Sealed Operating Mechanism for Gas-Insulated Switchgear

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Operating mechanisms in gas-insulated switchgear are vulnerable to contamination and require frequent inspection and maintenance, undermining the low-maintenance benefits of compact gas-insulated designs.

Innovation Solution

The switchgear unit incorporates sealed compartments for operating mechanisms filled with dielectric or inert gases, with mechanical linkages and electrical connections sealed to minimize exposure to the ambient environment, allowing separate access and reduced maintenance needs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If operating mechanisms are placed in open air for easy access and operation, then ease of operation is improved, but contamination from the ambient environment increases maintenance requirements

Engineering Contradiction:

Improveaccess to operating mechanismVSAvoidcontamination resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The switchgear is divided into separate sealed compartments: the operating mechanism compartment and the gas-insulated compartment. This segmentation allows the operating mechanism to be isolated from the ambient environment while maintaining separate access capabilities, resolving the contradiction between ease of operation and contamination resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The operating mechanism compartment is filled with an inert or low-reactivity gas (such as nitrogen) to create a protected atmosphere that prevents contamination and corrosion. This inert environment shields the operating mechanism from harmful ambient factors while allowing it to remain accessible for operation and maintenance.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Reliability

If operating mechanisms are sealed in closed compartments, then contamination resistance is improved, but accessibility for maintenance and operation deteriorates

Engineering Contradiction:

Improvecontamination resistanceVSAvoidaccess to operating mechanism

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The operating mechanism is nested within a sealed compartment that is itself contained within the overall switchgear structure. This nested configuration allows multiple levels of protection and access: the outer shell provides structural containment, while the inner sealed compartment protects the mechanism, yet both can be accessed through designed interfaces without compromising the seal.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Bellows or flexible seals serve as intermediaries that connect the sealed operating mechanism compartment to the external environment while maintaining the seal. These intermediaries allow mechanical linkages and actuator members to extend through the compartment wall for operation and maintenance access without breaching the protective seal.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of moving object

If compact gas-insulated design is used, then space efficiency is improved, but operating mechanisms become vulnerable to contamination requiring frequent maintenance

Engineering Contradiction:

Improveswitchgear compactnessVSAvoidmaintenance frequency

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The switchgear is segmented into distinct sealed compartments, with the operating mechanism isolated in its own protected space. This segmentation maintains the compact gas-insulated design while preventing contamination of the operating mechanism, thereby reducing maintenance frequency without sacrificing compactness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The operating mechanism compartment is filled with an inert gas environment that prevents contamination and corrosion. This protective atmosphere allows the mechanism to operate reliably in the compact sealed space without requiring frequent maintenance, resolving the contradiction between compact design and maintenance requirements.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 design reduces maintenance requirements for operating mechanisms, maintaining the compact and low-maintenance advantages of gas-insulated switchgear by isolating them from the ambient environment and allowing separate access, thereby enhancing reliability and reducing contamination risks.

Implementation Method 1

a first sealed compartment configured to contain a dielectric gas and a circuit interrupter in the first sealed compartment

Methodology Applied

Scientific EffectDielectric insulation: Dielectric

Implementation Method 2

the actuator member may pass through a bellows mounted adjacent the wall

Methodology Applied

Scientific EffectFlexible sealing: Elasticity

Data Source

PatentUS10325738B2Gas-insulated switchgear with sealed operating mechanisms

Publication Date: 2019.06.18 EATON INTELLIGENT POWER LTD

AI summary

A switchgear unit includes a gas-insulated compartment and a circuit interrupter in the gas-insulated compartment and mounted on a wall thereof, the circuit interrupter having an actuator rod extending through the wall and outside of gas-insulated compartment. The switchgear unit further includes a sealed operating mechanism compartment adjacent the gas-insulated compartment and having an operating mechanism therein that engages the actuator rod. The circuit interrupter may be included in a vacuum circuit interrupter assembly having a base mounted to the wall and including a bellows through which the actuator rod passes.