CN113030830A - Method and system for testing accuracy of harmonic wave of optical fiber current transformer - Google Patents
Method and system for testing accuracy of harmonic wave of optical fiber current transformer Download PDFInfo
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- CN113030830A CN113030830A CN202110258976.9A CN202110258976A CN113030830A CN 113030830 A CN113030830 A CN 113030830A CN 202110258976 A CN202110258976 A CN 202110258976A CN 113030830 A CN113030830 A CN 113030830A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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
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Abstract
The invention discloses a method and a system for testing the harmonic accuracy of an optical fiber current transformer, wherein required harmonic frequency components are superposed on a current signal with rated frequency through a signal generator to obtain a harmonic-containing current signal; amplifying the signal waveform by a power amplifier and a broadband current booster to provide a primary current test signal; acquiring output current signals of an optical fiber current transformer and a standard current transformer which are connected into a current loop in real time; inputting output signals of the optical fiber current transformer and the standard current transformer which are acquired in real time into an electronic current transformer calibrator, and obtaining the measurement accuracy of the optical fiber current transformer through programming calculation; and the signal generator is adjusted to superpose the harmonics of different frequency components for testing. The method can measure the accuracy of the optical fiber current transformer under the condition of superposing different frequency component harmonics, and is helpful for testing whether the optical fiber current transformer meets the harmonic accuracy requirement specified by the standard or not by comparing with the accuracy threshold specified by the standard.
Description
Technical Field
The invention relates to the technical field of power equipment test detection, in particular to a method and a system for testing harmonic accuracy of an optical fiber current transformer.
Background
With the development of power systems, a large number of nonlinear loads, flexible power transmission systems and rail transit loads are connected into a power grid, so that a large number of higher harmonics are generated in the power grid. The optical fiber current transformer is used as a current measuring device for a large number of applications in the current high-voltage direct-current engineering, and harmonic waves have great influence on the metering, quality measurement and relay protection performance of the optical fiber current transformer. Therefore, the optical fiber current transformer ensures the measurement accuracy under the condition of harmonic current, and has important significance for power grid harmonic management and relay protection configuration.
The harmonic accuracy of the electronic current transformer is specified in the existing national standard, but the standard also indicates that the test circuit which generates the primary current required by the harmonic accuracy test is difficult to obtain. The optical fiber current transformer is used as one of electronic current transformers, the harmonic measurement performance of the optical fiber current transformer is greatly influenced by the filtering module, and the harmonic accuracy may have larger errors. In order to enable the optical fiber current transformer to be better applied, a proper harmonic accuracy testing method is adopted to carry out the test, so that the method has certain research value.
Disclosure of Invention
Aiming at the defects of the existing test, the invention aims to provide a method and a system for testing the harmonic accuracy of an optical fiber current transformer, which aim to solve the problem that the primary current superposed with each harmonic frequency component in the existing harmonic accuracy test is difficult to obtain and research the measurement accuracy of the optical fiber current transformer superposed with different subharmonic frequency components.
In order to achieve the purpose, the invention provides a method for testing the harmonic accuracy of an optical fiber current transformer, which comprises the following steps:
step 1, acquiring harmonic current-containing signals, and superposing required harmonic frequency components on the current signals with rated frequency through a signal generator;
step 2, amplifying the signal waveform by a power amplifier and a broadband current booster to provide a primary current test signal;
step 3, collecting output current signals of the optical fiber current transformer and the standard current transformer which are connected into the current loop in real time;
step 4, inputting output signals of the optical fiber current transformer and the standard current transformer which are collected in real time into an electronic current transformer calibrator, and obtaining the measurement accuracy of the optical fiber current transformer through programming calculation;
and 5, adjusting the signal generator to superpose the harmonic waves of different frequency components for testing, and completing the measurement of the accuracy of the harmonic waves of the optical fiber current transformer.
