corresponding to the half-wave voltage is zero to obtain the optimal half-wave voltage. Based on the optimal half-wave voltage, the driving current is increased on the basis of the first driving current until the comb wave voltage reaches the first comb wave voltage threshold, thus obtaining the optimal driving current.

2. The commissioning method for the all-fiber current transformer according to claim 1, characterized in that, Configure the initial drive current, initial modulation period, and initial half-wave voltage using the following steps: The lower limits for the drive current, modulation period, and half-wave voltage of the all-fiber current transformer to be debugged are preset. The lower limit of the drive current is set as the initial drive current; The lower limit of the modulation period is determined as the initial modulation period; The lower limit of the half-wave voltage adjustment is set as the initial half-wave voltage.

3. The commissioning method for the all-fiber current transformer according to claim 1, characterized in that, Increase the initial drive current, increase the modulation period, and increase the half-wave voltage by following these steps: Based on the hardware precision of the optical module's drive current, the drive current increment is preset so that the initial drive current increases according to the drive current increment. Based on the hardware precision of the PCB board, the modulation period increment and half-wave voltage increment are preset so that the initial modulation period increases according to the modulation period increment and the initial half-wave voltage increases according to the half-wave voltage increment.

4. The commissioning method for the all-fiber current transformer according to claim 3, characterized in that, Also includes: The upper limit for increasing the preset drive current, the upper limit for increasing the modulation period, and the upper limit for increasing the half-wave voltage are set. Based on the upper limit of the increase in the drive current, the upper limit of the increase in the modulation period, and the upper limit of the increase in the half-wave voltage, the optimal drive current, the optimal modulation period, and the optimal half-wave voltage are modulated.

5. A fully fiber optic current transformer, characterized in that, Includes a controller that executes instructions to implement the following method steps: Configure the initial drive current, initial modulation period, and initial half-wave voltage; When the comb voltage is greater than the first comb voltage threshold, the initial drive current is increased until the comb voltage is less than the first comb voltage threshold, thus obtaining the first drive current. Replace the initial drive current with the first drive current. When the modulation period is less than the first modulation period, increase the modulation period and determine the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period. Select the narrowest comb wave from all comb wave peak widths and determine the modulation period corresponding to the comb wave as the optimal modulation period. Replace the initial modulation period with the optimal modulation period to trigger the reset of the all-fiber current transformer. When the step value corresponding to the initial half-wave voltage is not zero, increase the half-wave voltage until the step value corresponding to the half-wave voltage is zero to obtain the optimal half-wave voltage. Based on the optimal half-wave voltage, the driving current is increased on the basis of the first driving current until the comb wave voltage reaches the first comb wave voltage threshold, thus obtaining the optimal driving current.

6. The all-fiber current transformer according to claim 5, characterized in that, Configure the initial drive current, initial modulation period, and initial half-wave voltage using the following steps: The lower limits for the drive current, modulation period, and half-wave voltage of the all-fiber current transformer to be debugged are preset. The lower limit of the drive current is set as the initial drive current; The lower limit of the modulation period is determined as the initial modulation period; The lower limit of the half-wave voltage adjustment is set as the initial half-wave voltage.

7. The all-fiber current transformer according to claim 5, characterized in that, Increase the initial drive current, increase the modulation period, and increase the half-wave voltage by following these steps: Based on the hardware precision of the optical module's drive current, the drive current increment is preset so that the initial drive current increases according to the drive current increment. Based on the hardware precision of the PCB board, the modulation period increment and half-wave voltage increment are preset so that the initial modulation period increases according to the modulation period increment and the initial half-wave voltage increases according to the half-wave voltage increment.

8. The all-fiber current transformer according to claim 5, characterized in that, Also includes: The upper limit for increasing the preset drive current, the upper limit for increasing the modulation period, and the upper limit for increasing the half-wave voltage are set. Based on the upper limit of the increase in the drive current, the upper limit of the increase in the modulation period, and the upper limit of the increase in the half-wave voltage, the optimal drive current, the optimal modulation period, and the optimal half-wave voltage are modulated.

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