CN203422434U - Radiation emission test system - Google Patents
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- CN203422434U CN203422434U CN201320550537.6U CN201320550537U CN203422434U CN 203422434 U CN203422434 U CN 203422434U CN 201320550537 U CN201320550537 U CN 201320550537U CN 203422434 U CN203422434 U CN 203422434U
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Abstract
The utility model provides a radiation emission test system, which relates to the technology field of electromagnetic compatibility test. The radiation emission test system comprises a control apparatus, a signal source, a receiver, a radio communication tester, a radiofrequency signal processor, a filter, a radio frequency cable, a general purpose interface bus GPIB cable, an electric wave darkroom, a preamplifier, a measuring antenna, an antenna tower, an antenna cable, a test rotary table, a radio communication tester antenna and a pre-embedded cable. The preamplifier, the measuring antenna, the antenna tower, the test rotary table and the radio communication tester antenna are arranged in the electric wave darkroom; and the pre-embedded cable is buried in the wall of the electric wave darkroom or underground. The utility model provides the radiation emission test system, which provides electromagnetic compatibility test for wireless communication equipment and wired communication equipment, the system provides a rectification function for the test result, and the accuracy and reliability of the final test result is raised.
Description
Technical Field
The utility model relates to an electromagnetic compatibility tests technical field, specifically, relates to a radiation emission test system.
Background
In the field of electric power, electromagnetic compatibility testing is generally required for intelligent substation equipment to determine whether the intelligent substation equipment can normally operate in a complex electromagnetic environment.
At present, a radiation testing system must be set up according to corresponding national standards for electromagnetic compatibility testing of intelligent substation equipment, and the specifically related technical content is as follows:
1. when the tested device is a non-wireless communication device, the radiation emission test system is required to be designed according to the standard GB9254-2008, and when the tested device is a wireless communication device, the radiation emission test system is required to be designed according to the standard GB/T22450.1-2008.
2. The measurement frequency band of the electromagnetic compatibility test of the non-wireless communication equipment or the electromagnetic compatibility test of the wireless communication equipment is 30 MHz-6 GHz. During measurement, the measurement frequency band needs to be divided into two sub-frequency bands for respective operation, namely, the frequency band below 1GHz (30 MHz-1 GHz) and the frequency band above 1GHz (1 GHz-6 GHz); and the electromagnetic compatibility test of the frequency band below 1GHz must be carried out in a semi-anechoic chamber, and the electromagnetic compatibility test of the frequency band above 1GHz must be carried out after the wave-absorbing material is paved on the ground of the full-anechoic chamber or the semi-anechoic chamber. That is to say, to complete the electromagnetic compatibility test, it is necessary to perform the electromagnetic compatibility test in different measurement sites for different measurement sub-bands, which is actually equivalent to performing two measurements.
3. The electromagnetic compatibility measurement limit (field strength value, unit: dB muV/m) is given by the corresponding measurement standard and is the basis for judgment in the measurement process. If the measured disturbance of the tested equipment exceeds the limit value, the disturbance of the tested equipment is not qualified, otherwise, the disturbance of the tested equipment is qualified.
4. In the standards GB9254-2008 and GB/T22450.1-2008, the limits are given for the frequency bands below 1GHz at a measuring distance of 10m, and for the frequency bands above 1GHz at a measuring distance of 3 m. If the existing measurement site can not measure the distance of 10m and can only measure the distance of 3m, the limit value under the distance of 10m in the standard needs to be converted into the limit value under the distance of 3m, and the conversion formula is as follows: l3m = L10m +20lg (10/3); wherein L3m is the limit value (dB μ V/m) at a measurement distance of 3m, and L10m is the limit value (dB μ V/m) at a measurement distance of 10 m.
5. Because the non-wireless communication equipment is divided into A, B grades, and the disturbance limit values corresponding to the two grades are different, when the non-wireless communication equipment is tested, firstly, whether the grade of the tested equipment is A grade or B grade needs to be confirmed; for wireless communication devices, the disturbance limit is equal to the disturbance limit of class B non-wireless communication devices.
