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Electrical Thermography The Electrical Thermography serves to detect thermal anomalies in electrical installations. Electrical installations and facilities.

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Presentation on theme: "Electrical Thermography The Electrical Thermography serves to detect thermal anomalies in electrical installations. Electrical installations and facilities."— Presentation transcript:

1 Electrical Thermography The Electrical Thermography serves to detect thermal anomalies in electrical installations. Electrical installations and facilities are flown through by a load current. On the one hand there are the „natural“ inner resistances and on the other side contact resistances. These resistances lead to a heating up of the components. The main task of the electrical thermography is to find defective electrical connections and to localize anomalies of overload on wires, components and switchboards. The increasing temperature at connecting parts often has a simple reason. The temperature rises because of broken screw connections, broken clips or springs or because of the decomposing of pressure discs. For the most part, heatings appear because of a rise of contact resistances. Another reason for a heating up can be wrong material used for the connections. The wrong material causes high inner and contact resistances which lead to a heating. If you use Thermography for electrical maintanance you can simply find Hot Spots on components. Here you can see one fuse which is much warmer than the rest of the fuses. It is now about the expert to say, whether this temperature is normal for this component or not. The contact spring weared out over the years, so the clamping force is not strong enought to transmit the electrical power. Out of this reason, the contact resistance increases and the component starts to heat up. The reason of the heating after the startup is trivial: When the construction was assembled, the bore holes were too small, so they were bored up. Because of this, there occured some edges around the bore hole. These edges were not removed. Now the electrical power goes through the very small cross-section of the edge with an increased resistance. This causes the heating. Applications testo 885 -Detector Size 320 x 240 Pixel -Large Field of View 30° Standard-Objektiv and an IFOV of 1,7 mrad -Better thermal sensitiveness <30mK -See more with the big colour display 4,3“ -Ergonomic twist handle and rotatable display -SiteRecognition-Technology, automates the documentation of IR-pictures -Panorama Assistent for the measurement on big objects -SuperResolution provides 640 x 480 measuring values -testo IR-Soft, cost- and licence free evaluation software with professional analysis features. How to invalidate prejudices of the customer …  … the camera is to heavy and unbalanced Please take one of our object lenses in your hand. Testo only uses high end germanium and large weld nugget diameter to ensure the best picture and measurement quality. This leads us to the weight of our High-End cameras. To compensate, we have a twistable handle to ensure a comfortable handling.  … the camera does not look robust, rotable display could break As a premium provider we test our mechanical parts at life tests under enormous stress. Our folding mechanism takes more than test cycles under high pressure. This equates to an intensive use over more than 10 years.  … SuperResolution is only interpolation Our SuperResolution-Technologie uses a highly complex technique for 4x more real measurement values. The improvement of our optical solution (iFoV) was proven by the famous Fraunhofer Institut for Optronic, system technology und image evaluation in June  … we only have a refresh rate of 33 Hz The human eye is not able to see higher refresh rates than 33 Hz. Besides of this, the measuring quality becomes worse if you clock the sensor higher than 33 Hz. There is only one exception. If you have very fast running applications, you need higher frequencies than 33 Hz. But for this, you should in general use fixed cameras.  … Testo has no video output available Instead you can show with Testo-Thermal-Imagers not only a Video. You will be able to display and save all measuring data in realtime via USB-connection. This provides much more information than a single video output.  … the user-friendliness Testo-Cameras is than the competitors Thousands of excited customers tell us the opposite. You can use thermal imagers of testo directly after the unboxing in an intuitive way. Even our Software IRSoft can be intuitively used by customers of every degree of knowledge, from beginner to expert. Make yourself the testo experience before buying another camera!

2 Here you can see, that the connection between the two parts of the scissor heats up in comparison to the rest of the construction. The error can be found in a defect shim. Without a thermal imager, this error would be very difficult to find. High Energy Processes For production processes which need high energy, for example iron and steel production, as well as brick and glas production, Thermography is used for the equipment condition monitoring of industrial kilns and other energy intensive facilities. Especially measurements in the high temperature sector are of interest. Machines, arbors and bearing are stressed by the high temperatures and have to be checked preventively. This reducts the default risk. Thermography supports especially the following parameters: 1.Security of employees and preventive reduction of fire risks 2.Assurance of process temperatures - Product quality - Production efficiency 3.Energy efficiency Applications Energy-intensive facilities like kilns do not only cause high energy costs if their isolation is insufficient, they can become a security risk towards fire and health risks. Air blowers are important parts of industrial facilities. They usually work under known stresses and temperatures. If the temperature goes higher, caused by an error of the mechanical components, you can see it on the infrared picture. At energy intensive facilities like this glas-production, the camera serves for several quality checks. The cooling process is one of the most important things. With our cameras. it can be simply checked and documented. testo 885 -Detector Size 320 x 240 pixel -Large Field of View 30° standard objektive -High Temperature up to 1.200°C -SiteRecognition-Technology, automates the documentation of your IR-pictures -SuperResolution Technology enables an IFOV of 0,4 mrad (tele lens) and 1,0 mrad for the standard objektive -Changeable 11° tele objektiv -testo IR-Soft, cost- and licence free evaluation software with professional analysis features. -Panorama Assistent for the measurement on big objects -twistable handle to ensure a comfortable handling + movable display How to invalidate prejudices of the customer …  … the camera is to heavy and unbalanced Please take one of our object lenses in your hand. Testo only uses high end germanium and large weld nugget diameter to ensure the best picture and measurement quality. This leads us to the weight of our High-End cameras. To compensate, we have a twistable handle to ensure a comfortable handling.  … the camera does not look robust, rotable display could break As a premium provider we test our mechanical parts at life tests under enormous stress. Our folding mechanism takes more than test cycles under high pressure. This equates to an intensive use over more than 10 years.  … SuperResolution is only interpolation Our SuperResolution-Technologie uses a highly complex technique for 4x more real measurement values. The improvement of our optical solution (iFoV) was proven by the famous Fraunhofer Institut for Optronic, system technology und image evaluation in June  … we only have a refresh rate of 33 Hz The human eye is not able to see higher refresh rates than 33 Hz. Besides of this, the measuring quality becomes worse if you clock the sensor higher than 33 Hz. There is only one exception. If you have very fast running applications, you need higher frequencies than 33 Hz. But for this, you should in general use fixed cameras.  … Testo has no video output available Instead you can show with Testo-Thermal-Imagers not only a Video. You will be able to display and save all measuring data in realtime via USB-connection. This provides much more information than a single video output.  … the user-friendliness Testo-Cameras is than the competitors Thousands of excited customers tell us the opposite. You can use thermal imagers of testo directly after the unboxing in an intuitive way. Even our Software IRSoft can be intuitively used by customers of every degree of knowledge, from beginner to expert. Make yourself the testo experience before buying another camera!


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