Vacuum Interrupter Contact Assembly for Lower Heat and Flashover Risk

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Solution Overview

Problem

Conventional switching devices face issues with temperature rise, dielectric requirements, and assembly size due to flexible connections in vacuum interrupters, which also pose a risk of dielectric flashovers and require additional space for bolted connections.

Innovation Solution

A switching device with a novel contact arrangement that replaces flexible connections using a rigid contact member, compressible contact member, and heat sink, featuring a compressible contact member with radial flexibility and a heat sink for heat dissipation, ensuring stable electrical engagement and compact assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If flexible connections are used in vacuum interrupters, then electrical contact is maintained during movement, but temperature rise occurs and dielectric flashover risk increases

Engineering Contradiction:

Improveelectrical contact stabilityVSAvoidtemperature rise

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the physical state and material properties of the contact member by making it compressible rather than flexible, and by providing it with radial flexibility through a specific structural configuration (multiple foils arranged radially). This parameter change allows the contact to maintain electrical stability while reducing temperature rise and eliminating dielectric flashover risks associated with conventional flexible connections.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The contact member is constructed as a composite structure comprising multiple conducting foils (such as copper or aluminum) arranged radially and held together by a support structure. This composite configuration provides both electrical conductivity and radial flexibility, resolving the contradiction between maintaining reliable electrical contact and preventing temperature rise.

Inventive Principle:

Principle #40Composite materials

2Reliability

If flexible connections are used in vacuum interrupters, then electrical contact is maintained during movement, but dielectric flashover risk increases

Engineering Contradiction:

Improveelectrical contact stabilityVSAvoiddielectric flashover risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the geometric and structural parameters of the contact member by providing radial flexibility through a multi-foil configuration rather than using conventional flexible connections. This parameter change eliminates sharp edges and irregular surfaces that cause dielectric flashovers, while maintaining reliable electrical contact during vacuum interrupter operation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional contact arrangements are used, then electrical connection is provided, but assembly size increases

Engineering Contradiction:

Improveelectrical connectionVSAvoidassembly size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The contact member is designed with a nested structure where multiple conducting foils are arranged radially within a compact cylindrical configuration, held together by a support structure. This nesting allows the electrical connection components to be packed efficiently, reducing the overall assembly size while maintaining reliable electrical connection.

Inventive Principle:

Principle #7Nested doll (Nesting)

4Adaptability or versatility

If flexible connections are used, then movement accommodation is achieved, but additional space for bolted connections is required

Engineering Contradiction:

Improvemovement accommodationVSAvoidspace for bolted connections

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent changes the flexibility mechanism from conventional flexible connections requiring bolted attachments to a compressible contact member with radial flexibility built into its structure. The multiple radial foils can accommodate movement through their inherent flexibility without requiring additional bolted connection spaces, thus reducing the overall volume required.

Inventive Principle:

Principle #35Parameter changes

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 addresses temperature rise and dielectric stability issues, providing a compact and simplified assembly with improved dielectric strength, reducing the risk of flashovers and enabling efficient heat dissipation.

Implementation Method 1

a heat sink for heat dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a heat sink for heat dissipation

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentEP4235721B1Switching device, vacuum interrupter assembly and method of operating a switching device for electric power distribution

Publication Date: 2026.01.21 SIEMENS AG

Figure 1A~1B
Figure 2
Figure 3

AI summary

A switching device (100) for opening and closing a circuit is provided. The switching device comprises a vacuum interrupter unit (124) with a first stem (126) and a second stem (128). The switching device further comprises a rigid contact member (140) having a slot (142) and a contact arm (144). The switching device further comprises a compressible contact member (150) positioned inside the slot of the rigid contact member. In the switching device, the second stem is configured to move linearly; such that in a first position, the second stem is in electrical engagement with the compressible contact member thereby closing the circuit, and in the second position, the second stem is out of electrical engagement with the compressible contact member thereby opening the circuit.