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Abstract
In order to realize distributed measurement of transformer winding temperature and deformation, a transformer winding modification scheme with a built-in distributed optical fiber was designed. By laying a single-mode fiber and a multi-mode fiber on the transformer winding, the Brillouin optical time domain reflection technique (BOTDR) and the Raman optical time domain reflection technique (ROTDR) are used to measure the strain and temperature of the winding to complete the more accurate winding deformation detection. The accuracy of strain and temperature sensing of this scheme was verified by simulation. Then, according to the scheme, a winding model was actually wound, and the deformation and temperature rise tests were carried out. The test results show that this scheme can not only realize the deformation detection and positioning of the winding, but can also realize the measurement of the winding temperature; the temperature measurement accuracy reached ±0.5 °C, the strain measurement accuracy was 200 με, and spatial resolution was up to 5 m. In this experiment, the deformation location with the precision of 2 turns was realized on the experimental winding.
Highlights
The transformer is an important part of the power system
The results show that the temperature difference between the winding and boundaries are open boundaries, which simulate a single-turn winding in an operating transformer
The solid mechanics simulation of the winding model verifies that the sensing fiber laid in the winding can realize the sensing of the winding strain, and the mean value of the stress on the fiber has a quadratic relationship with the degree of winding deformation, R2 = 0.9999
Summary
The transformer is an important part of the power system. Its safe and stable operation is an important guarantee for the stability of the power system. Conventional winding deformation detection includes the short-circuit impedance method, the low-voltage pulse method [2], the frequency response method [3,4,5], the vibration method [6], ultrasonic methods [7,8], etc. Most of these methods have been widely used in power systems and have formed industry standards. There are still problems such as difficulty in fault location, low detection accuracy, and vulnerability to external interference
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