GIS With Segmented Circuit Breaker Compartment
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Solution Overview
Problem
Conventional Gas Insulated Switchgear (GIS) requires power supply interruption and gas evacuation for circuit breaker maintenance, disrupting continuous power supply and inefficient in gas usage.
Innovation Solution
A GIS design with a separately independent sealed circuit breaker compartment allows for maintenance and replacement of the circuit breaker unit without interrupting power, using a transfer bus to maintain continuity, and includes a gas duct for arc-generated gas egress, minimizing the size of the gas tank and gas usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the circuit breaker unit is contained in a single sealed container with other components sharing insulating gas, then the GIS structure is simplified, but power supply must be interrupted and gas evacuated for circuit breaker maintenance
Solution Approach 1:
The GIS is divided into separate sealed compartments: a first sealed container housing the circuit breaker unit with its own insulating gas, and a second sealed container housing other components. This segmentation allows independent maintenance of the circuit breaker without affecting other components or requiring complete gas evacuation, thereby improving maintenance efficiency while maintaining overall structural organization.
2Reliability
If a transfer bus configuration is provided for continuity of power, then power supply continuity is improved, but the GIS requires more components and increased spacing
Solution Approach 1:
The transfer bus and associated switches are placed in a separate sealed container from the circuit breaker unit. This allows the transfer bus configuration to provide power continuity through alternate supply paths while maintaining compact packaging within distinct modular compartments, avoiding the need for increased spacing between components.
3Loss of time
If the circuit breaker unit is made withdrawable for quick maintenance, then maintenance time is reduced, but the sealing and gas containment becomes more complex
Solution Approach 1:
The circuit breaker unit is housed in its own sealed compartment with a removable seal, allowing the breaker to be withdrawn for maintenance while the seal can be replaced independently. This segmentation enables quick maintenance access without requiring complex overall sealing mechanisms, as only the local seal at the withdrawal interface needs to be simple and replaceable.
4Loss of substance
If all components share a common insulating gas volume, then gas usage is minimized, but maintenance requires evacuation of the entire gas volume
Solution Approach 1:
The insulating gas is divided into separate sealed compartments, with the circuit breaker unit in one compartment and other components in another. This allows maintenance of the circuit breaker to proceed without evacuating the gas from the other compartment, significantly reducing gas evacuation time and allowing the gas in the second compartment to continue providing insulation and arc extinction for the transfer bus configuration.
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
Enables quick maintenance and replacement of the circuit breaker unit without power disruption, while maintaining gas insulation for alternate supply components, reducing gas consumption and tank size.
Implementation Method 1
SF6 gas which has excellent characteristics for insulating and arc extinction
Implementation Method 2
SF6 gas which has excellent characteristics for insulating and arc extinction
Data Source
AI summary
A GIS (Gas Insulated Switchgear) includes a main bus compartment including a main bus-bar unit, a transfer bus compartment including a transfer bus-bar unit, a sealed circuit breaker compartment including a circuit breaker unit and a load side compartment including a current transforming unit and a transfer bus conductor electrically coupling the transfer bus-bar unit and the current transformer unit. The circuit breaker unit is contained in the sealed circuit breaker compartment being separately independent from other compartments. The transfer bus conductor passes from the transfer bus-bar unit through the load side compartment to the current transformer unit without passing through the circuit breaker compartment. The sealed circuit breaker compartment and the load side compartment do not share insulating gas.