CN116359680A - Partial discharge detection superheterodyne receiver design based on UHF sweep frequency - Google Patents
Partial discharge detection superheterodyne receiver design based on UHF sweep frequency Download PDFInfo
- Publication number
- CN116359680A CN116359680A CN202310073477.1A CN202310073477A CN116359680A CN 116359680 A CN116359680 A CN 116359680A CN 202310073477 A CN202310073477 A CN 202310073477A CN 116359680 A CN116359680 A CN 116359680A
- Authority
- CN
- China
- Prior art keywords
- frequency
- electrically connected
- bandwidth
- partial discharge
- uhf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Superheterodyne Receivers (AREA)
Abstract
Description
技术领域technical field
本发明属于超外差接收机技术领域，具体涉及基于UHF扫频的局部放电检测超外差接收机设计。The invention belongs to the technical field of superheterodyne receivers, in particular to the design of superheterodyne receivers for partial discharge detection based on UHF frequency sweep.
背景技术Background technique
变电站中的变压器和GIS组合电器{以下简称“GIS”)在运行过程中发生绝缘故障产生局部放电时，所激发的电磁波信号频谱高达3GHz，其主要能量集中在500～1500MHz；通过检测变压器和GIS局部放电过程向外辐射的特高频脉冲电磁波，借助计算机和信号处理技术来诊断确定变压器和GIS的绝缘故障是目前电力系统广泛应用的检测方法。特高频局部放电检测技术具有高灵敏度、高准确度以及较强的抗干扰性能，既能实现局部放电信号的检测，同时能实现故障类型的识别，甚至是故障定位。When the transformer and GIS combined electrical appliance in the substation (hereinafter referred to as "GIS") generates partial discharge due to an insulation fault during operation, the spectrum of the excited electromagnetic wave signal is as high as 3GHz, and its main energy is concentrated at 500-1500MHz; by detecting the transformer and GIS The ultra-high frequency pulsed electromagnetic waves radiated outward during the partial discharge process, and the diagnosis and determination of the insulation faults of transformers and GIS with the help of computer and signal processing technology are currently widely used detection methods in power systems. UHF partial discharge detection technology has high sensitivity, high accuracy and strong anti-interference performance. It can not only realize the detection of partial discharge signals, but also realize the identification of fault types and even fault location.
变压器局部放电所激发的电磁波信号频谱很宽，高达3GHz，虽采用了500MHz～1500MHz的UHF天线降低了响应信号的带宽，但仍然有1GHz的带宽，最高频率为1500MHz，为检测局部放电的特高频特性，需要在工频周期内获取特高频信号的相位分布和幅值信息，直接采集频率如此之高的特高频信号的ADC价格昂贵且进口受到限制；而且对这样大的采样数据量进行实时处理，对数据采集系统软硬件性能要求都很高。在500MHz～1500MHz频段上，还存在移动通信、电视、雷达等电磁波信号的强干扰，需要滤除这些固定频段的电磁波干扰信号。The spectrum of the electromagnetic wave signal excited by the partial discharge of the transformer is very wide, up to 3GHz. Although the UHF antenna of 500MHz~1500MHz is used to reduce the bandwidth of the response signal, it still has a bandwidth of 1GHz, and the highest frequency is 1500MHz. frequency characteristics, it is necessary to obtain the phase distribution and amplitude information of the UHF signal in the power frequency cycle, and the ADC for directly collecting UHF signals with such a high frequency is expensive and the import is restricted; and for such a large amount of sampled data For real-time processing, the performance requirements of the software and hardware of the data acquisition system are very high. In the 500MHz ~ 1500MHz frequency band, there is also strong interference from electromagnetic wave signals such as mobile communications, television, and radar, and it is necessary to filter out these electromagnetic wave interference signals in fixed frequency bands.
发明内容Contents of the invention
本发明的目的在于提供基于UHF扫频的局部放电检测超外差接收机设计，以解决上述背景技术中提出的问题。The purpose of the present invention is to provide a superheterodyne receiver design for partial discharge detection based on UHF frequency sweep, so as to solve the problems raised in the above-mentioned background technology.
