CN107612642A - A kind of signal band and out-of-band interference level method of testing - Google Patents
A kind of signal band and out-of-band interference level method of testing Download PDFInfo
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Abstract
本发明涉及一种信号频带及频带外的干扰电平测试方法,包括:计算机终端启动载波通信测试项目,通过通信接口向被测集中器或抄读器发出载波通信命令;接收被测载波表的数据,判断载波通信成功与否;同时通过通信接口通知测试系统,工控机开始该项目的测试流程控制程序;当测试系统内部的频谱仪完成测试载波发送电平参数后,工控机发出停止测试命令;根据载波通信结果调整测试系统的工作状态,从通信接口读取工控机存储的测试数据并完成处理。本发明按照DL/T 698给定方法进行,取样信号经过隔离电平变换等电路,针对发送端和接收端的取样再送频谱仪进行测量,得到实际的载波电平,实现了测试稳定性高抗干扰能力强的优点。
The invention relates to a signal frequency band and a method for testing interference levels outside the frequency band, comprising: a computer terminal starts a carrier communication test item, and sends a carrier communication command to a concentrator or a reader through a communication interface; Data, to judge whether the carrier communication is successful or not; at the same time, the test system is notified through the communication interface, and the industrial computer starts the test process control program of the project; when the spectrum analyzer inside the test system finishes testing the carrier transmission level parameters, the industrial computer sends a stop test command ; Adjust the working state of the test system according to the carrier communication result, read the test data stored in the industrial computer from the communication interface and complete the processing. The present invention is carried out according to the given method of DL/T 698. The sampling signal is passed through circuits such as isolation level conversion, and then sent to the spectrum analyzer for measurement according to the sampling of the sending end and the receiving end, and the actual carrier level is obtained, which realizes high test stability and anti-interference The advantages of strong ability.
Description
技术领域technical field
本发明涉及信号频带、最大输出信号电平及频带外的干扰电平测试技术领域,尤其是一种信号频带及频带外的干扰电平测试方法。The invention relates to the technical field of testing the signal frequency band, the maximum output signal level and the interference level outside the frequency band, in particular to a method for testing the signal frequency band and the interference level outside the frequency band.
背景技术Background technique
随着电力系统自动化程度的提高,以及计算机技术在电力系统中日益广泛的应用。传统的电量计费方式由于其效率低、投入大、可靠性差等弊端,已无法适应新的形势要求。建立一套高精度、稳定可靠、自动化程度高的电能量自动计量系统具有实际应用意义。With the improvement of the degree of automation of the power system, and the increasingly widespread application of computer technology in the power system. Due to its disadvantages such as low efficiency, large investment, and poor reliability, the traditional electricity billing method has been unable to adapt to the requirements of the new situation. It is of practical significance to establish a high-precision, stable, reliable, and highly automated electric energy automatic metering system.
计量自动化终端设备通过本地通信网络与电能表通信之间进行通信,在用电信息采集系统的框架内,本地通信网络主要由低压电力线载波、RS-485和微功率无线等组通信方式组成。相较于其他通信方式,低压电力线载波这种施工便捷、成本低廉的方案备受电力公司青睐。但随着集中抄表系统的建设和试点工作的开展,相关问题逐渐显现。电力载波通信所采用的通信信道存在一定的先天缺陷,由于低压电力线的原始设计是为了保证配电线路的电力输送,并不是专门用于传输高频信号的通信载体,所以低压电力线路上存在着噪声干扰大、衰减变化快、线路阻抗随着拓扑结构的改变和负载的接入而不断变化,同时线路长度和连接节点等不确定因素也对低压电力线载波通信速率和可靠性造成影响,急需研发一种信号频带及频带外的干扰电平测试方法。The metering automation terminal equipment communicates with the energy meter through the local communication network. Within the framework of the electricity consumption information collection system, the local communication network is mainly composed of low-voltage power line carrier, RS-485 and micro-power wireless communication. Compared with other communication methods, the low-voltage power line carrier, which is convenient for construction and low in cost, is favored by power companies. However, with the construction of the centralized meter reading system and the development of pilot work, related problems gradually emerged. The communication channel used by the power carrier communication has certain inherent defects. Since the original design of the low-voltage power line is to ensure the power transmission of the distribution line, it is not a communication carrier specially used to transmit high-frequency signals, so there is noise on the low-voltage power line. Large interference, fast attenuation changes, line impedance changes with topology changes and load access, and uncertain factors such as line length and connection nodes also affect the communication rate and reliability of low-voltage power line carriers. It is urgent to develop a A signal frequency band and a method for testing the interference level outside the frequency band.
