CN113777549B - Optical transformer local vibration test method and device based on piezoelectric ceramic principle - Google Patents

Optical transformer local vibration test method and device based on piezoelectric ceramic principle Download PDF

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CN113777549B
CN113777549B CN202110862994.8A CN202110862994A CN113777549B CN 113777549 B CN113777549 B CN 113777549B CN 202110862994 A CN202110862994 A CN 202110862994A CN 113777549 B CN113777549 B CN 113777549B
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vibration
foct
influence
exciter
acceleration
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CN113777549A (en
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刘彬
邓小聘
刘勇
黄华
熊俊军
王晓周
黄咏喜
李金宇
牧晓菁
万罡
冯翔翔
杨帆
陈鹏
王焱
唐芳
金建伟
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China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • G01M7/025—Measuring arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The application discloses a method and a system for testing local vibration of an optical transformer based on a piezoelectric ceramic principle, wherein the method comprises the following steps: determining a vibration sensitive component of the FOCT; applying vibration to the vibration sensitive component by using a vibration exciter; and controlling the vibration acceleration and the vibration frequency of the vibration exciter by an excitation signal source, and obtaining the influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current and rated primary current are applied, so as to obtain the influence of the vibration on the output characteristic of the vibration sensitive group component. When the test conditions do not meet the standard specification, an equivalent vibration test can be carried out on the FOCT based on the piezoelectric ceramic principle, and the influence of vibration on the vibration performance of the FOCT is obtained.

Description

Optical transformer local vibration test method and device based on piezoelectric ceramic principle
Technical Field
The application relates to the technical field of photoelectric transformers, in particular to a method and a device for testing local vibration of an optical transformer based on a piezoelectric ceramic principle.
Background
The basic operation of an optical transformer (FOCT) based on the piezoceramic principle is shown in fig. 1. An LED light source in the electronic case emits an optical signal to be transmitted along a single-mode optical fiber, a polarizer generates a path of linear polarized optical signal to be transmitted along a polarization maintaining optical fiber, a tail fiber of the polarizer is welded with the next section of optical fiber at 45 degrees, and when the linear polarized light enters the next section of polarization maintaining optical fiber, the linear polarized light is orthogonally decomposed into two beams of perpendicular polarized light. When the two beams of light in the vertical mode pass through the 1/4 wave plate, the two beams of light become left-handed circularly polarized light and right-handed circularly polarized light (optical effect of the 1/4 wave plate) respectively, and the two beams of light enter the sensing optical fiber. Because the magnetic field generated by the current to be measured forms Faraday magneto-optical effect in the sensing optical fiber, the two circularly polarized lights are transmitted at different speeds, and phase difference is generated. After the two light signals turn around the conductor for N circles, a reflecting mirror is arranged at the end point of the optical fiber to reflect the light signals back, the polarization direction is also reversed (the left-handed turn to the right-handed turn to the left-handed turn), and the light signals pass through the sensing optical fiber again to interact with the magnetic field generated by the current, so that the acceleration and deceleration effects are doubled due to the reversing. After the two beams of light pass through the 1/4 wave plate again, the two beams of light are restored to linearly polarized light, and interference occurs at the polarizer. The optical detector measures the interference light intensity to detect the phase difference, and the phase difference is proportional to the current flowing through the primary conductor, so as to obtain the magnitude of the measured current.
In actual working condition, when a small section of optical fiber in the FOCT optical path is affected by vibration, the two optical signals generate nonreciprocal phase angle in the round-trip optical pathThe phase angle->Will be phase angle with Faraday->Superimposed on each other, introducing a non-reciprocal phase error as shown in fig. 2.
The relationship of the nonreciprocal phase angle to vibration is as follows:
wherein L is B 、l p The beat length and the length of the optical fiber which is disturbed by vibration; τ 0 Time delay from the reflector for the interference; v (V) b For the amplitude of the vibration,representing the change of beat length along with vibration; />Indicating the change in vibration over time.
As can be seen from the formula (1), the error caused by vibration is related to the length of the optical fiber disturbed by vibration, the time delay from the disturbing position to the reflecting mirror, the vibration amplitude and the vibration acceleration; in addition, when external vibration affects the phase modulator, the modulation factor and thus the modulation depth are affectedModulation depth->The demodulation sensitivity of the transformer is determined, and the accuracy of the transformer is further affected.