为实现上述目的，本发明提供如下技术方案：基于UHF扫频的局部放电检测超外差接收机设计，包括用于变频时境频干扰抑制的频段选择滤波器；In order to achieve the above object, the present invention provides the following technical solutions: the design of a superheterodyne receiver for partial discharge detection based on UHF frequency sweep, including a frequency band selection filter for suppressing environmental frequency interference during frequency conversion;
所述频段选择滤波器电性连接有用于小能量电磁信号的低噪声放大器，所述低噪声放大器电性连接有变频单元一，且变频单元一电性连接有带宽及增益控制单元一，所述带宽及增益控制单元一电性连接有变频单元二，且变频单元二电性连接带宽及增益控制单元二，所述增益控制单元二电性连接有检波器。The frequency band selection filter is electrically connected with a low-noise amplifier for small-energy electromagnetic signals, the low-noise amplifier is electrically connected with a frequency conversion unit 1, and the frequency conversion unit 1 is electrically connected with a bandwidth and gain control unit 1, the The first bandwidth and gain control unit is electrically connected to the second frequency conversion unit, and the second frequency conversion unit is electrically connected to the second bandwidth and gain control unit, and the second gain control unit is electrically connected to the wave detector.
优选的，所述变频单元一包括一级混频器，所述一级混频器电性连接于低噪声放大器，且一级混频器电性连接有本振一，所述本振一电性连接有微处理器。Preferably, the frequency conversion unit 1 includes a first-stage mixer, the first-stage mixer is electrically connected to a low-noise amplifier, and the first-stage mixer is electrically connected to a local oscillator 1, and the local oscillator 1 is electrically Connectivity has a microprocessor.
优选的，所述带宽及增益控制单元一包括带通滤波器一，所述带通滤波器一电性连接于一级混频器，且带通滤波器一电性连接有中频放大器一。Preferably, the bandwidth and gain control unit 1 includes a band-pass filter 1 , the band-pass filter 1 is electrically connected to the first-stage mixer, and the band-pass filter 1 is electrically connected to the intermediate frequency amplifier 1 .
优选的，所述变频单元二包括二级混频器，所述二级混频器电性连接于中频放大器一，且二级混频器还电性连接有本振二。Preferably, the second frequency conversion unit includes a second-stage mixer, the second-stage mixer is electrically connected to the first intermediate frequency amplifier, and the second-stage mixer is also electrically connected to the second local oscillator.
优选的，所述带宽及增益控制单元二包括带通滤波器二，所述带通滤波器二电性连接于二级混频器，且带通滤波器二还电性连接有中频放大器二，所述中频放大器二电性连接于检波器。Preferably, the bandwidth and gain control unit 2 includes a bandpass filter 2, the bandpass filter 2 is electrically connected to the secondary mixer, and the bandpass filter 2 is also electrically connected to the intermediate frequency amplifier 2, The two intermediate frequency amplifiers are electrically connected to the wave detector.
本发明的技术效果和优点：该基于UHF扫频的局部放电检测超外差接收机设计，得益于变频单元一和变频单元二以及带宽及增益控制单元一和带宽及增益控制单元二的设置，其具有宽频带，大动态，高灵敏度的特点，能把宽带频谱变换为窄带模拟信号，用于提取局部放电信号的相位和幅值，从而大大降低数据采集系统的要求和数据量，达到既能检测信号又降低检测系统技术要求和成本的目的。可对移动通信、电视、雷达等频段固定的电磁波干扰信号能有效滤除。Technical effects and advantages of the present invention: the design of the superheterodyne receiver for partial discharge detection based on UHF frequency sweep benefits from the settings of frequency conversion unit 1 and frequency conversion unit 2 and bandwidth and gain control unit 1 and bandwidth and gain control unit 2 , which has the characteristics of wide frequency band, large dynamic range and high sensitivity. It can transform the wide band spectrum into narrow band analog signal, which can be used to extract the phase and amplitude of the partial discharge signal, thereby greatly reducing the requirements and data volume of the data acquisition system and achieving both The purpose of being able to detect signals and reduce the technical requirements and costs of the detection system. It can effectively filter out electromagnetic wave interference signals with fixed frequency bands such as mobile communication, TV, and radar.