Further, the step 1 specifically includes:
step 1.1, determining the times of overlapping harmonic frequency components according to the harmonic accuracy test requirements specified by the national standard, wherein the times of overlapping harmonic frequency components are generally 3-13 times, and if quality measurement is carried out, the measured harmonic needs to be 50 times;
and 1.2, according to the requirement of overlapping harmonic frequency components, overlapping the harmonics of different frequency components by using a dynamic waveform signal generator to obtain harmonic-containing current signals.
Further, the step 3 specifically includes:
step 3.1, converting the current signal output by the standard current transformer into a voltage signal through a standard resistor, and collecting the voltage signal in real time through a collecting unit;
and 3.2, acquiring the output current signal of the optical fiber current transformer connected into the current loop in real time through the merging unit acquisition module.
Further, the step 4 specifically includes:
step 4.1, inputting the output current signal acquired in real time to an electronic current transformer calibrator through a merging unit and a protocol converter;
and 4.2, comparing output signals of the optical fiber current transformer and the standard current transformer in real time, and carrying out programming calculation to obtain the measurement accuracy of the optical fiber current transformer.
Further, the step 4 further includes: in order to ensure the calculation accuracy of the measurement accuracy, a synchronous clock signal is generated to keep the output signals of the optical fiber current transformer and the standard current transformer synchronous; establishing an electronic current transformer calibrator based on a Labview platform; the measurement accuracy is characterized by a specific difference and an angular difference; in order to improve the measurement accuracy, the average value of the specific difference and angular difference measurement values output in 10 periods is selected as a final result.
Further, the step 5 specifically includes:
step 5.1, performing harmonic accuracy test by adjusting the dynamic waveform signal generator to superpose harmonics of different frequency components, and confirming real-time accuracy change;
and 5.2, comparing the harmonic accuracy with a standard specified accuracy threshold value, and confirming the application range of the harmonic measurement of the measured optical fiber current transformer.
Further, a fiber optic current transformer harmonic accuracy testing system is provided, the system comprising:
and the signal generator adopts a dynamic waveform signal generator and is used for superposing each harmonic frequency component on a rated frequency waveform and outputting a harmonic-containing waveform signal.
The power amplification unit consists of a power amplifier and a broadband current booster and is used for amplifying a signal containing harmonic waveform and providing a primary current test signal.
The standard current transformer is a high-precision and broadband current transformer, the accuracy grade of the standard current transformer is generally 1-2 orders of magnitude lower than that of a tested optical fiber current transformer, and the standard current transformer can keep higher measurement accuracy in a larger frequency range and is used for measuring standard output current.
And the current acquisition unit is used for acquiring output current signals of the tested optical fiber current transformer and the standard current transformer in real time.
The electronic current transformer calibrator is designed based on a Labview platform and is used for comparing the outputs of a tested optical fiber current transformer and a standard current transformer in real time and calculating an output ratio difference and an angle difference value.
From the above description of the present invention, it can be seen that the present invention has at least one of the following advantages compared with the prior art:
1. according to the invention, the harmonic current test signal is determined by superposing different harmonic frequency components on the rated frequency through the dynamic waveform signal generator according to the national standard, which is beneficial to improving the accuracy and reliability of the measured harmonic accuracy of the optical fiber current transformer.
2. The invention adopts a high-precision broadband current transformer as a standard current transformer to measure the standard output current, the accuracy grade of the high-precision broadband current transformer is 1-2 orders of magnitude lower than that of the measured optical fiber current transformer, the high measurement accuracy can be kept in a large frequency range, and the accuracy of harmonic accuracy measurement can be further improved.
3. The electronic current transformer calibrator is used for calculating, and the average value of the specific difference and angular difference measurement values output in 10 periods is selected as the final test result, so that the accuracy of the measured data is further improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be obtained by reference to the following drawings.
