Shielded Transformer Voltage Impulse Distribution

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Solution Overview

Problem

Existing dielectric test transformers suffer from uncontrolled voltage impulses, leading to potential damage and increased maintenance, repair, and replacement costs due to uneven voltage distribution across winding sections.

Innovation Solution

An optimized shielding transformer with a shaped metallic screen that splits voltage impulses in a uniform capacitive manner across the winding layers, preventing direct interference with the windings and simplifying insulation connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional transformer winding structure is used, then the transformer can operate normally, but voltage impulses are unevenly distributed across winding sections causing potential damage and increased maintenance costs

Engineering Contradiction:

Improvewinding integrityVSAvoidvoltage impulse distribution

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A metallic screen is introduced as an intermediary component between the high voltage winding and the low voltage winding. This screen acts as a mediator that captures and redistributes voltage impulses uniformly across the winding sections through capacitive coupling, preventing direct impulse damage to the winding insulation while maintaining normal transformer operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The metallic screen changes the voltage impulse distribution parameter by introducing a new capacitive division mechanism. The screen's position and geometry are optimized to create uniform voltage distribution across different winding sections, transforming the harmful uneven impulse distribution into a controlled and uniform parameter state.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the metallic screen is positioned closer to the high voltage winding, then better voltage impulse protection is achieved, but the insulation requirements and complexity increase

Engineering Contradiction:

Improvevoltage impulse protectionVSAvoidinsulation structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The metallic screen serves as an intermediary that simplifies the overall insulation structure by providing a dedicated impulse protection layer. Rather than requiring complex insulation arrangements throughout the winding, the screen集中 provides the necessary protection function, reducing overall structural complexity while maintaining reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If traditional insulation methods are used without a metallic screen, then the structure is simpler, but maintenance, repair, and replacement costs increase due to winding damage

Engineering Contradiction:

Improveshielding structureVSAvoidmaintenance cost

Core Design Contradiction:

Device complexityVSEase of repair

Solution Approach 1:

The metallic screen provides beforehand cushioning against voltage impulses by capturing and redistributing impulse energy before it can damage the winding insulation. This preventive protection mechanism reduces the frequency of maintenance, repair, and replacement operations, improving ease of repair over the transformer's lifetime despite the added initial structural complexity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

The solution effectively reduces the risk of winding damage from voltage impulses and minimizes maintenance costs by ensuring uniform voltage distribution and protecting the transformer's integrity.

Implementation Method 1

a shaped screen (8), facing said primary winding (4) and provided with a metallic outer surface (8a) which, in case of need, splits up in a uniform capacitive way on the primary winding (4) a possible voltage impulse

Methodology Applied

Scientific EffectCapacitive voltage division: Capacitance

Data Source

PatentEP2289080B1Optimized shielded transformer, in particular for carrying out dielectric tests

Publication Date: 2015.02.25 S E A SOC ELETTROMECCANICA ARZIGNANESE

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AI summary

An optimized shielding transformer (1), in particular for carrying out dielectric tests, comprising a containment case (2) which is placed on a support structure, a magnetic core (3) positioned inside the containment case (2), a primary winding (4), coupled with the magnetic core (3), and a secondary winding (6) magnetically coupled with the primary winding (4) through the magnetic core (3). The transformer (1 ) includes a shaped protection screen (8), facing the primary winding (4) and provided with a metallic outer surface (8a) which splits up in uniform and capacitive way on the primary winding (4) a possible voltage impulse which affects the shaped screen (8) itself.