Support Assembly for Electrical Network Protector Switches
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Solution Overview
Problem
Existing electrical systems with network protectors face challenges in safely and reliably removing and installing disconnect switches, which are typically manual and pose safety risks due to the need to handle energized components.
Innovation Solution
A support assembly comprising insulative mounting members, base assemblies with housing and stand components, and a lifting apparatus that allows disconnect switches to be safely installed and removed from network protectors by moving the mounting members transversely, providing a safe and reliable mechanism for handling and isolating electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual support and handling are used to remove disconnect switches from energized bus, then the disconnect switches can be isolated, but safety risks increase due to manual interaction with energized components
Solution Approach 1:
The system uses self-aligning features where the disconnect switch automatically aligns with the bus during insertion and removal, eliminating the need for manual alignment operations with energized components. The cam mechanism automatically engages and disengages contacts during the switching operation.
Solution Approach 2:
A non-conductive support structure serves as an intermediary between the operator and the energized components. This insulating support allows the disconnect switch to be manipulated and positioned without direct manual contact with energized parts, thereby improving safety.
2Productivity
If disconnect switches are manually unbolted from network protector or energized bus, then the switches can be removed, but the operation becomes complex and time-consuming
Solution Approach 1:
The support assembly is divided into modular components including a non-conductive support structure, base assemblies, and lifting apparatus. This segmentation allows each component to perform its specific function independently, simplifying both the overall assembly and the installation/removal operations.
Solution Approach 2:
The disconnect switch is pre-positioned on the non-conductive support structure before approaching the energized bus or network protector. The lifting apparatus is pre-configured to provide the necessary lifting force, so that the actual connection and disconnection operations can be performed quickly without complex manual manipulation during the critical switching phase.
3Extent of automation
If lifting apparatus is added to base assemblies, then automated movement of mounting members is achieved, but device complexity increases
Solution Approach 1:
The lifting apparatus replaces manual mechanical lifting operations with an automated mechanical lifting mechanism. This substitution provides controlled, repeatable movement of the mounting members while eliminating the need for manual positioning and support during the lifting operation.
Solution Approach 2:
The base assemblies serve multiple functions: they provide structural support for the lifting apparatus, serve as mounting points for the disconnect switches, and provide the mechanical interface for the lifting operation. This multi-functionality reduces the need for separate components and minimizes overall system complexity.
Data Source
AI summary
A support assembly is for an electrical system. The electrical system includes a network protector and a number of disconnect switches coupled to the network protector. The support assembly includes: an insulative mounting member coupled to each of the disconnect switches; a number of base assemblies each including a housing assembly and a stand assembly disposed on the housing assembly, the housing assembly being coupled to the insulative mounting member; and a lifting apparatus disposed on each of the base assemblies. The lifting apparatus moves each of the insulative mounting member and the housing assembly in a direction transverse to the stand assembly.