FIG. 1 is a flow chart of a test method of the present invention;
FIG. 2 is a block diagram of the test system of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1, a preferred embodiment of the present invention, a method for testing harmonic accuracy of an optical fiber current transformer, includes:
step 1, acquiring harmonic current-containing signals, and superposing required harmonic frequency components on the current signals with rated frequency through a signal generator;
step 2, amplifying the signal waveform by a power amplifier and a broadband current booster to provide a primary current test signal;
step 3, collecting output current signals of the optical fiber current transformer and the standard current transformer which are connected into the current loop in real time;
step 4, inputting output signals of the optical fiber current transformer and the standard current transformer which are collected in real time into an electronic current transformer calibrator, and obtaining the measurement accuracy of the optical fiber current transformer through programming calculation;
and 5, adjusting the signal generator to superpose the harmonic waves of different frequency components for testing, and completing the measurement of the accuracy of the harmonic waves of the optical fiber current transformer.
In this embodiment, the step 1 specifically includes:
step 1.1, determining the times of overlapping harmonic frequency components according to the harmonic accuracy test requirements specified by the national standard, wherein the times of overlapping harmonic frequency components are generally 3-13 times, and if quality measurement is carried out, the measured harmonic needs to be 50 times;
and 1.2, according to the requirement of overlapping harmonic frequency components, overlapping the harmonics of different frequency components by using a dynamic waveform signal generator to obtain harmonic-containing current signals.
In this embodiment, the step 3 specifically includes:
step 3.1, converting the current signal output by the standard current transformer into a voltage signal through a standard resistor, and collecting the voltage signal in real time through a collecting unit;
and 3.2, acquiring the output current signal of the optical fiber current transformer connected into the current loop in real time through the merging unit acquisition module.
In this embodiment, the step 4 specifically includes:
step 4.1, inputting the output current signal acquired in real time to an electronic current transformer calibrator through a merging unit and a protocol converter;
and 4.2, comparing output signals of the optical fiber current transformer and the standard current transformer in real time, and carrying out programming calculation to obtain the measurement accuracy of the optical fiber current transformer.
In the embodiment, in order to ensure the calculation accuracy of the measurement accuracy, a synchronous clock signal is generated to keep the output signals of the optical fiber current transformer and the standard current transformer synchronous; establishing an electronic current transformer calibrator based on a Labview platform; the measurement accuracy is characterized by a specific difference and an angular difference; in order to improve the measurement accuracy, the average value of the specific difference and angular difference measurement values output in 10 periods is selected as a final result.
In this embodiment, the step 5 specifically includes:
step 5.1, performing harmonic accuracy test by adjusting the dynamic waveform signal generator to superpose harmonics of different frequency components, and confirming real-time accuracy change;
and 5.2, comparing the harmonic accuracy with a standard specified accuracy threshold value, and confirming the application range of the harmonic measurement of the measured optical fiber current transformer.
As shown in fig. 2, a fiber optic current transformer harmonic accuracy testing system, the system comprising:
and the signal generator adopts a dynamic waveform signal generator and is used for superposing each harmonic frequency component on a rated frequency waveform and outputting a harmonic-containing waveform signal.
The power amplification unit consists of a power amplifier and a broadband current booster and is used for amplifying a signal containing harmonic waveform and providing a primary current test signal.
The standard current transformer is a high-precision and broadband current transformer, the accuracy grade of the standard current transformer is generally 1-2 orders of magnitude lower than that of a tested optical fiber current transformer, and the standard current transformer can keep higher measurement accuracy in a larger frequency range and is used for measuring standard output current.
And the current acquisition unit is used for acquiring output current signals of the tested optical fiber current transformer and the standard current transformer in real time.
The electronic current transformer calibrator is designed based on a Labview platform and is used for comparing the outputs of a tested optical fiber current transformer and a standard current transformer in real time and calculating an output ratio difference and an angle difference value.
