Switchgear Pressure Relief with Bulkhead Gas Diversion
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Solution Overview
Problem
In medium-voltage switchgears with fuse compartments below the container, internal arc faults cause hot gases to escape into the fuse compartment, posing a safety risk to operating personnel when accessing the fuse room.
Innovation Solution
Incorporating a pressure relief device with a bulkhead element that diverts escaping gases away from the fuse compartment, either downward through a discharge channel or laterally, ensuring gases do not enter the fuse space during operations or maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief device is arranged to relieve pressure downward towards the ground, then the overpressure inside the container can be relieved effectively, but hot gases escape into the fuse compartment below, creating a safety hazard for operating personnel
Solution Approach 1:
A bulkhead element is introduced as an intermediary structure between the pressure relief device and the fuse compartment. This bulkhead acts as a mediator that redirects the hot gases away from the fuse compartment while maintaining the pressure relief function, thus protecting operating personnel without compromising the pressure relief effectiveness
Solution Approach 2:
The solution changes the spatial arrangement by introducing a bulkhead element that creates a new dimensional barrier. The bulkhead redirects the gas flow from a direct downward path into the fuse compartment to a redirected path that bypasses the fuse compartment, effectively using spatial reconfiguration to solve the hazard problem
2Device complexity
If the fuse compartment is positioned directly below the container, then the switchgear structure becomes compact and economical, but operating personnel are exposed to hot gases when accessing the fuse room during faults
Solution Approach 1:
The bulkhead element serves as an intermediary partition that allows the fuse compartment to remain directly below the container for compactness, while simultaneously protecting personnel by redirecting hot gases away from the access area
Solution Approach 2:
The bulkhead element segments the space between the pressure relief device and the fuse compartment, creating distinct zones that allow the compact vertical arrangement while preventing harmful gas migration to the personnel access area
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 significantly enhances operational safety by preventing gases from escaping forward, allowing safe access to the fuse room during faults and maintaining a compact, cost-effective structure.
Implementation Method 1
a predetermined breaking point which is integrated into the outer skin of the gas-insulated container. This predetermined breaking point is used to relieve the high overpressure that can occur inside the container in the event of an arc fault inside the container.
Implementation Method 2
An electric arc is associated with a strong heating of the gas to several 1000 °C and thus a strong pressure increase to several bar within a few 10 milliseconds.
Implementation Method 3
An electric arc is associated with a strong heating of the gas to several 1000 °C
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a switchgear system (1), especially a medium voltage switchgear system comprising a plurality of switchgears, cable connections (32) and/or bus bars which are arranged in a switchgear cabinet (2), the one or more switchgears being arranged in a metal-encapsulated container (10), which is filled with an insulating gas, on top of a plurality of fuse cartridges (20) having fuse elements (16). The container (10) is provided with at least one pressure relief device (24) having a predetermined direction of relief (R), the fuse cartridges (20) being associated with at least one bulkhead element (22.1 to 22.n) on at least one side facing the direction of relief (R).