To examine the effect of vibration on FOCT, the national standard GB/T20840.6-2017 transformer part 6: the supplementary general technical requirements of low-power transformers prescribe vibration tests of FOCT primary components. According to the standard test requirement, the whole FOCT should be vertically fixed on a vibrating table, and a specified level of vibration is applied, so that the error change of the FOCT is inspected before and after the test, and the state output of the FOCT is monitored in the test process. However, the FOCT based on the piezoelectric ceramic principle is generally used at a higher voltage level, the insulator length may be longer than ten meters, and the general vibration test bench cannot meet the requirement of integral vibration, so that an equivalent alternative test method needs to be found, and the performance influence of vibration on the FOCT based on the piezoelectric ceramic principle is examined.
Disclosure of Invention
In order to solve the problems, the application provides a method for testing local vibration of an optical transformer based on a piezoelectric ceramic principle, which comprises the following steps:
comprising the following steps:
determining a vibration sensitive component of the FOCT;
applying vibration to the vibration sensitive component by using a vibration exciter; and controlling the vibration acceleration and the vibration frequency of the vibration exciter by an excitation signal source, and obtaining the influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current and rated primary current are applied, so as to obtain the influence of the vibration on the output characteristic of the vibration sensitive group component.
Preferably, determining the FOCT to vibration sensitive component comprises:
carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application respectively;
the impact of metal taps on the components of the FOCT groups was qualitatively analyzed to determine the vibration sensitive components.
Preferably, the vibration is applied to the vibration sensitive component by using a vibration exciter, including:
the vibration exciter directly acts on the vibration sensitive component of the FOCT;
a plurality of vibration sensors are respectively arranged on each surface of the vibration sensitive group component;
the data of the vibration sensor is connected to a vibration analyzer, and the vibration analyzer is used for monitoring vibration data of each surface of the vibration sensitive component when the vibration exciter applies vibration.
Preferably, obtaining the effect of vibration acceleration and vibration frequency on the vibration sensitive group member without applying current and applying rated primary current includes:
the vibration acceleration of the vibration exciter is fixed at first and the vibration frequency is changed when no current and rated primary current are applied respectively, so that the influence of the vibration frequency on the vibration sensitive group component is obtained;
and fixing the vibration frequency of the vibration exciter, and changing the vibration acceleration to obtain the influence of the vibration acceleration on the vibration sensitive component.
Preferably, the method further comprises:
after no current and rated primary current are applied to the vibration exciter, a fault recorder is adopted to continuously monitor the FOCT secondary output.
The application also provides an optical transformer local vibration test system based on the piezoelectric ceramic principle, which comprises:
the vibration sensitive component determining module is used for respectively carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application so as to determine the vibration sensitive component of the FOCT;
the characteristic output module is used for applying vibration to the vibration sensitive component by using a vibration exciter; and controlling the vibration acceleration and the vibration frequency of the vibration exciter by an excitation signal source, and obtaining the influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current and rated primary current are applied, so as to obtain the influence of the vibration on the output characteristic of the vibration sensitive group component.
Preferably, the vibration sensitive group component determination module includes:
the metal knocking sub-module is used for respectively carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application;
and the influence analysis submodule is used for qualitatively analyzing influence of metal knocking on all components of the FOCT so as to determine the vibration sensitive components.
Preferably, the characteristic output module includes:
the action submodule is used for directly acting the vibration exciter on the vibration sensitive component of the FOCT;
a sensor arrangement sub-module for arranging a plurality of vibration sensors on each face of the vibration sensitive group member, respectively;
and the monitoring submodule is used for accessing data of the vibration sensor into the vibration analyzer, and the vibration analyzer is used for monitoring vibration data of each surface of the vibration sensitive component when the vibration exciter applies vibration.
Preferably, the characteristic output module includes:
the vibration frequency influence obtaining submodule is used for fixing the vibration acceleration of the vibration exciter and changing the vibration frequency under the conditions of no current application and rated primary current application respectively to obtain the influence of the vibration frequency on the vibration sensitive group component;
and the vibration acceleration influence obtaining submodule is used for fixing the vibration frequency of the vibration exciter, changing the vibration acceleration and obtaining the influence of the vibration acceleration on the vibration sensitive component.
Preferably, the method further comprises:
and the secondary output monitoring module is used for continuously monitoring FOCT secondary output by adopting a fault recorder after no current and rated primary current are applied to the vibration exciter.
