Partial Discharge Detection in Square-Wave Modulated Systems
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Solution Overview
Problem
Existing methods for detecting and processing partial electrical discharges in electrical apparatuses powered by sinusoidal alternating voltage fail when the voltage is modulated into a square wave, as they cannot derive the phase parameter, thereby limiting diagnostic effectiveness.
Innovation Solution
A device and method that include a synchronization module to extract the modulating wave from the power supply voltage and associate phase parameter values with detected pulses, enabling the construction of PRPD patterns even in apparatuses powered by square-wave modulated voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrical apparatus is powered by a square-wave modulated voltage, then the apparatus can operate with pulsed voltage, but the phase parameter cannot be derived from the voltage reading
Solution Approach 1:
The patent introduces a synchronization signal as an intermediary that carries timing information about the square-wave modulated voltage. This synchronization signal serves as a mediator between the power supply system and the detection system, enabling the processing unit to determine phase parameters without directly reading the modulated voltage waveform.
Solution Approach 2:
The patent replaces the traditional method of deriving phase information from voltage waveform analysis with a signal processing approach. Instead of mechanically analyzing the modulated voltage to extract phase information, the system uses digital signal processing of the synchronization signal to determine phase parameters, substituting direct voltage measurement with indirect signal processing.
2Productivity
If the voltage waveform is modulated into a square wave, then the power delivery is efficient, but the PRPD pattern construction becomes impossible
Solution Approach 1:
The patent applies preliminary action by extracting the synchronization signal in advance from the modulated voltage waveform before the actual partial discharge detection occurs. This synchronization signal is stored and used later to determine phase parameters, allowing the system to maintain power delivery efficiency while preserving the information needed for PRPD pattern construction.
Solution Approach 2:
The synchronization signal acts as an intermediary that preserves timing and phase information that would otherwise be lost in the square-wave modulated voltage. This mediator carries the essential temporal information needed to construct PRPD patterns without requiring direct analysis of the modulated power waveform.
3Device complexity
If direct voltage reading is used to derive phase parameter, then the system is simple, but it fails with modulated square-wave voltage
Solution Approach 1:
The patent introduces a synchronization signal as an intermediary between the power supply and detection systems. This mediator provides reliable phase information without requiring complex analysis of the modulated voltage waveform, maintaining system simplicity while improving reliability for modulated square-wave operation.
Solution Approach 2:
The patent segments the voltage information into two separate components: the modulated power waveform for energy delivery and the synchronization signal for timing information. This segmentation allows each component to serve its specific function independently, with the synchronization signal providing reliable phase information without being affected by the modulation of the power waveform.
Data Source
AI summary
A device (1) for detecting and processing signals relating to partial electrical discharges in an electrical apparatus (2) powered by a square-wave (3) voltage modulated by a modulating wave (4) in such a way as to form an alternating voltage of predetermined frequency, comprises: a sensor (5) connectable to the apparatus (2) for detecting a discharge signal (6) representing the electrical pulses generated by the partial discharges; a processing unit (7) connected to the sensor (5) to receive the discharge signal (6) and derive the detection instants of each of the pulses detected with respect to a predetermined time reference, a synchronization module (8) designed to receive an electrical signal (9) representing the power supply voltage and equipped with a filter (10) configured for extracting from said power supply signal (9) a signal (11) representing the modulating wave (4), the processing unit (7) being configured for associating with the pulses detected the values of a phase parameter (f) representing the phase of the modulating wave (4) at the pulse detection instants.