Adjustable Door Assembly for Circuit Breaker Seal

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Solution Overview

Problem

The racking process of circuit breakers in switchgear often results in arc flashes, hazardous gases, and explosive forces escaping through gaps between the circuit breaker and the enclosure door, posing safety risks and damage due to misalignment or size discrepancies between older and newer circuit breakers.

Innovation Solution

An adjustable door assembly with an inner floating frame assembly and adjustable couplings that apply force to form a seal between the circuit breaker and the enclosure door, accommodating various gap sizes and maintaining the seal during circuit breaker position transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If circuit breakers are upgraded or replaced with smaller, more compact models, then productivity and modernization are improved, but gaps form between the circuit breaker and enclosure door allowing arc flash and hazardous materials to escape

Engineering Contradiction:

Improvecircuit breaker upgrade efficiencyVSAvoidarc flash exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a flexible sealing system comprising a frame and a flexible barrier that can conform to different circuit breaker sizes. The flexible barrier acts as a thin film that seals gaps between the enclosure door and circuit breaker, preventing arc flash and hazardous material escape while accommodating various breaker dimensions.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sealing system is designed to be dynamic rather than static. The flexible barrier can move and adjust its position to maintain contact with the circuit breaker front surface during racking operations, ensuring continuous sealing despite changes in breaker position or size.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the enclosure door is designed to fit older, larger circuit breakers, then compatibility is improved, but gaps remain when newer, smaller circuit breakers are installed

Engineering Contradiction:

Improveenclosure compatibilityVSAvoidseal alignment

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The sealing system is designed as a universal solution that can accommodate multiple circuit breaker sizes and types. The adjustable frame and flexible barrier configuration allow the same sealing system to work with both older larger breakers and newer smaller breakers, eliminating the need for different seals for different applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The sealing system is divided into separable components including the frame structure and the flexible barrier. This segmentation allows independent adjustment of each component to achieve proper alignment and sealing for different circuit breaker configurations.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If a fixed seal is used between the enclosure door and circuit breaker, then manufacturing simplicity is improved, but the seal cannot accommodate circuit breaker position transitions or size variations

Engineering Contradiction:

Improveseal fabricationVSAvoidposition adjustment range

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The sealing system transitions from a fixed, static design to a dynamic system where the flexible barrier can move and deform. This allows the seal to adapt to circuit breaker position changes during racking operations while maintaining the relative simplicity of the overall structure.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The flexible barrier's physical parameters (shape, position, deformation) can change in response to different circuit breaker configurations. This allows a single seal design to accommodate multiple breaker sizes and positions without requiring complex adjustment mechanisms.

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 adjustable door assembly effectively mitigates exposure to arc flashes, hazardous gases, and explosive forces by forming a consistent seal around the circuit breaker, ensuring operator safety and preventing damage to equipment during transitions and upgrades.

Implementation Method 1

an adjustable coupling configured to apply a force, between the inner floating frame and the inner floating box frame, to the inner floating box frame towards a front side of the circuit breaker to form a seal

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS9502188B2Adjustable door assembly

Publication Date: 2016.11.22 ABB (SCHWEIZ) AG

AI summary

One or more apparatuses are provided for forming a seal between a circuit breaker and an enclosure. An adjustable door assembly includes an inner floating frame assembly positioned according to a floating configuration between a first external flange and a second external flange that connect to an enclosure door of an enclosure housing a circuit breaker. The inner floating frame assembly includes an inner floating frame and an inner floating box frame. An adjustable coupling is used to apply a force, between the inner floating frame and the inner floating frame box, to the inner floating box frame towards a front side of the circuit breaker to form a seal between the front side of the circuit breaker and the enclosure door. The seal may provide a barrier for mitigating arc flash, hazardous gases, material, and/or explosive force from escaping from a backside of the circuit breaker.