CN210534315U - Ultrahigh frequency electromagnetic interference simulation system - Google Patents
Ultrahigh frequency electromagnetic interference simulation system Download PDFInfo
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- CN210534315U CN210534315U CN201920044922.0U CN201920044922U CN210534315U CN 210534315 U CN210534315 U CN 210534315U CN 201920044922 U CN201920044922 U CN 201920044922U CN 210534315 U CN210534315 U CN 210534315U
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Abstract
The utility model relates to a superfrequency electromagnetic interference analog system. The method is characterized in that: the control system is connected with the signal conduction coupling unit sequentially through a communication electromagnetic interference signal transmitting unit, a first program control attenuation unit and a first power amplification unit, and the signal conduction coupling unit is also connected with the signal radiation unit; the control system is also connected with the signal conduction coupling unit sequentially through an analog partial discharge type electromagnetic interference signal transmitting unit, a second program control attenuation unit and a second power amplification unit. Compared with the prior art, the utility model discloses the advantage of system lies in: and establishing an interference signal library through various typical electromagnetic interference data tested in the field.
Description
Technical Field
The utility model relates to a superfrequency electromagnetic interference analog system.
Background
With the increasingly wide application of the partial discharge state detection technology, the problems of the partial discharge detection equipment are gradually revealed. Due to the complex electromagnetic interference environment of the transformer substation, the technology for detecting and monitoring electromagnetic interference also meets the technical development bottleneck, the missed alarm and the false alarm are serious problems commonly exposed by the existing partial discharge state detection equipment, and authoritative statistics shows that more than 90% of alarms are false alarms, and the basis of the false alarms lies in the interference identification capability and the anti-interference level of the current state detection product, so that the electromagnetic interference environment of the transformer substation on site cannot be adapted to the complex electromagnetic environment. How to suppress these complex interference signals overlapping with the partial discharge signal in frequency band and improve the detection sensitivity is a bottleneck in field application of the state detection technology. Therefore, the calibration work for the anti-interference capability and the interference identification capability of the state detection product is particularly important.
The measured data of the partial discharge online and offline monitoring and detecting equipment is used as an important index for judging the operation condition of the primary equipment, the correctness of the measured data directly influences the correctness of the operation condition of the primary equipment, if the primary equipment has a partial discharge problem, the online monitoring equipment cannot find or the precision of the monitored data is low, so that the technical personnel cannot pay attention to the partial discharge problem, and the small hidden danger of the primary equipment is often developed into an accident of the primary equipment; the problem of partial discharge does not exist in primary equipment, abnormal data frequently occur in the online monitoring equipment, and technical personnel are misled to carry out unnecessary power failure maintenance, so that the waste of manpower, material resources and financial resources is caused, and the stability and the reliability of the operation of a power grid are influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a superfrequency electromagnetic interference analog system, the system has realized multisource discharge interference simulation and electromagnetic interference signal multiple spot overall arrangement, can put detection device to the superfrequency office of different producers and carry out anti-interference ability and discharge pattern recognition function and check-up.
An ultrahigh frequency electromagnetic interference simulation system is characterized in that: the control system is connected with the signal conduction coupling unit sequentially through a communication electromagnetic interference signal transmitting unit, a first program control attenuation unit and a first power amplification unit, and the signal conduction coupling unit is also connected with the signal radiation unit; the control system is also connected with the signal conduction coupling unit sequentially through an analog partial discharge type electromagnetic interference signal transmitting unit, a second program control attenuation unit and a second power amplification unit.
The control system is used for controlling and displaying typical analog interference signals output by the signal transmitting unit, and the signal types specifically comprise free metal particle type interference analog signals, floating potential body type interference analog signals, along surface type interference analog signals, insulating part inner air gap type interference analog signals or metal tip type interference analog signals.
Wherein the programmable attenuation unit specifically adopts a programmable attenuator.
The power amplification unit specifically adopts a radio frequency power amplifier.
Wherein the signal radiation unit specifically adopts an omnidirectional ultrahigh frequency sensor.
Compared with the prior art, the utility model discloses the advantage of system lies in: and establishing an interference signal library through various typical electromagnetic interference data tested in the field. The controller calls the packet sequence pulse signals and spectrogram data containing phase information in the interference library, corresponding characteristics of the signals such as amplitude, frequency spectrum, various statistical spectrograms and the like are obtained through analysis, and corresponding control instructions are sent to adjust the generation of the signals of the signal generation unit.
