All-fiber current transformer and debugging method thereof

Abstract

The invention relates to an all-fiber current transformer and a debugging method thereof. The debugging method comprises the following steps: configuring an initial driving 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, increasing the initial driving current until the comb wave voltage is less than the first comb wave voltage to obtain a first driving current; replacing the initial driving current with a first driving current, and when the modulation period is smaller than a first modulation period, increasing the modulation period to obtain an optimal modulation period; replacing the initial modulation period with an optimal modulation period, periodically triggering equipment to reset, when a step value corresponding to the initial half-wave voltage is not zero, increasing the half-wave voltage until the step value corresponding to the half-wave voltage is zero to obtain an optimal half-wave voltage, and obtaining an optimal driving current based on the optimal half-wave voltage, intelligent autonomous debugging is constructed among the driving current, the modulation period and the half-wave voltage, and the operation parameters of the all-fiber current transformer are rapidly and accurately calculated.

Description

Technical Field

[0001] The invention relates to an all-optical fiber current transformer and a debugging method thereof, and belongs to the field of power system automation. Background Art

[0002] With the development of the national smart grid and ultra-high voltage grid, traditional electromagnetic current transformers have gradually exposed their fatal defects, such as extremely difficult insulation at high voltage levels, easy magnetic saturation at higher voltages, resulting in reduced measurement accuracy, etc. In contrast, the all-fiber current transformer based on optical sensing technology uses an all-fiber optical path to achieve closed-loop detection of current signals. It has the advantages of 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. It is an important direction for the development of transformer technology. In recent years, with the rapid development of conventional DC transmission projects and flexible DC transmission projects, the market prospects for all-fiber current transformers are broad.

[0003] At the same time, compared with traditional electromagnetic current transformers, all-fiber current transformers use SLD light sources, PINFET components, and lithium niobate optical waveguide phase modulators in the new technology field. However, when debugging the various parameters of the all-fiber current transformer, there are debugging characteristics such as complicated parameters and great debugging difficulty. In addition, no debugging connection and debugging logic have been established between the optical power parameters, modulation cycle parameters, and half-wave voltage parameters, resulting in any inappropriateness in the debugging process will cause abnormal debugging of the other two items, and the debugger 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, and large-scale debugging requires a lot of manpower and equipment costs, which is a problem restricting the large-scale engineering application of products. Summary of the invention

[0004] The purpose of the present invention is to provide an all-optical current transformer and a debugging method thereof, so as 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 highly targeted, intelligent and efficient debugging.

[0005] To achieve the above object, on the one hand, the present invention proposes a debugging method for an all-optical current transformer, comprising: Configure the initial drive current, initial modulation period, and initial half-wave voltage; When the comb wave voltage is greater than the first comb wave voltage threshold, increasing the initial drive current until the comb wave voltage is less than the first comb wave voltage, thereby obtaining a first drive current; The initial driving current is replaced with the first driving current, and 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, a comb wave with the narrowest width is selected from all comb wave peak widths, and the modulation period corresponding to the comb wave is determined as the optimal modulation period; Replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, so as to obtain the optimal half-wave voltage; According to 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, thereby obtaining the optimal driving current.

[0006] Furthermore, the debugging method of the all-optical current transformer configures the initial driving current, the initial modulation period, and the initial half-wave voltage through the following steps: Presetting the lower limit of the drive current, the lower limit of the modulation period and the lower limit of the half-wave voltage of the all-optical current transformer to be debugged; Determine the debugging lower limit of the driving current as the initial driving current; Determine the debugging lower limit of the modulation period as the initial modulation period; The debugging lower limit of the half-wave voltage is determined as the initial half-wave voltage.

[0007] Furthermore, the debugging method of the all-optical current transformer increases the initial driving current, increases the modulation period, and increases the half-wave voltage through the following steps: According to the hardware accuracy of the driving current of the optical module, the driving current increment is preset so that the initial driving current increases according to the driving current increment; According to the hardware accuracy of the PCB board, the modulation period increment and the 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.

[0008] Furthermore, the debugging method of the all-optical current transformer further includes: Preset the upper limit of the increase of the driving current, the upper limit of the increase of the modulation period and the upper limit of the increase of the half-wave voltage; Based on the upper limit of increase of the driving current, the upper limit of increase of the modulation period, and the upper limit of increase of the half-wave voltage, modulation of the optimal driving current, the optimal modulation period, and the optimal half-wave voltage is performed.

