Transformer Room Door Interlock via Ground Switch Cam
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In transformer rooms of vacuum circuit breakers, the existing door interlock systems do not ensure user safety by allowing the door to be opened regardless of the ground switch position, potentially exposing users to residual voltage during maintenance, which is hazardous.
Innovation Solution
A door interlock device is designed for the power transformer room, featuring a cam on the ground switch's driving shaft, a slidable shaft with a spring, and an interlock plate that restricts the door from opening unless the ground switch is in a closed position, ensuring the door can only be opened when the ground switch is grounded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door interlock system allows the door to be opened regardless of ground switch position, then ease of operation is improved, but user safety deteriorates due to exposure to residual voltage
Solution Approach 1:
The patent introduces an interlock mechanism as an intermediary between the ground switch and the door opening operation. The interlock plate acts as a mediator that physically connects the ground switch position to the door latch, ensuring that the door can only be opened when the ground switch is in the closed position, thus preventing exposure to residual voltage while maintaining operational convenience
2Object-affected harmful factors
If a door interlock mechanism is added to prevent door opening unless ground switch is closed, then user safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the door interlock function with the existing ground switch mechanism. The interlock plate is integrated into the ground switch assembly, and the same mechanical movement that operates the ground switch also controls the door latch through the interlock plate, thereby achieving the safety function without adding a completely separate complex interlock system
Solution Approach 2:
The ground switch mechanism is given multiple functions: it not only controls the grounding state but also simultaneously controls the door opening permission through the interlock plate. This multi-functionality eliminates the need for a dedicated interlock mechanism, reducing overall device complexity while maintaining safety
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
The device ensures user safety by preventing the door from being opened unless the ground switch is closed, thereby preventing exposure to residual voltage during maintenance, enhancing safety protocols in transformer rooms.
Implementation Method 1
a spring disposed within the supporter to provide an upward elastic force to the shaft
Implementation Method 2
a cam disposed on a driving shaft of the ground switch
Data Source
AI summary
A door interlock device for a power transformer room in a vacuum circuit breaker includes a cam disposed on a shaft of a ground switch, a supporter disposed on a side plate of a power transformer room, a shaft disposed at the supporter to be slidable and having one end contacting the cam to be upward and downward movable, a spring disposed within the supporter to provide an upward elastic force to the shaft, and an interlock plate disposed at one side of the power transformer room door and configured to be in contact with the shaft.