Integrated Low-Voltage Switchboard Protection and Isolation
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Solution Overview
Problem
Existing low-voltage boards require separate elements for protection against overloads and short-circuits and isolation from power supply, leading to increased board dimensions and installation challenges, as well as the need for additional safety measures due to live parts access.
Innovation Solution
A single switching and protection means with a vacuum circuit breaker that combines protection against electrical faults and isolation functions, allowing compact design and remote operation, featuring two or three positions, and includes indicators and interlocks for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fuse blocks and break switches are used for protection and isolation functions, then the reliability of protection and isolation is improved, but the device complexity and board dimensions increase
Solution Approach 1:
The patent combines separate fuse blocks and break switches into a single integrated switching and protection means. This single device performs both protection functions (overload and short-circuit protection) and isolation functions, eliminating the need for multiple separate elements and reducing device complexity while maintaining reliability
Solution Approach 2:
The switching and protection means is designed as a multi-functional device that simultaneously provides protection against overloads, protection against short-circuits, and isolation from power supply. This universal device replaces multiple specialized components, reducing the overall complexity of the low-voltage board
2Reliability
If separate fuse blocks and break switches are installed, then protection and isolation functions are achieved, but the area of the low-voltage board increases
Solution Approach 1:
By merging separate fuse blocks and break switches into one integrated switching and protection means, the patent significantly reduces the space required on the low-voltage board. The single device occupies less area than multiple separate components would require, enabling more compact board designs
3Reliability
If fuse blocks are used for protection, then protection against overloads and short-circuits is provided, but the time to restore service increases due to manual fuse replacement
Solution Approach 1:
The switching and protection means incorporates automatic reclosing capability that allows the device to automatically restore service after transient faults without requiring manual intervention. This self-service feature eliminates the need for skilled operators to physically replace protection elements, dramatically reducing service restoration time while maintaining protection functions
4Object-affected harmful factors
If the low-voltage board is left out of service for maintenance or expansion, then safety during operations is improved, but the productivity and service continuity deteriorate
Solution Approach 1:
The switching and protection means can be operated to disconnect the low-voltage board from power supply before maintenance or expansion work begins, ensuring safety during operations. The device provides a safe working condition by establishing isolation in advance, allowing maintenance personnel to work on live parts without risk of electric shock
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The switching and protection means (1) of the present invention for being applied in low-voltage boards comprises a casing (9) wherein it can house at least one circuit breaker (5) with at least two positions, actuation means (6), a protection element (22), and selector means (7) which, in the case of a circuit breaker (5) with three positions, allows transmitting at least three switching positions (making, breaking and/or disconnecting, and grounding) depending on the movement of the actuation means (6) with two functional positions (C, D) and depending on the position of the selector means (7) with at least two positions (A, B). The switching and protection means (1) integrated inside the casing (9) are installed in a structure (15), which in turn can be installed on the distribution busbar (12) of a low-voltage board.