简体中文
- Authors: M. Marzinotto, TERNA Italy – J.M. George, Sediver France – G. Pirovano, RSE Italy
- Title: Field experience and laboratory results on the application of RTV coating on HVDC lines.
- Presented at: CIGRE 2020 PARIS – cigre e-session 48 – Aug 24 – Sep 3 2020
Abstract
The utilization of RTV pre-coated insulators is rapidly expanding worldwide thanks to the very positive laboratory and field returns.
TERNA started the installation of pre-coated glass cap and pin insulators in 2003 on AC lines up to the 380 kV voltage level and today there are more than 1 million units installed in the Italian high voltage grid. No flashover was reported through all these years of service and insulation washing was no longer needed on those line equipped with RTV insulators.
Every year tests for the evaluation of both coating degradation and ageing are performed on different units removed after different years of service from the lines.
The outcomes of such tests are different since they are strictly related to the environment in which the insulators are exposed. In the worst condition sensitive changes related to degradation or ageing have been pointed out, even if both laboratory tests and field experience confirm their high level of endurance.
Since 2008 TERNA decided to gradually expand the installation of pre-coated glass cap and pin insulators on HVDC lines considering the very good returns of the AC applications.
Since degradation and ageing are different in DC, specific tests were performed in laboratory to make some inference on endurance.
This paper reports different type of tests on RTV pre-coated cap and pin insulators for DC applications with the aim to characterize the behaviour on new and field returned units among which results from the multi-stress ageing test (known as 2000 hour Terna’s test), which represents a particularly significative test for the overall evaluation of the performances of the insulators. The results of such tests are compared with the results of tests carried out on naturally aged insulators (after 7, 8 and 9 years of installation) in order to quantify the extent of aging in operation and estimate the useful life of the RTV coating.
New insulator strings were tested in laboratory in different string configurations (“I” string, “V” string and quite horizontal string) and applying in sequence twice the 2000 h ageing test. Test results from laboratory and field aged samples pointed out interesting information.
A discussion on the comparison of such results in terms of hydrophobicity, hydrophobicity recovery and reduction of flashover performances (evaluated through the “quick flashover method”) is reported, since both hydrophobicity recovery and flashover voltage reduction are considered as operational degradation factors for ageing inference. Both tests on laboratory aged sampled and on field returned samples highlight the high level of reliability of pre-coated glass cap and pin insulators also for DC applications.
Read the paper
You can read the paper through our download center or by clicking on this link.
通过本表格收集的信息由SEDIVER（简化的股份有限公司）处理，该公司在Nanterre 贸易和公司登记处注册，注册号542035761，总部位于7/9 allée de l 'Arche 92400 Courbevoie，目的是允许您下载我们的白皮书文件，并向您发送我们集团公司和产品的信息。这些处理活动的法律依据是我们需要知道谁访问和下载了我们的资源，以及给他们发送直接市场沟通的合法权益。
带有星号(*)的字段是必填信息。如您没有提供所需的信息，将无法下载白皮书文件。
在适用的当地法律允许的范围内，您有权访问、整改、消除和限制对您的个人数据的处理,也有权规定在您身故后的数据处理方案，您同时拥有您个人数据的数据可携权。您也有权利通过勾选本表格的专用框，并在任何时候通过点击我们所有市场传播中的取消订阅链接来拒绝接收市场传播。
如欲了解更多有关我们如何处理您的个人资料及如何行使您的权利，请参阅SEVES集团欧盟隐私政策及SEDIVER隐私政策。
如需更多信息，请咨询我们的隐私政策。