Dead Front Connector Voltage Indicator

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Solution Overview

Problem

Existing insulated electrical connectors in underground power distribution systems lack effective voltage testing mechanisms to ensure safe connections and user safety, particularly in environments prone to electromagnetic interference and radio frequency interference.

Innovation Solution

A dead front connector with a built-in voltage testing circuit and indicator that detects voltage presence between a power cable and a device, using capacitive voltage taps and a series-type or parallel-type circuit configuration to illuminate an indicator when voltage exceeds a predetermined threshold, providing a visual indication of voltage presence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a voltage testing mechanism is added to the connector, then user safety and reliability are improved, but device complexity increases

Engineering Contradiction:

Improveconnection safetyVSAvoidconnector structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The voltage testing circuit is integrated within the connector housing, merging the testing function with the existing connector structure. The capacitive voltage taps are formed using existing conductive elements within the connector, eliminating the need for separate external testing equipment and reducing overall system complexity while maintaining enhanced safety functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The connector is designed to perform multiple functions: electrical connection, voltage testing, and visual indication. The same housing and internal structures serve both as mechanical connectors and as components of the voltage detection system, allowing a single device to fulfill multiple safety and operational roles without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If an indicator is added to show voltage presence, then user safety is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvesafety indicationVSAvoidconnector production

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The indicator provides visual feedback through color or light changes to indicate voltage presence. This allows users to quickly assess safety conditions without complex instrumentation, improving safety while maintaining relatively simple manufacturing processes for the indicator component itself.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The indicator acts as an intermediary between the voltage testing circuit and the user. It translates electrical voltage detection into a simple visual signal that can be easily manufactured and understood, bridging the gap between complex electrical testing and user-friendly safety indication.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If capacitive voltage taps are used for testing, then electromagnetic interference resistance is improved, but measurement precision may be affected

Engineering Contradiction:

Improveelectromagnetic interference resistanceVSAvoidvoltage detection accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The system replaces direct electrical contact testing with capacitive coupling for voltage detection. This substitution allows voltage testing without direct galvanic connection, providing immunity to electromagnetic interference while maintaining sufficient measurement precision for safety-critical voltage presence detection through the capacitive coupling mechanism between internal taps and external conductors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Ensures user safety by providing a visual indication of voltage presence, preventing accidental contact and enhancing the reliability of electrical connections by mitigating electromagnetic interference and radio frequency interference.

Implementation Method 1

using capacitive voltage taps and a series-type or parallel-type circuit configuration to illuminate an indicator when voltage exceeds a predetermined threshold

Methodology Applied

Scientific EffectCapacitive voltage detection: Capacitance

Implementation Method 2

illuminate an indicator when voltage exceeds a predetermined threshold, providing a visual indication of voltage presence

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11499996B2Dead front connector having a voltage indicator

Publication Date: 2022.11.15 HUBBELL INC

AI summary

A dead front connector including a housing, an electrical coupling configured to electrically connect a power cable to a device, and an indicator located on the housing. The dead front connector further including a voltage testing circuit configured to test a voltage between the power cable and the device and illuminate the indicator when the voltage is above a predetermined threshold.