Multi-Channel Partial Discharge Detection Device Using Triggered Sampling
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Solution Overview
Problem
Conventional partial discharge detection devices face challenges such as missing partial discharge signals due to intermittent acquisition methods and high costs associated with continuous acquisition methods that require high-speed oscilloscopes and acquisition cards.
Innovation Solution
A rapid detection device for multi-channel sporadic transient partial discharge is developed, comprising a CPU and multiple partial discharge detection circuits. Each circuit includes a partial discharge pulse signal processing module, a reference voltage processing module, a comparator, and a trigger, enabling continuous and rapid detection of partial discharge signals without missing any.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If intermittent acquisition method is used, then cost is reduced, but partial discharge signals may be missed
Solution Approach 1:
The patent employs periodic sampling at critical moments by using a trigger mechanism that activates the acquisition system when partial discharge events are detected. This periodic action occurs at the right moments to capture transient signals without requiring continuous high-speed acquisition, thus reducing cost while maintaining detection completeness.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that uses a preliminary detection stage to identify when partial discharge signals are present. This intermediary system triggers the main acquisition system only when needed, acting as a mediator between continuous and intermittent acquisition modes to avoid missing signals while reducing overall system cost.
2Reliability
If continuous acquisition method is used, then no partial discharge signal is missed, but cost increases due to high-speed oscilloscopes and acquisition cards
Solution Approach 1:
Instead of continuous acquisition, the system uses periodic sampling triggered by detected partial discharge events. This approach maintains detection completeness by acquiring data at the right moments while dramatically reducing the required sampling rate and system cost.
Solution Approach 2:
The system dynamically adjusts its acquisition mode based on detected conditions. When partial discharge is detected, the system switches to high-speed acquisition; when no discharge is present, it operates in a lower-speed or standby mode. This dynamic adaptation maintains reliability while reducing average system cost.
3Speed
If high-speed oscilloscopes and acquisition cards are used, then sampling frequency reaches 3 GHz, but device complexity and cost increase
Solution Approach 1:
The patent segments the detection system into multiple functional modules: a preliminary detection stage using simpler components, a trigger generation stage, and a high-speed acquisition stage activated only when needed. This segmentation allows the system to achieve high sampling frequency when required while using simpler, lower-cost components for the majority of operation time.
Solution Approach 2:
The system uses periodic high-speed acquisition triggered only when partial discharge events are detected, rather than maintaining continuous high-speed operation. This periodic activation of the high-speed sampling capability reduces the average complexity and cost requirements while maintaining the ability to capture transient signals at 3 GHz when needed.
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 device achieves continuous and rapid detection of sporadic transient partial discharge signals with a simple structure and low cost, effectively addressing the issues of signal missed and high cost in conventional technologies.
Implementation Method 1
The comparator (U2) is configured to compare a processed partial discharge pulse signal with a processed reference voltage, and output a first level signal to the trigger (U3)
Implementation Method 2
The trigger (U3) is configured to process and lock the level signal, and transmit a second level signal to an input terminal of the CPU through the output terminal (Q)
Implementation Method 3
The partial discharge pulse signal processing module is configured to sequentially perform voltage amplitude limit protection, impedance matching, band-pass filtering, amplification and filtering on the partial discharge pulse signal
Implementation Method 4
the reference voltage processing module is configured to sequentially perform conversion, amplification and filtering on a reference voltage
Data Source
AI summary
A rapid detection device for multi-channel sporadic transient partial discharge, comprising a CPU and several partial discharge detection circuits. The partial discharge detection circuits are connected to a plurality of ports of the CPU one to one, respectively. First, a partial discharge pulse signal is filtered and amplified by means of a partial discharge pulse signal processing module in the partial discharge detection circuits, and is then inputted to a comparator, and a reference voltage passes through the CPU and is sent to a reference voltage processing module for amplification, filtering and other processing, and then is inputted to the comparator, so that the comparator processes same according to the partial discharge pulse signal and the reference voltage and then inputs same to a trigger. Finally, according to a level signal at an output terminal of the trigger, the CPU determines whether partial discharge occurs in a circuit to be detected. The detection device of the present application is simple in structure and low-cost. Moreover, the detection device may continuously and quickly detect sporadic transient partial discharge signals without missing detection, thereby solving the technical problems in the prior art of easily missed detection and high costs.