Switchgear Turn and Twist Mechanism for High Voltage Bus Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switchgear turn and twist mechanisms have limited scope for higher degree of rotation, are bulky, and create dielectric problems, which are inadequate for high voltage applications above 100 kV and current ratings above 2000 A, particularly for bus transfer switching.
Innovation Solution
A switchgear with a turn and twist mechanism comprising a cylindrical pipe that turns about a first axis and twists about a second axis, driven by a mechanism involving a driving base, floating carrier, and driving pin arrangement, allowing for greater rotational flexibility and stability, thereby enabling effective engagement and disengagement of contacts without dielectric issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If lever/clamp arrangements are used for twisting motion, then the mechanism is structurally simple, but the degree of rotation is limited and the structure becomes bulky
Solution Approach 1:
The mechanism is divided into two independent rotation systems: turning motion about the first axis (vertical axis through the insulator) and twisting motion about the second axis (longitudinal axis of the current path pipe). This segmentation allows each axis to achieve its required rotation independently, enabling greater overall degree of rotation without requiring a single complex mechanism
Solution Approach 2:
The invention transitions from a single-axis rotation mechanism to a dual-axis rotation mechanism. By adding rotation about a second axis (longitudinal axis of the pipe) in addition to the first axis (vertical axis), the system achieves greater rotational flexibility and degree of rotation, solving the limitation of conventional single-axis mechanisms
2Reliability
If lever/clamp arrangements are used for twisting motion, then the mechanism is compact, but dielectric problems occur in high voltage applications
Solution Approach 1:
The driving insulator rod acts as an intermediary component that transmits rotational motion from the operating mechanism to the current path pipe while maintaining dielectric isolation. The insulator rod with its high dielectric strength allows the mechanism to operate reliably in high voltage applications (100 kV and above) by preventing electrical breakdown between live parts and ground
Solution Approach 2:
The mechanism uses composite construction combining the driving insulator rod (ceramic or composite insulating material) with the current path pipe (conductive material). This composite structure provides both mechanical functionality and dielectric protection, enabling the mechanism to withstand high voltage stresses while maintaining structural integrity
3Adaptability or versatility
If higher degree of rotation is achieved for bus transfer switching, then switching capability is improved, but the mechanism becomes bulkier
Solution Approach 1:
The mechanism employs dynamic rotation about two axes to achieve the required degree of rotation for bus transfer switching. By allowing the current path pipe to rotate dynamically about both the first axis (turning) and second axis (twisting), the system achieves high adaptability for different switching configurations without requiring excessive mechanical clearance or bulky structure
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a switchgear having a turn and twist mechanism. The switchgear has a contact system for electrical current conduction and bus transfer switching. The contact system has a fixed contact assembly and a movable contact assembly. The turn and twist mechanism drives the movable contact assembly for engagement / disengagement of the movable contacts with the fixed contacts. The turn and twist mechanism comprises a cylindrical pipe and a driving assembly. The driving assembly comprises a driving base, a floating carrier and a driving pin arrangement, for driving the cylindrical pipe for the engagement / disengagement. The driving base drives the floating carrier for turning the cylindrical pipe about a first axis, and drives the driving pin arrangement for twisting the cylindrical pipe about a second axis.