Gas Density Relay Calibration Without Disassembly or SF6 Leakage
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Solution Overview
Problem
Existing SF6 gas density relays in electrical equipment face issues with inflexibility, poor contact, and temperature compensation degradation, leading to false operations, and current calibration methods require additional valves or disassembly, which are impractical or risky.
Innovation Solution
A calibration device and method that adjusts temperature and pressure without additional valves or disassembly, using a temperature adjusting mechanism, pressure sensors, and a computer data processing system to accurately calibrate gas density relays, ensuring zero gas emission and environmental compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional density relay calibration valve is installed, then calibration function is achieved, but device complexity increases and seismic performance degrades
Solution Approach 1:
The patent introduces a calibration device as an intermediary system that connects to the existing density relay through its output circuit. This mediator provides calibration functionality without modifying the density relay structure or adding valves, thereby resolving the contradiction between achieving calibration function and maintaining device simplicity.
Solution Approach 2:
The patent replaces the mechanical valve-based calibration approach with an electronic calibration system that uses the existing electrical circuit of the density relay. By substituting mechanical components with electronic control, the system achieves calibration functionality without increasing mechanical complexity or affecting seismic performance.
2Ease of manufacture
If density relay is disassembled for calibration, then internal components are accessible, but gas leakage risk increases
Solution Approach 1:
The patent enables the density relay to be calibrated through its own existing electrical circuit and output signals without requiring disassembly. The calibration device utilizes the relay's inherent electrical characteristics to perform calibration, allowing the system to serve itself for maintenance purposes while maintaining gas sealing integrity.
Solution Approach 2:
The calibration device acts as an external intermediary that interfaces with the density relay's electrical output rather than its mechanical structure. This approach provides calibration accessibility through the electrical domain while keeping the mechanical sealing intact, thus preventing gas leakage.
3Ease of operation
If conventional calibration method is used, then contact action is achieved, but SF6 gas emission occurs
Solution Approach 1:
The patent replaces the mechanical gas-pressure-based calibration method with an electronic measurement approach. By using the density relay's own output circuit and electrical signals for calibration, the system eliminates the need to manipulate SF6 gas physically, thereby preventing gas emission while maintaining calibration operability.
Solution Approach 2:
The calibration device serves as an electronic intermediary that measures and calibrates the density relay through its electrical output signals rather than through physical gas manipulation. This intermediary approach enables calibration operation while avoiding direct contact with and emission of SF6 gas.
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
Accurate calibration of gas density relays is achieved without disassembly, maintaining equipment integrity and compliance with environmental regulations, while avoiding gas leakage and seismic performance degradation.
Implementation Method 1
temperature rise and fall of the temperature compensation element of the gas density relay is adjusted through the temperature adjusting mechanism
Implementation Method 2
the gas density value is obtained according to the pressure value and the temperature value in the contact action
Implementation Method 3
at least one temperature sensor
Data Source
Figure 1~2
Figure 3~4
AI summary
The present application provides a gas density relay check device and a check method thereof, comprising a temperature adjusting mechanism, at least one pressure sensor, at least one temperature sensor, a computer data processing system and a contact signal sampling unit. In check, the temperature adjusting mechanism and the gas density relay are relatively set, temperature rise and fall of the temperature compensation element of the gas density relay is adjusted through the temperature adjusting mechanism, then the gas density relay is enabled to have a contact signal action, the gas density value is obtained according to the pressure value and the temperature value in the contact action, the contact signal operating value of the gas density relay is detected, and check on the contact signal operating value of the gas density relay is completed. The gas density relay check device of the present application is capable of accurately checking gas density relays of various measuring principles in various situations, and is particularly applicable to a gas density relay without a three-way valve, and check can be achieved without disassembling the gas density relay.