[0009] On the other hand, the present invention also provides an all-optical current transformer, including a controller, wherein the controller executes instructions to implement the following method steps: Configure the initial drive current, initial modulation period, and initial half-wave voltage; When the comb wave voltage is greater than the first comb wave voltage threshold, increasing the initial drive current until the comb wave voltage is less than the first comb wave voltage, thereby obtaining a first drive current; The initial driving current is replaced with the first driving current, and 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, a comb wave with the narrowest width is selected from all comb wave peak widths, and the modulation period corresponding to the comb wave is determined as the optimal modulation period; Replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, so as to obtain the optimal half-wave voltage; According to 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, thereby obtaining the optimal driving current.

[0010] Furthermore, the all-optical current transformer is configured with the following steps to configure the initial driving current, initial modulation period, and initial half-wave voltage: Presetting the lower limit of the drive current, the lower limit of the modulation period and the lower limit of the half-wave voltage of the all-optical current transformer to be debugged; Determine the debugging lower limit of the driving current as the initial driving current; Determine the debugging lower limit of the modulation period as the initial modulation period; The debugging lower limit of the half-wave voltage is determined as the initial half-wave voltage.

[0011] Furthermore, the all-optical current transformer increases the initial driving current, increases the modulation period, and increases the half-wave voltage through the following steps: According to the hardware accuracy of the driving current of the optical module, the driving current increment is preset so that the initial driving current increases according to the driving current increment; According to the hardware accuracy of the PCB board, the modulation period increment and the 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.

[0012] Furthermore, the above-mentioned all-optical current transformer also includes: Preset the upper limit of the increase of the driving current, the upper limit of the increase of the modulation period and the upper limit of the increase of the half-wave voltage; Based on the upper limit of increase of the driving current, the upper limit of increase of the modulation period, and the upper limit of increase of the half-wave voltage, modulation of the optimal driving current, the optimal modulation period, and the optimal half-wave voltage is performed.

[0013] The beneficial effects of the present invention are as follows: configuring an initial drive current, an initial modulation cycle, and an initial half-wave voltage; when the comb wave voltage is greater than a first comb wave voltage threshold, increasing the initial drive current until the comb wave voltage is less than the first comb wave voltage, and obtaining a first drive current; replacing the initial drive current with the first drive current, and when the modulation cycle is less than the first modulation cycle, increasing the modulation cycle and determining the peak width corresponding to each modulation cycle until the modulation cycle is greater than the first modulation cycle, selecting a comb wave with the narrowest width from all comb wave peak widths, and determining the modulation cycle corresponding to the comb wave as the optimal modulation cycle ; Replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, and obtain the optimal half-wave voltage; according to the optimal half-wave voltage, increase the driving current on the basis of the first driving current until the comb wave voltage reaches the first comb wave voltage, and obtain the optimal driving current, so as to realize the intelligent autonomous debugging between the driving current, modulation cycle and half-wave voltage, quickly and accurately calculate the operating parameters of the all-optical current transformer, and greatly reduce the equipment installation, debugging and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of a debugging method of an all-optical current transformer according to one aspect of the present invention; Figure 2 It is a flow chart of a debugging method of an all-optical fiber current transformer in an actual application scenario according to one aspect of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] The idea of ​​the present invention is to realize mutual debugging among the optimal driving current, the optimal modulation period and the optimal half-wave voltage by configuring the initial driving current, the initial modulation period and the initial half-wave voltage in combination with the comb wave voltage, the peak width and the step value, so as to quickly and accurately calculate the operating parameters of the all-optical current transformer, improve the accuracy of equipment debugging and shorten the debugging cycle.

[0017] Method Example 1: like Figure 1 FIG. 1 is a flow chart of a method for debugging an all-optical current transformer according to one aspect of the present invention, wherein the method comprises steps S11-S15, specifically: Step S11, configure the initial driving current, the initial modulation period, and the initial half-wave voltage. Specifically, in the actual application scenario, the debugging lower limit of the driving current is set with reference to the hardware accuracy of the driving current of the optical module; the debugging lower limit of the modulation period and the debugging lower limit of the half-wave voltage are set with reference to the hardware PCB (Printed Circuit Board) board DA (Digital-to-Analog Converter) chip, and the debugging lower limit of the driving current is determined as the initial driving current; the debugging lower limit of the modulation period is determined as the initial modulation period; and the debugging lower limit of the half-wave voltage is determined as the initial half-wave voltage.