6. In the list of radiation disturbance limits for electromagnetic compatibility, three different types of limits can be seen, namely a quasi-peak (QP) limit for bands below 1GHz, an Average (AV) limit and a Peak (PK) limit for bands above 1 GHz. Therefore, when measuring the disturbance, the receiver must be set to the corresponding detection mode (the detection mode is for the detector in the receiver), otherwise the result will be incorrect.
At present, the built radiation emission test systems for the electromagnetic compatibility test of the intelligent substation equipment are not good and uniform, the uncertainty influence factors of the built radiation emission test systems on the electromagnetic compatibility test are not considered, and the accuracy of the result obtained by the final test is not high enough.
SUMMERY OF THE UTILITY MODEL
The utility model provides a main aim at provides a radiation emission test system to a system for carrying out the electromagnetic compatibility test to intelligent substation equipment is provided.
In order to achieve the above object, an embodiment of the present invention provides a radiation emission testing system, including: the device comprises control equipment, a signal source, a receiver, a wireless communication tester, a radio frequency signal processor, a filter, a radio frequency cable, a general interface bus (GPIB) cable, a anechoic chamber, a pre-amplifier, a measuring antenna, an antenna tower, an antenna cable, a testing turntable, a wireless communication tester antenna and a pre-buried cable; wherein,
the pre-amplifier, the measuring antenna, the antenna tower, the testing rotary table and the wireless communication tester antenna are arranged in the anechoic chamber; the embedded cable is embedded in the wall of the anechoic chamber or below the ground;
the test rotary table is used for bearing intelligent substation equipment and can drive the intelligent substation equipment to rotate in a horizontal plane;
the wireless communication tester antenna is arranged below the test turntable;
the measuring antenna is fixedly arranged on the antenna tower and is connected with the pre-amplifier through the antenna cable;
the antenna tower is arranged at a set distance from the testing rotary table and can drive the measuring antenna to move up and down along the vertical direction;
the radio frequency signal processor is respectively connected with the signal source, the receiver, the wireless communication tester and the filter through the radio frequency cable; the pre-amplifier and the wireless communication tester antenna are respectively connected through the pre-buried cable;
and the control equipment is respectively connected with the signal source, the receiver, the wireless communication tester, the radio frequency signal processor and the filter through the GPIB cable.
With the aid of the above technical scheme, the utility model provides a radiation emission test system, this system can carry out the electromagnetic compatibility test to wireless communication equipment and non-wireless communication equipment, and this system provides and utilizes the extension uncertainty to carry out the function revised to the test result, can improve the accuracy and the reliability of final test result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a radiation emission testing system provided by the present invention;
fig. 2 is a schematic flow chart of the work flow of the radiation emission testing system provided by the present invention.
Detailed Description
The technical solutions in the embodiments of 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a radiation emission test system, as shown in figure 1, this system includes: the system comprises a control device 101, a signal source 102, a receiver 103, a wireless communication tester 104, a radio frequency signal processor 105, a filter 106, a radio frequency cable 107, a GPIB cable 108, an anechoic chamber 109, a pre-amplifier 110, a measuring antenna 111, an antenna tower 112, an antenna cable 113, a testing turntable 114, a wireless communication tester antenna 115 and a pre-buried cable 116; wherein, the receiver 103 is composed of a frequency spectrograph 117 and a preselector 118; the anechoic chamber 109 is a semi-anechoic chamber or a full-anechoic chamber; the antenna tower 112 is arranged at a distance of 3 meters or 10 meters from the testing turntable 114 so as to meet the requirement of testing different frequency bands of the intelligent substation equipment.