附图说明Description of drawings
图1为本发明的设计方案图；Fig. 1 is a design scheme diagram of the present invention;
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明提供了如图1所示的基于UHF扫频的局部放电检测超外差接收机设计，包括用于变频时境频干扰抑制的频段选择滤波器，频段选择滤波器由一个LCL无源高通滤波器和一个无源低通滤波器组成，限制3dB输入频带为500～1500MHz，450～1650MHz以外频带抑制20dB以上，同时对输入端口进行接地保护，所述频段选择滤波器电性连接有用于小能量电磁信号的低噪声放大器，所述低噪声放大器电性连接有变频单元一，且变频单元一电性连接有带宽及增益控制单元一，所述带宽及增益控制单元一电性连接有变频单元二，且变频单元二电性连接带宽及增益控制单元二，所述增益控制单元二电性连接有检波器，检波器输入频带范围为100～2700MHz，输入动态范围为-60dBm～10dBm，输出带宽为6MHz，所述频段选择滤波器的目的是选择出所要测量频段的频率，把变频时的境频干扰抑制20dB以上，即把境频上的干扰能量隆低在百分之一以下。按理论分析，频段选择滤波器带宽应远低于第一中频频率，降低中频和半中频带来的干扰，而低噪声放大器的功能是为保证对较弱的局部放电带有小能量电磁信号的接收，整个接收前端变频外理电路应有尽可能高的接收灵敏度，在前级设计一低噪声放大电路以降低本级及后级变频、检波的噪声影响是提高灵敏度的主要措施。除低噪声要求外，还要有足够的电平动态范围。The present invention provides the design of superheterodyne receiver for partial discharge detection based on UHF frequency sweep as shown in Figure 1, including a frequency band selection filter for suppressing environmental frequency interference during frequency conversion, and the frequency band selection filter is composed of an LCL passive high-pass The filter is composed of a passive low-pass filter, which limits the 3dB input frequency band to 500-1500MHz, and suppresses the frequency bands other than 450-1650MHz by more than 20dB. At the same time, the input port is grounded. A low noise amplifier for energy electromagnetic signals, the low noise amplifier is electrically connected to a frequency conversion unit 1, and the frequency conversion unit 1 is electrically connected to a bandwidth and gain control unit 1, and the bandwidth and gain control unit 1 is electrically connected to a frequency conversion unit 2. The frequency conversion unit 2 is electrically connected to the bandwidth and the gain control unit 2. The gain control unit 2 is electrically connected to a detector. The detector has an input frequency range of 100-2700MHz, an input dynamic range of -60dBm to 10dBm, and an output bandwidth of It is 6MHz, and the purpose of the frequency band selection filter is to select the frequency of the frequency band to be measured, and suppress the boundary frequency interference during frequency conversion by more than 20dB, that is, lower the interference energy on the boundary frequency below 1%. According to theoretical analysis, the bandwidth of the frequency band selection filter should be much lower than the first intermediate frequency frequency to reduce the interference caused by the intermediate frequency and half intermediate frequency, and the function of the low noise amplifier is to ensure the weaker partial discharge electromagnetic signal with small energy For reception, the entire receiving front-end frequency conversion external processing circuit should have as high a receiving sensitivity as possible. Designing a low-noise amplifier circuit in the front stage to reduce the noise influence of the current stage and the subsequent stage frequency conversion and detection is the main measure to improve the sensitivity. In addition to low noise requirements, there must be sufficient level dynamic range.
