Gas Density Relay Contact Sampling Circuit for Safe Online Checks
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Solution Overview
Problem
Current gas density relay monitoring systems in high-voltage electrical equipment require periodic on-site checks, which are costly and pose safety risks due to the need for manual intervention, and existing systems are prone to electromagnetic interference and inefficiencies in monitoring gas density and moisture levels.
Innovation Solution
A contact signal acquisition circuit that connects to the gas density relay and an online check device, allowing for remote sampling of alarm and blocking signals, disconnecting the contact signal control loop during checks to prevent interference and ensuring safe operation, and reconnecting it after the check is completed to maintain normal monitoring functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual on-site checking of gas density relay is performed, then measurement precision can be ensured, but safety risks and operational costs increase due to personnel exposure to high-voltage equipment
Solution Approach 1:
The patent introduces an intermediary device (checking device with contact signal acquisition circuit) that remotely interfaces with the gas density relay through its contact terminals. This intermediary enables accurate checking of the relay's alarm and blocking contact signals without requiring personnel to physically approach the high-voltage equipment, thus maintaining measurement precision while eliminating safety risks associated with manual on-site checking.
2Reliability
If remote monitoring is implemented, then operational safety is improved, but measurement precision may deteriorate due to signal interference and transmission losses
Solution Approach 1:
The patent replaces manual mechanical checking operations with an automated electronic checking device. The device uses contact signal acquisition circuits to detect the state of alarm and blocking contacts electrically, substituting the mechanical/physical inspection process with an electronic measurement system that maintains precision while enabling remote operation and improving safety.
3Productivity
If continuous online monitoring is performed, then productivity is improved through automated monitoring, but device complexity increases due to additional circuitry and control systems
Solution Approach 1:
The checking device is designed with multi-functionality to justify its complexity: it can check multiple contact signals (alarm contact, blocking contact) of the gas density relay, provide remote monitoring capabilities, generate checking reports, and interface with existing high-voltage equipment standards. This universal design enables automated continuous monitoring that improves productivity while keeping the complexity manageable through integrated functionality.
Data Source
AI summary
A contact signal acquisition circuit for online checking a gas density relay on site is provided, including a first connecting circuit, connecting a contact of a gas density relay to a contact signal control loop, and a second connecting circuit, connecting a contact of the gas density relay to a contact signal sampling interface of an online check device. In a non-checking state, the second connecting circuit is disconnected, and the first connecting circuit is closed; and in a checking state, the first connecting circuit is disconnected, and the second connecting circuit is connected, so as to connect the contact of the gas density relay to the contact signal sampling interface of the online check device, guaranteeing that no contact action signal is uploaded during checking and safe operation of a power grid is not affected.