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A critique on certification of EMC professionals 对EMC专业人员认证的批判
U.K. Nandwani, A.K. Sharma
Because of rapid technological growth of electrotechnical industry and a high degree of obsolescence, human resource requirements are also becoming more specific and fast changing in this field. Technical inputs to these requirements, come from various disciplines like electrical engineering, electronics and telecommunication, physics etc. and manpower inputs from academic on the job experience and competence etc. Many times depending on the maturity of technology, a gap exists between the output of academic institutes and the input requirements of industry and society certified for this skill, competency and knowledge by a credible independent third party. Application and implementation of electromagnetic compatibility (EMC) concepts is a highly skilled and knowledge based activity. Since the effectiveness of any application of EMC techniques and tool depends upon the capabilities of the persons who performs a procedure needs to be developed to provide a means for evaluating and documenting the competence of personnel whose duties require the appropriate theoretical and practical knowledge of the EMC. In this paper the author has focused the need for skilled and specialized certified electromagnetic compatibility (EMC) professionals.
由于电工工业技术的快速发展和高度的过时性,该领域的人力资源要求也变得更加具体和快速变化。这些要求的技术投入来自电气工程、电子和电信、物理等各个学科,而人力投入则来自学术、工作经验和能力等方面。很多时候,取决于技术的成熟度,学术机构的产出与由可信的独立第三方认证的行业和社会对该技能、能力和知识的投入要求之间存在差距。电磁兼容(EMC)概念的应用和实现是一项高度技术性和知识性的活动。由于电磁兼容性技术和工具的任何应用的有效性取决于执行程序的人员的能力,因此需要开发一种方法来评估和记录其职责需要适当的电磁兼容性理论和实践知识的人员的能力。在本文中,作者重点介绍了对熟练和专业认证的电磁兼容性(EMC)专业人员的需求。
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引用次数: 0
Global EMC scenario for public telecommunication networks and Indian perspective 公共电信网络的全球EMC情景和印度观点
A. Gołaś
An overview of EMC from the perspective of a telecommunication network operator is presented. Areas of relevance to a telecommunication network operator are identified with an introduction to some of the EMI related problems including issues relating to activities in the area of adoption of standards, incorporation of standards in procurement specifications, EMC test facilities, installation practices and the need for organisational support. A brief glimpse is provided on the current status of standardisation activities for telecommunication networks at international, regional and national levels. Finally, a brief description is given on the standards prepared by SG 5 of ITU-T available currently, under evolution and other related activities.
从电信网络运营商的角度对电磁兼容进行了概述。通过介绍一些与电磁干扰有关的问题,确定了与电信网络运营商相关的领域,包括与采用标准、将标准纳入采购规范、电磁兼容测试设施、安装做法和组织支持需求等领域的活动有关的问题。简要介绍了国际、区域和国家各级电信网络标准化活动的现状。最后,简要介绍了ITU-T第5研究组制定的现有标准、正在制定的标准以及其他相关活动。
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引用次数: 0
Study of power line conducted transients generated by electrical and electronic devices in a combat tank 作战坦克中电气和电子设备产生的电力线传导暂态研究
S. Sathyamurthy, A. Devarpiran, A. Imayakumar
This experimental study aims at collection of conducted transient data on a power line (DC 28 volt) due to switching actions created by number of electrical and electronics loads in a combat tank. Power quality in a combat tank calls for strict adherence to MIL STD 1275A as number of sensitive electronic subsystems and large current devices are connected in the same bus. A number of transient data captured and recorded are analysed in the paper. Improvements carried out to power quantity by means of controlling the transients and redesign of the power bus are also addressed. Malfunction of sensitive electronic equipment on account of these transients are avoided totally. The concept of distributed power architecture is prescribed for minimum degradation in power quality.
本实验研究的目的是收集电力线(直流28伏)上的传导暂态数据,这些数据是由战斗坦克中许多电气和电子负载产生的开关动作引起的。战斗坦克的电能质量要求严格遵守MIL STD 1275A,因为许多敏感的电子子系统和大电流设备连接在同一总线上。本文对捕获和记录的一些瞬态数据进行了分析。本文还讨论了通过控制暂态和重新设计电源母线来改进功率的方法。完全避免了敏感电子设备因这些瞬变而产生的故障。分布式电源架构的概念是为了将电能质量的退化降到最低而规定的。
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引用次数: 0
Modelling of lightning using fractals 用分形模拟闪电
G. S. Mani
In this paper, basic principles of fractals and their application for analysing EM radiation from lightning discharges in the atmosphere are discussed. Attention is drawn to how fractals have been used for geometric modelling of lightning to take care of tortuosity and branching. EM radiation can be computed from these models to obtain time and frequency domain information, which can be useful in estimating interference levels and setting up EMC standards.
