▎ 摘　　要

NOVELTY - The method involves using tapered optical fiber to measure the oil inlet in the transformer cooling system, the temperature of the pipeline and the oil outlet pipeline (S11). The speed sensor is used to measure the oil inlet and the oil flow velocity on the pipeline and the oil flow line is obtained to assist the temperature flow rate parameter used as the basis for decision-making (S12). The GBDT diagnostic module is used to measure data by the above-mentioned tapered optical fiber and speed sensor are used as GBDT diagnosis module input, the transformer winding hot spot temperature as output of the GBDT diagnostic module (S13). USE - Method for monitoring temperature fault of power transformer in a power system. ADVANTAGE - The conical optical fiber is arranged on the surface of the oil tank, so it can realize the oil inlet pipeline and the oil outlet pipeline and near the temperature change of the measuring function, improves the monitoring speed and accuracy. The surface of conical region is coated with a layer of graphene, when the cooling system is subjected to temperature change, by the change of refractive index of the graphene the incident light can generate phase difference at the tapered optical fiber. The oil pressure of the inner position is high, the flow speed is fast, so the temperature of the winding can be more quickly diffusion, solves the problem that the existing technology when measuring the top oil temperature, the real time is bad. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a power transformer temperature fault monitoring system. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of the power transformer temperature fault monitoring method. (Drawing includes non-English language text). S11Using tapered optical fiber to measure the oil inlet pipeline and the temperature of the oil outlet pipeline S12Using a speed sensor to measure the oil on the oil inlet pipeline and the oil outlet pipeline flow velocity, to get the flow velocity parameter used to assist temperature as decision-making basis S13Using the GBDT diagnostic module, the tapered optical fiber and the speed sensor, the measured data is used as the input of the GBDT diagnostic module, and the transformer's the winding hot spot temperature is used as an output of the GBDT diagnostic module