Mechanical switch arrangement for on-load tap changer for converter transformer

By placing the switch outside the converter transformer oil tank and using a combination solution of mechanical drive mechanism and current transformer, the ignition problem caused by the switching switch failure in the converter transformer oil tank is solved, and the safety and reliability of the equipment are improved.

CN111540626BActive Publication Date: 2025-03-25STATE GRID CORPORATION OF CHINA +1
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Patent Information

Application Number
CN202010322415.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-04-22
Publication Date
2025-03-25
Estimated Expiration
2040-04-22

AI Technical Summary

Technical Problem

The existing switches placed in the oil tank of the converter transformer are prone to ignition and bursting when they fail, causing the converter transformer to catch fire.

Method used

The switch is set outside the oil tank of the converter transformer, while the tap selector is set inside the oil tank, and the switch switch and tap selector are driven by the mechanical driving mechanism to operate, and the load current is monitored in real time and the fault is disconnected using the current transformer on the connecting cable.

Benefits of technology

It effectively avoids the ignition of the converter oil tank of the converter transformer caused by switching switch failure, improves the safety of the converter transformer, and further reduces the failure risk by real-time monitoring and disconnecting the fault current.

✦ Generated by Eureka AI based on patent content.
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Abstract

The present invention provides a mechanical switch arrangement structure of an on-load tap changer for a converter transformer, the mechanical switch arrangement structure of the on-load tap changer for a converter transformer comprising: a switch and a tap selector; wherein the switch is arranged outside the converter transformer body oil tank, and the tap selector is arranged inside the converter transformer body oil tank; a mechanical driving mechanism is arranged on the converter transformer body oil tank, which is respectively connected to the switch and the tap selector to drive the switch to switch and drive the tap selector to operate. The present invention arranges the switch outside the converter transformer body oil tank of the converter transformer and arranges the tap selector inside the converter transformer body oil tank, so that the switch is separated from the converter transformer body oil tank, so that when the switch interstage short circuit fault occurs, the converter transformer body oil tank can be prevented from catching fire.
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