Pin-Isolator for Transformer Taps

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Solution Overview

Problem

Dry-type transformers with externally grounded shielding face space constraints when routing connections and taps, often requiring taps to be positioned on the opposite side due to geometric limitations, which can lead to installation issues.

Innovation Solution

A feedthrough system that routes both connections and taps through a common circular-cylindrical post insulator with an additional inner conductor for taps, ensuring electrical separation and using a disc-shaped shielding ring for enhanced insulation, allowing for a more compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate support insulators are used for connections and taps, then electrical separation is ensured, but space requirements increase and installation flexibility decreases

Engineering Contradiction:

Improveelectrical separationVSAvoidspace requirements

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent combines multiple support insulators into a single integrated support insulator structure. The connection inner conductor and tap inner conductor are routed through the same support insulator body, which provides both mechanical support and electrical insulation. This merging reduces the total number of insulator components and the space they occupy while maintaining the necessary electrical separation through internal insulation design.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a nested configuration where the tap inner conductor is positioned within or alongside the connection inner conductor path through the support insulator. The insulating material is arranged to provide electrical separation between the conductors while they pass through the same insulator body, creating a space-efficient nested arrangement that maintains electrical isolation.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Area of stationary object

If taps are positioned on the opposite side from connections, then geometric space is accommodated, but installation complexity increases and adaptability decreases

Engineering Contradiction:

Improvespace accommodationVSAvoidinstallation flexibility

Core Design Contradiction:

Area of stationary objectVSAdaptability or versatility

Solution Approach 1:

The patent resolves the spatial conflict by transitioning from a two-dimensional opposite-side arrangement to a three-dimensional configuration within the support insulator. Multiple inner conductors (connection and tap conductors) are routed through the same insulator body at different spatial positions and angles, allowing connections and taps to be accessed from the same side while maintaining electrical separation through the insulator's internal structure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If multiple separate support insulators are used for taps and connections, then electrical isolation is maintained, but device complexity increases

Engineering Contradiction:

Improveelectrical isolationVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple separate support insulator components into a single integrated support insulator. This single insulator structure houses both the connection inner conductor and tap inner conductor pathways, providing all necessary electrical isolation functions in one component. This reduces the total component count, simplifies assembly, and lowers device complexity while maintaining reliable electrical isolation through internally arranged insulating material.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration achieves significant space savings, enabling the transformer to be more flexible in installation and adaptable to different voltage requirements while maintaining electrical integrity.

Implementation Method 1

The support insulator is made of an insulating material and features an opening through which the connection inner conductor and the tap inner conductor extend in a common longitudinal direction, electrically separated from one another by the support insulator

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

using a disc-shaped shielding ring for enhanced insulation

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Data Source

PatentEP3001433B1Pin-isolator adapted for a transformer

Publication Date: 2023.05.24 SIEMENS ENERGY GLOBAL GMBH & CO KG

Figure 1~2
Figure 3

AI summary

A feedthrough system (1) for connecting a dry-type transformer (38) with an external grounded shield (40), comprising a substantially circular cylindrical support insulator (2) with a through-line connection conductor (4) for routing the connection through the shield (40), is intended to allow the use of taps in a particularly space-saving design of a dry-type transformer. For this purpose, the support insulator (2) has a through-line tap conductor (5) for routing a tap through the shield (40).