消除在线DGA监控中的测量漂移
A look at the benefits of Vaisala's proprietary IR reference measurement
No measurement device is safe from drift. That’s a fact. But what is it and what can you do to prevent it? This blog has the answers.
What is drift? And why should you care?
漂移只是一个技术术语，可以描述这样一个事实，即每个单个测量设备（无论地球上的何处和地球何处）都会随着时间的流逝而进行不同的测量。在第1天，您可能会获得精确且可靠的测量结果。您期望的结果。您可以信任的结果。
但是随着时间的流逝，事情会改变。对于所有设备，这都是正确的。您的汽车的里程表，磁带尺寸，DGA监视器...无论您使用哪种尺寸的设备，它都会磨损，变脏，变暗，伸展，缩小，收缩...一句话，其性能将改变。对于高科技而言，这与您的眼睛或拇指一样。这意味着，随着时间的流逝，即使被测量的东西没有改变，结果也会缓慢，直到您无法相信结果为止。
溶解气体分析（DGA）漂移
当您测量像电力变压器一样关键的东西时，根本无法容忍漂移。如果您不能相信结果，那么您的维护决策基于什么？错误的警报呢？
In IR-based DGA, gas measurement is specifically about measuring how much light passes through a gas sample. The more gas, the less light comes through to the sensor. In IR, drift is primarily caused by:
1. Light source aging. The older the light source, the dimmer it will get.
2.光学污染。污垢，灰尘，油和其他材料将粘附在光学零件上，使光输出变暗。
Both will cause the IR light to get dimmer — and that's the core of the problem. Dimmer light means less light will be detected, which the measurement device will interpret to mean there'smore gas than there really is。That will lead to a false alarm, costing you money and trouble.
但是Vaisala开发了一种消除漂移的解决方案。
Vaisala如何最大程度地减少在线DGA中的漂移？
首先，为了最大程度地减少漂移效果，在设计时已经考虑了一些常见问题Optimus™ online DGA monitor。For the IR light drift specifically, the Optimus hasan ultra-stable microglow lightsource, manufactured in our own clean room. Its lifespan has been tested to be decades, and it will stay bright for longer than conventional light sources. To eliminate light source dimming through dirt and dust, the Optimus™ has密封的设计that prevents contamination.
但是，即使这也无法完全消除漂移。
完全消除漂移的影响 - 擎天柱的秘密成分。
Vaisala开发了一种我们称为的技术IR reference measurement。即使存在引起漂移的元素，它也会给出稳定，可靠的DGA结果。
The Optimus measures twice on each measurement cycle. Once in a vacuum, which tells us the maximum amount of light available from the IR microglow. Then the measurement is repeated with the extracted gas. And because the maximum amount of available light is known, we can reliably measure the absorption of light in gas and completely eliminate the effects of drift. Resulting in robustly reliable DGA readings.
The end result? No matter how long you operate your Optimus, its measurement will be as reliable as the day it was first powered on. And when you can trust the measurement data, you can make better-informed decisions.
That's all there is.
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