Drawings
FIG. 1 is a schematic diagram of an optical transformer based on the piezoelectric ceramic principle according to an embodiment of the present application;
FIG. 2 is a non-reciprocal phase error of a FOCT according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for testing local oscillation of an optical transformer based on the piezoelectric ceramic principle according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a vibration test of a vibration exciter in accordance with an embodiment of the present application;
FIG. 5 is a graph showing the relationship between FOCT output and applied vibration frequency (acceleration: 10 m/s) 2 )；
FIG. 6 is a graph showing the relationship between FOCT output and applied vibration frequency (acceleration of 20 m/s) 2 )；
FIG. 7 is a graph of FOCT output versus vibration acceleration (1700 Hz) in accordance with an embodiment of the present application;
FIG. 8 is a graph of FOCT output versus applied vibration acceleration (2900 Hz) in accordance with an embodiment of the present application;
fig. 9 is a schematic structural diagram of an optical transformer local vibration test system based on the piezoelectric ceramic principle according to an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present application may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present application is not limited to the specific embodiments disclosed below.
The application provides a piezoelectric ceramic principle-based optical transformer local vibration test method, and the flow of the method is shown in figure 3.
Step S101, determining a vibration sensitive component of the FOCT.
Carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application, and monitoring the output current of the FOCT; the impact of metal taps on the components of the FOCT groups was qualitatively analyzed to determine the vibration sensitive components. The metal knocking vibration has no corresponding standard, and the main purpose is to qualitatively analyze the influence of the metal knocking on all components of the FOCT so as to determine the components sensitive to vibration. The specific metal tapping vibration test protocol is shown in table 1.
Table 1 FOCT metal striking vibration test scheme based on piezoelectric ceramic principle
FOCT test condition FOCT applied current
FOCT ambient noise Rated primary current, 0A
Metal knocking sensing ring Rated primary current, 0A
Metal knocking insulator folding position (if any) Rated primary current, 0A
Metal knocking modulation box Rated primary current, 0A
Metal knocking acquisition unit Rated primary current, 0A
Metal knocking FOCT base Rated primary current, 0A
From the test results, the components of the FOCT that are sensitive to vibration were determined.
Step S102, vibration is applied to the vibration sensitive component by using a vibration exciter; and controlling the vibration acceleration and the vibration frequency of the vibration exciter by an excitation signal source, and obtaining the influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current and rated primary current are applied, so as to obtain the influence of the vibration on the output characteristic of the vibration sensitive group component.
After the FOCT vibration sensitive group part is positioned, in order to quantitatively analyze the influence of vibration on the group part, a vibration exciter is adopted to apply vibration to the vibration sensitive group part, a local vibration test is carried out, and a test principle diagram is shown in fig. 4.
The vibration exciter directly acts on the vibration sensitive component of the FOCT; a plurality of vibration sensors are respectively arranged on each surface of the vibration sensitive group component; the data access vibration analyzer of vibration sensor, vibration analyzer is used for monitoring when the vibration exciter applys the vibration, vibration data of each face of vibration sensitive part includes: vibration amplitude, frequency, acceleration, etc. And continuously monitoring FOCT secondary output by adopting a fault recorder when no current is applied and rated primary current is applied respectively. Firstly, fixing the vibration acceleration of a vibration exciter, and changing the vibration frequency to obtain the influence of the vibration frequency on the vibration sensitive group component; and fixing the vibration frequency of the vibration exciter, and changing the vibration acceleration to obtain the influence of the vibration acceleration on the vibration sensitive component. Finally, the influence of vibration on the output characteristics of the FOCT vibration sensitive component is obtained.
The preferred embodiments of the specific application are as follows:
(1) Vibration sensitive location
Vibration (metal tapping) was applied to different parts of the FOCT when no current was applied and 3000A current was applied, and the output current was monitored by a fault recorder, and the test results are shown in tables 2 and 3.
TABLE 2 Metal tapping vibration test (no current)
Product test conditions Test results
The modulation box is normally connected with the base, and vibration caused by the electric wrench is applied to the base Abnormal current maximum 2608A
The modulation box is separated from the base, and the base is knocked by metal No output abnormality
The modulation box is separated from the base, and the metal knocks the optical fiber ring Maximum value of abnormal current 50A
The modulation box is separated from the base, and noise is artificially produced near the modulation box Maximum value of abnormal current 20A
The modulation box is separated from the base, and the metal is knocked to modulate the box Maximum value of abnormal current 3276A
TABLE 3 Metal tapping vibration test (applied current 3000A)
Product test conditions Test results
Front and side of metal knocking modulation box Abnormal currents are 6 times and 4 times rated currents, respectively (maximum 19708A)
Metal knocking modulation box top surface and light CT base Abnormal current is 2 times rated current (maximum value 6453A)
Metal knocking sensing ring and insulator folding part Abnormal current is 2% rated current (maximum value 68A)
Noise is produced around the modulation box No output abnormality
The vibration sensitive part is determined to be a modulation box through the test.
