Rotating Switchboard Interlock for Single-Source Isolation
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Solution Overview
Problem
Existing locking devices for electrical panels in electricity distribution systems are often bulky, complex, and difficult to use, posing a risk of improper handling and accidents, while also failing to prevent simultaneous connection of multiple electricity sources, which can cause irreversible damage.
Innovation Solution
A modular locking device with a rotating locking member that can be easily integrated between two switching devices, featuring a blocking edge and contact edges to ensure only one source is connected at a time, along with sensors and a simple, intuitive design for user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is designed to ensure only one electricity source is connected at a time, then safety is improved, but the device becomes bulky and complex to manufacture, install, and use
Solution Approach 1:
The locking device is segmented into a housing and a separate locking member that can rotate independently. The locking member is further divided into functional zones (locking edge, first contact edge, second contact edge) that interact with different switching devices. This segmentation allows the locking mechanism to be compact while maintaining safety functions, resolving the contradiction between safety and device complexity.
Solution Approach 2:
The locking member serves multiple functions simultaneously: it blocks the first switching device when in the first locking position, blocks the second switching device when in the second locking position, and provides visual indication through its orientation. This multi-functionality reduces the need for additional components, making the device compact and simple while ensuring safety.
2Reliability
If existing locking devices are designed with interlocking systems, then safety is improved, but handling by end users becomes difficult and risk of accidents increases
Solution Approach 1:
The locking member is designed to be rotatable about an axis perpendicular to the front face of the housing, allowing dynamic repositioning between different locking positions. This rotational movement provides clear tactile and visual feedback to users, making it intuitive to understand the current state and perform correct operations, thereby improving ease of operation while maintaining safety.
Solution Approach 2:
The locking member's orientation serves as a visual indicator of the system state. When the locking member is positioned in different orientations, it clearly indicates which switching device is blocked and which is available, providing immediate visual feedback to users. This visual indication simplifies user interaction and reduces the risk of accidents.
Data Source
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AI summary
A locking device comprises: - a housing (10) intended to be mounted on an electrical panel between a first switching device (4) and a second switching device (6), each of the switching devices having a control lever (24, 28) movable between a low position corresponding to an open state and a high position corresponding to a closed state; - a locking member (12) movable in rotation between: • a first locking position, in which the locking member blocks the control lever of the first switching device in the open position, and • a second locking position, in which the locking member blocks the control lever of the second switching device in the open position.