Transformer Partial Discharge Detection via Shielding Wall Opening
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Solution Overview
Problem
Conventional partial discharge detection devices for transformers fail to detect signals generated in partitioned portions within the transformer due to shadow zones, limiting their detection capabilities.
Innovation Solution
A partial discharge detection device with coils wound around a core, installed in an outer casing, and a shielded portion with an opening in the shielding wall to allow signal transfer, along with a detector body and antenna unit to communicate between the internal and external spaces, enabling detection of signals within the shadow zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding wall is used to partition the transformer internal space, then electromagnetic interference is reduced and insulation is improved, but shadow zones are created that prevent detection of partial discharge signals
Solution Approach 1:
A signal transfer unit is introduced as an intermediary component between the shielded internal space and the external detection space. This unit includes a signal transfer opening that allows partial discharge signals to pass through the shielding wall, enabling the antenna to detect signals from regions that would otherwise be in shadow zones. The intermediary structure maintains the shielding function while creating a controlled pathway for signal transmission.
2Measurement precision
If the antenna unit is positioned to detect partial discharge signals, then detection sensitivity is improved, but the antenna cannot access signals from partitioned portions due to the shielding wall
Solution Approach 1:
The signal transfer opening extends in the vertical direction through the shielding wall, creating a three-dimensional signal pathway. This vertical dimension allows the antenna, positioned externally, to receive signals from the internally shielded region without compromising the horizontal shielding effectiveness. The opening provides a dedicated spatial channel that bypasses the shielding barrier.
3Reliability
If the shielding wall is made more extensive to improve insulation, then electromagnetic protection is enhanced, but the shadow zone expands and prevents signal detection
Solution Approach 1:
The shielding wall is designed with differentiated local properties: the majority of the wall maintains full shielding characteristics for electromagnetic protection, while the signal transfer opening provides a localized region with signal transmission capability. This local quality variation allows the shielding structure to simultaneously achieve both electromagnetic protection and signal detectability in specific regions.
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 solution increases detection sensitivity by allowing partial discharge signals to be smoothly transferred through the opening portion, enabling reliable detection of signals that were previously undetectable, improving the overall detection capability.
Implementation Method 1
an antenna unit installed in the detector body and configured to detect a partial discharge signal generated in the transformer
Data Source
AI summary
Provided is a partial discharge detection device for a transformer, and a transformer using the same. An on-load tap changer is provided on one side of the outer casing of a transformer, and is partitioned from the inside of the outer casing by a shielding wall. A drain pipe is formed on one side of the outer surface of the outer casing. A drain valve is installed in the drain pipe. A configuration for detecting a partial discharge signal generated within the transformer is installed in the drain pipe. That is, a detector body is installed within the drain pipe and the drain valve. A connection mounting member is installed in an end portion of the drain valve. The detector body penetrates the connection mounting member. In the meantime, a portion, such as the on-load tap changer, is partitioned from the internal space of the outer casing by the shielding wall.