具体的，所述变频单元一包括一级混频器，所述一级混频器电性连接于低噪声放大器，且一级混频器电性连接有本振一，所述本振一采用可编程频率合成器，并根据微处理器的控制输出系统设定的本振频率信号(2460～3460MHz)，输出功率0～2dBm，相位噪声小于-70dBc/Hz@1K，杂散小于-30dBc，-40～80℃温度范围频率稳定度小于10PPM，步进频率1MHz；Specifically, the frequency conversion unit 1 includes a first-stage mixer, the first-stage mixer is electrically connected to a low-noise amplifier, and the first-stage mixer is electrically connected to a local oscillator 1, and the local oscillator 1 adopts Programmable frequency synthesizer, and output system-set local oscillator frequency signal (2460~3460MHz) according to the control of the microprocessor, output power 0~2dBm, phase noise less than -70dBc/Hz@1K, spurious less than -30dBc, -40～80℃ temperature range frequency stability is less than 10PPM, step frequency 1MHz;
所述本振一电性连接有微处理器，所述微处理器采用8051单片机，根据系统设置参数，通过SPI接口完成本振1(可编程频率合成器)的输出频率设定；通过调整本振1输出频率(2460～3460MHz)在500～1500MHz输入频带内以20MHz带宽进行无缝步进扫频，检索局部放电信号，所述带宽及增益控制单元一包括带通滤波器一，所述带通滤波器一电性连接于一级混频器，且带通滤波器一电性连接有中频放大器一，所述变频单元二包括二级混频器，所述二级混频器电性连接于中频放大器一，且二级混频器还电性连接有本振二，所述本振二采用定点频率源，输出2100MHz的本振频率信号，输出功率2dBm，相位噪声小于-75dBc/Hz@1K，-40～80℃温度范围频率稳定度小于10PPM；Described local oscillator one is electrically connected with microprocessor, and described microprocessor adopts 8051 single-chip microcomputer, according to system setting parameter, completes the output frequency setting of local oscillator 1 (programmable frequency synthesizer) by SPI interface; Vibrator 1 output frequency (2460-3460MHz) performs seamless step-by-step frequency sweep with 20MHz bandwidth within 500-1500MHz input frequency band to retrieve partial discharge signal, the bandwidth and gain control unit one includes a band-pass filter one, the band The pass filter one is electrically connected to the first-stage mixer, and the band-pass filter one is electrically connected to the intermediate frequency amplifier one, and the frequency conversion unit two includes a two-stage mixer, and the two-stage mixer is electrically connected to The IF amplifier 1 and the secondary mixer are also electrically connected to the local oscillator 2. The local oscillator 2 uses a fixed-point frequency source to output a local oscillator frequency signal of 2100MHz, the output power is 2dBm, and the phase noise is less than -75dBc/Hz@ 1K, -40～80℃ temperature range frequency stability is less than 10PPM;
所述带宽及增益控制单元二包括带通滤波器二，所述带通滤波器一和带通滤波器二采用声表面滤波器，具有工作频率高、通频带宽、选频特性好等特点；带通滤波器一的3dB带宽为1930～1990MHz，1850～2040MHz以外频带抑制30dB以上；带通滤波器二在带宽为130～150MHz时插入损耗为9.3dB，128～152MHz以外频带抑制35dB以上；The bandwidth and gain control unit 2 includes a band-pass filter 2, and the band-pass filter 1 and the band-pass filter 2 adopt surface acoustic filters, which have the characteristics of high operating frequency, wide pass-frequency bandwidth, and good frequency selection characteristics; Band-pass filter 1 has a 3dB bandwidth of 1930-1990MHz, and suppresses frequency bands other than 1850-2040MHz by more than 30dB; band-pass filter 2 has an insertion loss of 9.3dB when the bandwidth is 130-150MHz, and suppresses frequency bands other than 128-152MHz by more than 35dB;
所述带通滤波器二电性连接于二级混频器，所述一级混频器和二级混频器采用无源宽带混频器，L0/RF输入频率范围5～3500MHz，IF输出频率范围5～2500MHz，转换损耗为7.9dB；采用差式混频，输出中频等于本振频率与输入信号频率之差；本设计的一级中频输出1960MHz信号等于本振1频率(2460～3460MHz)减去输入信号频率(500～1500MHz)，而另一个满足一级中频输出1960MHz信号条件的输入信号频率远在4.4GHz频段之外，已被频段选择滤波器抑制掉；二级中频输出140MHz信号等于本振2频率(2100MHz)减去1960MHz中频信号频率，而另一个满足二级中频输出140MHz信号条件的一级中频信号频率在2240MHz频段之外，已被带通滤波器一抑制掉；The two bandpass filters are electrically connected to the secondary mixer, the primary mixer and the secondary mixer are passive broadband mixers, the L0/RF input frequency range is 5-3500MHz, and the IF output The frequency range is 5-2500MHz, and the conversion loss is 7.9dB; using differential mixing, the output