发明内容Contents of the invention
本发明的目的在于提供一种保证电平测试的结果具有可比性、实现了测试稳定性高抗干扰能力强的信号频带及频带外的干扰电平测试方法。The purpose of the present invention is to provide a method for testing the interference level of the signal frequency band and outside the frequency band, which ensures the comparability of the level test results and realizes high test stability and strong anti-interference ability.
为实现上述目的,本发明采用了以下技术方案:一种信号频带及频带外的干扰电平测试方法,该方法包括下列顺序的步骤:In order to achieve the above object, the present invention adopts the following technical solutions: a signal frequency band and an interference level testing method outside the frequency band, the method comprising the steps of the following sequence:
(1)计算机终端启动载波通信测试项目,即最大输出信号电平及带外干扰电平测试程序,通过通信接口向被测集中器或抄读器发出载波通信命令;(1) The computer terminal starts the carrier communication test item, that is, the maximum output signal level and the out-of-band interference level test program, and sends a carrier communication command to the tested concentrator or reader through the communication interface;
(2)接收被测载波表的数据,判断载波通信成功与否;(2) Receive the data of the measured carrier table, and judge whether the carrier communication is successful or not;
(3)同时通过通信接口通知测试系统,工控机开始该项目的测试流程控制程序;(3) At the same time, the test system is notified through the communication interface, and the industrial computer starts the test process control program of the project;
(4)当测试系统内部的频谱仪完成测试载波发送电平参数后,工控机发出停止测试命令;(4) After the spectrum analyzer inside the test system completes the test carrier transmission level parameters, the industrial computer sends a stop test command;
(5)根据载波通信结果调整测试系统的工作状态,从通信接口读取工控机存储的测试数据并完成处理。(5) Adjust the working state of the test system according to the carrier communication results, read the test data stored in the industrial computer from the communication interface and complete the processing.
计算机终端启动载波通信测试项目时,测试系统内加入净化电源系统,净化电源系统提供通信接口理想低压电力线模拟测试环境。When the computer terminal starts the carrier communication test project, a clean power supply system is added to the test system, and the clean power supply system provides an ideal low-voltage power line simulation test environment for the communication interface.
通过单相载波电能表或三相载波电能表接收被测载波表的数据,判断载波通信成功与否。Receive the data of the measured carrier meter through the single-phase carrier energy meter or three-phase carrier energy meter to judge whether the carrier communication is successful or not.
工控机开始该项目测试流程控制程序时,采用数字示波器对测试过程进行监控,在时域反映载波通信的实际时序。When the industrial computer starts the test process control program of the project, a digital oscilloscope is used to monitor the test process and reflect the actual timing of the carrier communication in the time domain.
在步骤(5)中,进行数据处理时,信号频带测试按照DL/T 698标准进行,先用频谱仪测试最大信号电平,再对当前频谱进行幅度分析,得到比最大信号小20dB的偏离中心频率的一对频点,将该对频点的频率相减,取绝对值,得到当前载波信号频带。In step (5), when performing data processing, the signal frequency band test is carried out according to the DL/T 698 standard. First, use a spectrum analyzer to test the maximum signal level, and then perform amplitude analysis on the current spectrum to obtain an off-center value 20dB smaller than the maximum signal A pair of frequency points of the frequency, subtract the frequency of the pair of frequency points, take the absolute value, and obtain the current carrier signal frequency band.
