Load tap changer with fastener

By employing a fastener design in the OLTC using bolts, bushings, and resilient components, the risk of failure due to wear under moving conditions is addressed, improving the robustness and reliability of the equipment, reducing wear and internal stress, and enhancing durability.

CN122122686APending Publication Date: 2026-05-29HITACHI ENERGY LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI ENERGY LTD
Filing Date
2024-12-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Under mobile operating conditions, the fasteners between the components of an OLTC are prone to wear, increasing the risk of failure, especially when used on offshore floating platforms. This problem has not been effectively solved in the prior art.

Method used

The fastener design incorporates bolts, bushings, and resilient members. The bushings provide a smooth interface to reduce bolt wear, and the resilient members allow relative movement between the housing body and the bushings to absorb dynamic loads. At the same time, the bushings form a tight fit with the metal body to reduce relative movement.

Benefits of technology

It improves the robustness and reliability of OLTC, reduces fastener wear, decreases internal stress, enhances durability under dynamic load conditions, and allows for greater manufacturing tolerances without affecting assembly.

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    Figure CN122122686A_ABST
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Abstract

An on-load tap changer (OLTC) (1) comprising a housing, the housing comprising a housing main body (2) and a metal main body (3), the metal main body (3) being attached to the housing main body (2) by a plurality of fasteners (4), each of the fasteners (4) comprising a bolt (5) configured to extend from outside the housing main body (2) through a respective hole of the housing main body (2) and engage a threaded hole of the metal main body (3) inside the housing main body (2), the fastener (4) further comprising a bushing (6) inserted into the respective hole of the housing main body (2), the bushing (6) comprising a central opening through which the bolt (5) extends. A resilient member, for example of rubber or elastomer, is arranged between the bushing (6) and the housing main body (2) and is configured for aligning the bushing (6) with the respective hole of the housing main body (2).
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