本文讨论了分形的基本原理及其在大气中雷电放电电磁辐射分析中的应用。注意到分形是如何被用于闪电的几何建模,以照顾扭曲和分支。利用这些模型可以计算电磁辐射的时域和频域信息,从而估计干扰水平和制定电磁兼容标准。
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引用次数: 0
Impact of magnetic field on biological function and suppression technique 磁场对生物功能的影响及抑制技术
S. Chattopadhyay
Due to the ever increasing amount of modern equipment, electromagnetic pollution is increasing in a complex manner. In this pollution dominating world the entire human society is living in an electromagnetic environment. The effect of radiation on human beings is now playing a vital role, which may sometimes become fatal. The users and other inhabitants of the vast computer community and others where the chances of the electromagnetic environment existing, have become aware that serious questions are being raised about the potential harmful effects of the electromagnetic emission from display monitors and other such equipment. The magnetic field at ELF, VLF and non-ionizing radiation may cause biological effects and finally may lead to pressure, ulcer, high blood pressure, coronary heart problems and cancer. For magnetic field lines of force that readily penetrate almost anything including the human body, the existence of such a field can be visualized by proper EMC measurements. This paper is a study of the magnetic field produced by visual display units and the preventive measures to minimize the ill-effects.
由于现代设备数量的不断增加,电磁污染正以一种复杂的方式增加。在这个污染占主导地位的世界里,整个人类社会都生活在一个电磁环境中。辐射对人类的影响现在起着至关重要的作用,有时可能是致命的。广大计算机社区的用户和其他居民以及存在电磁环境可能性的其他人已经意识到,正在提出关于显示监视器和其他此类设备的电磁发射的潜在有害影响的严重问题。极低频、极低频和非电离辐射的磁场可能引起生物效应,最终可能导致压力、溃疡、高血压、冠心病和癌症。对于容易穿透包括人体在内的几乎任何物体的磁力线,这种磁场的存在可以通过适当的电磁兼容测量来可视化。本文研究了视觉显示装置产生的磁场及其预防措施,以尽量减少其不良影响。
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引用次数: 0
The chemistry behind grounding 接地背后的化学作用
G. V. Raj, R. Ganesan, S.K. Das
The basic objectives of a good electrical grounding system are for human safety, reliability of equipment operation, fault current return and to limit EMI/transient over voltages coupling. After satisfying all the above requirements, the effect of corrosion on the grounding installation must be considered for sustaining effectiveness of grounding. In this paper various types of corrosion and prevention mechanisms and its importance in grounding are described.
一个良好的电气接地系统的基本目标是为了人类安全、设备运行的可靠性、故障电流返回和限制电磁干扰/瞬态过电压耦合。在满足上述要求后,必须考虑腐蚀对接地装置的影响,以保持接地的有效性。本文介绍了各种类型的腐蚀和预防机制及其在接地中的重要性。
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引用次数: 0
Sharing constraints due to non-GSO constellations 非gso星座的共享约束
A. Gołaś
Proposed allocations by the ITU in the Ku and Ka frequency bands for facilitating induction of non-GSO (non-geostationary orbit) systems using satellite constellations in low Earth orbit have raised a host of contentious issues. The problem of sharing of the radio frequency spectrum by non-GSO systems with the existing terrestrial and GSO satellite systems is complex. Any decision without a complete study is like to lead to the imposition of serious constraints and inequitable allocations. Sharing studies are in progress under the ITU Forum. A Joint Task Group set up on the directions of WRC-97 has concluded its examination of various issues. Due to shortage of time and resources the issues could not be resolved and need to be examined further for ensuring equitable sharing of the radio frequency spectrum. The unresolved issues are discussed.
国际电联提议在Ku和Ka频段进行分配,以促进利用近地轨道卫星星座引入非地球静止轨道系统,这引发了许多有争议的问题。非GSO系统与现有地面和GSO卫星系统共享无线电频谱的问题是复杂的。任何未经全面研究的决定都可能导致施加严重的限制和不公平的分配。国际电联论坛正在进行研究交流。根据WRC-97的指示设立的一个联合工作队已经结束了对各种问题的审查。由于时间和资源短缺,这些问题无法解决,需要进一步审查,以确保公平共享无线电频谱。讨论了尚未解决的问题。
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引用次数: 1
Overvoltage transient protection network design 过电压暂态保护网络设计
S. Karunakaran, A. Sajeev
Transient over-voltages caused by lightning, couples on to data communication or instrumentation signal lines and introduce serious fault alarm conditions and damage instrumentation electronics. Protection circuits to minimise the transient over-voltage are commercially available for variety of installation requirements. However, if an electronic system designer intend to build a protection circuit, a custom design will be desirable as the interface or inter-connection could be more effective for the intended environment. This paper brings out the various designs approach for a number of applications from radio communication antennas port to data acquisition signal lines. Also, the design details for a hybrid protection circuit is provided along with the results achieved.
