Switchgear Arc Eliminator Segmentation for Hot Maintenance
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Solution Overview
Problem
Existing switchgear systems face significant economic losses and safety risks due to arc faults, as they require shutting down the upstream circuit breaker for maintenance of the arc eliminator, which complicates installation and maintenance, especially when the arc eliminator is connected directly to the bus bar, limiting its accessibility and increasing the risk of further damage.
Innovation Solution
A switchgear structure with an arc eliminator that allows for maintenance and repair in a pushing and pulling manner, featuring a relay system that automatically detects arc faults and operates the arc eliminator to earth the bus bar, combined with a cradle conveyer mechanism for easy installation and removal, enabling operation without powering off the switchgear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arc eliminator is connected directly to the bus bar, then the arc elimination function is effective, but the maintenance requires shutting down the upstream circuit breaker and complicates installation
Solution Approach 1:
The switchgear is divided into modular compartments including a bus bar compartment, circuit breaker compartment, and arc eliminator compartment. The arc eliminator is housed in its own separate compartment with independent access, allowing maintenance without shutting down the entire system or accessing the bus bar directly.
Solution Approach 2:
A dedicated arc eliminator compartment acts as an intermediary space between the bus bar compartment and the external environment. This compartment allows the arc eliminator to be connected to the bus bar electrically while providing physical separation for safe and convenient maintenance access.
2Ease of manufacture
If the arc eliminator is installed at the upper portion of the bus bar compartment, then the connection is direct, but the installation space requirements increase and relocation becomes complex
Solution Approach 1:
Instead of placing the arc eliminator vertically above the bus bar (vertical dimension), the design uses a lateral compartment arrangement where the arc eliminator compartment is positioned adjacent to the bus bar compartment (horizontal dimension). This dimensional shift optimizes space utilization and simplifies installation.
3Ease of repair
If the upstream circuit breaker is opened for arc eliminator maintenance, then the arc eliminator can be accessed, but all load sides are powered off causing operational loss
Solution Approach 1:
The electrical system is segmented into independent compartments with isolated maintenance access. The arc eliminator compartment can be opened and the arc eliminator removed for maintenance without opening the upstream circuit breaker, as the compartment design allows safe disconnection and removal procedures.
Solution Approach 2:
The arc eliminator is pre-configured with quick-connect terminals and a standardized removal procedure. Before maintenance is needed, the system is already designed to allow rapid disconnection of the arc eliminator from the bus bar through the compartment interface, enabling hot-swappable maintenance without system shutdown.
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 configuration minimizes economic losses by preventing arc faults and allowing for maintenance without shutting down the switchgear, reducing the risk of further damage and ensuring continuous operation during repairs, thus enhancing safety and efficiency.
Implementation Method 1
an optical sensor installed near the switchgear immediately detects the generated arc fault
Implementation Method 2
The fault current is discharged through the earthing operation and thus the arc is automatically eliminated at the fault-generated point
Data Source
Figure 1
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AI summary
The present invention relates to a structure of a switchgear with an arc protection system including an arc optical sensor to detect an arc, a relay to determine an occurrence or non-occurrence of a fault current by receiving an arc signal detected by the arc optical sensor, and an arc eliminator to earth an arcgenerated side bus bar in response to an operating signal with respect to the determined fault current, wherein the arc eliminator has a test position or a service position within the switchgear.