According to the invention, the harmonic current test signal is determined by superposing different harmonic frequency components on the rated frequency through the dynamic waveform signal generator according to the national standard, which is beneficial to improving the accuracy and reliability of the measured harmonic accuracy of the optical fiber current transformer. The invention adopts a high-precision broadband current transformer as a standard current transformer to measure the standard output current, the accuracy grade of the high-precision broadband current transformer is 1-2 orders of magnitude lower than that of the measured optical fiber current transformer, the high measurement accuracy can be kept in a large frequency range, and the accuracy of harmonic accuracy measurement can be further improved. The electronic current transformer calibrator is used for calculating, and the average value of the specific difference and angular difference measurement values output in 10 periods is selected as the final test result, so that the accuracy of the measured data is further improved.
The first embodiment is as follows:
fig. 1 is a flowchart of a method for testing accuracy of a harmonic wave of an optical fiber current transformer according to an embodiment, and a specific implementation process includes the following steps:
(1) acquiring a harmonic-containing current signal, and superposing required harmonic frequency components on the current signal with the rated frequency through a signal generator;
according to the national standard GB/T20840.8-2007 part 8 of the mutual inductor: electronic current transformer can obtain a method for obtaining a signal containing harmonic current, for example, for an optical fiber current transformer measuring a rated frequency of 50Hz and a rated primary current of 1000A, the above national standard requirements are consulted, and superposition is performed according to the condition that a harmonic current component is a certain percentage of the rated primary current, for example, 3-order harmonic current component accounts for 5%. The desired harmonic-containing current signal can be obtained by adjusting the dynamic waveform signal generator to superimpose the harmonic frequency components.
(2) Amplifying the signal waveform by a power amplifier and a broadband current booster to provide a primary current test signal;
according to the national standard GB/T20840.8-2007 part 8 of the mutual inductor: the electronic current transformer can obtain the harmonic frequency components required by the harmonic test under the ideal condition on the rated frequency and the rated primary current. The power amplification unit consists of a high-power low-noise power amplifier and a broadband current booster and is used for amplifying a signal containing harmonic current to enable the signal to meet the rated primary current.
(3) Acquiring output current signals of an optical fiber current transformer and a standard current transformer which are connected into a current loop in real time;
the output current signal of the high-precision broadband standard current transformer is converted into a voltage signal through a standard resistor of 1 omega and is collected in real time through the collecting unit, and the output current signal of the optical fiber current transformer is collected in real time through the collecting module of the merging unit.
(4) Inputting output signals of the optical fiber current transformer and the standard current transformer which are acquired in real time into an electronic current transformer calibrator, and obtaining the measurement accuracy of the optical fiber current transformer through programming calculation;
the output signal of the standard current transformer acquired in real time is input into an electronic current transformer calibrator through a digital acquisition module; the output signal of the optical fiber current transformer collected in real time is converted into a digital FT3 signal through a merging unit, and is converted into a TCP/IP signal through a protocol converter to be input into an electronic current transformer calibrator. In order to ensure the calculation accuracy of the measurement accuracy, a synchronous clock signal is generated to keep the output signals of the optical fiber current transformer and the standard current transformer synchronous; an electronic current transformer calibrator based on a Labview platform calculates measurement accuracy through programming, and is usually characterized by a specific difference and an angular difference; in order to improve the measurement accuracy, the average value of the specific difference and angular difference measurement values output in 10 periods is selected as a final result.
(5) Adjusting the harmonic wave of the signal generator with different frequency components to test, and completing the measurement of the harmonic wave accuracy of the optical fiber current transformer
According to the harmonic-containing signal obtained in the step (1), a primary current test signal is provided through the amplification of the power amplification unit in the step (2), the harmonic accuracy of the optical fiber current transformer is obtained through the collection, comparison and calculation of the output current signals of the standard current transformer and the optical fiber current transformer in the steps (3) and (4), the dynamic waveform signal generator is adjusted to superpose the harmonics of different frequency components for testing, the change of the harmonic accuracy is confirmed, the harmonic accuracy is compared with a standard specified accurate threshold value, the harmonic measurement application range of the measured optical fiber current transformer is confirmed, and the measurement of the harmonic accuracy of the optical fiber current transformer is completed.
