Vacuum Switching Device Internal Electrode Actuation

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Solution Overview

Problem

Existing vacuum switching devices face mechanical failure due to wear out of the bellows or diaphragm arrangement, leading to loss of vacuum and insulation failure, especially under high voltage conditions, and require bulky external actuators that complicate design and installation.

Innovation Solution

The design relocates the moving electrode entirely within the vacuum housing, eliminating the need for external moving parts and actuators, allowing for self-actuation and simplifying the mechanical design, installation, and maintenance by using a permanent magnet actuator or other mechanisms within the housing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a bellows or diaphragm arrangement is used to permit stem movement without breaking the vacuum seal, then the switching device can operate mechanically, but the bellows wear out after multiple actuations leading to vacuum loss and insulation failure

Engineering Contradiction:

Improvemechanical operationVSAvoidvacuum seal integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention extracts the moving electrode from the vacuum envelope, allowing it to move externally while the vacuum seal remains intact. This eliminates the bellows component that caused wear and vacuum loss, resolving the contradiction between mechanical operation and vacuum seal integrity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary to transfer the actuating force from the external actuator to the moving electrode without mechanical contact through the vacuum boundary. This magnetic coupling enables reliable operation while maintaining vacuum integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple vacuum interrupters are used in a three phase circuit with a single actuator, then the switching device can control multiple circuits, but the actuator becomes large and requires additional components or multiple connections

Engineering Contradiction:

Improvemulti-circuit controlVSAvoidactuator structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The moving electrode is designed to perform multiple functions: it acts as both the actuating element for the vacuum interrupter and the electrical contact for circuit switching. This multi-functionality eliminates the need for separate actuators for each circuit, reducing overall device complexity while maintaining adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Volume of moving object

If Thomson coil actuators are used to generate actuation force through eddy currents, then the device can be compact, but the force is too low for alternating current and medium voltage regimes and cannot sustain latching

Engineering Contradiction:

Improveactuator sizeVSAvoidactuation force

Core Design Contradiction:

Volume of moving objectVSForce

Solution Approach 1:

The patent replaces the Thomson coil electromagnetic actuation mechanism with a permanent magnet-based magnetic field system. This substitution provides sufficient and sustainable actuation force for medium voltage applications while maintaining compact dimensions, and enables reliable latching functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution enhances the reliability and longevity of vacuum switching devices by reducing mechanical stress, eliminating the risk of external actuator failure, and simplifying the switchgear design, while maintaining reliable operation under alternating current and medium voltage conditions.

Implementation Method 1

an actuator for moving the first electrode relative to the second electrode to mechanically engage and disengage the electrodes

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

using a permanent magnet actuator or other mechanisms within the housing

Methodology Applied

Scientific EffectMagnetism: Magnetism

Implementation Method 3

a vacuum evacuated housing; first and second electrodes within the housing

Methodology Applied

Scientific EffectVacuum insulation: Vacuum

Data Source

PatentUS10600593B2Vacuum switching devices

Publication Date: 2020.03.24 S&C ELECTRIC CO

AI summary

An alternating current vacuum switching device for switching an electrical circuit under load and no load conditions, and optionally short-circuit conditions is disclosed. The switching device comprises: a vacuum evacuated housing; first and second electrodes within the housing; and an actuator for moving the first electrode relative to the second electrode to mechanically engage and disengage the electrodes to perform a switching function, wherein the first electrode is wholly located within the vacuum evacuated housing such that movement of the switching function occurs solely within the housing. By having movement of the switching function solely within the housing, the reliability of the vacuum switching device is improved.