As shown in fig. 1, a pre-amplifier 110, a measuring antenna 111, an antenna tower 112, a testing turntable 114, and a wireless communication tester antenna 115 are disposed in an anechoic chamber 109; the embedded cable 116 is embedded in the wall of the anechoic chamber 109 or below the ground;
the test rotary table 114 is used for bearing the intelligent substation equipment and driving the intelligent substation equipment to rotate in a horizontal plane;
a wireless communication tester antenna 115 disposed below the test turret 114;
a measuring antenna 111 fixedly arranged on an antenna tower 112 and connected with the pre-amplifier 110 through an antenna cable 113;
an antenna tower 112, which is arranged at a set distance from the testing turntable 114 and can drive the measuring antenna 111 to move up and down along the vertical direction;
a radio frequency signal processor 105 connected to the signal source 102, the receiver 103, the wireless communication tester 104 and the filter 106 through a radio frequency cable 107; the pre-amplifier 110 and the wireless communication tester antenna 115 are respectively connected through a pre-buried cable 116;
the control device 101 is connected to the signal source 102, the receiver 103, the wireless communication tester 104, the radio frequency signal processor 105 and the filter 106 through the GPIB cable 108.
In the present invention, the signal source 102 is mainly used for calibrating the path, i.e. measuring the attenuation of the path to different frequency signals.
The function of the rf signal processor 105 is to implement automatic switching of various measurement paths.
The wireless communication tester 104 is a base station installed outdoors by a wireless communication carrier.
The filter 106 functions to filter out a carrier frequency signal with a relatively high power, on one hand, to prevent the mixer of the spectrometer from being burned out by the carrier frequency signal, and on the other hand, after the carrier frequency signal is filtered out, the internal attenuation of the spectrometer can be minimized, so as to reduce the noise floor and increase the dynamic range of measurement.
The measuring antenna 111 is used for receiving radiation disturbance and acts as a sensor for converting the disturbance field strength into a disturbance voltage.
The wireless communication tester antenna 115 is fixedly placed right below the test turret 114 and does not rotate with the rotation of the test turret 114.
Considering that the noise floor of a frequency point above 1031GHz of the receiver is relatively high, and the margin between the field intensity of a part of high-frequency points converted to the antenna measuring point and the disturbance limit value is small, the preamplifier 110 is required to be accessed to the front end of the measuring path for amplification and compensation.
The control device 101 is a control center of the system, and realizes control of the instruments and devices and reading, analysis, judgment and output of reports of measurement data through the control software loaded on the control device.
When performing an electromagnetic compatibility test on a non-wireless communication device, the wireless communication tester 104, the wireless communication tester antenna 115, and the filter 106 may be turned off and not used because a wireless communication connection is not required.
As shown in fig. 2, the working principle and the flow of the radiation testing system provided by the utility model are as follows:
and step S1, testing to obtain the radiation disturbance limit value of the intelligent substation equipment.
The step can be divided into two steps of pre-scanning and final testing:
step S11, pre-scanning is to quickly search the maximum emission frequency point of the radiation disturbance of the intelligent substation equipment by adopting a Peak (PK) limit detection mode. In the process, the antenna tower carries the measuring antenna to move up and down from 1m to 4m, and the testing turntable carries the intelligent substation equipment to rotate to different directions (generally within a range of 360 degrees, such as-180 degrees to +180 degrees) relative to the measuring antenna.
And step S12, final test is to select a plurality of (usually 6) maximum emission frequency points from the pre-scanned data, then test is carried out on the frequency points, and the test is carried out according to the detection mode (quasi-peak limit value or average value limit value) identified in the limit values during final test to obtain the radiation disturbance limit value of the intelligent substation equipment. In this step, since the measurement sites of the frequency bands below 1GHz and the frequency bands above 1GHz are different, and the positions of the toggle switch of the pre-amplifier in the two frequency bands are also different (the path losses are different), the measurement of the two frequency bands needs to be performed separately, that is, as two measurements.
Step S2, revising the radiation disturbance limit value obtained by the test of step S1 by using the expansion uncertainty of the radiation emission test system, wherein in the step, the expansion uncertainty of the radiation emission test system is calculated according to the following formula:
wherein n is the total number of uncertainty source components of the radiation emission test system; ci is the sensitivity coefficient of the ith uncertainty source component; ui is the uncertainty of the ith uncertainty source component; u (E) is the extended uncertainty of the radiation emission test system; k is an inclusion factor.
The extended uncertainty of the radiation emission test system utilized in step S2 is determined as follows:
step S21, analyzing sources of uncertainty of the radiation emission test system, comprising: the parameters of the main test equipment and the arrangement of the instrument equipment.