Drawings
FIG. 1 is a logic diagram of the present invention;
fig. 2 is a schematic block diagram of the digital up-conversion discharge signal generation of the present invention.
Detailed Description
The utility model discloses an electromagnetic interference signal to the transformer substation scene has developed deep test research, through a large amount of test analysis on-the-spot interference signal's characteristic, source, combines the site characteristics to carry out the laboratory and reappears. The utility model discloses a superfrequency electromagnetic interference analog system and method not only can simulate out various types office and put electromagnetic interference signal, can also reproduce the office of different stages of discharging simultaneously and put interference signal. The detection items of the laboratory partial discharge verification system are effectively filled, and the evaluation and verification of the anti-interference performance and the effectiveness of the partial discharge detection device are realized.
The system of the utility model mainly comprises a control system, which is initialized by SPARTN-6 chip of XILINX company and configured with radio frequency parameters. The control system is sequentially controlled by an SIM800C GSM chip through an AT instruction by a communication electromagnetic interference signal transmitting unit, the working frequency range covers 850/900/1800/1900MHz, a first program control attenuation unit TAT-040G27-63VD7 and a first power amplification unit TPA-008025G03B are connected with a signal conduction coupling unit ZCLMR240DB, and the signal conduction coupling unit is also connected with a signal radiation unit AVTSEN-3; the control system is also connected with the signal conduction coupling unit through a radio frequency chip AD9364 produced by ADI company, a second program control attenuation unit and a second power amplification unit in sequence by an analog partial discharge type electromagnetic interference signal transmitting unit.
Example 1:
the utility model provides a superfrequency electromagnetic interference analog system specifically as follows:
a. and generating a signal, wherein a control system is a central pivot of the whole electromagnetic interference simulation device and controls the work of the whole platform. And establishing an interference signal library through various typical electromagnetic interference data tested in the field. The sequence pulse signals and spectrogram data containing phase information in the interference library can be called through the controller, corresponding characteristics of the signals such as amplitude, frequency spectrum, various statistical spectrograms and the like are obtained through analysis, and corresponding control instructions are sent to adjust the generation of signals of the signal generation unit;
b. the communication type electromagnetic interference signal transmitting unit is characterized in that communication signals mainly come from radiation of a mobile phone communication base station, the platform can simulate a typical GSM900/1800MHz mobile phone communication frequency band, the maximum range of the communication signals is set for the communication signal generating unit according to the amplitude range of the substation communication signals counted by field test, a mobile phone core circuit board is adopted, and required peripheral circuits are arranged outside the circuit board;
c. the simulation partial discharge type electromagnetic interference signal transmitting unit is a core function unit of the platform. Corona discharge on a high-voltage conductor in a transformer substation, various discharge at the end part and the surface of a wire outlet sleeve of various high-voltage equipment, various interference pulses on an equipment grounding network and the like are pulse type signals which are very similar to partial discharge signals, are difficult to identify, have the largest interference on partial discharge detection, and are the most important part for checking whether field monitoring equipment works normally or not. For the simulation of typical defect discharge interference, the simulation is realized by adopting a mode of any signal generator, mixer and power amplifier.
The signal transmitting unit contains waveform editing and generating software, and the required arbitrary waveform is obtained through calculation according to various characteristics of signals transmitted by the upper computer and actual waveform data. Because the signal frequency output capability of the signal transmitting unit is only dozens of MHz to hundreds of MHz, and the frequency spectrum of the discharge interference signal is generally above 300MHz, and some interference signals even reach up to GHz, a mixer must be added because the signal generator and the power amplifier cannot complete the corresponding functions.
d. And the program-controlled attenuation unit is used for adjusting the amplitude of the signal output by the analog signal transmitting unit within a certain range, and is connected with the program-controlled attenuation unit at the rear end of the transmitting unit in order to realize controllability and adjustability of the signal of the transmitting unit, so that the increase or reduction of the output power of the signal can be realized. The control precision of the program control attenuation unit is 0.5dB, and the adjustment function can be realized through software program design.
e. The power amplification unit is used for performing power amplification on the signals output by the analog signal transmission unit, transmitting the signals to a space through the radiation unit and covering an effective distance.
f. For the output of the ultrahigh frequency electromagnetic interference signals, the radio frequency cable and the ultrahigh frequency radiation antenna are adopted to radiate the signals into the space.