[0018] After the parameter configuration takes effect, step S12 is executed. When the comb wave voltage is greater than the first comb wave voltage threshold, the initial drive current is increased until the comb wave voltage is less than the first comb wave voltage to obtain the first drive current; here, the first comb wave voltage threshold refers to the voltage threshold that makes the drive current accuracy in the all-optical current transformer reach the optimal value, so as to ensure that the modulated first drive current reaches the accuracy of the drive current in the all-optical 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 increase upper limit are preset, so that the initial drive current increases according to the drive current increment, and the optimal drive current / first drive current is modulated within the drive current increase upper limit, so as to ensure that during the parameter debugging process, the parameter value is optimal and the hardware state is also optimal.

[0019] Step S13, replacing the initial drive current with the first drive current, when the modulation period is less than the first modulation period, increasing the modulation period and determining the peak width corresponding to each modulation period until the modulation period is greater than the first modulation period, selecting the narrowest comb wave from all comb wave peak widths, and determining the modulation period corresponding to the comb wave as the optimal modulation period; Here, the first modulation period refers to the cycle threshold value that makes the driving current accuracy in the all-optical current transformer reach the optimal period; the peak width refers to the peak width of the comb wave corresponding to the modulation period; at the same time, according to the hardware accuracy of the PCB board, the modulation period increment and the increase upper limit are preset, so that the initial modulation period increases according to the modulation period increment, and the optimal modulation period is modulated within the modulation period increase upper limit, thereby realizing the debugging of the comb wave peak width in the all-optical current transformer.

[0020] Step S14, replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, and obtain the optimal half-wave voltage; here, the step value refers to the step difference between the flat areas of different comb waves, and the step value is zero to ensure that there is no current output and generation during the debugging process; at the same time, according to the hardware accuracy of the PCB board, preset the half-wave voltage increment and the increase upper limit, so that the initial half-wave voltage increases according to the half-wave voltage increment, and modulate the optimal half-wave voltage within the half-wave voltage increase upper limit; at the same time, in the preferred embodiment of the present application, it is preferred that the all-optical current transformer performs a 2π reset to avoid the problem of debugging failure caused by exceeding the hardware load during the debugging process.

[0021] Since the half-wave voltage is modulated to the optimal half-wave voltage, the comb-wave voltage increases accordingly. In order to optimize the driving current, step S15 is executed to increase the driving current based on the first driving current according to the optimal half-wave voltage until the comb-wave voltage reaches the first comb-wave voltage to obtain the optimal driving current.

[0022] Through the above steps S11 to S15, the debugging logic between the driving current, the modulation period and the half-wave voltage is constructed, and the debugging process of the three parameters operating in coordination with each other is realized, which is more conducive to the efficient and intelligent execution of the all-optical current transformer. The debugging method is simple and highly practical, providing reliability support for large-scale promotion and application.

[0023] In a preferred embodiment of the present application, the lower limit I of the drive current is preferably set with reference to the drive current hardware accuracy of the optical module. min , set the lower limit of the drive current I min Determined as the initial drive current I 0 ; Refer to the PCB board DA chip accuracy to set the lower limit T of the modulation cycle min And the lower limit of half-wave voltage V min , set the lower limit of the modulation cycle T min Determined as the initial modulation period T 0 , set the lower limit of half-wave voltage V min Determined as the initial half-wave voltage V 0 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 ; Preferably the first comb wave voltage threshold is -100mV, the drive current increment is δI and the increase upper limit is I max , when V comb_wave >-100mV, at I 0 On the basis of increasing δI and not exceeding I max, and after each increase, determine whether the comb wave voltage is greater than -100mV; when V comb_wave ≤-100mV, the current I x Determined as the first driving current I 1 .

[0024] According to the hardware accuracy of the PCB board, the first modulation period is preferably 5 μs, the modulation period increment is δT, and the increase upper limit is T max ; Configure I for all-fiber current transformer 1 , T 0 and V 0 ; After the configuration takes effect, the peak width of the comb wave generated by the current optical module is recorded; when T 0 ≤5μs, at T 0 On the basis of increasing δT and not exceeding T max , and record the peak width corresponding to each modulation cycle after each increase; when T x >5μs, the modulation period T x Determine the optimal modulation period T 优 .