由上述技术方案可知,本发明的优点在于:第一,本发明按照DL/T 698给定方法进行,该项目的关键是信号电平的测量,要保证电平测试的结果具有可比性;第二,必须具有适当的测试环境,人工电源网络可以承担这个角色,利用人工电源网络稳定的阻抗特性达到测试一致性的目标,借用GB/T6113.103-2008关于人工电源网络的设计思路,进行载波信号的取样;第三,取样信号经过隔离电平变换等电路,送程控开关,作为测试端口,计算机选通不同的测试端口代表不同信号的取样,针对发送端和接收端的取样再送频谱仪进行测量,得到实际的载波电平,实现了测试稳定性高抗干扰能力强的优点。As can be seen from the above-mentioned technical solution, the advantages of the present invention are: first, the present invention is carried out according to the given method of DL/T 698, and the key of this project is the measurement of signal level, to ensure that the results of the level test are comparable; the second Second, there must be an appropriate test environment. The artificial power network can take on this role, and use the stable impedance characteristics of the artificial power network to achieve the goal of test consistency. Borrow the design ideas of GB/T6113.103-2008 on the artificial power network to carry out carrier Signal sampling; thirdly, the sampling signal is sent to the program-controlled switch through isolation level conversion and other circuits, as a test port, and the computer selects different test ports to represent different signal sampling, and then sends the spectrum analyzer for measurement according to the sampling of the sending end and the receiving end , to obtain the actual carrier level, and realize the advantages of high test stability and strong anti-interference ability.
附图说明Description of drawings
图1为本发明的方法流程图。Fig. 1 is a flow chart of the method of the present invention.
具体实施方式detailed description
如图1所示,一种信号频带及频带外的干扰电平测试方法,该方法包括下列顺序的步骤:As shown in Figure 1, a kind of signal frequency band and the interference level test method outside the frequency band, this method comprises the steps of following sequence:
(1)计算机终端启动载波通信测试项目,即最大输出信号电平及带外干扰电平测试程序,通过通信接口向被测集中器或抄读器发出载波通信命令;(1) The computer terminal starts the carrier communication test item, that is, the maximum output signal level and the out-of-band interference level test program, and sends a carrier communication command to the tested concentrator or reader through the communication interface;
(2)接收被测载波表的数据,工作人员通过载波表的数据判断载波通信成功与否;(2) Receive the data of the measured carrier meter, and the staff judge whether the carrier communication is successful or not through the data of the carrier meter;
(3)同时通过通信接口通知测试系统工控机开始该项目的测试流程控制程序;测试系统由频谱分析仪和数字示波器组成;(3) At the same time, notify the test system industrial computer to start the test flow control program of the project through the communication interface; the test system is composed of a spectrum analyzer and a digital oscilloscope;
(4)当测试系统内部的频谱仪完成测试载波发送电平参数后,工控机发出停止测试命令;(4) After the spectrum analyzer inside the test system completes the test carrier transmission level parameters, the industrial computer sends a stop test command;
(5)根据载波通信结果调整测试系统的工作状态,从通信接口读取工控机存储的测试数据并完成处理。(5) Adjust the working state of the test system according to the carrier communication results, read the test data stored in the industrial computer from the communication interface and complete the processing.
计算机终端启动载波通信测试项目时,测试系统内加入净化电源系统,净化电源系统提供通信接口理想低压电力线模拟测试环境。When the computer terminal starts the carrier communication test project, a clean power supply system is added to the test system, and the clean power supply system provides an ideal low-voltage power line simulation test environment for the communication interface.
通过单相载波电能表或三相载波电能表接收被测载波表的数据,判断载波通信成功与否。Receive the data of the measured carrier meter through the single-phase carrier energy meter or three-phase carrier energy meter to judge whether the carrier communication is successful or not.