intermediate frequency is equal to the difference between the local oscillator frequency and the input signal frequency; the first-level intermediate frequency output signal of this design is equal to the local oscillator 1 frequency (2460-3460MHz). Subtract the input signal frequency (500~1500MHz), and another input signal frequency that satisfies the condition of the primary intermediate frequency output 1960MHz signal is far outside the 4.4GHz frequency band, and has been suppressed by the frequency band selection filter; the secondary intermediate frequency output 140MHz signal is equal to The local oscillator 2 frequency (2100MHz) minus the 1960MHz IF signal frequency, and the other primary IF signal frequency that meets the secondary IF output 140MHz signal frequency is outside the 2240MHz frequency band, and has been suppressed by the first bandpass filter;
所述带通滤波器二还电性连接有中频放大器二，所述中频放大器二电性连接于检波器，所述变频单元一和变频单元二是用于调整频率在整个检测频带内进行无缝步进扫频，检索局部放电信号频率，输出一个频谱纯净的固定中频信号，可由于变频级输出的宽带信号尚不能为数据采集系统直接应用，必须对信号带宽及信号幅度作适当的调整，以保证固定的频率步进和固定带宽。故而通过而带宽及增益控制单元一和带宽及增益控制单元二在中频控制信号带宽为20MHz，然后进行中频放大，最终输出频率140MHz，幅度适中的信号，再检波后送数据采集系统，该超外差接收机采用高中频设计，保证了接收机中频放大器一输出不受宽带输入UHF信号的影响；中频放大器一输出远大于1500MHz输入频段，采用1960MHz中频输出；本振一频率输出远大于1500MHz输入频段，采用2460～3460MHz本振频率输出，并且该采用了一级低噪声放大器和两级中频放大器，总的增益大于60dB，扣除滤波器、混频器和网络匹配的衰减，超外差接收机增益大于20dB；本设计采用宽带低噪声放大器，频带范围达到50～6000MHz，噪声系数为1.1@1.9GHz，在500～1500MHz频带范围增益为16～17dB；中频放大器采用频带范围为50～4000MHz的RF放大器，在1960MHz频点增益为20.4dB，在140MHz频点增益为23.6dB。The band-pass filter 2 is also electrically connected to the intermediate frequency amplifier 2, and the intermediate frequency amplifier 2 is electrically connected to the detector. The frequency conversion unit 1 and the frequency conversion unit 2 are used to adjust the frequency to perform seamless detection within the entire detection frequency band. Step-by-step frequency sweep, retrieve the partial discharge signal frequency, and output a fixed intermediate frequency signal with a pure spectrum. However, since the broadband signal output by the frequency conversion stage cannot be directly applied to the data acquisition system, the signal bandwidth and signal amplitude must be properly adjusted. Guaranteed fixed frequency step and fixed bandwidth. Therefore, through the bandwidth and gain control unit 1 and the bandwidth and gain control unit 2, the bandwidth of the intermediate frequency control signal is 20MHz, and then the intermediate frequency is amplified, and the final output frequency is 140MHz, and the signal with moderate amplitude is sent to the data acquisition system after detection. The difference receiver adopts the high-frequency design, which ensures that the first output of the intermediate frequency amplifier of the receiver is not affected by the broadband input UHF signal; the first output of the intermediate frequency amplifier is much larger than the 1500MHz input frequency band, and the 1960MHz intermediate frequency output is used; the local oscillator first frequency output is much larger than the 1500MHz input frequency band , using 2460~3460MHz local oscillator frequency output, and this uses a low noise amplifier and two intermediate frequency amplifiers, the total gain is greater than 60dB, deducting the attenuation of the filter, mixer and network matching, the gain of the superheterodyne receiver Greater than 20dB; This design uses a broadband low-noise amplifier with a frequency range of 50-6000MHz, a noise figure of 1.1@1.9GHz, and a gain of 16-17dB in the frequency range of 500-1500MHz; the intermediate frequency amplifier adopts an RF amplifier with a frequency range of 50-4000MHz , the gain at the 1960MHz frequency point is 20.4dB, and the gain at the 140MHz frequency point is 23.6dB.
