On-Load Tap Changer Flange Mounting for Compact Transformer Installation

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Solution Overview

Problem

Existing load tap changers for transformers are complex, time-consuming, and unsuitable for compact installation, particularly in smaller transformers.

Innovation Solution

A load tap changer design utilizing a flange module and union nut for attachment to the transformer, allowing easy installation by inserting the flange module through an opening in the housing and securing it with a union nut, which can be threaded or positively locked, and optionally using insulating materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional load tap changer is installed using a tap changer cover screwed onto the transformer cover, then the load tap changer can be securely attached, but the installation becomes time-consuming and complex

Engineering Contradiction:

Improvesecure attachmentVSAvoidinstallation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The load tap changer is divided into modular components: a housing portion that interfaces with the transformer and a flange portion with mounting holes. This segmentation allows the flange to be inserted through the transformer wall from the outside, enabling direct attachment without requiring cover assembly from the inside, thus reducing installation time while maintaining secure attachment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The flange acts as an intermediary element between the load tap changer housing and the transformer structure. The flange extends through the transformer wall and provides external mounting points, serving as a mediator that enables simple external attachment while ensuring secure internal connection

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of stationary object

If a conventional load tap changer with cover assembly is used, then adequate space can be accommodated, but the installation becomes expensive and complex

Engineering Contradiction:

Improveinstallation spaceVSAvoidinstallation complexity

Core Design Contradiction:

Volume of stationary objectVSEase of manufacture

Solution Approach 1:

By segmenting the load tap changer into a housing portion and a separate flange portion, the design enables simple external mounting through the transformer wall. This segmentation reduces installation complexity and cost while maintaining adequate space accommodation through proper positioning of the modular components

Inventive Principle:

Principle #1Segmentation

3Volume of moving object

If a compact load tap changer design is implemented, then space-saving installation is achieved, but the attachment method becomes more complex

Engineering Contradiction:

Improveload tap changer sizeVSAvoidattachment method

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

Instead of attaching the load tap changer from the inside of the transformer (conventional method), the flange is inserted through the wall and attached from the outside. This inversion of the attachment approach simplifies the process to basic external fastening operations, reducing attachment method complexity while enabling compact transformer design

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP4197013B1On-load tap changer and tap-changing transformer having an on-load tap changer

Publication Date: 2025.12.03 MASCHFAB REINHAUSEN GMBH

Figure 1
Figure 2

AI summary

The invention relates to an on-load tap changer (1) for uninterrupted load transfer between different winding taps of a tap-changing transformer (30), comprising a flange module (2) and a union nut (12). The on-load tap changer (1) can be fastened to the tap-changing transformer (30) by means of the union nut (12) and the flange module (2).