The role of online DGA in monitoring power transformers

Transformers are a cornerstone of power generation, and as such maintaining their health and performance levels is critical to everything from keeping the lights on to industrial production. They are also among the most valuable assets in electrical power networks, constituting around 60% of substation capital costs.

维萨拉（Vaisala）一直处于工业测量的最前沿，对在线溶解气体beplay充值的钱可以分析（DGA）了解一两件事。瓦萨拉（Vaisala）非分散红外（NDIR）技术to build a DGA monitor that measures for the seven different types of gas that indicate faults, while some online monitors rely on technologies commonly found in laboratory analysis. In this blog post, we highlight what you need to know when it comes to assessing transformer health, and how you can select a DGA monitor that will provide a comprehensive understanding of your assets’ condition.

关键的故障气体以及为什么它们形成

In a power transformer, the temperature increases at the location of a developing fault. Thermal stresses resulting from the fault will then lead to the formation of gasses, the type and amount of which will indicate the nature of the fault, allowing owners or operators to take corrective action. The more serious a fault, the more gas will be produced, while larger fault areas will also result in higher gas production.

有七个关键的断层气体，需要密切监测其水平，以使资产所有者对变压器健康有全面的了解：甲烷，乙烷，乙烯，乙炔，一氧化碳，二氧化碳和氢。不同的气体将根据故障位置以及变压器中的温度和材料形成。因此，重要的是，关键资产的所有者选择一个可以监视所有这些气体的工具，而不仅仅是一两个。

利用在线DGA监控

Traditionally, the power industry relied on the laboratory testing of manually extracted samples of transformer oil. However, this process was slow, open to various sources of sample contamination and provided only a ‘snapshot’ of transformer health at a particular moment in time.

相比之下，通过不断评估变压器油中这些气体的水平，在线DGA监测可以尽早检测到故障。所使用的技术的复杂性及其利用数字趋势的利用使操作员可以检测出可能在手动油样品中忽略的故障。在变压器维护和维修方面，这会大大降低成本，并最大程度地减少灾难性故障的可能性。

选择理想的在线DGA监视器

虽然有许多在线DGA监视器可用于变压器所有者和运营商，但并非全部创建。当然，可靠测量长期气体趋势是必须的，但是选择监视设备时的其他关键考虑因素将包括其在各种气候条件下运行的能力，可轻松适用于操作变压器的可靠设计，很少需要维护或监视设备本身以确保其有效操作。

当然，成本将是另一个重要因素，但是在这里，重要的是不仅要考虑在线DGA监视器的前期价格，还要考虑与其整个活跃寿命相关的成本。一些在线DGA技术需要消耗品，例如载气或具有维护的活动部件。诸如NDIR之类的替代技术意味着没有额外的安装或维护成本，从而为运营商提供了大量的成本节省。

在线DGA导致了如何监视和维修变压器的海洋变化。它为变压器监视提供了一种更实用和有效的方法，使所有者和运营商更加安心，因为他们知道能量网络中的这些重要联系在峰值状态下运行。

To learn more about the role of online DGA monitoring for power transformers, watch the webinar:Online DGA Monitoring of Power Transformers