Redundant Protection Modules in Intelligent Electronic Devices
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Solution Overview
Problem
Intelligent electronic devices (IEDs) in electric power delivery systems face misoperation issues due to complex configurations and redundant systems, leading to increased failure rates and service disruptions, as they struggle to accurately detect electrical disturbances without causing false tripping or reducing availability.
Innovation Solution
Implementing a microprocessor-based IED configuration with primary and redundant protection modules that utilize redundant electrical measurement inputs to verify the detection of electrical disturbances, allowing for accurate fault determination without increasing system complexity or failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If redundant protection modules are added to verify electrical disturbances, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single IED to perform multiple protection functions simultaneously. The IED is configured with various protection modules (overcurrent, distance, differential, etc.) that can operate independently or in combination, allowing one device to replace multiple specialized devices while maintaining comprehensive protection capabilities and verification functionality.
Solution Approach 2:
The patent combines primary protection and verification functions into a single integrated IED system. Multiple protection modules and verification logic are merged within one device, consolidating what would traditionally require separate devices. This merging reduces overall system complexity while providing both accurate detection and verification capabilities through the unified IED architecture.
2Measurement precision
If multiple protection modules are configured in the IED, then detection accuracy is improved, but failure rate increases
Solution Approach 1:
The patent implements feedback mechanisms where the IED continuously monitors its own operation and the status of multiple protection modules. The verification module uses feedback from primary protection module outputs to cross-check detection results. This self-verification feedback loop identifies and isolates potential failures, preventing single points of failure from causing system-wide issues and thereby improving overall reliability despite having multiple modules.
Solution Approach 2:
The patent applies prior cushioning by incorporating verification logic that proactively checks the validity of protection module outputs before they can cause false tripping. The system prepares verification mechanisms in advance that can detect and neutralize potential errors from any protection module, cushioning against the increased failure risk that comes with having multiple modules operating simultaneously.
3Reliability
If verification logic is implemented to confirm electrical disturbances, then misoperation is reduced, but service disruptions increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring verification logic and validation rules within the IED that automatically execute when protection modules detect disturbances. Rather than requiring manual verification or complex decision-making processes, the system has preliminary automated checks in place that quickly validate or reject disturbance detections, reducing misoperation while minimizing the time required for verification and thus reducing service disruptions.
Data Source
AI summary
Disclosed herein are systems and methods for leveraging the inherent redundancy of electrical measurement inputs available to microprocessor-based intelligent electronic devices (IEDs). Specifically, an IED may receive a plurality of electrical measurements associated with an electric power delivery system, such as measurements associated with a generator. A first protection module may be configured to detect a first type of electrical disturbance using a first subset of the plurality of electrical measurements. A second protection module may be configured to detect a second type of electrical disturbance using a second subset of the plurality of electrical measurements. A first redundant protection module may be configured to verify the detection of the first type of electrical disturbance using at least a portion of the second subset of the plurality of electrical measurements.