Tap Plug Assembly for High-Torque Hotstick Installation

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Solution Overview

Problem

Existing tap plugs are inadequate in terms of manufacturing cost, ease of retrofitting, suitability for high torque applications, ability to be installed using a hotstick, and ease of disassembly, particularly in 900 amp applications.

Innovation Solution

A tap plug design featuring a housing with a rotatable first member and second member, each with threads for engaging a conductor lug and a stud, and a guide member connected by a releasable connection that ensures proper alignment and torque application, allowing for easy installation and disassembly, and capable of withstanding high torque.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a traditional tap plug design is used, then the manufacturing cost is reduced, but the ability to withstand high torque and suitability for 900 amp applications deteriorates

Engineering Contradiction:
Improvemanufacturing costVSAvoidtorque withstanding capability
Core Design Contradiction:
Ease of manufactureVSStrength

Solution Approach 1:

The tap plug is divided into multiple members (first member, second member, third member) that can rotate independently relative to each other. This segmentation allows each member to be optimized for specific functions while collectively withstanding high torque loads through distributed stress across multiple components.

Inventive Principle:
Principle #1Segmentation

2Device complexity

If a traditional tap plug design is used, then the device complexity is reduced, but the ease of installation using a hotstick and ease of disassembly deteriorates

Engineering Contradiction:
Improvestructural complexityVSAvoidease of installation and disassembly
Core Design Contradiction:
Device complexityVSEase of operation

Solution Approach 1:

The tap plug employs dynamic members that can rotate relative to each other, enabling the device to adapt its configuration during installation and disassembly operations. This dynamic capability allows for easier manipulation with hotsticks and simpler disassembly while maintaining structural integrity during use.

Inventive Principle:
Principle #15Dynamics

3Ease of manufacture

If a traditional tap plug design is used, then the manufacturing cost is reduced, but the ability to reduce load for testing deteriorates

Engineering Contradiction:
Improvemanufacturing costVSAvoidload reduction capability for testing
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The tap plug is designed with multiple members and rotation capabilities that enable it to perform multiple functions: it can withstand high torque for 900 amp applications, reduce load for testing operations, and facilitate easy installation and disassembly. This multi-functionality is achieved while maintaining cost-effectiveness through the modular member structure.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250219323A1Tap plugs
Publication Date: 2025.07.03 HUBBELL INC
  • US20250219323A1 patent drawing
  • US20250219323A1 patent drawing
  • US20250219323A1 patent drawing

AI summary

A tap plug for engaging a conductor lug and a stud is provided. The tap plug includes a housing, a first member, and a second member. The housing has an inner bore defining a longitudinal axis. The first member is in the inner bore and is rotatable with respect to the housing about the longitudinal axis. The first member has an external thread at a first end, where the external thread engages the conductor lug. The second member is rotatable with respect to the housing about the longitudinal axis and has an internal thread at the first end. The first end is open so that the internal thread can engage the stud.