Transformer Test Device Emergency Stop via Wearable Current Sensor
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Solution Overview
Problem
The existing methods for testing current and voltage transformers pose a risk of electric shock to personnel due to the potential for unintentional contact with live parts, as they often require another person to activate the emergency stop, which may not always be feasible, especially in remote or isolated locations.
Innovation Solution
Incorporating an emergency signal input that can be activated externally via a protective device worn by the person, which detects electrical body currents and automatically triggers the emergency stop, ensuring safety without reliance on another person's presence, and also enables quick location-based assistance through position detection and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an emergency stop switch is provided on the converter test device, then safety against electric shock is improved, but the system requires another person to be present and aware of the accident to activate it, which worsens the reliability of protection in isolated locations
Solution Approach 1:
The protective device worn by the person detects electrical body current and automatically triggers the emergency stop without requiring another person to activate it. The system serves itself by having the affected person's own protective device initiate the safety response, eliminating the dependency on another person's presence and awareness.
Solution Approach 2:
The protective device continuously monitors the person's electrical safety status through body current detection and provides immediate feedback by activating the emergency stop switch when a dangerous current is detected. This closed-loop feedback system ensures rapid response to hazardous conditions.
2Reliability
If a protective device detecting body current is introduced, then automatic emergency stop activation is achieved, but the device complexity increases
Solution Approach 1:
The protective device acts as an intermediary between the person and the converter test device's emergency stop mechanism. It detects body current and transmits a signal to trigger the emergency stop, serving as a mediator that bridges the gap between personal safety monitoring and system-wide safety activation without requiring complex integration into the test device itself.
3Loss of information
If position detection is added to the protective device, then location-based assistance is enabled, but energy consumption and device complexity increase
Solution Approach 1:
The protective device integrates multiple functions including body current detection, position tracking, and emergency signal transmission into a single multi-functional unit. By combining these functions, the device avoids the energy and complexity overhead of separate systems while providing comprehensive safety and location capabilities.
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
This solution significantly enhances safety by allowing immediate emergency stop activation and rapid location-based assistance, reducing the risk of electric shock and facilitating quicker response in case of accidents, even when personnel are alone or in remote areas.
Implementation Method 1
The emergency signal is generated with a protective device for detecting an electrical body current, which is worn by the person
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
To increase safety against electric shocks when a person (8) uses a transformer test device (10) with an emergency stop connected to a current and/or voltage transformer (11), the transformer test device (10) is additionally provided with an emergency signal input (21) which, upon receiving an external emergency signal (S) at the emergency signal input (21), activates the disconnecting unit (23), the person (8) wears a protective device (1) for detecting an electric current in the body, and the protective device (1) comprises a garment (2) and an evaluation unit (6), wherein the person (8) wears the garment (2) and the garment (2) is equipped with at least one sensor (3) for detecting the electric current in the body.and the evaluation unit (6) evaluates a signal detected by the at least one sensor (3) and, in the event of a detected impermissible body current, outputs an emergency signal (S) and transmits it to the emergency signal input (21) of the transformer test device (10), and the protective device (1) comprises a unit (72) for determining the position or location of the person (8).