Fiber grating temperature measurement system and method for high overload distribution transformer

Abstract

The invention discloses a fiber grating temperature measurement system and method for a high overload distribution transformer. The system comprises: a broadband light source; a controllable sawtooth wave generating circuit; an F-P cavity tunable filter, used for demodulating narrow band spectra generated by the broadband light source into astigmatic spectral signals according to the drive of a sawtooth wave voltage output by the sawtooth wave generating circuit; an optical splitter, used for splitting the astigmatic spectral signals output by the F-P cavity tunable filter to a required number of optical paths and communicating with a fiber grating temperature sensor; a calibration device, used for determining the relation between the voltage of the tunable light source and the central wavelength in real time; and a photoelectric detection module, used for converting reflected wave reflected by each sensing grating and uniquely corresponding to the sensing grating from an optical signal to an electrical signal and transmitting the electrical signal to a data acquisition card. By utilizing a quasi-distributed fiber grating temperature measurement technology, high-precision measurement of hot-spot temperature of the high overload distribution transformer is realized, and aging evaluation and remaining life cycle prediction of the high overload distribution transformer are realized.

Description

technical field [0001] The invention relates to an on-line monitoring technology for power transmission and distribution equipment, more specifically, uses a quasi-distributed optical fiber grating temperature sensor to measure the hot spot temperature of a power distribution transformer and predict the life cycle of the power distribution transformer. Background technique [0002] The rural power grid has the characteristics of load dispersion, strong seasonality, low average load rate, and large peak-to-valley difference. From the analysis of operation conditions, the load of rural power grids increases rapidly during special periods (such as Spring Festival and busy farming seasons). Short-term overload and heating problem is very prominent. The hot spot temperature of the inner winding of the transformer is directly related to its insulation performance and aging life. Exceeding the allowable value of the temperature will reduce the service life of the transformer, espec...

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Problems solved by technology

Distribution transformers are directly connected to users, and their load curves fluctuate greatly, especially the distribution transformer load in rural power grids has irregular time-varying characteristics. The existing patent "Method for Transformer Life Prediction Based on Fiber Bragg Grating In terms of temperature sensitivity and accuracy, it is not able to reflect the process of continuous change of hot spot temperature rise of high overload distribution transformer windings in real time and accurately.

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