Removable Contactor Drawer for Mining Power Safety
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Solution Overview
Problem
The repair of electrical power distribution systems in mining environments is challenging due to their remote and hazardous location, making it difficult to replace defective equipment without interrupting operations and risking safety, as technicians must perform repairs in harsh conditions with equipment often being inoperable for extended periods.
Innovation Solution
A removable contactor drawer system with a modular design, featuring a fixed casing and a transitional chamber that supports vacuum contactors and power connectors, allowing for easy replacement of defective components like fuses, and enabling remote operation to minimize downtime and safety risks through an observation window for visual confirmation and remote actuation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If repairs are performed in the mining environment, then equipment can be maintained in place, but technician safety is compromised and repair quality deteriorates due to harsh conditions
Solution Approach 1:
The contactor drawer is divided into separable components that can be removed as a complete unit from the power distribution system. The drawer includes a removable front panel with observation window, allowing the entire assembly to be extracted and replaced without disturbing other system components, enabling safe off-site repair while maintaining system integrity.
Solution Approach 2:
The removable drawer acts as an intermediary component between the power distribution system and the vacuum contactor. It provides a standardized interface with bus bar connectors and mounting mechanisms, allowing the contactor to be serviced by simply replacing the drawer unit rather than working directly with the hazardous energized system.
2Ease of repair
If equipment is evacuated for repair, then repair quality improves in a controlled environment, but productivity decreases due to extended downtime
Solution Approach 1:
The contactor drawer is designed as a self-contained modular unit that can be quickly removed and replaced. The standardized connectors and mounting mechanism enable rapid exchange of the entire drawer assembly, minimizing the time the mining equipment remains non-operational while allowing thorough repair of the contactor in a controlled environment.
Solution Approach 2:
The drawer is designed with pre-positioned bus bar connectors and mounting features that align automatically during installation. This preliminary configuration of connection points and mounting mechanisms enables technicians to complete the replacement operation quickly without time-consuming alignment or connection procedures.
3Loss of time
If the contactor drawer is made modular for easy replacement, then repair time is reduced, but device complexity increases
Solution Approach 1:
The drawer integrates multiple functions into a single modular unit: the vacuum contactor mounting structure, bus bar electrical connectors, front panel with observation window, and arc flash protection shielding are all combined into one replaceable assembly. This merging of components simplifies the replacement operation while providing comprehensive protection and functionality.
Solution Approach 2:
The drawer design incorporates universal mounting features and standardized electrical connectors that can accommodate different vacuum contactor models. The same drawer structure serves multiple purposes: mechanical support, electrical connection, arc flash containment, and providing an observation window for fuse status monitoring, reducing the need for multiple specialized components.
Data Source
AI summary
A removable contactor drawer including a transitional chamber receivable in a fixed casing. The transitional chamber including electrical components for an electrical feeder circuit. The fixed casing being designed to be mounted and used within a power distribution center and has input connectors for the incoming electrical power. Source power may be channeled through the electrical components via the fixed casing and delivered to a power outlet on a front face of the transitional chamber. The transitional chamber may optionally contain equipment to monitor and report operational faults within the contactor drawer. A front-mounted motor drive allows a remotely located operator to perform removal of the transitional chamber while under power, thus providing protection against the danger of arc flash.