Tetrapolar Contactor Neutral Conductor Integration
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Solution Overview
Problem
Existing contactors face issues with neutral line breaks due to aging contact pads, leading to overvoltages and potential destruction of loads, requiring external wiring to ensure proper electrical connection.
Innovation Solution
The electrical apparatus features a tetrapolar contactor design with a neutral conductor integrated into a support system, allowing movable contact bridges to move between open and closed positions without obstructing the neutral conductor, which is held in place by slideways within the device, eliminating the need for external wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all movable contacts are mounted in a single support to move simultaneously, then the device can be operated manually or by a coil, but the neutral conductor may be obstructed by the movable contact bridges during movement
Solution Approach 1:
The support is divided into two functional zones: a first portion that houses and moves the movable contact bridges, and a second portion that provides a recess for the neutral conductor to pass through. This segmentation allows the movable contacts to move simultaneously while the neutral conductor remains unobstructed, as it travels through a dedicated pathway in the support structure.
2Reliability
If external wired connection is installed to ensure proper electrical connection on neutral line, then neutral breakage is prevented, but the installer faces additional constraints
Solution Approach 1:
The neutral conductor connection is merged with the existing support structure by integrating a recess directly into the support that guides and protects the neutral conductor. This eliminates the need for separate external wiring, as the support itself provides the necessary pathway and electrical connection, simplifying installation while maintaining reliability.
3Device complexity
If the neutral conductor passes through the support, then integration is achieved, but the conductor may prevent the movement of the support
Solution Approach 1:
A recess is introduced as an intermediary structural element within the support. This recess creates a dedicated pathway through the support for the neutral conductor, allowing the conductor to pass through without interfering with the movement of the movable contact bridges. The recess acts as a mediator that reconciles the need for conductor integration with the requirement for free movement of the movable contacts.
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
This solution prevents neutral line breaks without additional installer constraints, ensuring reliable electrical connections and minimizing modifications to existing contactors.
Implementation Method 1
capable of carrying an electric current and interacting with a fixed armature attached to the fixed contacts of the contactor and a moving armature attached to the moving contacts of the contactor
Implementation Method 2
When sufficient current flows through the coil, the fixed armature attracts the moving armature and becomes fixed to it: the magnetic circuit is then closed
Data Source
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AI summary
The present invention relates to an electrical apparatus for making or breaking current in an electrical circuit, said apparatus comprising at least two pairs of fixed contacts (19 to 24), each pair comprising two fixed contacts electrically connected respectively to an upstream terminal (11 to 14) and to a downstream terminal (15 to 18) of the apparatus, and associated with this pair of fixed contacts, a bridge of two movable contacts (25 to 27) capable of being moved between a first position in which it electrically connects these two fixed contacts, and a second position in which the flow of current between these two fixed contacts is interrupted, one of the pairs of fixed contacts and its associated bridge of movable contacts being on a line carrying a phase (8,9,10), the other or another of the pairs of fixed contacts and its associated bridge of movable contacts being on a line (7) carrying the neutral.This device is characterized in that the electrical connection between the two terminals (11,15) located on the neutral line (7) is a permanent connection.