[0025] According to the hardware accuracy of the PCB board, the preferred half-wave voltage increment is δV and the upper limit is V max ; Configure I for all-fiber current transformer 1 , T 优 and V 0 ; After the configuration takes effect, it is preferred to trigger the all-fiber current transformer to perform a 2π reset every 1ms; obtain V 0 Corresponding step value V step0 ; When V step0 ≠0, at V 0 Add δV on the basis of V max ; When V appears x The step value V stepx =0, the half-wave voltage V x Determined as the optimal half-wave voltage V 优 .

[0026] According to V 优 , in I 1 On the basis of increasing δI and not exceeding I max , and after each increase, determine whether the comb wave voltage is greater than -100mV; when V comb_wave When ≤-100mV, the current at this time is determined as the optimal drive current I 优 .

[0027] Method Example 2: like Figure 2As shown, it is a flow chart of a debugging method of an all-optical current transformer according to one aspect of the present invention in an actual application scenario, wherein, first, the modulation parameters are initialized, the drive current Idrive is set to 10mA, the modulation period Tmod is set to 2μs, and the half-wave voltage Vhalf_wave is set to 1V; after the parameter configuration takes effect, the comb wave generated by the current optical module is sampled to determine 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 increases by △I (wherein △I is the drive current increment set according to the drive current hardware accuracy of the optical module, preferably △I=1mA); on the basis of Idrive, 1mA is continuously increased until Vcomb_wave < -100mV, and the drive current Idrive1 at this time is recorded to complete the parameter debugging of the first drive current.

[0028] Next, based on the first modulation of the drive current, configure the parameter Idrive to be Idrive1. After the parameter configuration takes effect, record the peak width of the comb wave at this time. Since the current modulation period Tmod has not changed, record the peak width of the comb wave corresponding to the 2μs modulation period at this time. Then determine whether Tmod is greater than 5μs. If Tmod≤5μs, Tmod increases by △T (where △T is the modulation period increment set according to the accuracy of the hardware PCB board DA chip, preferably △T=20ns); continue to increase by 20ns on the basis of 2μs until Tmod>5μs, observe the peak width of all recorded comb waves, select the modulation period corresponding to the narrowest peak width of the comb wave, which is the optimal modulation period Tmod_optimal, and complete the parameter debugging of the modulation period.

[0029] Secondly, on the basis of the optimal modulation period, configure the parameter Tmod to be Tmod_optimal; after the parameter configuration takes effect, start triggering a 2Π reset every 1ms to obtain the step value Vstep corresponding to the half-wave voltage; if Vstep≠0, Vhalf_wave increases by △V (where △V is the half-wave voltage increment set according to the accuracy of the hardware PCB board DA chip, preferably △V=0.5mV); on the basis of Vhalf_wave=1V, continuously increase by 0.5mv, and continuously judge the step value corresponding to the half-wave voltage until Vstep=0, and record the half-wave voltage at this time as the optimal half-wave voltage Vhalf_wave_optimal, and complete the parameter debugging of the half-wave voltage.

[0030] Continuing, as the half-wave voltage increases, the comb wave voltage Vcomb_wave increases accordingly, so repeat the parameter debugging steps of the drive current, and continue to increase 1mA on the basis of Idrive1 until Vcomb_wave < -100mV. The drive current at this time is recorded as the optimal drive current Idrive_optimal, and the parameter debugging of the drive current is completed.

[0031] 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 the parameters do not need to be modulated again in subsequent operations.

[0032] In summary, by setting the debugging parameter threshold, the optimal parameter debugging is obtained. In the actual application scenario, the debugging method program of automatic sampling, automatic calculation, and automatic screening is written, which can quickly and accurately calculate the optimal operating parameters of the all-optical current transformer, greatly reduce the equipment installation, debugging and operation costs, and provide reliability support for large-scale promotion and application.

[0033] At the same time, the debugging logic of optical power debugging, modulation cycle debugging, and half-wave voltage debugging is established to solve the difficult problems of mutual influence, mutual restriction, and repeated correction of various key debugging parameters, improve the correctness of all-optical current transformer debugging, shorten the debugging cycle, and effectively improve the debugging efficiency of all-optical current transformers. At the same time, it lowers the operating threshold for debuggers, reduces the labor input for batch debugging, and greatly reduces the equipment installation, debugging, and operating costs.