雷电引起的瞬态过电压,对数据通信或仪表信号线的耦合,并引入严重的故障报警条件和损坏仪表电子设备。将瞬态过电压降至最低的保护电路可用于各种安装要求。然而,如果一个电子系统设计师打算建立一个保护电路,一个定制的设计将是可取的,因为接口或互连可能更有效的预期环境。本文介绍了从无线电通信天线端口到数据采集信号线的各种应用的设计方法。此外,还提供了混合保护电路的设计细节以及所取得的结果。
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引用次数: 0
Some aspects of bulk cable current injection (BCCI) test method at system level testing of an aircraft 飞机系统级测试中电缆大电流注入(BCCI)测试方法的几个方面
D. C. Pande, M. Aravind
The Bulk Cable Current Injection (BCCI) testing, at equipment/subsystems/system level has been recognised as a promising technique in lieu of radiated susceptibility testing upto few hundreds of MHz. Although it is an efficient technique for the evaluation of electromagnetic susceptibility (EMS) of the system, but at the same time due to its instrumentation particularly bulky and heavy current injection and monitoring probes, put a restriction to the use of BCCI, in the integrated system testing. In this paper, the use of BCCI test facility for integrated aircraft testing has been critically analysed and discussed. Problems which may arise due to the generation of strong harmonic products up to HF band in BCCI testing also have been discussed with their solutions.
在设备/子系统/系统水平上,大电缆电流注入(BCCI)测试已被认为是一种有前途的技术,可以代替高达数百MHz的辐射敏感性测试。虽然它是评估系统电磁敏感性(EMS)的一种有效技术,但同时由于其仪表特别笨重且电流注入和监测探头大,限制了BCCI在集成系统测试中的使用。本文对BCCI测试设备在综合飞机测试中的应用进行了批判性的分析和讨论。讨论了BCCI测试中高频强谐波产生可能引起的问题及其解决方法。
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引用次数: 2
Comparison method for validation of radiated emission test site 辐射发射试验场验证的比较法
K. Sakthivel, S.K. Das, R. Ganesan, D. Kumar
Summary form only given. As per ANSI C 63.4-1992, a Radiated Emission Test Site (RETS) shall be considered acceptable for radiated electromagnetic field measurements if the measured Normalized Site Attenuation (NSA), are within +4 dB of the theoretical NSA for an ideal site for both horizontal and vertical polarizations. ANSI C 63.4-1992 allows +4 dB NSA tolerance, which includes antenna/instrumentation calibration errors, measurement technique errors, and errors due to site anomalies. These errors are analyzed in ANSI C 63.6-1988, wherein it is shown that more than 50% of the total allowable tolerance is contributed by the antenna factors of the transmit and receive antennas used and the performance of a well-built site contributes only 1 dB. Experience has shown that antenna factor variations may be caused by the antenna height variations and polarization changes with respect to the ground plane, the use of measurement geometries, mutual coupling, and transmission line scattering for vertically polarized antennas. Also, in ANSI C 63.4-1992, a single-point NSA measurement is carried out which is insufficient to pick up all possible reflections from the site very accurately. In this paper a new methodology is proposed called the "Comparison Method", in which the uncertainty in antenna factors used for SA measurements is avoided. In this approach, instead of a comparison of measured with theoretical "NSA" as given in ANSI C 63.4-1992, the RETS is validated by comparing the SA's measured at different locations without changing the antenna path geometry, because only one reflecting surface (metal ground plane) exists.
只提供摘要形式。根据ANSI C 63.4-1992,如果测量的归一化站点衰减(NSA)在水平和垂直极化的理想站点的理论NSA的+4 dB范围内,则辐射发射测试站点(RETS)应被认为是可接受的辐射电磁场测量。ANSI C 63.4-1992允许+ 4db NSA公差,其中包括天线/仪器校准误差,测量技术误差和由于站点异常引起的误差。这些误差在ANSI C 63.6-1988中进行了分析,其中表明,所使用的发射和接收天线的天线因素贡献了总允许公差的50%以上,而精心构建的站点的性能仅贡献了1db。经验表明,天线因子的变化可能是由天线高度的变化和相对于地平面的极化变化、测量几何形状的使用、相互耦合和垂直极化天线的传输线散射引起的。此外,在ANSI C 63.4-1992中,进行了单点NSA测量,这不足以非常准确地从站点拾取所有可能的反射。本文提出了一种称为“比较法”的新方法,该方法避免了用于SA测量的天线因素的不确定性。在这种方法中,与ANSI C 63.4-1992中给出的测量与理论“NSA”的比较不同,RETS通过比较在不同位置测量的SA来验证,而不改变天线路径几何形状,因为只有一个反射面(金属接平面)存在。
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Proceedings of the International Conference on Electromagnetic Interference and Compatibility
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