Switchgear Finger-Cluster Connector for Heat and Partial Discharge
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Solution Overview
Problem
Current switchgear designs face challenges in efficiently managing heat dissipation, minimizing partial discharge, and optimizing space usage while meeting high current ratings and seismic requirements, particularly in medium voltage applications.
Innovation Solution
The design incorporates a metal-clad switchgear assembly with optimized conductor and bus bar configurations, enhanced ventilation systems, and a connector assembly featuring a finger cluster with garter springs and a runback for improved thermal management and reduced partial discharge, along with seismic reinforcement and insulating materials for compact and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional switchgear designs are used, then standard current ratings are achieved, but the equipment occupies larger space and has less efficient thermal management
Solution Approach 1:
The switchgear is divided into separate compartments (breaker compartment, bus compartment, cable compartment) with dedicated ventilation paths for each, allowing optimized thermal management in each segment while maintaining compact overall dimensions
Solution Approach 2:
Vertical ventilation channels are implemented to utilize the vertical dimension for heat extraction, with vents positioned at top and bottom of compartments to create thermal convection currents that improve cooling efficiency without increasing horizontal footprint
2Reliability
If conventional connector designs are used, then basic electrical connection is achieved, but partial discharge occurs and thermal management is inefficient
Solution Approach 1:
Circular plates are introduced as intermediary components between conductors and fingers, providing uniform electrical stress distribution and preventing partial discharge initiation at connection points
Solution Approach 2:
Multiple fingers connected through circular plates create equipotential surfaces that equalize electrical potential across the connector, eliminating potential differences that would cause partial discharge
3Loss of energy
If standard ventilation systems are used, then basic cooling is provided, but heat dissipation efficiency is insufficient for high current applications
Solution Approach 1:
Ventilation openings are positioned to utilize natural thermal convection, where hot air rises and exits through top vents while cooler air enters through bottom vents, creating self-sustaining airflow without mechanical fans or active cooling systems
Solution Approach 2:
Different ventilation characteristics are provided for different compartments based on their specific thermal loads, with the breaker compartment receiving optimized airflow paths separate from the bus compartment
4Volume of moving object
If compact design is implemented, then smaller footprint is achieved, but seismic resistance may be compromised
Solution Approach 1:
Seismic reinforcement elements are integrated into the existing structural framework of the switchgear, combining structural support functions with seismic resistance without requiring separate reinforcement systems that would increase footprint
Solution Approach 2:
The enclosure utilizes composite construction with steel framing and engineered panels that provide high strength-to-weight ratio, achieving seismic resistance in a compact form factor
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 solution enables higher performance in a smaller footprint, effectively managing heat dissipation, reducing partial discharge, and meeting high current ratings and seismic requirements, resulting in a more compact and efficient switchgear assembly for medium voltage applications.
Implementation Method 1
first and second garter springs which are arranged around the plurality of fingers in respective first and second exterior grooves of the plurality of fingers to apply a force against the plurality of fingers
Implementation Method 2
The runback can include a plurality of open ventilation areas at the other one of the first and second runback ends
Data Source
AI summary
A connector assembly is provided for facilitating live connection of equipment in a switchgear. The assembly includes two circular plates, and conductive fingers which are arranged and spaced apart around the two plates to form a finger cluster with first open-end on a first cluster end and second open-end on an opposite second cluster end. Each open-end can receive a conductor therein. Each finger can include a first finger end and an opposite second finger end which form respective first and second cluster ends; two first interior grooves which are spaced-apart on an interior surface to receive a portion of respective plates; and first and second exterior grooves on an exterior surface around the first and second finger ends respectively. The assembly also includes first and second garter springs which are arranged around the fingers in respective first and second exterior grooves to apply a force against the fingers.