Partial Discharge Coupling Device Phase Alignment
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Solution Overview
Problem
Partial discharge analyzers face difficulties in accurately analyzing pulse signals due to reference signals not being in phase with the pulse signals, which hinders the determination of insulation degradation in generator stator windings.
Innovation Solution
A partial discharge analysis coupling device comprising a connector connecting two coupling capacitors, conductive rods for high voltage and ground connections, a current transformer generating a pulse signal, and a reference signal generator adjacent to the current transformer, ensuring the pulse and reference signals are in phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference signal is received from another device connected to the partial discharge analyzer, then the reference signal is available for analysis, but the reference signal is not in phase with the pulse signal making accurate analysis difficult
Solution Approach 1:
The patent combines the reference signal generator with the coupling device, integrating both pulse signal and reference signal generation into a single unit. This ensures the signals are in phase by design, eliminating the phase alignment problem that occurs when using separate external devices.
Solution Approach 2:
The coupling device acts as an intermediary between the high voltage source and the partial discharge analyzer, generating both signals locally and ensuring their phase coherence through the shared coupling capacitors and circuit architecture.
2Ease of operation
If a coupling device is used to connect the generator stator windings to the partial discharge analyzer, then the pulse signal can be generated and transmitted, but the reference signal from external devices is not in phase with the pulse signal
Solution Approach 1:
The coupling device integrates both pulse signal and reference signal generation functions into a single unit, eliminating the need for separate external reference signal devices and ensuring phase coherence through shared circuitry.
Solution Approach 2:
The coupling device performs multiple functions: it couples the high voltage signal to the analyzer, generates the pulse signal, and simultaneously generates a phase-aligned reference signal, making it a multi-functional instrument.
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 accurate determination of insulation degradation in generator stator windings by ensuring the pulse and reference signals are in phase, allowing for precise analysis.
Implementation Method 1
a current transformer substantially surrounding a portion of the second conductive rod, the current transformer configured to generate a pulse signal
Implementation Method 2
a connector electrically connecting a first coupling capacitor and a second coupling capacitor
Data Source
AI summary
A partial discharge analysis (PDA) coupling device is provided. In one embodiment, a device includes: a connector electrically connecting a first coupling capacitor and a second coupling capacitor; a first conductive rod for electrically connecting the first coupling capacitor to a high voltage input; a second conductive rod for electrically connecting the second coupling capacitor to ground; a current transformer substantially surrounding a portion of the second conductive rod, the current transformer configured to generate a pulse signal; and a reference signal generator adjacent to the current transformer configured to generate a reference signal in phase with the pulse signal.