xuwu95 发表于 2010-3-11 11:54:00

外场监控防雷怎么做合理？

那位高手请指点一下，外场监控立柱，防雷接闪器与立柱需要绝缘吗？引下线怎么做？信号线怎么走合理？

eie1992 发表于 2010-3-13 15:53:00

<p><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">1)</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">安防系统室外摄像机，防直击雷只能用独立避雷针保护。摄像机不能安装在避雷针体上，摄像机立杆不要做成避雷针方式，摄像机要与立杆绝缘，千万不要接大地；</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></span></p>
<p><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">2</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">）安防系统不允许多点接地，前端摄像机都必须和大地绝缘。防感应雷应选用防雷器，有的防雷器有接大地点，但不能把</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">“</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">视频信号地</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">”</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">也给接了大地；</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">“</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">视频信号地</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">”</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">常态下必须与大地绝缘；</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US"><o:p></o:p></span></p>
<p><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">3</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">）不管考虑防雷，防干扰，防静电安防系统前端都不允许直接接大地，即：不允许系统中存在</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">“</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">地环路</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">”</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">。安防系统只能有一个接大地点：系统主机接大地，这是安全接地，也用于泄放系统静电；</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US"><o:p></o:p></span></p>
<p><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">4)</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">系统摄像机也必须和钢结构建筑物，金属吊顶天花板，线槽，电梯轿厢等保持绝缘；</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US"><o:p></o:p></span></p>
<p><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font face="Verdana">5</font>）前端摄像机安装在避雷针上和系统存在</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">“</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">地环路</span><span style="COLOR: black; FONT-SIZE: 12pt" lang="EN-US">”</span><span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">，都是安防系统重大安全隐患；</span><span lang="EN-US"><o:p></o:p></span></p>
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