Transformer state detection device and breaker

Abstract

The invention discloses a transformer state detection device. The transformer state detection device is characterized in that according to internal distance changes under various working states of transformers, the internal resistance changes are converted into changes of level waveforms by the aid of independent detection circuits and a level conversion circuit, and the current working states of the transformers are judged according to different level waveforms. The invention further discloses a breaker with the transformer state detection device. Compared with the prior art, the transformer state detection device and the breaker have the advantages that disconnection faults of the transformers can be detected, internal resistance changes of the transformers caused by other faults can be detected accurately, and integral system safety can be improved greatly. The independent detection circuits are used, so that influences of transformer state detection on current signal sampling are eliminated, and current measurement precision of the intelligent breaker is improved.

Description

technical field [0001] The invention relates to a transformer state detection device, which is used for on-line detection of whether the working state of the transformer is normal. Background technique [0002] At present, the low-voltage intelligent circuit breaker integrating protection, measurement and monitoring has become the development trend of low-voltage electrical appliances. As its core component, the intelligent controller includes various functions such as current and voltage sensors, signal processing and display, and control execution. / The voltage transformer provides a source of information for subsequent processing and control, and is a prerequisite for ensuring the normal operation of the circuit breaker. The current / voltage transformer is the basic component of the intelligent circuit breaker to realize current / voltage measurement and protection, and its working reliability is directly related to the overall reliability of the circuit breaker. The trans...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiency that the existing transformer detection device can only detect whether the transformer is disconnected, and to provide a transformer state detection device, which can not only judge whether the transformer is disconnected, but also judge whether the transformer is disconnected or not. Whether the transformer is variable resistance, so as to conduct more accurate online monitoring of the state of the transformer itself

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