Test Port Cover Retention in Electrical Switching Apparatus

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Solution Overview

Problem

Existing electrical switching apparatuses, such as circuit breakers, face challenges in reliably maintaining test port cover members on their covers, as they can be easily ejected during tripping conditions, posing safety risks and requiring improved mechanisms to secure these covers.

Innovation Solution

A maintaining system comprising a test port cover member with plate and leg portions, and an insert that engages the leg portions to prevent deflection, ensuring the cover remains securely attached to the apparatus even under tripping conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If test port cover members are used to block thru holes in electrical switching apparatus covers, then user protection from arcing energies is improved, but the cover members can be easily ejected during tripping conditions

Engineering Contradiction:

Improvetest port cover member retentionVSAvoidejection during tripping

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The test port cover member is divided into a plate portion and separate leg portions that extend into the interior of the electrical switching apparatus. This segmentation allows the legs to be positioned strategically to engage with internal structures, providing secure retention while maintaining protection function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The leg portions of the test port cover member are nested within the interior space of the electrical switching apparatus cover, engaging with internal structures. This nesting approach secures the cover member in place during tripping conditions while allowing it to effectively block the thru hole from the exterior.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If simple test port cover members are used to block thru holes, then manufacturing simplicity is improved, but reliable maintenance on the cover is compromised

Engineering Contradiction:

Improvecover member simplicityVSAvoidcover member retention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of attempting to secure the cover member from the exterior side, the leg portions extend into the interior of the apparatus to engage with internal structures. This inverted approach to securing provides reliable retention while keeping the exterior surface simple for manufacturing.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS10665408B2Electrical switching apparatus, maintaining system therefor, and associated maintaining method

Publication Date: 2020.05.26 EATON INTELLIGENT POWER LTD

AI summary

A maintaining system is for an electrical switching apparatus. The electrical switching apparatus includes an electrical switching apparatus cover having an edge portion defining a thru hole. The maintaining system includes a test port cover member and an insert. The test port cover member is structured to be coupled to the edge portion. The test port cover member has a plate portion and a pair of opposing leg portions extending from the plate portion. The leg portions are structured to extend into an interior of the electrical switching apparatus and engage the electrical switching apparatus cover. The insert extends through the plate portion. The insert is structured to engage each of the leg portions in order to prevent the leg portions from deflecting toward each other, thereby maintaining the test port cover member on the electrical switching apparatus cover.