The invention provides a method and a system for testing the harmonic accuracy of an optical fiber current transformer, which aim to solve the problem that primary current superposed with each harmonic frequency component in the existing harmonic accuracy test is difficult to obtain and research the measurement accuracy of the optical fiber current transformer superposed with different subharmonic frequency components.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for testing the harmonic accuracy of an optical fiber current transformer is characterized by comprising the following steps:
step 1, acquiring harmonic current-containing signals, and superposing required harmonic frequency components on the current signals with rated frequency through a signal generator;
step 2, amplifying the signal waveform by a power amplifier and a broadband current booster to provide a primary current test signal;
step 3, collecting output current signals of the optical fiber current transformer and the standard current transformer which are connected into the current loop in real time;
step 4, inputting output signals of the optical fiber current transformer and the standard current transformer which are collected in real time into an electronic current transformer calibrator, and obtaining the measurement accuracy of the optical fiber current transformer through programming calculation;
and 5, adjusting the signal generator to superpose the harmonic waves of different frequency components for testing, and completing the measurement of the accuracy of the harmonic waves of the optical fiber current transformer.
2. The method for testing the harmonic accuracy of the optical fiber current transformer according to claim 1, wherein the step 1 specifically comprises the following sub-steps:
step 1.1, determining the times of overlapping harmonic frequency components according to the harmonic accuracy test requirements specified by the national standard, wherein the times of overlapping harmonic frequency components are 3-13 times, and if quality measurement is carried out, the measured harmonic needs to reach 50 times;
and 1.2, according to the requirement of overlapping harmonic frequency components, overlapping the harmonics of different frequency components by using a dynamic waveform signal generator to obtain harmonic-containing current signals.
3. The method for testing the harmonic accuracy of the optical fiber current transformer according to claim 1, wherein the step 3 specifically comprises the following sub-steps:
step 3.1, converting the current signal output by the standard current transformer into a voltage signal through a standard resistor, and collecting the voltage signal in real time through a collecting unit;
and 3.2, acquiring the output current signal of the optical fiber current transformer connected into the current loop in real time through the merging unit acquisition module.
4. The method for testing the harmonic accuracy of the optical fiber current transformer according to claim 1, wherein the step 4 specifically comprises the following sub-steps:
step 4.1, inputting the output current signal acquired in real time to an electronic current transformer calibrator through a merging unit and a protocol converter;
and 4.2, comparing output signals of the optical fiber current transformer and the standard current transformer in real time, and carrying out programming calculation to obtain the measurement accuracy of the optical fiber current transformer.
5. The method for testing the harmonic accuracy of the fiber optic current transformer of claim 4, further comprising: in order to ensure the calculation accuracy of the measurement accuracy, a synchronous clock signal is generated to keep the output signals of the optical fiber current transformer and the standard current transformer synchronous; establishing an electronic current transformer calibrator based on a Labview platform; the measurement accuracy is characterized by a specific difference and an angular difference; in order to improve the measurement accuracy, the average value of the specific difference and angular difference measurement values output in 10 periods is selected as a final result.
6. The method for testing the harmonic accuracy of the fiber optic current transformer according to claim 1, wherein the step 5 specifically comprises the following sub-steps:
step 5.1, performing harmonic accuracy test by adjusting the dynamic waveform signal generator to superpose harmonics of different frequency components, and confirming real-time accuracy change;
and 5.2, comparing the harmonic accuracy with a standard specified accuracy threshold value, and confirming the application range of the harmonic measurement of the measured optical fiber current transformer.
