Partial Discharge Detection Using Resistive Attenuation
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Solution Overview
Problem
Existing partial discharge detection methods are inconsistent across different devices due to variations in host measuring units and surge impulse strengths, and they often eliminate significant signal information prior to analysis, leading to unreliable results.
Innovation Solution
The implementation of a resistive attenuation concept using high voltage precision resistors, which allows the entire frequency spectrum to pass through non-inductive thick film resistors, reducing voltage levels for digitization and analysis, and incorporating a high voltage resistor divider to manage impulse surges, enabling efficient detection of partial discharge signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection methods (antennas, coupling capacitors, current transformers) are used, then detection can be performed, but results are inconsistent across different devices and significant signal information is lost
Solution Approach 1:
The patent replaces traditional electromagnetic detection methods (antennas, coupling capacitors, current transformers) with a direct resistive voltage division approach. This substitution eliminates the information loss and inconsistency associated with electromagnetic coupling by directly measuring voltage through high-voltage resistors, providing consistent results across different devices while preserving the entire signal spectrum.
Solution Approach 2:
The patent changes the detection parameter from electromagnetic field coupling to direct voltage measurement through resistive division. By measuring voltage directly across high-voltage resistors rather than coupling electromagnetic signals, the system achieves consistent detection results and preserves complete signal information without the losses inherent in traditional electromagnetic methods.
2Measurement precision
If high voltage direct measurement is used, then voltage level is high for detection, but it risks damage to measuring units and requires complex protection circuits
Solution Approach 1:
The patent segments the high voltage measurement function across multiple high-voltage resistors arranged in series. This segmentation allows the full voltage to be measured accurately while each individual resistor handles only a portion of the total voltage, reducing the risk of damage to any single component and eliminating the need for complex protection circuits.
Solution Approach 2:
The patent introduces high-voltage resistors as intermediary elements between the high voltage source and the measuring unit. These resistors serve as a protective interface that steps down the voltage to safe levels for measurement while preserving signal integrity, thereby protecting the measuring unit from voltage damage without requiring additional protection circuits.
3Reliability
If frequency filtering is applied prior to analysis, then noise is reduced, but significant signal information is eliminated
Solution Approach 1:
The patent performs voltage attenuation through resistive division before any filtering or analysis operations. By establishing the complete voltage signal first through accurate resistive measurement, the system preserves the entire frequency spectrum for subsequent analysis, allowing noise reduction and signal enhancement to be performed on the complete signal rather than having information lost during preliminary filtering.
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
This approach provides consistent and efficient detection of partial discharges across various devices, reducing manufacturing costs and allowing for flexible analysis, as it captures the entire signal spectrum without directional or signal reception issues, and enables integration with the surge board for comparative analysis.
Implementation Method 1
The high voltage resistor divider can reduce a voltage peak of an impulse surge generated by a surge board
Data Source
AI summary
The disclosure herein relates to a partial discharge detection board comprising a high voltage resistor divider. The high voltage resistor divider can reduce a voltage peak of an impulse surge generated by a surge board. The high voltage resistor divider can also include a high side with a first resistance and a low side with a second resistance.