Double-Break Disconnector Segmented Contacts for High Current
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Solution Overview
Problem
Current double-break double-movement disconnectors are limited to conducting electrical currents of up to 4000 A, and attempts to increase current intensity by adding C-shaped fixed contacts result in reactance issues that reduce the effectiveness of multiple parallel paths for current conduction.
Innovation Solution
The disconnector features C-shaped contact sockets with fixed contacts connected to supporting arms, divided by an intermediate portion that allows equal current conduction through two conducting arms, reducing reactance and enabling higher current intensities by distributing current uniformly across multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If C-shaped fixed contacts are added to create multiple parallel paths for current conduction, then the number of current paths increases, but reactance effect causes current to flow only along the first fixed contacts, eliminating the advantage of multiple paths
Solution Approach 1:
The C-shaped fixed contact is segmented into two separate contact portions (first and second contact portions) that are electrically isolated from each other. Each portion independently receives current from moving contacts, eliminating the reactance effect between series-connected contacts and enabling effective parallel current paths.
Solution Approach 2:
The patent transitions from a single-planar C-shaped contact structure to a three-dimensional configuration where two contact portions are spatially separated and oriented differently. This dimensional change allows current to flow through multiple independent paths simultaneously, overcoming the limitation of sequential current flow in traditional C-shaped contacts.
2Device complexity
If traditional C-shaped fixed contacts are used, then the structure is simple, but the current conduction is limited to maximum 4000 A
Solution Approach 1:
The fixed contact structure is divided into multiple independent contact portions that can simultaneously conduct current. This segmentation multiplies the current-carrying capacity while maintaining a relatively simple overall structure, enabling conduction of currents exceeding 4000 A.
Solution Approach 2:
Multiple contact portions are combined within a single fixed contact assembly, creating a composite structure that achieves high current capacity. The merging of multiple current paths in one assembly provides both simplicity and high performance.
3Quantity of substance
If multiple C-shaped fixed contacts are arranged in parallel, then more current paths are available, but reactance induces current to flow only along the first fixed contacts
Solution Approach 1:
By segmenting the fixed contact into electrically isolated portions, the patent eliminates the series connection that causes reactance accumulation. Each segmented portion acts as an independent current path without reactance interference from other portions, allowing all paths to carry current effectively.
Solution Approach 2:
The patent introduces an intermediary structure (the segmented contact portions with their own supporting arms) that mediates between the moving contacts and the main current path. This intermediary configuration allows current to distribute across multiple paths without the reactance problems of direct parallel C-shaped 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 design allows for the effective and stable conduction of electrical currents exceeding 6000 A, with reduced reactance and increased durability, while maintaining efficient current conduction and requiring less material, thus overcoming the limitations of existing disconnectors.
Implementation Method 1
the other end that is kept divaricated from the first end by means of a spring
Implementation Method 2
These contacts are provided by means of conducting elements that are folded into an arc-like shape
Data Source
AI summary
A disconnector, including a crossmember, which has contact pins at its opposite ends, C-shaped contact sockets, which are aligned so as to correspond to the pins in order to receive them by insertion, along a trajectory that is circumferential with respect to a first rotation axis of the crossmember, which is substantially transverse thereto, a support of the crossmember that defines for it the first rotation axis, and a second rotation axis, which is substantially longitudinal to the crossmember, elements for the rotation of the crossmember about the first rotation axis and about the second rotation axis, where fixed contacts are connected electrically, in two separate regions, to supporting arms that belong to the sockets, and have a portion that is intermediate with respect to the two regions, is adapted for contact with the moving contacts, and divides the fixed contacts into two opposite conducting arms.