7. A system for testing harmonic accuracy of a fiber optic current transformer, the system comprising:
the signal generator adopts a dynamic waveform signal generator and is used for superposing each harmonic frequency component on a rated frequency waveform and outputting a harmonic-containing waveform signal;
the power amplification unit consists of a power amplifier and a broadband current booster and is used for amplifying a signal containing harmonic waveform and providing a primary current test signal;
the standard current transformer is used for measuring standard output current;
the current acquisition unit is used for acquiring output current signals of the tested optical fiber current transformer and the standard current transformer in real time;
the electronic current transformer calibrator is designed based on a Labview platform and is used for comparing the outputs of a tested optical fiber current transformer and a standard current transformer in real time and calculating an output ratio difference and an angle difference value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325160A (en) * | 2021-11-19 | 2022-04-12 | 国网山东省电力公司电力科学研究院 | Method for testing alternating current response time of automatic detection device of relay protection tester |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872005A (en) * | 2010-06-04 | 2010-10-27 | 中国计量学院 | Periodic non-sinusoidal wave reference of electronic current transformer with current booster |
| CN102385013A (en) * | 2011-10-21 | 2012-03-21 | 国网电力科学研究院 | Method and device for detecting harmonic characteristic of electronic current transformer |
| CN103837852A (en) * | 2013-09-23 | 2014-06-04 | 国家电网公司 | All-fiber electronic current transformer frequency characteristic testing device and testing method |
| CN110297204A (en) * | 2019-06-17 | 2019-10-01 | 中国电力科学研究院有限公司 | The verifying power supply device and power source providing method of all-fiber current transformator wideband check system |
| CN110297203A (en) * | 2019-06-17 | 2019-10-01 | 中国电力科学研究院有限公司 | A kind of system and method for DC voltage transformer progress wideband verification |
| CN110426667A (en) * | 2019-06-17 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of system and method for all-fiber current transformator progress wideband verification |
| CN210864019U (en) * | 2019-06-17 | 2020-06-26 | 中国电力科学研究院有限公司 | Calibration power supply device of all-fiber current transformer broadband calibration system |
| WO2020194011A1 (en) * | 2019-03-22 | 2020-10-01 | Sandip Shah | Current transformer with optic fiber mode electronic circuit |
| CN211653119U (en) * | 2019-06-17 | 2020-10-09 | 中国电力科学研究院有限公司 | System for carrying out broadband verification on all-fiber current transformer |
-
2021
- 2021-03-10 CN CN202110258976.9A patent/CN113030830A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872005A (en) * | 2010-06-04 | 2010-10-27 | 中国计量学院 | Periodic non-sinusoidal wave reference of electronic current transformer with current booster |
| CN102385013A (en) * | 2011-10-21 | 2012-03-21 | 国网电力科学研究院 | Method and device for detecting harmonic characteristic of electronic current transformer |
| CN103837852A (en) * | 2013-09-23 | 2014-06-04 | 国家电网公司 | All-fiber electronic current transformer frequency characteristic testing device and testing method |
| WO2020194011A1 (en) * | 2019-03-22 | 2020-10-01 | Sandip Shah | Current transformer with optic fiber mode electronic circuit |
| CN110297204A (en) * | 2019-06-17 | 2019-10-01 | 中国电力科学研究院有限公司 | The verifying power supply device and power source providing method of all-fiber current transformator wideband check system |
| CN110297203A (en) * | 2019-06-17 | 2019-10-01 | 中国电力科学研究院有限公司 | A kind of system and method for DC voltage transformer progress wideband verification |
| CN110426667A (en) * | 2019-06-17 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of system and method for all-fiber current transformator progress wideband verification |
| CN210864019U (en) * | 2019-06-17 | 2020-06-26 | 中国电力科学研究院有限公司 | Calibration power supply device of all-fiber current transformer broadband calibration system |
| CN211653119U (en) * | 2019-06-17 | 2020-10-09 | 中国电力科学研究院有限公司 | System for carrying out broadband verification on all-fiber current transformer |
Non-Patent Citations (1)
| Title |
|---|
| 李登云 等: "全光纤电流互感器宽频校验***", 《沈 阳 工 业 大 学 学 报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325160A (en) * | 2021-11-19 | 2022-04-12 | 国网山东省电力公司电力科学研究院 | Method for testing alternating current response time of automatic detection device of relay protection tester |
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