Gas Circuit Breaker Insulation Shield for Particle Containment

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Solution Overview

Problem

Conductive particles generated during the breaking operation in double-break gas circuit breakers can adhere to the insulation support cylinder, deteriorating the dielectric strength and potentially causing breakdown, especially due to the flow of high temperature and high pressure exhaust gas containing these particles into the insulation support cylinder.

Innovation Solution

The implementation of an electric field relaxation shield with an outside and inside groove part, which acts as a particle trap, is used to prevent conductive particles from flowing into the insulation support cylinder by capturing them and reducing their scattering risk, thereby maintaining insulation performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a link mechanism is used to transmit drive force from the actuator to the movable parts of the breaking sections, then the breaking operation can be transmitted effectively, but conductive particles are generated at the sliding section and may adhere to the insulation support cylinder, deteriorating dielectric strength

Engineering Contradiction:

Improvebreaking operation transmission efficiencyVSAvoiddielectric strength

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

An electric field relaxation shield is introduced as an intermediary component between the link mechanism and the insulation support cylinder. This shield captures conductive particles generated during breaking operations before they can adhere to the insulation support cylinder, thereby maintaining dielectric strength while allowing the link mechanism to continue transmitting drive force effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electric field relaxation shield utilizes the natural flow of exhaust hot gas and conductive particles to carry these particles into the shield's interior space, where they are captured and contained. The harmful particle flow is converted into a beneficial containment mechanism, preventing particle adhesion to critical insulation components.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Power

If the breaking sections are oppositely arranged to break heavy-current at high speed, then the breaking capacity is improved, but the exhaust hot gas flows oppositely and mixes around the operating link mechanism, causing conductive particles to flow into the insulation support cylinder

Engineering Contradiction:

Improvebreaking capacityVSAvoidparticle adhesion to insulation support cylinder

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The electric field relaxation shield serves as a protective intermediary that intercepts the mixed exhaust hot gas and conductive particles from the oppositely arranged breaking sections. By positioning the shield between the breaking sections and the insulation support cylinder, it prevents particles from reaching the insulation component while allowing the high-capacity breaking operation to continue.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electric field relaxation shield extracts and separates conductive particles from the exhaust hot gas flow before the particles can adhere to the insulation support cylinder. The shield's interior space acts as a collection zone, removing harmful particles from the gas flow path.

Inventive Principle:

Principle #2Taking out (Extraction)

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 effectively prevents the adhesion of conductive particles on the insulation support cylinder, enhancing the reliability of gas circuit breakers by ensuring the insulation performance is maintained and preventing potential breakdowns.

Implementation Method 1

the electric field relaxation shield with a function of a particle trap

Methodology Applied

Scientific EffectParticle trapping: Absorption (physical)

Implementation Method 2

an out-side groove part and an in-side groove part on out-side and in-side of the insulation cylinder respectively

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS8957341B2Gas circuit breaker

Publication Date: 2015.02.17 HITACHI ENERGY LTD

AI summary

A gas circuit breaker comprising: a sealed tank; two breaking sections disposed in the sealed tank; a bracket to support movable parts of the breaking sections while enabling switching operation of the movable parts; an insulation cylinder to support the bracket through an electric field relaxation shield; an insulated operating rod disposed in the insulation cylinder movably in the axial direction and an end thereof is connected to an actuator; and a link mechanism connected to other end of the insulated rod and transmits drive force from the actuator to the movable parts of the breaking sections, wherein the electric field relaxation shield is provided with out-side groove and in-side groove on the insulation cylinder respectively, and the out-side groove and in-side groove are formed openings at the link mechanism side respectively, and end of the in-side groove is extended to near the outer surrounding of the insulated operating rod.