Dual-Contactor Panelboard Assembly for Selective Load Isolation
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Solution Overview
Problem
Conventional heavy-duty electrical panelboard assemblies require multiple enclosures and contactors, leading to increased footprint and cost, and do not allow for selective switching of loads during maintenance, posing safety risks in harsh and hazardous environments.
Innovation Solution
A panelboard assembly with dual contactor assemblies integrated into a single enclosure, allowing for simultaneous switching of separate groups of loads and reducing the need for additional enclosures, while maintaining safety certifications for hazardous locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate panelboards with individual contactors are used to feed different loads, then selective switching of loads is enabled, but the footprint and installation cost increase
Solution Approach 1:
The patent combines multiple contactor assemblies (first and second contactor assemblies) into a single integrated panelboard enclosure, eliminating the need for separate panelboards. Each contactor assembly can independently control different groups of loads, maintaining selective switching capability while reducing the overall footprint to one enclosure instead of multiple separate units.
Solution Approach 2:
The single panelboard enclosure serves multiple functions by housing both the first and second contactor assemblies, each capable of independent load control. This multi-functional design allows the system to provide selective switching for different load groups within one unified structure, replacing what would traditionally require multiple specialized panelboards.
2Reliability
If all loads are switched off via a single contactor for safety during maintenance, then safety is improved, but the ability to operate certain loads during maintenance is lost
Solution Approach 1:
The patent segments the load control into multiple independent contactor assemblies, where the first contactor assembly controls a first group of loads and the second contactor assembly controls a second group of loads. This segmentation allows selective isolation of specific load groups during maintenance while keeping other load groups operational, enhancing both safety and operational flexibility.
Solution Approach 2:
The system provides dynamic control capabilities by allowing different contactor assemblies to be actuated independently based on maintenance requirements. Operators can selectively deactivate only the contactor assembly corresponding to the loads being serviced, while maintaining power to other load groups, enabling adaptive safety measures tailored to specific maintenance scenarios.
3Reliability
If one enclosure per contactor assembly is used, then each contactor is properly enclosed and protected, but the number of enclosures and installation cost increase
Solution Approach 1:
The patent merges multiple contactor assemblies into a single common enclosure, eliminating the need for separate enclosures for each contactor. The unified enclosure provides appropriate protection and housing for all contactor assemblies while reducing the total number of enclosures from multiple separate units to one integrated structure, simplifying installation and reducing costs.
Data Source
AI summary
A panelboard assembly includes a plurality of subpanel assemblies and three power distribution blocks (PDBs). Each of the subpanel assemblies includes a branch breaker assembly electrically connected to a three-phase power supply and configured to be electrically connected to a group of loads. The branch breaker assembly includes a plurality of branch circuit breakers, each configured to switch on or off an electrical connection to a respective one or more loads in the group of loads. Each of the three PDBs is associated with a phase of the three-phase power supply. The three PDBs are disposed downstream of the power supply and upstream of the breaker assembly of each of the plurality of subpanel assemblies. Each PDB is configured to receive electrical power through a single bus and distribute the received electrical power to the branch breaker assembly of each of the plurality of subpanel assemblies via separate buses.