Insulated Wire Partial Discharge Measurement via Dynamic Scanning
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Solution Overview
Problem
Existing methods for measuring partial discharge inception voltage (PDIV) in insulated wires are inadequate as they only provide a guaranteed value for the measured portion, not the entire length, due to varying insulating layer thickness, which can lead to premature partial discharge events when a voltage close to the measured value is applied.
Innovation Solution
A method and device that move the insulated wire while applying a test voltage and detecting partial discharge signals over its entire length, using a moving unit, an electrode, and a detection unit to determine the frequency of occurrence of partial discharge events, ensuring a guaranteed value for the entire wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If part of the insulated wire is extracted as a sample and PDIV is measured, then the measurement process is simple and quick, but the measured PDIV is not guaranteed for the entire length of the insulated wire
Solution Approach 1:
The patent applies the dynamics principle by moving the insulated wire through the measurement region rather than keeping it stationary. The wire is conveyed past the electrode and detection unit, allowing the measurement system to capture PDIV data from the entire wire length dynamically as it passes through the measurement zone, thus ensuring reliability for the complete wire while maintaining operational simplicity.
Solution Approach 2:
The patent transitions from a static measurement approach (measuring a fixed sample) to a dynamic spatial scanning approach. By moving the wire through the measurement region and scanning different positions along the wire length, the system adds a spatial dimension to the measurement, ensuring comprehensive coverage of the entire wire length without complicating the measurement process.
2Measurement precision
If a high value measured in the thick portion is regarded as PDIV of the entire insulated wire, then the measurement reflects the thickest portion, but a partial discharge event may occur in a thinner portion when voltage close to the PDIV is applied
Solution Approach 1:
The patent applies local quality by measuring the insulating layer thickness and PDIV characteristics at multiple specific locations along the wire length. The system identifies the thinnest portion and uses its PDIV value as the critical parameter for the entire wire, ensuring that the measurement accurately reflects the most vulnerable section rather than averaging or favoring thicker portions.
Solution Approach 2:
The patent performs preliminary measurement of the insulating layer thickness at multiple positions before finalizing the PDIV determination. By pre-identifying the thinnest portion and its corresponding PDIV value, the system ensures that the critical PDIV parameter is established in advance, preventing partial discharge events in thinner portions when voltage is applied.
3Adaptability or versatility
If the insulating layer thickness varies along the length of the insulating layer, then the wire can accommodate different design requirements, but the PDIV value changes along the wire length
Solution Approach 1:
The patent measures and records the insulating layer thickness at multiple positions along the wire length to identify the thinnest portion. By focusing on the local minimum thickness and its corresponding PDIV value, the system accounts for thickness variations while providing a consistent, conservative PDIV value that ensures safety across the entire wire length.
Solution Approach 2:
The patent changes the measurement approach by dynamically adjusting the measurement process to scan different positions along the wire length. The system varies the spatial position of the electrode and detection unit relative to the moving wire, capturing PDIV data at multiple locations to accurately reflect the impact of thickness variations on the overall PDIV characteristic.
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 allows for accurate measurement of partial discharge events over the entire length of the insulated wire, ensuring that a voltage lower than the minimum PDIV is applied to prevent breakdowns, thereby ensuring the reliability of the measurement.
Implementation Method 1
the application of a high voltage to the conductor generates an electric field around the insulating layer, and an increase in the electric field strength causes a partial discharge event from the insulating layer
Implementation Method 2
an increase in the electric field strength causes a partial discharge event from the insulating layer
Implementation Method 3
the occurrence or nonoccurrence of a partial discharge event due to the application of voltage is measured by using an optical sensor (generally, a photomultiplier, an electromagnetic-wave sensor, or the like)
Data Source
AI summary
A partial discharge measurement method includes: a moving step of moving an insulated wire including an insulating layer on a surface of the insulated wire; a voltage applying step of bringing an electrode which is connected to a power supply into contact with the insulating layer of the insulated wire which is moving, and applying a predetermined test voltage to the insulating layer while moving the insulated wire; a detection step of detecting, as a partial discharge signal, a signal which is more than or equal to a threshold value among signals involved in partial discharge events occurring from the insulating layer due to application of the predetermined test voltage; and a determination step of determining, based on a result in the detection step, frequency of occurrence of partial discharge events at the predetermined test voltage.