Non-contact Sensor for Motor Control Center Voltage Monitoring

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Solution Overview

Problem

Motor control centers (MCCs) pose a safety hazard due to high voltages, requiring manual verification to ensure de-energization before maintenance, which is cumbersome and risky, especially when using voltmeters that necessitate interior access.

Innovation Solution

A system with non-contact sensors, including voltage and temperature sensors, that monitor internal conditions without direct contact, providing external indicators and controlling access to prevent hazardous situations, ensuring safety and reliability by maintaining the MCC closed while allowing remote monitoring and control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual verification with voltmeter is used to ensure de-energization, then safety verification is achieved, but operator exposure to hazardous voltages and operational complexity increase

Engineering Contradiction:

Improvesafety verificationVSAvoidoperator exposure to hazardous voltages

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A non-contact voltage sensor acts as an intermediary device installed inside the MCC enclosure to detect hazardous voltages. The sensor transmits voltage presence information to an external indicator, allowing operators to verify de-energization status without direct interior access or exposure to hazardous voltages.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/manual voltmeter testing process with an automated non-contact sensing system. The non-contact sensor and external indicator system automatically monitor and display voltage status, eliminating the need for operators to manually access the enclosure and perform hazardous voltage testing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If manual verification with voltmeter is used to ensure de-energization, then safety verification is achieved, but operational complexity and time consumption increase

Engineering Contradiction:

Improvesafety verificationVSAvoidoperational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The MCC enclosure performs self-verification of its energized state through the installed non-contact voltage sensor. The system automatically detects and communicates its own voltage status to the external indicator, eliminating the need for external operators to perform complex verification procedures.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the manual voltmeter testing process with an automated non-contact sensing system. The non-contact sensor and external indicator system automatically monitor and display voltage status, eliminating the need for operators to manually access the enclosure and perform hazardous voltage testing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-affected harmful factors

If MCC enclosure is kept closed for safety, then operator protection is improved, but access for maintenance and monitoring becomes difficult

Engineering Contradiction:

Improveoperator protection from hazardous voltagesVSAvoidaccess for maintenance and monitoring

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates an external copy or representation of the internal voltage status through the indicator system. The indicator displays the same information that would be obtained by direct measurement inside the enclosure, allowing operators to monitor conditions remotely without opening the enclosure.

Inventive Principle:

Principle #26Copying

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

Enhances safety and reliability by allowing safe access to MCCs without exposing operators to hazardous voltages, improving maintenance efficiency through remote monitoring and automatic access control.

Implementation Method 1

the non-contact sensor includes a non-contact voltage sensor

Methodology Applied

Scientific EffectNon-contact voltage sensing: Electric Field

Implementation Method 2

the non-contact sensor includes a non-contact temperature sensor

Methodology Applied

Scientific EffectNon-contact temperature sensing: Thermal Radiation

Data Source

PatentUS7528612B2System and method for monitoring a motor control center

Publication Date: 2009.05.05 ROCKWELL AUTOMATION TECH INC

AI summary

A system, in one embodiment, includes a power distribution center having an enclosure with an access door configured to move between a closed position and an open position. The power distribution center includes a non-contact sensor disposed inside the enclosure, wherein the non-contact sensor includes a non-contact voltage sensor, or a non-contact temperature sensor, or a combination thereof. The power distribution center also includes an indicator viewable outside of the enclosure while the door is in the closed position, wherein the indicator is coupled to the non-contact sensor.