(2) Local vibration experiment
In order to further quantitatively analyze the influence of vibration on the modulation box, a vibration exciter is adopted to conduct a local vibration test on the FOCT, and the test is conducted under fixed acceleration, different frequencies and fixed frequencies and different accelerations respectively. In the light CT standing state, vibration is applied to the front surface of the modulation box through a vibration exciter. 5 vibration sensors are respectively arranged on 5 surfaces of the modulation box, a fault oscillograph is adopted to continuously monitor the secondary output of the light CT, and meanwhile, the vibration value acquired by each vibration sensor is monitored.
1) Fixed vibration acceleration, varying vibration frequency
a) Acceleration of 10m/s 2 The FOCT output versus applied vibration frequency is shown in fig. 5. The error current value of FOCT is large around 1800Hz and 2700Hz, and the maximum value is 1353A.
b) Acceleration of 20m/s 2 The FOCT output versus applied vibration frequency is shown in fig. 6. The error current value of FOCT is large around 1800Hz and 2700Hz, and the maximum value is 2868A.
2) Fixed vibration frequency, varying vibration acceleration
To further investigate the effect of different vibration accelerations on the FOCT output at the same vibration frequency, the following experiments were performed.
a) Setting the output frequency of the vibration exciter to 1700Hz, and the acceleration is 5m/s 2 To 50m/s 2 Recording the output of the FOCT and the vibration sensor under the condition that the primary current is 0A at each test acceleration point;
b) Setting the output frequency of the vibration exciter to 2900Hz and the acceleration to be 5m/s 2 To 50m/s 2 The rest steps are the same as above.
The relationship between the FOCT output and the vibration acceleration is shown in FIGS. 7 and 8, and the amplitude of the abnormal output current increases with the vibration acceleration.
Through vibration tests of a vibration exciter, abnormal output currents with different degrees can be generated for the FOCT along with the increase of vibration acceleration in the frequency range of 200 Hz-10 kHz; the abnormal output current amplitude increases with the increase of the vibration acceleration; under the same vibration frequency and the same vibration acceleration, the abnormal output current caused by vibration is basically consistent in magnitude and is not influenced by the primary current; under the same vibration acceleration condition, the vibration frequency is below 10kHz, the abnormal output current value of the FOCT is larger near two vibration frequency points of 1800Hz and 2700Hz, the maximum value is at 2700Hz, the natural frequency of the FOCT product structure is judged to be near the two frequency points, and when the externally applied excitation frequency is near the natural frequency, a high-amplitude resonance effect is caused, so that the abnormal output current near the two frequency points is maximum.
Based on the same inventive concept, the application also provides an optical transformer local vibration test system 900 based on the piezoelectric ceramic principle, as shown in fig. 9, comprising:
a vibration sensitive component determining module 910, configured to perform metal tapping tests on different parts of the FOCT under the condition that no current is applied and a rated primary current is applied, so as to determine that the FOCT is applied to the vibration sensitive component;
a characteristic output module 920, configured to apply vibration to the vibration sensitive component using a vibration exciter; and controlling the vibration acceleration and the vibration frequency of the vibration exciter by an excitation signal source, and obtaining the influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current and rated primary current are applied, so as to obtain the influence of the vibration on the output characteristic of the vibration sensitive group component.
Preferably, the vibration sensitive group component determination module includes:
the metal knocking sub-module is used for respectively carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application;
and the influence analysis submodule is used for qualitatively analyzing influence of metal knocking on all components of the FOCT so as to determine the vibration sensitive components.
Preferably, the characteristic output module includes:
the action submodule is used for directly acting the vibration exciter on the vibration sensitive component of the FOCT;
a sensor arrangement sub-module for arranging a plurality of vibration sensors on each face of the vibration sensitive group member, respectively;
and the monitoring submodule is used for accessing data of the vibration sensor into the vibration analyzer, and the vibration analyzer is used for monitoring vibration data of each surface of the vibration sensitive component when the vibration exciter applies vibration.
Preferably, the characteristic output module includes:
the vibration frequency influence obtaining submodule is used for fixing the vibration acceleration of the vibration exciter and changing the vibration frequency under the conditions of no current application and rated primary current application respectively to obtain the influence of the vibration frequency on the vibration sensitive group component;
and the vibration acceleration influence obtaining submodule is used for fixing the vibration frequency of the vibration exciter, changing the vibration acceleration and obtaining the influence of the vibration acceleration on the vibration sensitive component.
