Modular Fan Module Chimney Cooling for Switchgear Disconnects
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Solution Overview
Problem
Low voltage switchgear assemblies face challenges in managing increased heat generation due to higher current ratings, as natural convection cooling is insufficient to maintain temperature limits set by ANSI standard C37.50 without increasing the physical size of the power circuit breaker or switchgear footprint.
Innovation Solution
A cabinet structure with a fan module that draws outside air through an air passageway over primary disconnects of the power circuit breaker, enhancing cooling efficiency to maintain temperature within ANSI standards without enlarging the equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If natural convection cooling is used, then the switchgear can operate without additional cooling components, but the cooling capacity is insufficient to maintain temperature limits at 6000 ampere current ratings
Solution Approach 1:
The cooling system utilizes the existing air passageways and natural airflow paths within the switchgear cabinet structure. The fan module integrates with the cabinet's existing ventilation openings, allowing the system to cool itself using minimal additional components while maintaining compliance with ANSI temperature limits at 6000 ampere ratings
Solution Approach 2:
The fan module is designed as a separate, extractable component that can be removed and installed independently within the cabinet structure. This modular approach allows the cooling capability to be added without redesigning the entire switchgear assembly, resolving the contradiction by providing enhanced cooling capacity while keeping the overall device complexity manageable through component-level modification
2Temperature
If the physical size of the power circuit breaker or switchgear footprint is increased to accommodate additional heat generation, then more cooling capacity is available, but the equipment occupies more space
Solution Approach 1:
The invention changes the cooling method parameter from passive natural convection to active forced convection by introducing the fan module. This parameter change enables sufficient cooling capacity at 6000 ampere ratings without increasing the physical dimensions of the switchgear cabinet or circuit breaker, as the enhanced airflow efficiency compensates for the compact size
3Power
If 6000 ampere continuous current rating is implemented, then the switchgear handles higher power loads, but heat generation increases by approximately 44%
Solution Approach 1:
The invention converts the harmful effect of increased heat generation into a beneficial cooling airflow pattern. The fan module is positioned to draw air through the air passageway in a direction that maximizes heat removal from the primary disconnects, effectively transforming the thermal challenge of 6000 ampere operation into an optimized cooling flow regime that maintains temperature compliance
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 fan module effectively cools the primary disconnects, ensuring the switchgear assembly operates within temperature limits set by ANSI standard C37.50, even at increased current ratings, without increasing the physical size of the equipment.
Implementation Method 1
a fan module having at least one fan for drawing outside air through the lower vent, the air passageway and the primary disconnects for cooling the primary disconnects
Data Source
AI summary
A cabinet structure for a switchgear assembly. The cabinet structure includes a cabinet having upper and lower vents and a breaker cradle for holding a circuit breaker having primary disconnects for connecting the circuit breaker to bus bars. The cabinet further includes an air passageway located between the upper and lower vents, wherein the air passageway extends vertically through the primary disconnects and the cabinet. Further, the cabinet includes a fan module having at least one fan for drawing outside air through the lower vent, the air passageway and the primary disconnects for cooling the primary disconnects.