Partial Discharge Antenna for Power Transformers
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Solution Overview
Problem
Existing partial discharge detecting devices for power transformers are limited in their ability to detect signals across multiple sub-bands due to physical restrictions on wavelength, which affects their wideband properties and noise resistance.
Innovation Solution
A partial discharge detecting device with an antenna unit sealed by an insulating sealing unit and a metal sealing unit, connected via a coaxial cable, which allows for the detection of signals across multiple sub-bands by adjusting the lengths of the insulating and metal sealing units to match resonant frequencies, enhancing antenna performance and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single antenna shape and identical shape are used, then the device structure is simple, but it is impossible to achieve wideband properties due to physical wavelength restrictions
Solution Approach 1:
The antenna is divided into multiple sections with different lengths (first antenna element, second antenna element, third antenna element) along the longitudinal axis. Each section has a different length to resonate at different frequency bands, enabling wideband operation without requiring multiple separate antennas. This segmentation allows the antenna to cover multiple frequency bands while maintaining a relatively compact single-structure design.
2Adaptability or versatility
If multiple receiving units are used to cover wide UHF band, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The antenna structure is designed to perform multiple functions by detecting electromagnetic waves from partial discharge across different frequency bands simultaneously. The same antenna structure serves as both the radiating element and the resonating structure for multiple bands, eliminating the need for separate receiving units for each frequency band. This multi-functional design achieves wideband coverage while keeping the device structure relatively simple.
3Adaptability or versatility
If the antenna is disposed within the drain valve, then no separate inspection window is needed and sensor arrangement is flexible, but the antenna must fit within limited space
Solution Approach 1:
The antenna elements are arranged along the longitudinal axis of the drain valve, utilizing the axial dimension for placement. By distributing the antenna elements along the length of the drain valve rather than spreading them out laterally, the design fits the antenna structure within the limited radial space of the drain valve while maintaining the necessary element spacing for wideband operation.
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 effectively receives and measures partial discharge signals across a wide range of frequency bands, improving antenna performance and enabling detection of signals with different wavelengths, thereby enhancing the diagnosis of power transformer conditions.
Implementation Method 1
the sum of a length of the insulating sealing unit and a length of the metal sealing unit may be proportional to a wavelength for a resonant frequency
Data Source
AI summary
The present invention relates to a device for detecting a partial discharge for a power transformer which detects an electromagnetic signal occurring due to faulty insulation. The device includes an antenna unit receiving electromagnetic waves, an insulator including the antenna unit, a metallic air-tight unit that seals a connector connected to the insulator and connecting a coaxial cable, and the coaxial cable exposed to the outside of the metallic air-tight unit. Thus, it is possible to enhance broadband properties through an internal conductor of a drain valve.