Low Voltage Protection Device Clock Testing Arrangement
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Solution Overview
Problem
Current electronic protection devices for low voltage electric lines face challenges in efficiently and cost-effectively testing the operation of internal clock sources, often requiring high computational power or complex and expensive hardware.
Innovation Solution
A clock testing arrangement using a second clock source with a lower nominal frequency to independently perform testing tasks, allowing a data processing module to determine the proper operation of the primary clock source by measuring the time taken to complete these tasks and comparing it to an expected interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If timers included in the controller are used for clock testing, then the testing functionality is integrated, but computational overload occurs or expensive controllers with high computational power are required
Solution Approach 1:
The clock testing functionality is segmented from the main controller by introducing a separate task-performing module. This module operates independently to execute predefined testing tasks, thereby preventing computational overload on the main controller while maintaining integration at the system level.
Solution Approach 2:
A task-performing module is introduced as an intermediary component between the clock source and the controller. This intermediary handles the computationally intensive testing operations, allowing the main controller to focus on its primary functions without computational overload.
2Reliability
If hardware components dedicated to testing functionalities are adopted, then testing reliability is improved, but device complexity and cost increase
Solution Approach 1:
The task-performing module is designed with multi-functionality, capable of executing various predefined testing tasks related to clock source validation. This universal approach improves testing reliability without requiring separate dedicated hardware for each specific test function, thereby controlling device complexity.
3Measurement precision
If complex clock testing arrangements are used, then testing accuracy is improved, but ease of arrangement and industrial cost increase
Solution Approach 1:
The task-performing module autonomously executes predefined testing tasks without requiring complex external arrangement. The module self-manages the testing process by performing tasks within expected time intervals and generating results, thereby maintaining high testing accuracy while simplifying the ease of arrangement and reducing industrial costs.
Data Source
AI summary
An electronic protection device for a LV electric line, the protection device being provided with a control unit comprising a controller including digital data processing resources clocked by a first clock source adapted to provide a first flock signal with a first nominal clock frequency. The control unit comprises a clock testing arrangement adapted to check whether the first clock source is properly operating.