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    <p class=MsoNormal style='line-height:14.0pt'><span lang=EN-US
    style='font-size:9.0pt'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    "Times New Roman";mso-hansi-font-family:"Times New Roman"'>  这是每期里的一个特色栏目,主要讲述一些电磁干扰的事件。我们通过收集国内外有关资料,挑出一些极具代表性和启迪性的事件,每次</span><span
    lang=EN-US style='font-size:9.0pt'>3</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>-</span><span lang=EN-US style='font-size:9.0pt'>4</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
    mso-hansi-font-family:"Times New Roman"'>条介绍给大家。目的在于使大家在以后的相关工作中避免类似事件的再次发生。如果大家对我们所提供的资料有什么见解,非常感谢来信(</span><span
    lang=EN-US style='font-size:9.0pt'>E-mail</span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>方式)与我们共同交流,探讨更好的处理方法,同时也欢迎大家把你们在实际工作中碰到的一些有趣的电磁干扰现象来信告诉我们,与大家共亨。</span><span
    lang=EN-US style='font-size:9.0pt'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    "Times New Roman";mso-hansi-font-family:"Times New Roman"'>  </span><span
    lang=EN-US style='font-size:9.0pt'>1</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>、为了处理不断增长的北海石油矿藏,苏格兰建立了两个</span><span lang=EN-US
    style='font-size:9.0pt'>6MW</span><span style='font-size:9.0pt;font-family:
    宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>可变速感应电动泵抽油站,其中一个在</span><span
    lang=EN-US style='font-size:9.0pt'>Negherly</span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>,一个在</span><span lang=EN-US style='font-size:9.0pt'>Balbeggie</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
    mso-hansi-font-family:"Times New Roman"'>,这两台设备一投入运行,本地电站和电话局收到的控诉便如洪水般的涌来,从区域看,投诉集中在距离这两台设备的高空供电线(</span><span
    lang=EN-US style='font-size:9.0pt'>33kV</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>)</span><span lang=EN-US style='font-size:9.0pt'>12</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
    mso-hansi-font-family:"Times New Roman"'>英里以内的范围。距离供电线</span><span
    lang=EN-US style='font-size:9.0pt'>4</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>英里的付费电话非常嘈杂,几乎不能使用,然而仅隔一条街道,一住户的电话却不受影响,其他征兆还有:电视帧同步丢失(屏幕滚动),辉光放电电路的振铃。尽管这两台装置的设计符合电力工业的</span><span
    lang=EN-US style='font-size:9.0pt'>G5/3</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>谐波标准,这些现象证实它包含的更高次谐波,事实上可达</span><span lang=EN-US
    style='font-size:9.0pt'>100</span><span style='font-size:9.0pt;font-family:
    宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>次(即</span><span
    lang=EN-US style='font-size:9.0pt'>5kHz</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>),这个问题成为所有些行业工作人员的一个共同头痛的问题。最终,这些问题引起政府部门的注意,因此迫切需要做些</span><span
    lang=EN-US style='font-size:9.0pt'>EMC</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>补救工作。尽管这样极度困难,因为石油泵站停机的代价非常高,但最终还是完成了。</span><span
    lang=EN-US style='font-size:9.0pt'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    "Times New Roman";mso-hansi-font-family:"Times New Roman"'>  </span><span
    lang=EN-US style='font-size:9.0pt'>2</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>、</span><span lang=EN-US style='font-size:9.0pt'>1992</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
    mso-hansi-font-family:"Times New Roman"'>年,医务工作者在将一心脏病人送往医院的途中,救护车上的监视器</span><span
    lang=EN-US style='font-size:9.0pt'>/</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>电震发生器始终对她进行观察。不幸的是,当医务人员一打开无线通话机请求帮助时,心机就会关闭。结果这位病人死了。分析表明:因为救护车顶已由金属材料改为玻璃钢,使得监视器单元暴露在特别高的场内,同时车内又安装有远程无线天线。因此这证明:汽车屏蔽效能的降低与强辐射信号的结合对此设备干扰极大。</span><span
    lang=EN-US style='font-size:9.0pt'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    "Times New Roman";mso-hansi-font-family:"Times New Roman"'>  </span><span
    lang=EN-US style='font-size:9.0pt'>3</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>、计算机室里,在靠近门边装有高科技猫门(磁感应触发),每当</span><span lang=EN-US
    style='font-size:9.0pt'>Windows</span><span style='font-size:9.0pt;
    font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
    "Times New Roman"'>加载或</span><span lang=EN-US style='font-size:9.0pt'>Windows</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
    mso-hansi-font-family:"Times New Roman"'>应用程序运行时,猫门上的插销便不停地嗒嗒作响。</span><span
    style='font-size:9.0pt'> <span lang=EN-US><o:p></o:p></span></span></p>
    <p>  <span lang=EN-US>4、美国Langley空军基地救援调度中心报告称,他们用于侦探和营救的卫星在频率121.5MHz和243MHz处受到干扰。其波及范围大约在8英里左右。这个问题十分严重,因为在这些频率上,仅能在大约一英里的范围内检测到一般的警报发射机发出的信号。最后终于弄清此问题是由于高空输电线的连接不好所致。<br>
    <br>
      5、“英雄工程”中有关工程师的一则广告引用海军电子战分部副主任,海军少将Roland T Guilbalt的话称,在沙漠屏障(DESERT
    SHIELD)和沙漠风暴(DESERT STORM)行动中都受到了严重的电磁干扰的影响。目前我们还得不到更多的有关信息,但推测是由于在军事上首次应用了大量的高科技民用设备。<br>
    <br>
      6、在伦敦地区,电源线上有过多的谐波成分,结果导致交流电源电缆(包括泰晤士河下的部分电缆)过热。造成这种后果的主要原因是个人计算机的迅速普及。在有计算机的办公用房里,与荧光灯配合使用的功率补偿电容破裂越来越常见(电工通常是取掉破裂的电容器)。电源线谐波污染的另一个后果是,零线过热甚至损坏的现象,电子开关设备损坏的现象越来越普遍。在美国,火险公司被提醒:如果没有检验投保公司所使用的零线尺寸和对谐波电流的热承受能力,则不要承接新的保单。<o:p></o:p></span></p>
    <p> <span lang=EN-US><o:p></o:p></span></p>
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