![]() ![]() The principal behind them is the use of two dissimilar metals that expand at different rates to drive the indicating pointer on the dial. These temperature indicators are made using bi-metal technology. ![]() These units could be easily read by the user at eye level in the position where they are mounted. Direct Mount Oil & Winding Temperature Indicatorsĭirect mount OTI/WTI are generally chosen for smaller, lower voltage transformers where the temperature indicator can be submerged directly into the insulating oil. They both accomplish the same end goal of driving the temperature indication pointer. Each has their own advantages and have been around for many decades. The mechanism that drives the pointer is one of two technologies typically used for this application, either bellows-type or bourdon spring technology. This capillary is filled with a fluid that expands as the temperature rises and moves an indication pointer on the face of the dial. A capillary connects the temperature sensing bulb and the body of the OTI / WTI indicator which includes the measurement dial. The temperature sensing bulb is mounted in a pocket that is generally difficult to reach and the body of the indicator is mounted at eye level in another location on the transformer. Remote mount OTI / WTI units are used for larger transformers where due to their size, the top oil well or pocket is not accessible from the ground, making it hard to see the temperature dial. Indicators can be purely mechanical or have some integrated contacts and electronics to provide the additional alarming capability. There are a variety of different types of oil and winding temperature indicators (OTI/WTI) on the market based on the size and functionality required on power transformers. Maintaining proper cooling controls can also extend the lifetime of the transformer past the typical life expectancy. Electrical utilities often utilize oil and winding temperature indicators to provide alarm and control signals that are used to activate cooling control systems on a transformer. They are commonly referred to in the industry as Oil Temperature Indicators (OTI) and Winding Temperature Indicators (WTI). Temperature indicators are most commonly utilized for the indication of top oil or winding hotspot temperatures which are both critical parameters to measure within a transformer. Reliable and accurate temperature measurement ensures a longer life for your transformer and is crucial to maintaining the overall health of the asset. Oil and winding temperature are critical parameters that are measured in power and distribution transformers. AKM 44611/48471 Top-Mounted ThermometerĠ6.04.20 Everything You Need to Know About Transformer Oil and Winding Temperature Indicators.Qualitrol 120 Side-Mount Thermometer with 6″ Dial.Qualitrol 165/167 Side-Mount Thermometer with 5″ Dial.Qualitrol 121 Direct Mount Thermometer with 4.5″ Dial.Qualitrol 150/151 Side-Mount Thermometer with 4″ Dial.Qualitrol NOMAD-Touch Portable Fiber Optic Monitor.Neoptix T1 Fiber Optic Temperature Probe.Neoptix T2 Transformer Temperature Probe. ![]()
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