Preferably, the method further comprises:
and the secondary output monitoring module is used for continuously monitoring FOCT secondary output by adopting a fault recorder after no current and rated primary current are applied to the vibration exciter.
According to the method and the system for testing the local vibration of the optical transformer based on the piezoelectric ceramic principle, when the test conditions do not meet the standard specification, an equivalent vibration test can be carried out on the FOCT based on the piezoelectric ceramic principle, and the influence of vibration on the vibration performance of the FOCT is obtained.

Claims (6)

1. The method for testing the local vibration of the optical transformer based on the piezoelectric ceramic principle is characterized by comprising the following steps of:
determining a component of the FOCT that is sensitive to vibration, comprising:
carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application respectively;
qualitatively analyzing the impact of metal knocks on the components of the FOCT groups to determine vibration sensitive components;
applying vibration to the vibration sensitive component by using a vibration exciter; controlling vibration acceleration and vibration frequency of the vibration exciter by an excitation signal source, obtaining influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current is applied and rated primary current is applied, further obtaining influence of vibration on output characteristics of the vibration sensitive group component, and comprising the following steps:
the vibration acceleration of the vibration exciter is fixed at first and the vibration frequency is changed when no current and rated primary current are applied respectively, so that the influence of the vibration frequency on the vibration sensitive group component is obtained;
and fixing the vibration frequency of the vibration exciter, and changing the vibration acceleration to obtain the influence of the vibration acceleration on the vibration sensitive component.
2. The method of claim 1, wherein applying vibration to the vibration sensitive component using a vibration exciter comprises:
the vibration exciter directly acts on the vibration sensitive component of the FOCT;
a plurality of vibration sensors are respectively arranged on each surface of the vibration sensitive group component;
and the data of the vibration sensor is connected to a vibration analyzer, and the vibration analyzer is used for monitoring vibration data of each surface of the vibration sensitive component when the vibration exciter applies vibration.
3. The method as recited in claim 1, further comprising:
after no current and rated primary current are applied to the vibration exciter, a fault recorder is adopted to continuously monitor the FOCT secondary output.
4. An optical transformer local vibration test system based on a piezoelectric ceramic principle is characterized by comprising:
the vibration sensitive component determining module is used for respectively carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application so as to determine the vibration sensitive component of the FOCT, and comprises the following components:
the metal knocking sub-module is used for respectively carrying out metal knocking tests on different parts of the FOCT under the conditions of no current application and rated primary current application;
the influence analysis submodule is used for qualitatively analyzing influence of metal knocking on all groups of components of the FOCT so as to determine the vibration sensitive group of components;
the characteristic output module is used for applying vibration to the vibration sensitive component by using a vibration exciter; controlling vibration acceleration and vibration frequency of the vibration exciter by an excitation signal source, obtaining influence of the vibration acceleration and the vibration frequency on the vibration sensitive group component under the condition that no current is applied and rated primary current is applied, further obtaining influence of vibration on output characteristics of the vibration sensitive group component, and comprising the following steps:
the vibration frequency influence obtaining submodule is used for fixing the vibration acceleration of the vibration exciter and changing the vibration frequency under the conditions of no current application and rated primary current application respectively to obtain the influence of the vibration frequency on the vibration sensitive group component;
and the vibration acceleration influence obtaining submodule is used for fixing the vibration frequency of the vibration exciter, changing the vibration acceleration and obtaining the influence of the vibration acceleration on the vibration sensitive group component.
5. The system of claim 4, wherein the characteristic output module comprises:
the action submodule is used for directly acting the vibration exciter on the vibration sensitive component of the FOCT;
a sensor arrangement sub-module for arranging a plurality of vibration sensors on each face of the vibration sensitive group member, respectively;
and the monitoring submodule is used for accessing data of the vibration sensor into the vibration analyzer, and the vibration analyzer is used for monitoring vibration data of each surface of the vibration sensitive component when the vibration exciter applies vibration.
6. The system of claim 4, further comprising:
and the secondary output monitoring module is used for continuously monitoring FOCT secondary output by adopting a fault recorder after no current and rated primary current are applied to the vibration exciter.
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全光纤无源电流互感器设计;徐金涛;中国优秀硕士学位论文全文数据库工程科技Ⅱ辑;第5.1节 *
舰船用全光纤电流互感器优化设计;孙旭冉;中国优秀硕士学位论文全文数据库工程科技Ⅱ辑;第5.4节 *

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