IED Digital Input Delay Compensation
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Solution Overview
Problem
Conventional intelligent electronic devices (IEDs) are deficient in compensating for time delays in communication of data signals between IEDs and power system elements, leading to incorrect chronological ordering of time-stamped events and inability to accurately discern between valid and accidental data signals due to bouncing or ripple in the data signal.
Innovation Solution
A method and apparatus that includes a time delay element and an edge detection element to compensate for communication delays and differentiate between valid and accidental data signals, ensuring accurate recording and reporting of events by associating data with a corrected time reference and using debounce timing elements to filter out signal noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IEDs record events with time-stamps without delay compensation, then the recording process is simple and fast, but the chronological order of events is incorrect
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing delay compensation values for different input sources and event types before actual event recording occurs. The system determines expected delay times based on signal source characteristics and applies these pre-determined corrections to time-stamps, avoiding complex real-time calculations while ensuring accurate chronological ordering of events
Solution Approach 2:
The patent introduces an intermediary delay compensation mechanism that acts between the raw time-stamp generation and the final event recording. This intermediary layer calculates and applies delay corrections based on signal source characteristics, serving as a mediator that transforms inaccurate raw time-stamps into corrected chronological event records without requiring fundamental changes to the core recording system
2Reliability
If conventional IEDs record all data signals including bouncing signals, then the recording process is simple, but accidental state changes are misidentified as valid events
Solution Approach 1:
The patent applies the taking out principle by extracting and isolating the debounce timing function from the main event recording system. Dedicated debounce timing elements are introduced that specifically target and remove bouncing signals before they reach the event recording logic, separating the filtering function from the core recording mechanism to improve reliability without overwhelming complexity
Solution Approach 2:
The patent implements self-service by enabling the signal filtering mechanism to automatically identify and correct bouncing signals based on predefined timing characteristics without requiring external intervention or complex analysis. The debounce elements autonomously filter out accidental state changes by detecting signal stability patterns, allowing the system to self-correct recording accuracy issues
3Reliability
If debounce timing elements are added to filter bouncing signals, then event detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent applies local quality by implementing debounce timing elements selectively at specific input sources where bouncing signals are most problematic, rather than uniformly across all inputs. Each input source receives filtering appropriate to its characteristics, optimizing reliability improvement while minimizing overall device complexity by concentrating filtering resources where most needed
Data Source
AI summary
An apparatus and method for compensating digital input delay in an intelligent electronic device is provided. A method is provided which provides for accurate SER data recording while facilitating the reduction of processing burden on the IED and optimization of system performance during the processing of SER data flow. An apparatus is further provided which generally includes a time delay element coupled to a sequential events recorder for compensating for delay in communication of a data signal such that the sequential events recorder records a compensated time for a select event based on the clock and the time delay. An apparatus is provided which includes an edge detection element for detecting either a rising or falling edge from the data signal.