变电站没有辐射，还有建在小区里的原因ZT
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">需求决定建设，城市供电需要。按照供电安全性要求，在城市负荷密集区，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">110</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">千伏变电站只能覆盖约两平方公里左右的供电面积，仅在城市外围建设变电站等电力设施，难以满足市民的用电需求。</SPAN></P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">因此，在城市中心密集区建设符合城市规划要求和高标准环保要求的电力设施，是缓解日益严重的用电紧张问题，确保市民正常的工作和生活用电最关键的措施之一。为了满足广州地区高峰超</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1000</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">万千瓦的负荷需求，提高供电的可靠性，必须增加输变电工程建设的投入，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">30</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">年来广州地区变电站数目增长了近十倍。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">随着需求的增加，未来十年，广州地区将建设近</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">200</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">座变电站才能满足供电要求。为什么广州需要这么多变电站？其实理解了变电站的工作原理就明白了：大功率的远程电能输送通常是将发电厂端的电压升高到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">500kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">交流或直流用架空输电线路传输到负荷中心附近的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">500kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变电站，变为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">220kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的传输电压经过</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">220kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">架空或电缆向设在城市边缘或市中心的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">220kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变电站供电，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">220kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变电站所供出的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">110kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电源经过输电电缆（有宽阔走廊处用架空输电线）向位于负荷中心的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">110kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变电站供电，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">110kv</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变电站的作用就是将输送到负荷中心的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">110kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">电压降低到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">并可靠地配送到位于建在每栋高层居民楼下的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">配电房的变压器去将</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10kV</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">降压到</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">380/220V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">供广大居民使用。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">随着现代居民用电负荷的不断增长，城市供电的负荷密度越来越大，变电站的可供电半径越来越小，在有些地段，变电站的供电半径还不足</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">500</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">米。为保证对用户的不间断供电，变电站的供电范围是交叉的，以保障事故时用户的可靠供电。</SPAN></P>
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