Measuring ESDD at Representative Sites Along the Network
inmr adv CTC


November 10, 2015 • Photo of the week

污染闪络,如于2000年西开普敦的那次大规模停电,一直是反复造成南非电力公司Eskom的难题。因此,他们的策略是通过不断地监视ESDD水平影响绝缘子预测此类事件。这是通过使用一个遥远的变电站和定向灰尘测量计(DDDG),以及参考的玻璃绝缘子串安装在其他站点的网络。除了数据使用DDDGs在这些地点收集,评估静电放电试验的第二个方面涉及服用积累污染的读数的7个标准玻璃壳组成参考绝缘子串的表面上。字符串中的每个盘在不同的时间间隔与顶部和底部单元总是只充当'假人'进行了分析。 一个典型的测量开始与包裹用胶带,以防止其沉积污染影响的实际绝缘表面上的读取盘的金属帽。该玻璃随后在恒定的1升容积去离子水的桶充分洗涤一米之前读取所得到的溶液的导电性。水的温度也被记录来校正电导值到一个标准的20℃。已知的玻璃盘的区域(在这种情况583.9平方厘米在顶部和704平方厘米在底部),相关联的静电放电试验的值可以计算为每个。读数然后平均出并绘制随时间对每个光盘从字符串采样,连同上沉淀从雨量计收集的信息,以允许真正污染场景的完整画面。 静电放电试验读数为每个圆盘典型地通过位置的字符串中各不相同,与光盘在某些位置更容易堆积的污染,由于空气动力学效应。所有的数据,然后发送到Eskom公司的规划部门,和负责对各变电站以及他们的上司,然后,是可以采取任何补救措施可能需要的任何问题出现前的那个人。 (MEASURING ESDD AT REPRESENTATIVE SITES ALONG THE NETWORK) Pollution flashovers, such as the massive ones that blacked out much of the Western Cape in 2000, have been recurring problems for South African power utility Eskom. Their strategy has therefore been to anticipate such events by constantly monitoring ESDD levels that affect insulators. This is done using a far-flung network of substations and other sites where directional dust deposit gauges (DDDG) as well as strings of reference glass insulators are installed. Apart from data collected using DDDGs at these locations, the second aspect of assessing ESDD involves taking readings of accumulated pollution on the surfaces of reference insulator strings composed of 7 standard glass shells. Each disc in the string is analyzed at different time intervals with the top and bottom units always functioning only as ‘dummies’. A typical measurement begins with the metal cap of the disc wrapped with tape to prevent its deposited contamination from impacting the reading on the actual insulation surface. The glass is then washed thoroughly in a tub of de-mineralized water of constant one-liter volume before a meter reads conductivity of the resulting solution. Temperature of the water is also recorded to correct conductance values to a standard 20°C. Knowing the area of the glass disc (in this case 583.9 cm2 at the top and 704 cm2 at the bottom), associated ESDD values can be calculated for each. Readings are then averaged out and charted over time for every disc sampled from the string, along with information on precipitation collected from rainfall gauges, to allow a complete picture of the real pollution scenario. ESDD readings for each disc typically vary by location in the string, with discs in certain positions more likely to accumulate pollution due to aerodynamic effects. All the data is then sent to Eskom’s planning department and to the individuals responsible for each substation as well as their supervisors, who can then take whatever remedial action may be required before the onset of any problems. Measuring ESDD at Representative Sites Along the Network esdd 在代表站点沿网络测量ESDD Photo of the Week Mar 23                 


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