In step S22, the uncertainty component caused by the parameters of the primary test equipment includes: voltage reading of a frequency spectrograph, attenuation of a connection network between the frequency spectrograph and a measuring antenna, a measuring antenna coefficient, uncertainty introduced by measuring antenna factors along with height change, uncertainty introduced by measuring antenna phase center position, uncertainty introduced by measuring antenna coefficient frequency interpolation, uncertainty introduced by measuring antenna imbalance, and influence of measuring antenna cross polarization.
In step S23, the uncertainty component caused by the arrangement of the instrument device includes: the uncertainty introduced by the distance measurement inaccuracy between the measuring antenna and the intelligent substation equipment, the uncertainty introduced by the improper height of the testing rotary table from the ground, and the uncertainty introduced by the mismatch error between the output end of the measuring antenna and the input end of the receiver.
Step S24, establishing a mathematical model of the electric field radiation intensity of the radiation emission testing system based on the uncertainty component.
E=Vr+Lc+AF+δVsw+δVPa+δVPr+δVnf+δM+δAFf
+δAFh+δAdir+δAph+δAcp+δAbal+δSA+δd+δh
Wherein Vr is the receiver voltage reading, dB [ mu ] V;
lc is the attenuation, dB, of the connection network between the receiver and the measurement antenna;
AF is the coefficient of the measuring antenna, dB/m;
δ Vsw is a corrected value, dB, of the sine wave voltage of the receiver, which is inaccurate;
δ VPa is a corrected value, dB, for which the receiver pulse amplitude response is not ideal;
δ VPr is a correction value, dB, for which the receiver pulse repetition frequency response is not ideal;
δ Vnf is a correction value, dB, of the local noise influence of the receiver;
δ M is the correction value of mismatch error, dB;
δ AFf is the correction value, dB, for the interpolation error of the measurement antenna coefficient;
δ AFh is a correction value, dB, for measuring the difference between the antenna coefficient varying with height and the antenna coefficient varying with height of a standard dipole antenna;
delta Adir is a corrected value, dB, for measuring the antenna directivity;
delta Aph is a corrected value, dB, of the phase center position of the measured antenna;
delta Acp is a corrected value, dB, for measuring the cross polarization response of the antenna;
δ Abal is a correction value, dB, for measuring the imbalance of the antenna;
δ SA is the corrected value of imperfect site attenuation, dB;
δ d is a corrected value of inaccurate measurement of the distance between the measuring antenna and the measured piece, dB;
δ h is a corrected value, dB, for the testing turntable at an improper height from the ground.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Those of skill in the art will also appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The various illustrative logical blocks, or elements, or devices described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a user terminal. In the alternative, the processor and the storage medium may reside in different components in a user terminal.
In one or more exemplary designs, the functions described above in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media that facilitate transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store program code in the form of instructions or data structures and which can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Additionally, any connection is properly termed a computer-readable medium, and, thus, is included if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wirelessly, e.g., infrared, radio, and microwave. Such discs (disk) and disks (disc) include compact disks, laser disks, optical disks, DVDs, floppy disks and blu-ray disks where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included in the computer-readable medium.
Claims (4)
1. A radiation emission testing system, comprising: the device comprises control equipment, a signal source, a receiver, a wireless communication tester, a radio frequency signal processor, a filter, a radio frequency cable, a general interface bus (GPIB) cable, a anechoic chamber, a pre-amplifier, a measuring antenna, an antenna tower, an antenna cable, a testing turntable, a wireless communication tester antenna and a pre-buried cable; wherein,
the pre-amplifier, the measuring antenna, the antenna tower, the testing rotary table and the wireless communication tester antenna are arranged in the anechoic chamber; the embedded cable is embedded in the wall of the anechoic chamber or below the ground;
the test rotary table is used for bearing intelligent substation equipment and can drive the intelligent substation equipment to rotate in a horizontal plane;
the wireless communication tester antenna is arranged below the test turntable;
the measuring antenna is fixedly arranged on the antenna tower and is connected with the pre-amplifier through the antenna cable;
the antenna tower is arranged at a set distance from the testing rotary table and can drive the measuring antenna to move up and down along the vertical direction;
the radio frequency signal processor is respectively connected with the signal source, the receiver, the wireless communication tester and the filter through the radio frequency cable; the pre-amplifier and the wireless communication tester antenna are respectively connected through the pre-buried cable;
and the control equipment is respectively connected with the signal source, the receiver, the wireless communication tester, the radio frequency signal processor and the filter through the GPIB cable.
