HIL Protection Application – System Overview
Real-time FPGA-based protection validation for modern power and control systems.
Introducing the HIL Protect Application
The HIL Protect Application is a specialized Hardware-in-the-Loop (HIL) protection testing platform designed to support real-time evaluation, monitoring, and analysis of relay protection systems. It enables engineers and researchers to interact directly with protection logic while it operates under realistic electrical conditions, providing a clear and accurate representation of how protection systems behave in real power networks.
Rather than acting as a simple configuration or control interface, the application functions as a live operational environment where protection decisions are continuously evaluated, visualized, and recorded. As input currents are processed, the application monitors their magnitude and duration in real time, automatically issuing a trip command whenever defined protection criteria are met. This behavior closely mirrors that of physical protection relays deployed in the field.
Protection Logic and Overcurrent Safety Mechanisms
Protection Logic & Safety Architecture
The HIL Protect Application uses a dual-layer safety architecture to ensure safe and realistic fault testing. It combines intelligent software-based protection with fast, independent hardware safeguards.
Why this matters:
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Replicates real-world protection behavior
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Prevents damage to sensitive power electronics
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Balances testing flexibility with physical safety
By separating configurable algorithms from fixed hardware limits, the system delivers both accuracy and reliability during aggressive test scenarios.
Overcurrent Algorithm Behavior
The application uses a time-delayed overcurrent protection algorithm that continuously monitors current levels and triggers only when limits are exceeded for a defined duration.
Key benefits:
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Avoids nuisance trips from short current spikes
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Accurately reflects real-world relay behavior
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Supports realistic short-circuit and stress testing
Implemented in Stateflow (MATLAB Simulink), the model is transparent and easy to validate, allowing engineers to review logic and adapt it for advanced testing scenarios.
Hardware-Level Optical Overcurrent Protection
To complement software protection, the system includes a dedicated optical overcurrent protection circuit as the final safety layer.
Key features:
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Factory-defined, non-configurable trip threshold
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Ultra-fast response to severe fault currents
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Independent of user-defined software settings
This hardware layer acts as the last line of defense, ensuring long-term reliability and preventing irreversible damage during extreme fault conditions.
Real-Time Monitoring, Logging, and Analysis
Real-Time Signal Monitoring
The application provides continuous real-time monitoring of all active input signals throughout the testing process. Engineers can observe system behavior as it happens, quickly detect abnormal operating conditions, and monitor performance trends without pausing or restarting tests. This live visibility improves test efficiency, reduces troubleshooting time, and supports confident decision-making during critical fault scenarios.
Automatic Signal Metrics & Evaluation
In addition to live signals, the system automatically calculates essential signal quality and performance metrics to support immediate analysis.
Available metrics include:
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Minimum and maximum values
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Peak-to-peak amplitude
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RMS and average values
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Estimated signal frequency
These measurements allow engineers to evaluate system health and response accuracy instantly, without manual calculations.
Data Logging & Post-Processing
For more detailed evaluation, the application supports structured data logging during operation. Recorded datasets can be exported for offline analysis, comparison between multiple test runs, and long-term documentation. This capability ensures test results are traceable and repeatable, making the system suitable for research, validation, and industrial verification workflows.
Key Use Cases of the Impedyme HIL Protection Application
Power Converter Testing
Validates overcurrent protection behavior in power converters before real fault exposure.
IGBT Fault Simulation
Tests semiconductor protection response to short-circuit and overcurrent events.
Motor Drive Analysis
Differentiates inrush currents from true fault conditions in motor applications.
Algorithm Development
Enables safe tuning and validation of protection algorithms in real time.
Factory Acceptance Testing
Confirms protection functionality prior to system delivery and deployment.
Research and Training
Provides a safe HIL platform for education and experimental validation.
Frequently Asked Questions
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Discover how the Impedyme HIL Protection Application enables real-time FPGA-based validation of protection algorithms.
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