Automated Grounding Device for High Voltage Switchgear

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Solution Overview

Problem

Current grounding devices for high voltage electrical switchgear, such as 200 Amp and 600 Amp grounding elbows, either have insufficient current ratings or cannot be safely detached using a hotstick, posing safety risks and operational limitations when dealing with modern high current circuits.

Innovation Solution

An automated grounding device with a motor-operated pin assembly that can be operated at a safe distance, featuring a clear gel insulation to prevent arcing and a visual indication system, capable of handling momentary currents up to 25,000 Amps, and incorporating a 'T' connector with a conductive outer shield and insulative inner housing for secure connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a 200 Amp grounding elbow is used, then the device can be detached using a hotstick, but the current rating is insufficient for modern high current circuits

Engineering Contradiction:

Improvecurrent ratingVSAvoiddetachability by hotstick

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the manual hotstick detachment mechanism with an automated motor-driven pin assembly system. The motor (38) selectively drives the pin assembly (40) between open and closed positions based on controller signals, eliminating the need for hotstick operation while maintaining safety through automated control and visual indication systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The grounding device integrates multiple functions: it provides high current rating (600 Amp capability with 25,000 Amp momentary rating), automated motor-operated grounding, visual indication of grounding state, and controlled operation capability. This multi-functional design replaces the need for separate hotstick detachment while enhancing safety and operational control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a 600 Amp grounding elbow is used, then the current rating is sufficient, but the device cannot be detached by a hotstick

Engineering Contradiction:

Improvecurrent ratingVSAvoiddetachability by hotstick

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The grounding device is self-operating through the motor assembly that automatically opens and closes the grounding connection without requiring external hotstick intervention. The system serves itself by using automated mechanical actuation combined with visual feedback to indicate its state.

Inventive Principle:

Principle #25Self-service

3Device complexity

If manual grounding operations are performed, then the device structure is simple, but safety risks increase due to the need for hotstick operation

Engineering Contradiction:

ImprovestructureVSAvoidsafety

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces manual hotstick-based mechanical operation with an automated motor-driven system. The motor (38) actuates the pin assembly (40) to make or break grounding connections, eliminating the need for workers to approach high voltage equipment with hotsticks, thereby significantly improving safety while maintaining manageable device complexity through integrated automation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system incorporates visual indication (36) that provides feedback on the grounding state, allowing operators to verify the grounding connection status without physical proximity to hazardous areas. This feedback mechanism enhances safety by enabling remote monitoring and confirmation of the grounding state.

Inventive Principle:

Principle #23Feedback

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 safe and reliable grounding of high voltage switchgear at a distance, preventing arcing and providing visual confirmation of the grounding state, thus addressing the limitations of existing devices in terms of current rating and safety.

Implementation Method 1

uses a clear gel as insulation between contacts to reduce or eliminate the possibility of arcing when the contacts are separated

Methodology Applied

Scientific EffectElectrical insulation: Dielectric

Data Source

PatentEP2819141B1Automated grounding device with visual indication

Publication Date: 2016.10.19 THOMAS & BETTS INTERNATIONAL INC

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AI summary

A grounding device for switchgear includes a connector and a body. The body includes (1) a male interface portion including an electrically conductive bus with a first bore and a spade connector; (2) a conductive housing including a second bore that is axially aligned with the first bore, and a grounding terminal to receive a grounding wire; (3) a pin assembly including a nonconductive tip, and a conductive pin, wherein the pin assembly is configured to move axially within the first and second bores between a closed position that provides an electrical connection between the bus and the conductive housing and an open position that provides no electrical connection; (4) a communications receptacle to receive signals from a controller outside the device body; and (5) a motor configured to selectively drive the pin assembly between the open position and the closed position, based on a signal from the controller.