Time Synchronization Detection for Real-Time Measuring Devices
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Solution Overview
Problem
Current methods for detecting time synchronization ability in real-time measuring devices at power stations are inadequate, often relying on qualitative validation and failing to accurately assess the time synchronization of Intelligent Electronic Devices (IEDs), leading to incorrect time sequences and illogical fault analysis in power systems.
Innovation Solution
A method involving a system with a real-time measuring device, a standard satellite synchronous time service device, a multi-channel storage oscilloscope, an AC source, and a controllable time scale signal source, which changes alternating input signal intensity and switch input signal status at designated times to detect time synchronization deviations, forming a purely resistive loop to assess the device's ability to apply time synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If qualitative validation methods are used to detect time synchronization ability, then the detection process is simple, but the measurement precision is insufficient leading to inaccurate assessment of IED time synchronization
Solution Approach 1:
The patent introduces a time controllable switch as an intermediary device to generate standardized test signals with known breaking times. This mediator enables precise measurement of time synchronization by providing a reference signal that the IED must accurately timestamp, thereby resolving the contradiction between measurement precision and system complexity through the use of a dedicated intermediate testing component
Solution Approach 2:
The patent employs parameter changes by varying the breaking time values of the test signals generated by the time controllable switch. By changing the time parameters of the input signals and measuring the corresponding breaking time values recorded by the IED, the system achieves quantitative assessment of time synchronization accuracy without requiring overly complex detection apparatus
2Measurement precision
If source-traceable time quantitative detection method is used, then the measurement precision is improved, but the device complexity increases due to multiple detection links
Solution Approach 1:
The patent extracts the time synchronization detection function into a separate, dedicated testing system consisting of a time controllable switch, oscilloscope, and signal generator. This extraction allows the complex quantitative detection process to be performed independently using specialized equipment, while the IED itself remains unchanged, thereby achieving high measurement precision without complicating the overall power station detection infrastructure
Solution Approach 2:
The detection process is segmented into distinct functional components: signal generation by the time controllable switch, signal transmission through controlled channels, timestamping by the IED, and measurement verification by the oscilloscope. This segmentation allows each component to be optimized independently for its specific function, achieving high overall measurement precision while managing system complexity through modular design
Data Source
AI summary
A method for detecting a time synchronization ability of the real-time measuring device based on a time variable is provided. On a premise that the real-time measuring device correctly receives time service signals, the method aims at detecting time synchronization signal application ability of the real-time measuring device, and involves a purely resistive loop comprising a value transferring device and a time controllable switch. The method, via a time synchronization performance thereof, relatively completely reflects the time synchronization signal application ability of the device within a value transfer requirement. The method is a development upon power station time synchronization time service signals and transmission accuracy detection and an improvement of power station time synchronization detection procedures. The method facilitates improving real-time analysis and monitoring abilities of a power station and a power grid to a primary device and a primary system.