Device for injecting sweep frequency signal into distribution transformer winding online

Abstract

The invention provides a device for injecting a sweep frequency signal into a distribution transformer winding online. The device comprises a sweep frequency signal generator, a signal power amplifier and a capacitive coupling sensor, wherein the capacitive coupling sensor is disposed at the outside of a root of a sleeve of a transformer high-voltage outgoing line, the device further comprises a main controller, a data collection device and a Rogowski coil disposed at the outside of the root of a transformer neutral point sleeve, the collection device is respectively connected with the sweep frequency signal generator and the Rogowski coil, and the main controller is connected with the data collection device. By setting the capacitive coupling sensor to inject the sweep frequency signal into the winding of the transformer without contact, transformer deformation detection is performed in a non-contact manner without changing the system wiring, there is no influence on the transformer system, and the safety is high. The time interval of the sweep frequency signal generator to send the signals is set according to the change of the transformer parameter data, thereby not only ensuring the reliability of the online detection, but also prolonging the life of the device.

Description

technical field [0001] The present disclosure relates to the technical field related to transformer detection, and in particular, relates to a device for online injection of frequency sweeping signals into windings of distribution transformers. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Winding deformation of power transformer means that under the action of electric force and mechanical force, the size or shape of the winding is irreversible. Statistics show that short-circuit faults of transformers are the main faults, which often cause varying degrees of deformation and insulation damage of transformer windings. Therefore, windings have become one of the most important reasons for threatening the stable operation of power systems. Winding deformation detection is very important for preventing Transformer winding damage plays an i...

AI Technical Summary

Problems solved by technology

Most of the existing offline measurements are used, and the judgment results are not accurate

In online measurement, many methods obtain frequency response curves by injecting signals at the end screen or end of the bushing to detect winding faults online, but this method of contacting the system for injecting signal detection will cause unpredictable risks to the normal operation of the system , at the same time, because it is not convenient to install the detection device on site, it is difficult to realize the hanging network operation of this kind of contact measurement device with the system.

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