工控机开始该项目测试流程控制程序时,采用数字示波器对测试过程进行监控,在时域反映载波通信的实际时序。When the industrial computer starts the test process control program of the project, a digital oscilloscope is used to monitor the test process and reflect the actual timing of the carrier communication in the time domain.
在步骤(5)中,进行数据处理时,信号频带测试按照DL/T 698标准进行,先用频谱仪测试最大信号电平,再对当前频谱进行幅度分析,得到比最大信号小20dB的偏离中心频率的一对频点,将该对频点的频率相减,取绝对值,得到当前载波信号频带。In step (5), when performing data processing, the signal frequency band test is carried out according to the DL/T 698 standard. First, use a spectrum analyzer to test the maximum signal level, and then perform amplitude analysis on the current spectrum to obtain an off-center value 20dB smaller than the maximum signal A pair of frequency points of the frequency, subtract the frequency of the pair of frequency points, take the absolute value, and obtain the current carrier signal frequency band.
本发明利用信号电平测试思路,同样对带外电平进行测试,虽然,698规定了信号频带的测试办法,但是,带外电平的带外并不能用信号频带的相应点作为判据,因为最大信号电平的幅值减去20dB后还远远大于频带外的规定电平数值,所以,频带外的干扰电平测试频点并不能移用信号频带的测试结果,按照通信频带的划分通常分为信号通带、邻道通道、隔道通带等,但按照载波频谱的实际结果,确认该项指标是较为困难的,目前主要考核的是载波信号的谐波电平是否满足频带外的信号电平的要求,698规定的频带外的干扰电平指标如下:The present invention uses the idea of signal level testing to test the out-of-band level similarly. Although 698 stipulates the test method for the signal frequency band, the corresponding point of the signal frequency band cannot be used as a criterion for the out-of-band level, because the maximum After subtracting 20dB, the amplitude of the signal level is far greater than the specified level value outside the frequency band. Therefore, the test frequency points of the interference level outside the frequency band cannot be transferred to the test results of the signal frequency band. According to the division of the communication frequency band, it is usually divided into It is the signal passband, the adjacent channel channel, the separated channel passband, etc. However, according to the actual results of the carrier spectrum, it is difficult to confirm this indicator. At present, the main assessment is whether the harmonic level of the carrier signal meets the requirements of the signal outside the frequency band. Level requirements, the interference level indicators outside the frequency band specified in 698 are as follows:
(1)9kHz~150kHz频带的最大干扰电平不大于60dBμV;(1) The maximum interference level in the frequency band from 9kHz to 150kHz is not greater than 60dBμV;
(2)150kHz~500kHz频带的最大干扰电平不大于50dBμV;(2) The maximum interference level in the frequency band from 150kHz to 500kHz is not greater than 50dBμV;
(3)大于500kHz频带的最大干扰电平不大于46dBμV。(3) The maximum interference level greater than 500kHz frequency band is not greater than 46dBμV.
如果频带外的干扰电平满足DL/T 698规定的带外干扰电平指标,则判据合格;反之判据不合格。If the out-of-band interference level meets the out-of-band interference level index specified in DL/T 698, the criterion is qualified; otherwise, the criterion is not qualified.
综上所述,本发明按照DL/T 698给定方法进行,该项目的关键是信号电平的测量,要保证电平测试的结果具有可比性;取样信号经过隔离电平变换等电路,送程控开关,作为测试端口,计算机选通不同的测试端口代表不同信号的取样,针对发送端和接收端的取样再送频谱仪进行测量,得到实际的载波电平,实现了测试稳定性高抗干扰能力强的优点。In summary, the present invention is carried out according to the given method of DL/T 698. The key of this project is the measurement of the signal level, to ensure that the results of the level test are comparable; the sampling signal is sent to the The program-controlled switch is used as a test port. The computer selects different test ports to represent the sampling of different signals. The samples from the sending end and the receiving end are sent to the spectrum analyzer for measurement, and the actual carrier level is obtained, which realizes high test stability and strong anti-interference ability. The advantages.
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Application publication date: 20180119 |