Protective Relay Inspection Planning for Error-Free Function Testing
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Solution Overview
Problem
The existing methods for inspecting protective relays in electrical systems rely heavily on manual manipulation, which can lead to human error, affecting the accuracy and reliability of the inspection process and potentially causing power system accidents.
Innovation Solution
A protective relay inspection device that automatically inspects each relay element using a connector and an inspector configured to receive relay setting information, creating an inspection plan and processing the relay function based on this information, thereby reducing the need for manual intervention and maintaining the relay setting information unchanged during the inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual manipulation is used to change relay setting information for inspection, then the inspection can be performed, but human error occurs leading to decreased accuracy and reliability
Solution Approach 1:
The inspection device automatically performs relay function inspection by itself without requiring user intervention. The device reads relay setting information, automatically changes settings for inspection, and restores original settings, making the system self-sufficient and eliminating human error in the inspection process
Solution Approach 2:
The patent replaces manual mechanical manipulation of relay settings with an automated electronic inspection device that communicates with the relay through a connector. The device electronically reads, modifies, and restores relay setting information without physical user interaction, substituting mechanical manual operations with automated electronic control
2Reliability
If manual manipulation is used to restore relay setting information after inspection, then the settings can be restored, but human error may cause settings to remain changed
Solution Approach 1:
The inspection device implements a feedback mechanism that automatically monitors the relay setting information throughout the inspection process. After inspection, the device reads the current settings, compares them with the original settings, and automatically restores any changes, ensuring the relay returns to its initial state without requiring manual verification or intervention
Solution Approach 2:
The device performs preliminary actions by automatically saving the original relay setting information before inspection begins. This pre-saved information is then used to automatically restore the settings after inspection, eliminating the need for manual restoration and ensuring accurate recovery of the original configuration
3Measurement precision
If automated inspection is implemented, then human error is eliminated, but device complexity increases
Solution Approach 1:
The inspection device is designed with multi-functionality to reduce overall system complexity. It can inspect multiple relay elements (overcurrent, ground fault, frequency, etc.), automatically manage setting information, and interface with various relay types through a standardized connector, consolidating multiple functions into a single universal device
Solution Approach 2:
The patent introduces a standardized connector as an intermediary between the inspection device and the relay. This connector simplifies the interface complexity by providing a unified communication protocol and physical connection method, allowing the inspection device to interact with different relay models without requiring complex custom interfaces for each device
Data Source
AI summary
An example of the present disclosure provides a protective relay inspection device including: a connection unit connected to a protective relay; and an inspection unit which, upon receiving a relay setting-providing signal including relay setting information for the protective relay via the connection unit, processes an inspection of a relay function of the protective relay on the basis of the relay setting-providing signal. Here, the inspection unit includes: a plan generation unit which generates inspection plan information for an automatic inspection function on the basis of the relay setting-providing signal; and an inspection processing unit which inspects the relay function of the protective relay on the basis of the inspection plan information.