Plug-Mounted Surge Arrester for Faster Underground Fault Isolation

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Solution Overview

Problem

Existing surge arresters for underground residential loop circuits are inefficient and require manual reconfiguration after cable failures, leading to prolonged power restoration times.

Innovation Solution

A plug-mounted surge arrester integrated with a bushing well interrupter assembly that includes a surge arrester with a grounding jacket and conductor, allowing for automatic protection and disconnection from the interface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual reconfiguration processes are used to identify and address cable failures, then workers can physically test and reconfigure transformers, but power restoration times become long and efficiency is reduced

Engineering Contradiction:

Improvecable failure protectionVSAvoidpower restoration time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The surge arrester system performs automatic detection and isolation of cable faults without requiring manual worker intervention. The bushing well interrupter assembly automatically detects cable failures and isolates the faulted section, enabling the system to serve itself in identifying and addressing cable problems, thereby eliminating long restoration times associated with manual reconfiguration processes

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical processes (workers physically going to transformers to test and reconfigure) with an automated electrical system. The bushing well interrupter assembly uses electrical detection and automatic switching mechanisms to identify cable failures and reconfigure the circuit, substituting human mechanical operations with automated electrical control systems that restore power rapidly

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If existing surge arresters with elbow mounted devices or bare cable connections are used, then surge protection is provided, but integration with bushing well interrupter devices requires handling cable elbows and increases device complexity

Engineering Contradiction:

Improvesurge protectionVSAvoidsurge arrester integration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The surge arrester is merged with the bushing well interrupter assembly into a single integrated unit. The surge arrester connects directly to the electrical hardware of the interrupter assembly through a releasable connector, eliminating the need for separate elbow mounted devices or bare cable connections. This combination simplifies the overall device structure while maintaining surge protection functionality and enabling automatic operation with the interrupter assembly

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If automatic protection and isolation is implemented using bushing well interrupter devices, then power restoration efficiency is improved, but integration with existing transformer interfaces requires new surge arrester configurations

Engineering Contradiction:

Improvepower restoration efficiencyVSAvoidsurge arrester integration

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The surge arrester is designed with universal compatibility for integration with bushing well interrupter assemblies in existing transformer interfaces. The releasable connector design allows the surge arrester to be easily attached to various electrical hardware configurations, providing multi-functional capability that works with different transformer interface types while maintaining ease of installation and manufacturing

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables efficient and automatic isolation of faults, reducing power restoration times by allowing for quick reconfiguration of underground circuits without manual intervention.

Implementation Method 1

a surge arrester with an insulation member, a grounding jacket formed over a portion of the insulation member and a conductor extending through the insulation member and being electrically coupled to the hardware and the grounding jacket

Methodology Applied

Scientific EffectNon-linear electrical resistance: Electrical Resistance

Data Source

PatentUS12609221B2Plug mounted surge arrester

Publication Date: 2026.04.21 S&C ELECTRIC CO

AI summary

A switch assembly including a switch and an interface physically coupled to the switch and configured to be physically coupled to an electrical component, such as a transformer. The switch assembly also includes an interface having electrical hardware electrically coupled to the switch and configured to be electrically coupled to the component. The switch assembly further includes a surge arrester having an insulation member, a grounding jacket formed over a portion of the insulation member and a conductor extending through the insulation member and being electrically coupled to the hardware and the grounding jacket. The interface further includes a releasable connector that is electrically coupled to the conductor and allows the surge arrester to be disconnected from the interface.