Gas Density Relay Self-Checking for Remote SF6 Contact Verification
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Solution Overview
Problem
Current gas density relays require regular on-site checks, which are costly, time-consuming, and pose safety risks due to the need for maintainers to visit high-voltage electrical equipment.
Innovation Solution
A gas density relay with an online self-check function, incorporating a gas density relay body, pressure sensors, a temperature sensor, a pressure regulating mechanism, an online check contact signal sampling unit, and an intelligent control unit, allowing for automated self-checks without the need for on-site maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular on-site checks are performed manually, then the gas density relay can be inspected, but it incurs high costs, consumes time, and poses safety risks
Solution Approach 1:
The gas density relay is equipped with self-checking capabilities where the relay itself performs verification of its internal components (pressure sensor, temperature sensor, signal generator) without requiring external maintenance personnel. The microcontroller automatically executes checking routines and generates check reports, enabling the device to self-diagnose and self-verify its operational status.
Solution Approach 2:
The patent replaces manual mechanical inspection with automated electronic detection. The microcontroller electronically tests the pressure sensor, temperature sensor, and signal generator through electrical signals and data processing, substituting the need for physical on-site examination by maintenance personnel with automated electronic verification systems.
2Reliability
If manual on-site checks are conducted, then the gas density relay can be verified, but maintenance costs and safety risks increase
Solution Approach 1:
The relay performs automated self-checking of its critical components including the pressure sensor, temperature sensor, and signal generator. The microcontroller automatically verifies the functionality of these components and generates check reports, eliminating the need for expensive external maintenance services while ensuring continuous accuracy verification.
Solution Approach 2:
The system incorporates feedback mechanisms where the microcontroller continuously monitors the status of sensors and signal generators, compares readings against expected values, and generates check reports indicating the operational status. This feedback loop ensures ongoing verification of accuracy without requiring external intervention or additional maintenance costs.
3Reliability
If frequent on-site inspections are performed, then safety hazards can be detected, but operational disruption increases
Solution Approach 1:
The gas density relay performs continuous or periodic self-checking operations without requiring shutdown or interruption of the electrical equipment. The automated checking system operates independently, continuously verifying the functionality of pressure sensors, temperature sensors, and signal generators while the main equipment remains operational, thus maintaining both safety and productivity.
Solution Approach 2:
The patent replaces disruptive manual inspection processes with non-intrusive automated electronic checking. The microcontroller electronically tests components through software routines without requiring physical access or operational interruption, substituting the need for maintenance personnel to visit the site with remote automated verification that maintains continuous operation.
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 enables reliable, efficient, and cost-effective monitoring and maintenance of gas density relays, improving the safety and reliability of high-voltage electrical equipment by eliminating the need for frequent on-site checks and reducing SF6 gas discharge.
Implementation Method 1
a pressure sensor, a temperature sensor, a signal generator and a signal regulating mechanism arranged in the housing
Implementation Method 2
a pressure sensor, a temperature sensor, a signal generator and a signal regulating mechanism arranged in the housing
Data Source
AI summary
The application provides a gas density relay with online self-check function and its check method, including a gas density relay body, a first pressure sensor, a second pressure sensor, a temperature sensor, a gas chamber, a pressure regulating mechanism, an online check contact signal sampling unit and an intelligent control unit. The air path of the pressure regulating mechanism is connected to the gas pressure chamber and the second pressure sensor; Pressure rise and fall can be regulated through the pressure regulating mechanism to make the gas density relay body contact action. The contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the action value and/or return value of the contact signal of the gas density relay body according to the density value when the contact acts, and completes the check work without requiring maintainer to go to the site for check. At the same time, because the pressure regulating mechanism is not connected to the SF6 gas path of the gas density relay body or electrical equipment, its sealing requirements are reduced, the reliability of the power grid is improved, and the manufacturing cost is reduced.