Gas Density Relay Self-Checking for Remote Contact Verification
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Solution Overview
Problem
Current gas density relays in high-voltage and medium-voltage electrical equipment require regular on-site maintenance, which is costly, inefficient, and poses safety risks, while existing online monitoring systems lack comprehensive self-check functionality.
Innovation Solution
A gas density relay with integrated sensors and an intelligent control unit that allows for online self-checks, including a pressure sensor, temperature sensor, force measuring sensor, and driving contact action mechanism, enabling remote monitoring and maintenance-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If on-site manual checking of gas density relay is performed, then measurement precision is ensured, but loss of time and productivity decrease due to required on-site intervention
Solution Approach 1:
The gas density relay performs self-checking by automatically driving the contact action mechanism to simulate external checking operations. The relay monitors its own contact signal actions and compares them against expected values, enabling autonomous verification without requiring external testers or on-site personnel intervention.
Solution Approach 2:
The system implements feedback by detecting the contact signal actions generated during self-checking and comparing them with preset standard values. The intelligent control unit analyzes the detected values and provides feedback to determine whether the gas density relay is functioning normally, enabling closed-loop verification.
2Reliability
If on-site checking with testers and equipment vehicles is deployed, then reliability of gas density relay is ensured, but device complexity and cost increase
Solution Approach 1:
The checking functions are merged into the gas density relay itself. The relay integrates the pressure detection element, temperature compensation element, contact action mechanism, and intelligent control unit into a single device, eliminating the need for separate external testers and checking equipment.
Solution Approach 2:
The gas density relay performs multiple functions simultaneously: it monitors gas density, performs self-checking of its contact mechanisms, and provides diagnostic information. This multi-functionality replaces the need for specialized checking equipment and skilled operators.
3Object-affected harmful factors
If regular on-site inspection is conducted, then safety hazards are reduced, but loss of substance increases due to SF6 gas handling requirements
Solution Approach 1:
The relay performs self-verification without requiring external intervention, eliminating safety risks associated with on-site personnel exposure to SF6 gas. The system checks its own functionality remotely, preventing harmful exposures while maintaining monitoring accuracy.
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
Enables reliable, efficient, and cost-effective monitoring of gas density without on-site intervention, improving grid reliability and reducing maintenance costs while adhering to environmental regulations.
Implementation Method 1
a first pressure sensor, connected to the pressure detection element of the gas density relay body
Implementation Method 2
a temperature sensor, and configured to complete the control of the driving contact action mechanism, pressure value acquisition and temperature value acquisition
Implementation Method 3
The force measuring sensor, which is arranged on the driving contact action mechanism or in the housing, is configured to detect the force exerted by the driving contact action mechanism on the gas density relay body
Data Source
AI summary
The application provides a gas density relay with online self-check function and its check method, which are used for high voltage and medium-voltage electrical equipment. The gas density relay includes a gas density relay body, a first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact action mechanism and an intelligent control unit. The driving contact action mechanism is configured to directly or indirectly drive the signal action mechanism of the gas density relay body to displacement, so that the gas density relay body will have contact signal action. The intelligent control unit will detect the alarm and/or blocking contact signal action value and/or return value of the gas density relay body according to the density value when the contact acts. Checking the gas density relay can be completed without maintainer coming to the site, which improves the reliability of the power grid, improves the efficiency, reduces the operation and maintenance cost, and can implement the maintenance free of the gas density relay.