Movable Contactor Block for Phase-Aware Power Distribution
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Solution Overview
Problem
Existing electrical devices for supplying power to multiple units, such as motor starters, face practical challenges during maintenance due to wear in switching devices, requiring complete disconnection of three-phase motors and potential phase reversal issues when replacing defective parts.
Innovation Solution
An electrical device with a fixed support and movable contactor blocks, each equipped with a switching device and an electronic monitoring system, allowing for independent control and safe replacement of defective blocks while maintaining connection to supply lines and preventing phase reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching device is faulty, then the entire removable connector has to be replaced, but this involves complete disconnection of the supply line which is not practical
Solution Approach 1:
The removable connector is divided into a fixed support and a movable contactor block. The contactor block can be independently removed from the fixed support, allowing replacement of the switching device without disconnecting the supply line from the electrical device. This segmentation enables maintenance of the switching device while keeping the connector partially assembled.
2Ease of repair
If the removable connector is replaced during maintenance, then the switching device can be renewed, but the complete disconnection requires close observation of power supply phases
Solution Approach 1:
The contactor block is pre-assembled with the switching device as an integrated unit. During maintenance, the entire pre-assembled contactor block can be removed and replaced as a single component, eliminating the need to manually handle and reconnect individual phase wires. This preliminary assembly simplifies the replacement process and reduces the risk of phase connection errors.
3Reliability
If the control block is disjoined before replacing contactor blocks, then safe replacement is ensured, but the operational control is lost during maintenance
Solution Approach 1:
The control block is extracted as a separate, removable component from the fixed support. During maintenance, only the contactor block needs to be removed, while the control block remains attached to the fixed support. This allows the switching device to be replaced without disconnecting the control block, maintaining operational control and reducing maintenance downtime.
Data Source
AI summary
An electrical device includes a fixed support with supply lines and a distribution circuit to supply power to a contactor block. Each contactor block includes secondary lines, each connected to a supply line, and is movable between joined and disjoined positions. Each contactor block includes a switching device for switching all secondary lines of the contactor block between open and closed. The electrical device also includes a control block, movable between joined and disjoined positions. When in the joined position, each contactor block also is held in the joined position, an electronic monitoring device of the control block also being connected to the switching device of each contactor block to control switching of each switching device independently. When the control block is in the disjoined position, the switching device of each contactor block opens the secondary lines, while each contactor block is movable between its joined and disjoined positions.