Distribution transformer fault diagnosis system and method based on relation between temperature rise and load

Abstract

The invention provides a distribution transformer fault diagnosis system and method based on the relation between temperature rise and load. The distribution transformer fault diagnosis system structurally comprises a transformer, a temperature rise monitoring module, a temperature sensor, a load monitoring module, a voltage and current combination transformer and an analysis module, wherein an output end A of the transformer is connected with the input end of the temperature sensor; an output end B of the transformer is connected with the input end of the voltage and current combination transformer; the output end of the temperature sensor is connected with the input end of the temperature rise monitoring module; the output of the voltage and current combination transformer is connected with the load monitoring module; outputs of the temperature rise monitoring module and the load monitoring module are connected with the analysis module. The system and the method have the advantage of excellent practicability, can be applicable to oil-immersed transformers and dry-type transformers, and are simple in algorithm, and easy to implement. Through the temperature rise test on the type test item of a transformer, the theoretical model accuracy of the relation between the temperature rise of the transformer and the load is ensured, and the possibility that the fault response is insensitive or incomplete due to the fault diagnosis model and algorithm is eliminated.

Description

technical field [0001] The invention relates to an online distribution transformer fault diagnosis system and diagnosis method based on the relationship between temperature rise and load, belonging to the field of intelligent transformers. Background technique [0002] Distribution transformer is one of the most important equipment in distribution network. Accurate diagnosis of its internal latent faults is of great significance to the stable operation of the entire distribution network. The operating temperature rise of the transformer is one of the most important state parameters of the transformer. The operating temperature of the transformer minus the ambient temperature is the operating temperature rise of the transformer. Most of the existing distribution transformers are equipped with temperature monitoring devices. However, only based on the monitored temperature value, the actual operating state of the distribution transformer cannot be judged, because the operatin...

AI Technical Summary

Problems solved by technology

However, only based on the monitored temperature value, the actual operating state of the distribution transformer cannot be judged, because the operating temperature rise of the transformer increases or decreases with the change of the load.

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