A detection circuit for internal defect of converter transformer

Abstract

The invention discloses an internal defect detection circuit of a converter transformer, which is composed of a wide-band acoustic wave sensor, a signal separator, a low-frequency signal conditioning unit, a high-frequency signal conditioning unit, an analog-to-digital conversion unit, and a wireless data transmission unit; wherein: the signal separator The chip model of the chip is IA1881, the model of the low-frequency signal conditioning unit and the high-frequency signal conditioning unit adopting the operational amplifier is AD8031, and the model of the analog-to-digital conversion unit adopting the conversion chip is AD7381; the device disclosed by the invention couples the acoustic signal through the sensor, and The signal is separated into vibration wave signal and ultrasonic signal. By analog-to-digital conversion of vibration wave and ultrasonic signal, the digital signal is transmitted through wireless technology, and the sound wave signal emitted by the internal defects of the converter transformer can be obtained, which effectively improves the liveliness of the converter transformer. The efficiency of detection; at the same time, the simultaneous acquisition of multiple parameters ensures the accuracy of detection.

Description

technical field [0001] The invention relates to the technical field of transformer live detection, and more specifically relates to an internal defect detection circuit of a converter transformer. Background technique [0002] Since the structure and operating environment of the converter transformer are different from those of the AC transformer, it is necessary to detect various parameters when diagnosing live internal defects of the running converter transformer, such as ultrasonic testing, vibration testing, vibration testing and ultrasonic testing It plays a vital role in transformer detection. Existing instruments are generally single-function detection, which cannot detect two parameters at the same time, and cannot effectively judge whether there is a defect inside the converter transformer. In view of the above situation, a wide-frequency range acoustic wave circuit is required, which has a wide detection frequency range, can obtain broadband acoustic wave signals, ...

AI Technical Summary

Problems solved by technology

[0002] Since the structure and operating environment of the converter transformer are different from those of the AC transformer, it is necessary to detect various parameters when diagnosing live internal defects of the running converter transformer, such as ultrasonic testing, vibration testing, vibration testing and ultrasonic testing It plays a vital role in transformer detection. Existing instruments are generally single-function detection, which cannot detect two parameters at the same time, and cannot effectively judge whether there are defects inside the converter transformer.

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