工作原理，该基于UHF扫频的局部放电检测超外差接收机设计，从UHF传感器接收的局部放电产生的特高频信号频带高达2GHz以上，通过频段选择滤波器限制输入低噪声放大器的UHF信号频带为500～1500MHz，该UHF信号很弱在进入一级混频器之前采用低噪声放大器进行前置放大，放大后的UHF信号与本振一产生的频率信号(2460～3460MHz)一起输入一级混频器变频输出1960MHz中频信号，1960MHz中频信号通过带通滤波器一限制输出带宽为60MHz，经中频放大器一进行放大后与本振二产生的频率信号(2100MHz)一起输入二级混频器变频输出140MHz中频信号，140MHz中频信号通过带通滤波器二限制输出带宽为20MHz，经中频放大器二进行放大后，进入检波器将该140MHz±10MHz中频信号幅度峰值转换为低频模拟电压信号输出。Working principle, the superheterodyne receiver design for partial discharge detection based on UHF frequency sweep, the UHF signal generated by the partial discharge received from the UHF sensor has a frequency band up to 2GHz, and the UHF signal input to the low noise amplifier is limited by the frequency band selection filter The frequency band is 500 ~ 1500MHz, the UHF signal is very weak, before entering the first-stage mixer, it is pre-amplified with a low-noise amplifier, and the amplified UHF signal is input to the first-stage together with the frequency signal (2460-3460MHz) generated by the local oscillator. The frequency conversion of the mixer outputs 1960MHz intermediate frequency signal, and the 1960MHz intermediate frequency signal passes through the band-pass filter 1 to limit the output bandwidth to 60MHz, and after being amplified by the intermediate frequency amplifier 1, it is input to the secondary mixer for frequency conversion together with the frequency signal (2100MHz) generated by the local oscillator 2 Output 140MHz intermediate frequency signal, the 140MHz intermediate frequency signal passes through the bandpass filter 2 to limit the output bandwidth to 20MHz, after being amplified by the intermediate frequency amplifier 2, it enters the detector to convert the peak amplitude of the 140MHz±10MHz intermediate frequency signal into a low frequency analog voltage signal for output.
