Transformer Switch Extension Member for External Actuation

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Solution Overview

Problem

Service technicians face significant risks when servicing transformers with internal oil switches due to accidental contact with active electrical components, as they must manually manipulate these switches within the transformer housing, which can lead to fatal injuries, especially in older equipment with degraded safety features.

Innovation Solution

A switch extension device that allows technicians to manipulate a safety switch from outside the transformer housing, using a switch coupling member and extension member to translate external movements into internal switch positions, ensuring the switch can be toggled without opening the housing and exposing the technician to live components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the oil switch is disposed within the transformer housing for compact design, then the device complexity is reduced, but the safety of the technician deteriorates due to exposure to high-voltage components

Engineering Contradiction:

Improvetransformer housing structureVSAvoidexposure to high-voltage components

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an extension member as an intermediary tool that allows the technician to manipulate the oil switch from outside the transformer housing. The extension member has a first end that engages with the oil switch and a second end that extends outside the housing for external manipulation, thereby mediating between the technician and the internal switch without requiring direct access to high-voltage areas

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The manipulation tool is segmented into two distinct parts: a first end portion that interfaces with the internal oil switch and a second end portion that extends externally for user operation. This segmentation allows the functional separation of switch engagement (inside housing) and user manipulation (outside housing), resolving the contradiction between compact design and safety

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the technician manually manipulates the oil switch inside the transformer cabinet, then the ease of operation is improved, but the reliability of safe operation deteriorates due to risk of accidental contact with electrical components

Engineering Contradiction:

Improveswitch manipulationVSAvoidsafe operation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The extension member serves as a safety intermediary that maintains the ease of manual switch manipulation while eliminating the need for the technician's hand to enter the hazardous area. The extension member transmits the manipulation force from outside the housing to the internal switch, preserving operational ease while ensuring reliable safe operation

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The extension member is prepared and positioned before the technician attempts to manipulate the switch. By having the extension tool ready with its engagement portion oriented toward the switch and extension portion extending outside the housing, the system establishes a pre-configured safe operation pathway that prevents accidental contact before it can occur

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the housing is opened to access the oil switch, then the ease of operation is improved, but the harmful factors increase due to exposure to active electrical components

Engineering Contradiction:

Improveswitch accessVSAvoidexposure to electrical components

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The extension member enables switch access without requiring the housing to be opened. The intermediary tool reaches through the existing opening or access point to engage the switch internally while the technician operates from outside, thereby maintaining ease of operation while eliminating exposure to electrical components that would occur if the housing were opened

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of opening the housing to access the switch (traditional approach), the patent inverts the approach by keeping the housing closed and extending a manipulation tool from outside to inside. This inversion reverses the sequence of actions: rather than opening then accessing, the system accesses through the closed housing structure, thereby eliminating exposure while maintaining access

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS9543094B2Extension member for rotary switch actuation

Publication Date: 2017.01.10 MAINE TECHN SERVICES

AI summary

The disclosure describes a switch extension device and method of installing such a device on a unit of electrical equipment with a closable housing containing a switch and electrically charged components, such as a transformer with a rotary oil safety switch inside the transformer terminal cabinet. The device includes a switch coupling member for mechanically manipulating a switch between at least a first switch position and a second switch position. The switch is disposed inside the closed housing containing components that are electrically charged when the switch is in the first position and not electrically charged when the switch is in the second position. The device also has an extension member with an external portion that extends outside of the closed housing for access by the user without opening the closed housing. Physical manipulation of the external portion of the extension member is mechanically translated to the switch coupling member for mechanically manipulating the switch between at least the first switch position and the second switch position.