Multi-point temperature measurements on transformers
It must show where the temperature is rising and how strong it is. You can find out here why this is the case and how it can be implemented in practice.
The problem of multi-point temperature measurements on transformers
The higher the operating temperature of transformers, the shorter their service life. The temperature-dependent aging of the insulation materials is particularly important. In this context, we are talking about lifetime consumption, which increases exponentially with temperature. Operating for 10 hours at 86 degrees Celsius results in a lifetime consumption that is almost similar to operating for one hour at 110 degrees Celsius.
With an even temperature distribution, all components are subjected to the same thermal load, which has a positive effect on the service life. However, if temperature hotspots occur, these individually contribute significantly to aging and thus to the failure of the transformer. Such hotspots can no longer be seen from the outside after a transformer has been manufactured. However, multi-point temperature measurements on transformers for temperature monitoring are possible if the transformers are already equipped with a measuring system during manufacture.
With such multi-point temperature measurements on transformers, temperature hotspots are automatically detected and transmitted to an alarm system.
The solution using MICRONOR
The multi-point temperature measurements on transformers can be realized with a fiber optic measuring system. Electrical measuring sensors are not suitable because the data would be unreliable due to the high currents and the associated electromagnetic fields and therefore cannot fulfill their purpose. On the other hand, multi-point temperature measurements on transformers with a fiber-optic measuring system provide reliable data and remain unaffected by disruptive factors that occur. Based on the Raman effect, only a single optical fiber is required. During the production of a transformer, this fiber is cast and laid along the windings. The fibers can have a length of up to 250m.
The measuring principle of the multi-point temperature measurements on transformers works as follows: A short pulse of light is radiated into the optical fiber with a laser. As a result, the photons of this light impulse scatter on the molecules of the glass fiber. When the temperature increases, the wavelength of the backscattered photon shifts. This shift in wavelength is proportional to the temperature difference encountered, enabling reliable multi-point temperature measurements on transformers.
With an additional measurement of the time that the photons need until they are measured at the detector, the position of the temperature increase can be precisely determined. This makes it possible to record the temperature at any point along the fiber.
Products for multi-point temperature measurements on transformers from MICRONOR
We at MICRONOR offer suitable products for multi-point temperature measurements on transformers: The MR610 controller is the evaluation unit in which the temperature is determined based on the Raman effect. The controller enables the temperature of transformers to be monitored and detects weak points immediately after each measurement.
You will also find the necessary accessories for the MR610 controller with us. The MR611 sensor fiber is fully assembled and ready for your multi-point temperature measurements on transformers. It already includes a pigtail and a sump. The MR612 measuring fiber together with the MR614 connection fiber and sump with the MR615 sump fiber also results in a complete measuring cable for the MR610 controller. Another measuring fiber, the MR613 , is also available.
Conclusion
The problem of multi-point temperature measurements on transformers can be reliably solved with the special solution from MICRONOR. Do you also have a special problem? Then feel free to contact us. We will find a solution together.
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