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still It is possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310073477.1A CN116359680A (en) | 2023-01-18 | 2023-01-18 | Partial discharge detection superheterodyne receiver design based on UHF sweep frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310073477.1A CN116359680A (en) | 2023-01-18 | 2023-01-18 | Partial discharge detection superheterodyne receiver design based on UHF sweep frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116359680A true CN116359680A (en) | 2023-06-30 |
Family
ID=86916597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310073477.1A Pending CN116359680A (en) | 2023-01-18 | 2023-01-18 | Partial discharge detection superheterodyne receiver design based on UHF sweep frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116359680A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650405A (en) * | 2009-08-31 | 2010-02-17 | 保定天威集团有限公司 | Difference frequency anti-interference local discharge online monitoring device |
| CN101776726A (en) * | 2010-01-28 | 2010-07-14 | 广东电网公司电力科学研究院 | Signal receiving conditioner of UHF partial discharge detecting system |
| CN105137306A (en) * | 2015-09-16 | 2015-12-09 | 杭州柯林电力设备有限公司 | Ultrahigh-frequency partial discharge active noise tracking and suppression measurement system and working method thereof |
| CN109327229A (en) * | 2018-10-28 | 2019-02-12 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The spaceborne receiver jamproof system in broadband |
| CN110045256A (en) * | 2019-05-17 | 2019-07-23 | 广东电网有限责任公司 | A kind of SHF frequency range local discharge signal reception circuit |
| CN219641854U (en) * | 2023-01-18 | 2023-09-05 | 西安远测电力科技有限公司 | Partial discharge detection superheterodyne receiver based on UHF sweep frequency |
-
2023
- 2023-01-18 CN CN202310073477.1A patent/CN116359680A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650405A (en) * | 2009-08-31 | 2010-02-17 | 保定天威集团有限公司 | Difference frequency anti-interference local discharge online monitoring device |
| CN101776726A (en) * | 2010-01-28 | 2010-07-14 | 广东电网公司电力科学研究院 | Signal receiving conditioner of UHF partial discharge detecting system |
| CN105137306A (en) * | 2015-09-16 | 2015-12-09 | 杭州柯林电力设备有限公司 | Ultrahigh-frequency partial discharge active noise tracking and suppression measurement system and working method thereof |
| CN109327229A (en) * | 2018-10-28 | 2019-02-12 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The spaceborne receiver jamproof system in broadband |
| CN110045256A (en) * | 2019-05-17 | 2019-07-23 | 广东电网有限责任公司 | A kind of SHF frequency range local discharge signal reception circuit |
| CN219641854U (en) * | 2023-01-18 | 2023-09-05 | 西安远测电力科技有限公司 | Partial discharge detection superheterodyne receiver based on UHF sweep frequency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110350932B (en) | A high frequency wideband receiver and signal processing method | |
| CN114609593B (en) | A harmonic radar based on FPGA and deep learning | |
| CN204103932U (en) | Phase amplitude-matched multi-channel radio frequency simulator | |
| CN102013897A (en) | Aim satellite and data receiving circuit for satellite communication receiver | |
| CN103731170B (en) | High-performance monitoring receiver radio frequency front end design method | |
| CN111464196B (en) | a receiver | |
| CN219641854U (en) | Partial discharge detection superheterodyne receiver based on UHF sweep frequency | |
| CN107171681B (en) | A kind of highly sensitive reception circuit of Ku wave band | |
| CN110011672A (en) | The radio architectures of wide-band communication system | |
| CN101833083A (en) | Radio-frequency front-end circuit of L-band radar receiver | |
| CN110518925A (en) | A kind of high dynamic response signal receiving channel | |
| CN212726995U (en) | Radio frequency signal frequency conversion processing circuit and device | |
| CN201887757U (en) | Aim satellite and data receiving circuit used by satellite communication receiver | |
| CN117420527B (en) | Radar monitoring method based on broadband real-time spectrum analysis | |
| CN116359680A (en) | Partial discharge detection superheterodyne receiver design based on UHF sweep frequency | |
| CN208675206U (en) | The radio architectures of wide-band communication system | |
| CN204836145U (en) | Fast speed adjusting in broadband is receiver frequently based on DDS | |
| CN113381779B (en) | Ultra wideband receiver | |
| CN212364612U (en) | Nonlinear node detector | |
| CN210183323U (en) | High dynamic response signal receiving channel | |
| CN209690499U (en) | A dual-band precipitation particle scattering experimental measurement receiving circuit | |
| CN218450097U (en) | K-waveband low-group delay variation receiving module | |
| CN219065728U (en) | Ultra-high-sensitivity radar radio frequency signal conditioning plate | |
| CN219329735U (en) | Small-sized secondary frequency conversion assembly | |
| CN213461729U (en) | Superheterodyne cubic frequency conversion broadband receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |