Terminal Shield Indication Circuit for Circuit Interrupter Safety
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Solution Overview
Problem
Circuit interruption devices can malfunction, leaving poles in a closed state, making it difficult for technicians to determine which side is electrified, especially in grid-tied photovoltaic applications, posing safety risks during maintenance.
Innovation Solution
A terminal shield with an integrated indication circuit that provides visual and audible indications when terminals are electrified, allowing technicians to easily identify electrified portions of the circuit interrupter, usable on both line and load sides, or both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a circuit interrupter is used to protect electrical circuits, then circuit protection from overcurrent and under-voltage conditions is achieved, but the ability to clearly identify electrified terminals for technician safety is insufficient
Solution Approach 1:
A terminal shield is introduced as an intermediary component between the circuit interrupter terminals and the technician. The shield includes indication circuits (visual LEDs and audible buzzers) that mediate the transmission of electrification status information from the terminals to the technician, solving the information loss problem while maintaining circuit protection reliability.
Solution Approach 2:
The terminal shield provides real-time feedback to technicians about the electrification status of terminals. The indication circuits continuously monitor and display whether terminals are electrified or de-energized, giving technicians immediate feedback on safety conditions before and during maintenance work.
2Loss of information
If visual indication is provided on the terminal shield, then technician awareness of electrified terminals is improved, but device complexity increases
Solution Approach 1:
The indication circuits (visual LEDs and audible buzzers) are merged into the terminal shield housing, creating an integrated safety device. This combining of multiple functions (protection shielding and status indication) into a single component adds safety functionality without requiring separate independent devices, thus managing complexity through integration.
Solution Approach 2:
The terminal shield serves multiple functions: it acts as a protective barrier over terminals and simultaneously provides electrification status indication through integrated visual and audible circuits. This multi-functionality reduces the need for separate devices and manages overall system complexity while improving information availability.
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 by clearly indicating electrified terminals, reducing the risk of accidents during maintenance and ensuring proper de-energization of circuits, even in complex configurations.
Implementation Method 1
The indication circuit can include a number of LEDs situated on the terminal shield
Implementation Method 2
The indication circuit can include a number of buzzers situated on the terminal shield
Data Source
AI summary
A safety apparatus is a terminal shield having an indication circuit incorporated therein. The safety apparatus is usable with a circuit interrupter to overlie one or more terminals of the circuit interrupter that are connected with line and load conductors and to thereby form a circuit interrupter apparatus. The safety apparatus can be employed at the line side of a circuit interrupter, at the load side of a circuit interrupter, or at both sides of a circuit interrupter. The safety apparatus can be provided as part of a new circuit interrupter apparatus or can be provided to retrofit existing circuit interrupters. The indication circuit advantageously outputs from a top surface of the terminal shield one of a visual indication and an audible indication when one or more terminals of the circuit interrupter are electrified, thereby easily conveying to a technician the portions of the circuit interrupter that are electrified.