Switchgear Bus Enclosure Layout for Phase Fault Isolation

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Solution Overview

Problem

Medium voltage switchgear arrangements are prone to phase-to-phase faults due to close proximity of bus sections for different phases, which can lead to devastating electrical failures.

Innovation Solution

The implementation of bus enclosure arrangements with insulated bus sections and air gaps between grounded or insulating walls of tubular enclosures, providing enhanced isolation between phases and reducing the likelihood of such faults. The bus sections include an inner conductor, inner and outer insulation layers, and an outer shield conductor, connected via connectors to gas-insulated switches.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If bus sections for different phases are placed in close proximity to reduce switchgear size, then the compactness of the switchgear is improved, but the risk of phase-to-phase faults increases

Engineering Contradiction:

Improveswitchgear sizeVSAvoidphase-to-phase fault risk

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The bus enclosure is divided into multiple isolated compartments, each containing bus sections for different phases. These compartments are separated by insulating walls or barriers, physically segmenting the phases to prevent fault propagation while maintaining compact overall dimensions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Insulating barriers or dielectric materials are introduced as intermediaries between bus sections of different phases. These intermediaries provide electrical isolation while allowing the bus sections to remain in close proximity, thus maintaining compactness while preventing phase-to-phase faults.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If gas-insulated components are used to reduce spacing between components, then the compactness of the switchgear is improved, but the complexity of the gas containment system increases

Engineering Contradiction:

Improveswitchgear sizeVSAvoidgas containment system complexity

Core Design Contradiction:

Volume of moving objectVSDevice complexity

Solution Approach 1:

The gas insulation system is segmented into separate enclosed compartments, each containing specific high-voltage components. This segmentation allows each compartment to be independently sealed and pressurized, reducing the overall complexity of the gas containment system while maintaining compact dimensions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulation properties are enhanced by controlling parameters such as gas pressure and composition within the enclosed compartments. By adjusting these parameters, the spacing between components can be reduced while maintaining adequate insulation, thus achieving compactness without excessive system complexity.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If insulating coverings are added to bus sections to enhance phase isolation, then the reliability against phase-to-phase faults is improved, but the device complexity increases

Engineering Contradiction:

Improvephase isolationVSAvoidbus assembly structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Thin-film insulating coverings or coatings are applied to the bus sections to provide phase isolation. These thin films provide adequate electrical insulation without significantly increasing the overall dimensions or structural complexity of the bus assembly, while effectively preventing phase-to-phase faults.

Inventive Principle:

Principle #30Flexible shells and thin films

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 effectively reduces the occurrence of phase-to-phase faults by enhancing isolation between phases, ensuring reliable operation of medium voltage switchgear units.

Implementation Method 1

air gap between the tubular enclosures

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Implementation Method 2

separated by an air gap

Methodology Applied

Scientific EffectElectrical isolation: Physical Containment

Implementation Method 3

reduced spacing between components and thus enable relatively compact arrangement

Methodology Applied

Scientific EffectHigh-dielectric insulation: Dielectric

Data Source

PatentUS12184044B2Isolating bus enclosure arrangements for switchgear

Publication Date: 2024.12.31 EATON INTELLIGENT POWER LTD

AI summary

A switchgear assembly includes a plurality of gas insulated switches arranged in at least one row and a plurality of enclosures arranged in at least one row forming at least one channel extending parallel to the at least one row of switches. The switchgear assembly further includes at least one bus assembly disposed in the at least one channel and including a plurality of interconnected bus sections having an insulating covering and electrically connected to the gas insulated switches.