The utility model discloses a superfrequency electromagnetic interference signal analog system can adopt two kinds of reproduction modes, and the one of which utilizes control system configuration electromagnetic interference signal analog device for reproducing the electromagnetic interference signal based on the GTEM cell, with signal injection GTEM cell in, will be arranged in GTEM cell coupling window by the partial discharge tester sensor of being detected, control electromagnetic interference signal analog device input different discharge type analog signal. The system can verify the discharge mode recognition function of the partial discharge tester, and the inspection detector can accurately recognize typical discharge types such as free metal particle discharge, suspension potential body discharge, creeping discharge, air gap discharge in an insulating part, metal point discharge and the like.
The ultrahigh frequency electromagnetic interference signal simulation system can also utilize a GIS (geographic information System) to simulate interference discharge signal reproduction, a control system is utilized to configure a multi-channel electromagnetic interference signal simulation device to output partial discharge simulation signals of different discharge types, the signals are respectively injected into a built-in sensor of a typical GIS structure through radio frequency coaxial transmission lines, a partial discharge detector is also connected onto the built-in sensor of the GIS structure, and the partial discharge simulation signals generate discharge electric field signals in a GIS cavity. The method can be used for verifying the effectiveness and the anti-interference capability of the partial discharge detection device.
Example 2:
a very high frequency electromagnetic interference analog system based on mixing technology: the system comprises a control system, a communication type electromagnetic interference signal transmitting unit, a simulation partial discharge type electromagnetic interference signal transmitting unit, a program control attenuation unit, a power amplification unit, a signal conduction coupling unit and a signal radiation unit, wherein the system is sequentially connected with the simulation electromagnetic interference signal transmitting unit, the program control attenuation unit, the power amplification unit, the signal conduction coupling unit and the signal radiation unit for the control system from front to back.
The control system is used for controlling and displaying the signal transmitting unit to output a typical analog interference signal, and the signal types comprise: free metal particle interference analog signals, suspension potential body interference analog signals, surface interference analog signals, air gap interference analog signals in the insulating part, metal tip interference analog signals and the like;
the electromagnetic interference signal transmitting unit comprises a communication type electromagnetic interference signal transmitting unit and an analog partial discharge type electromagnetic interference signal transmitting unit, and is used for generating different types of analog electromagnetic interference signals from original data with certain amplitude, phase, frequency, sampling rate and other information;
the programmable attenuation unit is a programmable attenuator and is used for adjusting the amplitude of the signal output by the analog signal transmitting unit within a certain range;
the power amplification unit is a radio frequency power amplifier and is used for performing power amplification on the signal output by the analog signal transmission unit, transmitting the signal to a space through the radiation unit and covering an effective distance;
the signal radiation unit is usually an omnidirectional ultrahigh frequency sensor, and is used for radiating electromagnetic interference signals generated by the analog signal transmission unit to the surrounding space after being adjusted by the programmable attenuator and amplified by the power amplification unit, wherein the signal coverage range is within 10 meters.
The signal conduction coupling unit is used for transmitting the signal generated by the analog signal transmitting unit to the signal radiating unit.
Claims (5)
1. An ultrahigh frequency electromagnetic interference simulation system, characterized by: the control system is connected with the signal conduction coupling unit sequentially through a communication electromagnetic interference signal transmitting unit, a first program control attenuation unit and a first power amplification unit, and the signal conduction coupling unit is also connected with the signal radiation unit; the control system is also connected with the signal conduction coupling unit sequentially through an analog partial discharge type electromagnetic interference signal transmitting unit, a second program control attenuation unit and a second power amplification unit.
2. The uhf electromagnetic interference simulation system of claim 1, wherein: the control system is used for controlling and displaying typical analog interference signals output by the signal transmitting unit, and the signal types specifically comprise free metal particle type interference analog signals, floating potential body type interference analog signals, along surface type interference analog signals, insulating part inner air gap type interference analog signals or metal tip type interference analog signals.
3. The uhf electromagnetic interference simulation system of claim 1, wherein: wherein the programmable attenuation unit specifically adopts a programmable attenuator.
4. The uhf electromagnetic interference simulation system of claim 1, wherein: the power amplification unit specifically adopts a radio frequency power amplifier.
5. The uhf electromagnetic interference simulation system of claim 1, wherein: wherein the signal radiation unit specifically adopts an omnidirectional ultrahigh frequency sensor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109541515A (en) * | 2019-01-11 | 2019-03-29 | 国网宁夏电力有限公司电力科学研究院 | Superfrequency electromagnetic interference simulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109541515A (en) * | 2019-01-11 | 2019-03-29 | 国网宁夏电力有限公司电力科学研究院 | Superfrequency electromagnetic interference simulation system |
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