2. The radiated emission test system recited in claim 1 wherein the receiver is comprised of a spectrometer and a pre-selector.
3. The radiation emission testing system of claim 1, wherein the anechoic chamber is a semi-anechoic chamber or a full anechoic chamber.
4. The radiation emission testing system of claim 1, wherein the antenna tower is positioned 3 or 10 meters from the testing turret.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616575A (en) * | 2013-09-05 | 2014-03-05 | 国家电网公司 | Radiation emission test system and radiation emission test method |
| CN106872801A (en) * | 2017-04-02 | 2017-06-20 | 深圳市通用测试系统有限公司 | A kind of near field test system |
| CN107015068A (en) * | 2017-05-15 | 2017-08-04 | 广州视源电子科技股份有限公司 | EMC quasi-peak value testing method and device |
| CN109039832A (en) * | 2018-09-29 | 2018-12-18 | 安徽众家云物联网科技有限公司 | A kind of intelligent appliance communication reliability test method |
| CN109859428A (en) * | 2019-03-12 | 2019-06-07 | 上海荷福人工智能科技（集团）有限公司 | A kind of comprehensive theft management method and system based on artificial intelligence |
| CN110514907A (en) * | 2018-05-21 | 2019-11-29 | 川升股份有限公司 | Wireless communication device air transmission measurement system |
| CN111342198A (en) * | 2020-03-17 | 2020-06-26 | 珠海微度芯创科技有限责任公司 | Wireless feed system for antenna measurement |
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- 2013-09-05 CN CN201320550537.6U patent/CN203422434U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103616575A (en) * | 2013-09-05 | 2014-03-05 | 国家电网公司 | Radiation emission test system and radiation emission test method |
| CN106872801A (en) * | 2017-04-02 | 2017-06-20 | 深圳市通用测试系统有限公司 | A kind of near field test system |
| CN106872801B (en) * | 2017-04-02 | 2024-04-30 | 深圳市通用测试系统有限公司 | Near field test system |
| CN107015068A (en) * | 2017-05-15 | 2017-08-04 | 广州视源电子科技股份有限公司 | EMC quasi-peak value testing method and device |
| CN107015068B (en) * | 2017-05-15 | 2019-10-29 | 广州视源电子科技股份有限公司 | EMC quasi-peak value testing method and device |
| CN110514907A (en) * | 2018-05-21 | 2019-11-29 | 川升股份有限公司 | Wireless communication device air transmission measurement system |
| CN110514907B (en) * | 2018-05-21 | 2021-11-09 | 川升股份有限公司 | Air transmission measuring system for wireless communication device |
| CN109039832A (en) * | 2018-09-29 | 2018-12-18 | 安徽众家云物联网科技有限公司 | A kind of intelligent appliance communication reliability test method |
| CN109039832B (en) * | 2018-09-29 | 2022-04-15 | 安徽众家云物联网科技有限公司 | Intelligent household electrical appliance communication reliability testing method |
| CN109859428A (en) * | 2019-03-12 | 2019-06-07 | 上海荷福人工智能科技（集团）有限公司 | A kind of comprehensive theft management method and system based on artificial intelligence |
| CN109859428B (en) * | 2019-03-12 | 2020-07-28 | 上海荷福人工智能科技（集团）有限公司 | Artificial intelligence-based comprehensive anti-theft management method and system |
| CN111342198A (en) * | 2020-03-17 | 2020-06-26 | 珠海微度芯创科技有限责任公司 | Wireless feed system for antenna measurement |
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Granted publication date: 20140205 |