[0034] In another aspect of the present application, an all-optical current transformer is also provided, including a controller, the controller is used to implement the steps of the above-mentioned debugging method of the all-optical current transformer. In actual application scenarios, the all-optical current transformer receives the debugging instruction issued by the debugging terminal, and can autonomously complete the debugging of the optimal driving current, the optimal modulation period, and the optimal half-wave voltage. At the same time, the introduction of the above method is sufficiently clear in the embodiment, and will not be repeated here.

Claims

1. A debugging method for an all-optical current transformer, characterized in that: include: Configure the initial drive current, initial modulation period, and initial half-wave voltage; When the comb wave voltage is greater than the first comb wave voltage threshold, increasing the initial drive current until the comb wave voltage is less than the first comb wave voltage, thereby obtaining a first drive current; The initial driving current is replaced with the first driving current, and 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, a comb wave with the narrowest width is selected from all comb wave peak widths, and the modulation period corresponding to the comb wave is determined as the optimal modulation period; Replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, so as to obtain the optimal half-wave voltage; According to 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, thereby obtaining the optimal driving current.

2. The debugging method of the all-optical current transformer according to claim 1, characterized in that: Configure the initial drive current, initial modulation period, and initial half-wave voltage through the following steps: Presetting the lower limit of the drive current, the lower limit of the modulation period and the lower limit of the half-wave voltage of the all-optical current transformer to be debugged; Determine the debugging lower limit of the driving current as the initial driving current; Determine the debugging lower limit of the modulation period as the initial modulation period; The debugging lower limit of the half-wave voltage is determined as the initial half-wave voltage.

3. The debugging method of the all-optical 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 the steps below: According to the hardware accuracy of the driving current of the optical module, the driving current increment is preset so that the initial driving current increases according to the driving current increment; According to the hardware accuracy of the PCB board, the modulation period increment and the 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 debugging method of the all-optical current transformer according to claim 3, characterized in that: Also includes: Preset the upper limit of the increase of the driving current, the upper limit of the increase of the modulation period and the upper limit of the increase of the half-wave voltage; Based on the upper limit of increase of the driving current, the upper limit of increase of the modulation period, and the upper limit of increase of the half-wave voltage, modulation of the optimal driving current, the optimal modulation period, and the optimal half-wave voltage is performed.

5. An all-optical current transformer, characterized in that: The method comprises 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 wave voltage is greater than the first comb wave voltage threshold, increasing the initial drive current until the comb wave voltage is less than the first comb wave voltage, thereby obtaining a first drive current; The initial driving current is replaced with the first driving current, and 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, a comb wave with the narrowest width is selected from all comb wave peak widths, and the modulation period corresponding to the comb wave is determined as the optimal modulation period; Replace the initial modulation cycle with the optimal modulation cycle, trigger the reset of the all-optical current transformer, and 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, so as to obtain the optimal half-wave voltage; According to 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, thereby obtaining the optimal driving current.

6. The all-optical fiber current transformer according to claim 5, characterized in that: Configure the initial drive current, initial modulation period, and initial half-wave voltage through the following steps: Presetting the lower limit of the drive current, the lower limit of the modulation period and the lower limit of the half-wave voltage of the all-optical current transformer to be debugged; Determine the debugging lower limit of the driving current as the initial driving current; Determine the debugging lower limit of the modulation period as the initial modulation period; The debugging lower limit of the half-wave voltage is determined as the initial half-wave voltage.

7. The all-optical 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 the steps below: According to the hardware accuracy of the driving current of the optical module, the driving current increment is preset so that the initial driving current increases according to the driving current increment; According to the hardware accuracy of the PCB board, the modulation period increment and the 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-optical fiber current transformer according to claim 5, characterized in that: Also includes: Preset the upper limit of the increase of the driving current, the upper limit of the increase of the modulation period and the upper limit of the increase of the half-wave voltage; Based on the upper limit of increase of the driving current, the upper limit of increase of the modulation period, and the upper limit of increase of the half-wave voltage, modulation of the optimal driving current, the optimal modulation period, and the optimal half-wave voltage is performed.

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