Visible Open Linking Assembly for Switchgear Contact Inspection
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Solution Overview
Problem
High and medium voltage switchgear with vacuum type circuit interrupters lack a means for visual inspection of switch contacts, leading to potential false readings and safety risks due to the sealed and opaque nature of the vacuum bottles.
Innovation Solution
A power cable elbow connector with a visible open linking assembly and transparent ports allows for visual confirmation of the switch contact status through a conductive and semi-conductive design, enabling safe identification of the energized or de-energized state without disassembling the switchgear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum bottles are made of metal and ceramic non-transparent materials, then the switchgear provides reliable insulation and vacuum sealing, but the switch contacts become invisible and cannot be visually inspected
Solution Approach 1:
The vacuum bottle is segmented into transparent and opaque sections, with a transparent observation window positioned to allow viewing of the contact area while the rest of the bottle maintains its opaque metal and ceramic construction for vacuum sealing and insulation
Solution Approach 2:
A transparent observation window serves as an intermediary element that allows optical access to the contact area without compromising the vacuum seal or insulation properties of the opaque bottle material
2Reliability
If switch contacts are sealed inside the vacuum bottle, then the switchgear maintains vacuum integrity, but the contact status cannot be confirmed and false readings may occur
Solution Approach 1:
The transparent observation window is pre-positioned on the vacuum bottle to provide continuous visual access to the contact area, allowing operators to verify contact status before attempting any operations and preventing false readings
Solution Approach 2:
The transparent window acts as an intermediary that transmits visual information about the contact status from the sealed vacuum interior to the external observer without breaking the vacuum seal
3Ease of operation
If the linkage between the handle and switch contacts is defective, then the switch may not properly open or close, but there is no positive indication to alert operating personnel
Solution Approach 1:
The transparent observation window provides immediate visual feedback on the actual contact position, allowing operators to verify whether the handle movement has resulted in the expected contact open/close status and detecting linkage defects through discrepancy between handle position and contact position
Data Source
AI summary
An electrical connector assembly may include a connector body having a conductor receiving end, a connector end, a linking assembly connecting the conductor receiving end to the connector end, and a visible open port positioned in the connector body for viewing at least a portion of the linking assembly. The linking assembly may include a rearward conductive end conductively coupled to the conductor receiving end, a flexible conductor conductively coupled to the connector end, and a linking pin coupled to the flexible conductor and movable between a first position and a second position. The first position maintains the conductor receiving end electrically isolated from the connector end, and the second position conductively couples the conductor receiving end to the connector end.