Gas Density Relay Online Self-Check via Temperature Compensation
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Solution Overview
Problem
Current gas density monitoring systems for SF6 high-voltage electrical equipment face challenges in harsh environments, particularly strong electromagnetic interference, and require regular manual checks, which are costly and pose safety hazards due to potential operational errors.
Innovation Solution
A gas density relay with an online self-check function, comprising a gas density relay body, a detection sensor, a temperature regulating mechanism, an online check contact signal sampling unit, and an intelligent control unit, allowing for autonomous temperature and pressure regulation and monitoring, enabling self-diagnostic capabilities without additional hardware or maintenance personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual checking of gas density relays is performed regularly, then the reliability of monitoring is improved, but the operational cost and safety risks increase
Solution Approach 1:
The gas density relay performs self-checking of its mechanical contacts automatically without requiring external manual intervention. The relay uses its own internal resources to detect contact performance degradation and generates alarm signals when checking parameters exceed thresholds, eliminating the need for regular manual checks by maintenance personnel.
2Extent of automation
If additional checking equipment and hardware are added to enable self-checking, then the automation level is improved, but the device complexity increases
Solution Approach 1:
The gas density relay integrates multiple functions into a single device: it performs its primary gas density monitoring function while simultaneously conducting self-checking of its mechanical contacts. The relay uses its existing internal components (power supply, control circuitry, alarm output) for both monitoring and self-diagnosis, avoiding the need for separate dedicated checking equipment.
Solution Approach 2:
The invention introduces a checking parameter (such as contact resistance or contact force) that serves as an intermediary to assess the performance of mechanical contacts. By monitoring this intermediate parameter, the system can infer contact health status without directly complex mechanical inspection, simplifying the overall checking mechanism.
3Reliability
If the gas density relay performs frequent self-checks, then the reliability is improved, but the energy consumption increases
Solution Approach 1:
The gas density relay performs self-checking of mechanical contacts at periodic intervals rather than continuously. The relay is configured to check contact parameters at predetermined time intervals or under specific conditions (such as when alarm functions are activated), reducing energy consumption while maintaining adequate monitoring reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability and efficiency of gas density monitoring, reduces operational costs, and ensures safe and reliable operation of high-voltage electrical equipment by enabling real-time, autonomous self-checks and reducing the need for manual interventions.
Implementation Method 1
a temperature compensation element in the gas density relay body
Implementation Method 2
a pressure detector, and a temperature transducer, which are respectively connected with the intelligent control unit
Implementation Method 3
The temperature regulating mechanism is a heating element; or the temperature regulating mechanism mainly consists of the heating element
Data Source
AI summary
The modification method for the gas density relay, the gas density relay with the online self-check function and the check method thereof provided by this application are used for high-voltage and medium-voltage electrical equipment, including a gas density relay body, a gas density detection sensor, a temperature regulating mechanism, an online check contact signal sampling unit and an intelligent control unit. Regulate temperature rise and fall of the temperature compensation element of the gas density relay body through the temperature regulating mechanism, which leads to a contact action of the gas density relay body, the contact action is transferred to the intelligent control unit through the online check contact signal sampling unit, and the intelligent control unit detects the operating value and/or return value of the contact signal of the gas density relay body based on the density value at the time of contact action. The gas density relay check can be completed without maintainer at the site, so as to realize free maintenance, greatly improve the reliability of power grid, increase work efficiency and reduce the cost.