Method for determining dynamic overload curves of transformers based on operating data

Abstract

The invention discloses a method for determining dynamic overload curves of transformers based on operating data. The method includes: A), adapting basic configuration subjected to overload curve calculation according to basic configuration information of the transformers to the transformers different in types and cooling ways; B), reading real-time operating data of the transformers to complete preparation for real-time data of the transformers; C), calculating cooling capacity of the transformers and initiating cooing power of the transformers; D), analyzing historical load trend of the transformers and forecasting future loads of the transformers; E), calculating hot-limit time of the transformers according to the winding hot-spot temperature of the transformers; F), modifying the hot-limit time of the transformers according to overload capacity tables of initialized transformer tables; G), matching the overload curves by adopting a Bezier grid to complete and determine dynamic overload curve graphs of the transformers. Since the dynamical overload curve graphs can be generated by the method, scientific and effective reference can be provided for load control.

Description

technical field [0001] The invention relates to power transformer technology, in particular to a method for determining a dynamic overload curve of a transformer based on operating data. Background technique [0002] At present, the power transformer overload curve is mainly generated based on the temperature rise calculation and life analysis of the transformer. The algorithm is mainly based on the temperature rise calculation formula in IEC 60076-7 "Oil-immersed Transformer Load Guidelines" to establish the transformer temperature rise and life loss model, starting from mathematical statistics, using the probability distribution point of view, on the basis of the measured load , calculate a reasonable typical overload curve, so that it can correctly reflect the actual condition of the transformer operation, the general substation is based on the overload curve diagram of the transformer factory test as a reference, and use this overload curve to guide the actual overload ...

AI Technical Summary

Problems solved by technology

[0008] At present, there are two methods for generating overload curves at home and abroad: one is based on the transformer factory test data, which is to calculate the transformer overload curve according to the temperature rise and corresponding data obtained from the transformer factory test according to the "Oil-immersed Transformer Load Guidelines". The load capacity generates an overload curve, or directly applies the overload curve of the transformer factory. The disadvantage is that it cannot truly reflect the actual overload capacity of the transformer and wastes transformer resources.

The method based on the factory test data only calculates an ideal overload curve of the transformer, and has reservations about the actual overload capacity of the transformer; it does not consider the overload capacity of the components of the transformer, and the overload capacity of the transformer components also affects the overload curve of the transformer; Poor real-time performance, unable to generate dynamic overload curves based on transformer real-time data

The other is to calculate the transformer overload capacity and generate an overload curve according to the actual operating load and ambient temperature of the transformer according to the "Oil-immersed Transformer Load Guidelines". The disadvantage is that it can only calculate the overload capacity of the transformer under the current steady-state load state , the future load of the transformer cannot be predicted according to the historical load curve of the transformer; the overload capacity of the components of the transformer is not considered, and the overload capacity of the transformer components also affects the overload curve of the transformer; the real-time performance is poor, and the overload capacity cannot be dynamically calculated in real time and generated overload curve

[0009] No matter which method is used in the existing technology, the overload capacity of the transformer components and the real-time dynamic load of the transformer are not considered, and the real-time dynamic calculation of the transformer overload capacity and the generation of dynamic overload curves are not solved.

Images