Ring Main Unit Interlock Device Cam Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In ring main units, the existing interlock devices allow the fuse cover to be closed while the operating mechanism is in a grounded state, leading to a risk of accidental dielectric breakdown when both fuse and cable covers are open, potentially causing safety accidents.
Innovation Solution
An interlock device is designed with a cam and spring mechanism that ensures the fuse cover can only be closed when the cable cover is in a closed state, using an interlock frame, cam, operating plate, and spring to prevent the fuse cover from being closed unless the cable cover is properly secured, thereby preventing the main circuit from being active when the cable cover is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fuse cover is allowed to be closed when the operating mechanism is in a ground state, then the fuse cover can be opened and closed for maintenance, but the circuit may remain in an always-on state creating safety risks
Solution Approach 1:
The patent introduces an interlock mechanism as an intermediary between the fuse cover and cable cover. This interlock mechanism includes a locking member that physically connects both covers and prevents the fuse cover from being closed unless the cable cover is already closed. The locking member acts as a mediator that enforces the proper sequence of operations, allowing maintenance access when needed while preventing unsafe states where the circuit could be accidentally activated.
2Ease of manufacture
If both fuse cover and cable cover are open for maintenance, then access is provided for servicing, but accidental dielectric breakdown may occur when fuse cover is closed
Solution Approach 1:
The patent implements a preliminary action principle by requiring the cable cover to be closed before the fuse cover can be closed. The interlock mechanism detects whether the cable cover is in the closed position and only then permits the fuse cover to be closed. This preliminary check ensures that the cable insulation is restored before re-energizing the fuse section, preventing dielectric breakdown accidents while still allowing necessary maintenance access when both covers are open.
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 effectively prevents safety accidents by ensuring the fuse cover can only be closed when the cable cover is closed, maintaining the circuit in a safe state and preventing accidental activation.
Implementation Method 1
a spring an end of which is fixed to part of the cam to store an elastic force due to the movement of the cam
Data Source
AI summary
The present invention relates to an interlock device of a ring main unit, and more particularly, to an interlock device of a ring main unit in which a fuse cover can be closed in interlock with a cable cover.An interlock device of a ring main unit according to an embodiment of the present disclosure may include an interlock frame provided in part of the ring main unit, a cam on part of which an engaging portion is protruded and formed and on the other part of which a slit is formed, rotatably provided within the interlock frame, an operating plate an end of which is coupled to the slit to perform a vertical movement, and a spring an end of which is fixed to part of the cam to store an elastic force due to the movement of the cam.