Transformer Partial Discharge Sensing With UHF Position Localization
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Solution Overview
Problem
Existing methods for detecting and locating partial discharges in transformers are inefficient, requiring multiple sensors and costly shutdowns, and existing ultrasonic and ultra-high frequency signal methods are not accurate enough.
Innovation Solution
A device with an omni-directional and directional ultra-high frequency sensor, along with a light sensor, is installed in a transformer's drain valve, allowing for high-accuracy detection and localization of partial discharges without shutting down the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection or experience-based methods are used to find partial discharge position, then inspection can be performed, but the transformer must be stopped and insulating oil drained, causing significant time and cost loss
Solution Approach 1:
The patent replaces mechanical inspection methods (visual inspection requiring opened transformer and drained oil) with electromagnetic field-based sensing. UHF sensors detect partial discharge signals through the transformer tank wall without mechanical access, and electronic signal processing locates the discharge position, eliminating the need to stop the transformer and drain oil.
2Measurement precision
If four or more sensors are installed inside the transformer for highly accurate position measurement, then measurement precision improves, but device complexity and installation cost increase
Solution Approach 1:
The patent extracts the sensors from the transformer interior and mounts them on the external tank surface. This allows accurate position measurement using fewer sensors (typically 2-3 external sensors suffice) compared to internal installation, simplifying the device while maintaining or improving measurement precision through external electromagnetic signal detection.
3Productivity
If ultrasonic signals are used for partial discharge detection, then detection can be performed in operating transformers, but the signal level is low making position measurement difficult
Solution Approach 1:
The patent changes the detection frequency parameter from ultrasonic (lower frequency) to ultra-high frequency (UHF, 300-3000 MHz). UHF signals have higher energy and better penetration characteristics, providing stronger signal levels for position measurement while maintaining the ability to detect partial discharges in operating transformers through the tank wall.
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
Enables rapid identification of defective parts, minimizing downtime and costs by accurately locating partial discharges in operating transformers, thereby preventing accidents.
Implementation Method 1
a method of estimating the location of the partial discharge using ultrasonic or ultra-high frequency signals in an operating transformer has been proposed
Implementation Method 2
a third sensor disposed within the case and detecting light within the transformer
Data Source
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AI summary
The present invention relates to a device for sensing a partial discharge of a transformer, the device detecting a partial discharge in a transformer and being capable of measuring the position thereof. The device for sensing a partial discharge of a transformer, according to one embodiment, may comprise: a case which is provided in the transformer and which has a hollow portion; an omni-directional first sensor which is disposed at one side in the case and which detects a partial discharge signal of the transformer; and a directional second sensor which is disposed at the other side in the case and which detects the partial discharge signal of the transformer.