Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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高压隔离开关故障防治

2014-1-9 8:22:09      点击:
高压隔离开关 造成上述隔离开关缺陷或故障的原因,既有制造工艺、选材质量问题,也有些是由于检修维护不当所致。要保证隔离开关的安全运行,保证其初始质量是关键所在。
加强选型

要广泛收集系统中运行的隔离开关运行情况,选用结构合理、设计优良、整体质量高的产品。
技术改造

a.对瓷瓶断裂问题必须进行综合治理,首先要保证隔离开关的整体结构合理,其次还要加强对瓷瓶制造企业的选择,可以指定隔离开关生产企业使用质量优、信誉好的瓷瓶制造企业的产品。另外,可以开展无损探伤技术,定期对瓷瓶进行检测。运行人员要加强监视,特别是对瓷瓶胶合面的观察。在运行操作时要方法得当,如出现操作困难时切忌强行操作。
b.隔离开关导电回路发热和瓷瓶闪络现象,严重影响着设备的安全运行。可以更换静触指压紧弹簧为不锈钢弹簧,采用不锈钢螺栓或热镀锌高强度螺栓并用力矩扳手紧固;调整触头插入深度和清洁接触面,或采用类似西门子公司的自清洁触头。同时采用红外测温技术定期检测导电部位的发热情况,发现问题及时处理。
瓷瓶闪络主要是瓷瓶表面和瓷裙内积污严重、瓷裙爬距小造成的。特别是在重污染区内的刀闸,化工污染和水泥积垢不仅使得瓷瓶清扫极为困难,而且空气中大量的工业粉尘和腐蚀性气体的存在极易引起瓷瓶闪络放电,扩大事故范围。2001年,地处徐州北郊化工区的彭场变110kV刀闸发生支持瓷瓶大面积闪络放电,导致瓷瓶爆裂。针对这种情况,可以采取带电清扫加强清扫力度、给隔离开关瓷瓶增加硅橡胶伞裙以增大爬距和利用RTV涂料的憎水性喷涂RTV。
c.锈蚀是影响隔离开关安全可靠运行的首要问题,定期进行防锈处理,对各传动部位加润滑剂,特别是使用性能优于黄油的二硫化钼润滑剂。黄铜轴套更换为钢基表面烧结青铜加改型聚四氟乙烯复合轴套,外表面及端部镀锡以防止锈蚀。机构箱采用质量优良的不锈钢产品,对隔离开关底座进行改造,在底座上钻孔,运行中定期加二硫化钼,确保轴承不生锈。