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Influence of Volcanic Ash fall on Distribution Lines

火山灰降落对配电线路的影响

基本信息

批准号：
05650281
负责人：
IRISA Toshiyuki
金额：
$ 1.41万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

In the area having heavy volcanic ashfall, the distribution line trouble has been caused. It seems owing to the increase of the leakage current on the insulators polluted by volcanic ashes. We examine the factors which increase the leakage current and decrease the fluctuations of it in order to abate the distribution line trouble caused by the volcanic ashfall. For this purpose, to begin with, the electric characteristics are in detail examined, for example, the chemical compositions of the volcanic ashes and the electric conductivity, the ion concentration etc.of the volcanic ashes solution. Then on these basic data, the dependence of the leakage current on the various conditions of insulators and high voltage cut-out bases and arresters polluted by volcanic ashes is experimentally investigated. As the result, the following matters are elucidated :1. The leakage currents are increased and in addition the fluctuations of them are increased involving the generation of corona only when t … More he ashes accumulated in the ribs of insulators become wet.2. A combination of the strain insulator with the anti-pollution type insulator restrains the generation of a corona, even if the insulators are polluted by the volcanic ashes. This combination enables us to limit the fluctuations of the zero-phase-sequence voltage and to diminish the service interruption problems caused by the operation of the circuit breaker.3. The volcanic ashes increases the leakage current in the case of the strain insulator, the high voltage cut-out base and the arrester but littel leakage occurs in the case of the pin insulator.4. The observation of a corona makes us presuppose that the potential gradient in the ribs of the strain insulator is large.Accordingly, it follows that in order to decrease leakage currents, the strain insulator should be lengthened in the inner-cylinder within the insulator, as well as in the anti-pollution type insulator.In addition, the policies for abating the troubles also are got such as the determination of the most suitable direction, numbers and insulator types. Less

在火山灰沉降严重的地区，配电线路出现故障。这似乎是由于火山灰污染绝缘子的泄漏电流增加所致。为了减少火山灰引起的配电线路故障，我们研究了增加泄漏电流和减小其波动的因素。为此，开始，详细检查电特性，例如火山灰的化学成分和火山灰溶液的电导率、离子浓度等。在此基础上，对火山灰污染的绝缘子、高压断路器底座和避雷器的泄漏电流与各种条件的关系进行了实验研究。其结果是，以下事项得到澄清：1。泄漏电流增加，此外，它们的波动增加，涉及电晕的产生，只有当 ...更多信息积聚在绝缘体肋部中的灰变湿。应变绝缘子与防污型绝缘子的组合抑制了电晕的产生，即使绝缘子被火山灰污染。这种组合使我们能够限制零相序电压的波动，并减少断路器操作引起的服务中断问题。3.火山灰增大了耐张绝缘子、高压断路器底座和避雷器的泄漏电流，但对针式绝缘子的泄漏影响不大.电晕现象的观察使我们假定耐张绝缘子肋部的电位梯度很大，从而得出了在耐张绝缘子内筒和防污型耐张绝缘子中，为了减少泄漏电流，应延长耐张绝缘子的长度，并得出了减少故障的对策，如确定最佳方向，数字和绝缘体类型。少