Gas Density Relay Self-Checking for SF6 Monitoring Reliability
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Solution Overview
Problem
Current gas density monitoring systems for high-voltage electrical apparatuses, particularly those using SF6 gas, require regular maintenance and manual inspections, which are costly and inefficient, and can lead to safety issues due to reduced gas density and water content affecting insulation and arc control performance.
Innovation Solution
A maintenance-free gas density relay with integrated gas density detection sensors and an intelligent control unit that performs online self-checks and mutual checks, comparing pressure, temperature, and density values to determine the operational state of the monitoring system, reducing the need for manual maintenance and ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular manual inspection and maintenance of gas density relay is performed, then safety and reliability are ensured, but labor costs and maintenance burden increase
Solution Approach 1:
The gas density relay is equipped with self-diagnosis functionality that automatically detects and reports its own operational status, eliminating the need for manual inspections. The device monitors its own sensors and internal components, generating maintenance-free operation through automated self-checks
Solution Approach 2:
The system implements automated feedback mechanisms where the gas density relay continuously monitors its own operational parameters and provides real-time status information. This feedback loop enables the system to detect anomalies and alert operators without requiring manual intervention, thereby ensuring reliability while reducing maintenance burden
2Reliability
If manual inspection of gas density relay is conducted, then operational status is confirmed, but time and resource consumption increase
Solution Approach 1:
The gas density relay performs continuous automated monitoring and self-diagnosis without interruption. The system continuously verifies its own operational status, sensor functionality, and gas density measurements, eliminating the periodic time loss associated with manual inspections while maintaining constant reliability verification
3Measurement precision
If multiple sensors are used for gas density monitoring, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent combines multiple sensors (pressure sensors and temperature sensors) into an integrated gas density monitoring system. By merging these sensors and implementing automated cross-validation algorithms, the system achieves high measurement precision while managing complexity through unified design and automated processing of sensor data
4Ease of operation
If automated self-check system is implemented, then maintenance requirements are reduced, but system complexity increases
Solution Approach 1:
The gas density relay implements self-service through automated self-diagnosis and self-monitoring capabilities. The device automatically checks its own sensors, processing units, and operational status, reducing maintenance requirements while managing complexity through intelligent automation rather than mechanical complexity
Data Source
AI summary
Provided are a maintenance-free gas density relay and a mutual check method therefor. The maintenance-free gas density relay includes a gas density relay body and first gas density detection sensors which are in communication on gas paths, and an intelligent control unit connected to the gas density relay body and the first gas density detection sensors separately, where the intelligent control unit compares and checks a first pressure value and a second pressure value acquired at the same gas pressure, and/or compares and checks a first temperature value and a second temperature value acquired at the same gas temperature, or compares and checks a first density value and a second density value acquired at the same gas density, and can further upload received data to a background for data comparison by the background. The present disclosure further completes online self-check or mutual check of the gas density relay while being used for monitoring gas density of a gas-insulated or arc-control electrical apparatus, thereby improving efficiency, avoiding maintenance, reducing cost, and ensuring safe operation of a power grid.