Industrial Research And Consultancy Centre
Method and partial discharge measurement system for examining partial discharge characteristics of object
Abstract

The Universal Hardware PD Simulator addresses the critical issue of insulation breakdown in high voltage equipment, a concern in the power system industry. Partial Discharges (PD) precede such breakdowns, indicating insulation deterioration. Existing methods for studying PD require costly high voltage labs and complex equipment, posing barriers to new researchers. This simulator bridges this gap by generating PD pulses using physics-based models, enabling calibration and testing of detection equipment. It employs a user-friendly interface to configure test parameters and utilizes advanced hardware for high-fidelity pulse generation. This innovation supports research, enhances calibration accuracy, and aids in predicting insulation health, ensuring reliable operation of electrical systems.

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Method and partial discharge measurement system for examining partial discharge characteristics of object
Method and partial discharge measurement system for examining partial discharge characteristics of object
Societal Impact
  • Facilitates safer and more reliable operation of high voltage equipment, reducing unexpected failures and enhancing overall system reliability.
  • Promotes cost-efficiency in power system maintenance and operations through improved diagnostic capabilities. 
  • Enhances safety standards in high voltage laboratories by minimizing risks associated with experimental procedures. 
  • Contributes to environmental conservation efforts by optimizing energy consumption and reducing waste associated with equipment failures.
Salient technical features and Advantages of the Technology
  • High Resolution Fast Settling DAC Based Implementation: Ensures generation of precise analog pulses with microsecond-level time resolution, critical for accurate calibration and testing of PD detection equipment. 
  • Physics-Based Formulations for Pulse Generation: Derives pulse characteristics from theoretical models, enhancing simulation accuracy and supporting advanced research in insulation health diagnostics. 
  • Flexible Hardware and Software Schemes: Allows seamless adaptation to evolving PD detection methodologies and future research insights, ensuring long-term usability and relevance. 
  • Analog Electronics-Based Pulse Generation System: Capable of producing pulses with variable magnitudes and customizable rise and fall times, providing versatility in testing and calibration scenarios. 
  • Scalable Graphical User Interface (GUI): Supports intuitive configuration of test parameters for different dielectric materials, defect types, and electrode configurations, facilitating easy experimentation and data collection. 
  • Integration of Stochastic PD Pulse Characteristics: Incorporates randomness in pulse intervals, replicating real-world PD conditions accurately for robust testing and validation purposes. 
  • Enhanced Pulse Resolution and Signal Fidelity: Delivers high fidelity output through a 16-bit DAC and advanced analog circuitry, ensuring reliable and precise pulse generation for critical PD detection applications.
Current Status of Technology
  • The Universal Partial Discharge Emulator has been designed, developed, constructed and validated. It comprises of a Partial Discharge (PD) physics-based software simulation and hardware pulse generation circuit to produce desired analog pulses based on the PD Attributes. 
  • LabVIEW software-based HMI and physics backed algorithm, which generates the PD characteristics as seen in various stages of ageing using formulations based on Pedersons induced charge theory. The model also incorporates the stochastic nature of the PD pulses. 
  • The specially designed analog precision pulse generator can generate narrow pulses (i.e. with rise times as low as ∼ 4 ns and amplitudes with 16-bit accuracy) with PD pulse attributes generated by the software physics backed algorithm. These pulses which replicate the actual PD can be displayed on an oscilloscope for training and research purposes. 
  • The calibration system for PD measuring instruments using a PD emulator has also been designed and simulated. 
  • The results of the PD Simulator match well with those experimentally reported in literature. The hardware analog electronic circuit has been constructed and validated to generate bipolar pulses with rise times as low as ∼30 ns and amplitude in range of few μV to hundreds of mV with 16-bit accuracy. The designed system can reproduce amplitudes changes with an accuracy of ± 1 LSB. The time interval between pulses that can be generated using this circuit ranges from 10 μs to 1 s with as low as 0.8% error in most of the range of operation. An enhanced scheme was designed, developed and simulated to generate fast rising pulses with facility of digitally adjustable rise time, and digitally adjustable pulse width. This scheme was implemented in Multisim and the pulse shapes were observed on the oscilloscope in the simulation. The minimum rise time of 3.85 ns, has been achieved with this enhanced design. This research grade emulator system designed and constructed is flexible and scalable. 
  • The developed software can be used to generate knowledge for non-standard cases which are usually difficult to experiment with. It may be worth noting that, the physical processes (field calculations, electron generation, determination of number of charged particles, and probability of PD occurrence) in the PD mechanism have been incorporated in the software. Hence, there is a high probability that a new case also can get correctly diagnosed. 
  • In the case of surface phenomena, weights are adjusted suitably to calculate the amount of surface charges so as to reproduce the observed PRPD patterns and the rise time values. 
  • The versatility of the designed system is verified by simulating three different cases in which PD could occur. 
  • The designed hardware analog pulse generation system is also flexible such that any advances in the mathematical formulation can be adopted by the system to generate the PD pulses and its attributes satisfying the new phenomenon. The specifications required to replicate the PDs as seen in the field was compared with the designed hardware analog pulse generation system and found to be satisfactory. 
  • The PD pulses observed at the various stages of ageing in the insulation of the equipment, from the time of putting in service to above 100 hours of service-can be studied by the researchers using this PD Emulator. 
  • The LabVIEW tool developed for prediction of stage of ageing of the insulation confirms that using the PRPD patterns along with the time resolved data and its statistics from frequency, time-frequency and time domain analysis can be used efficiently for classification of the PD as per ageing.
Relevant Industries

Power Systems, Energy Sector, Calibration and Testing

Applications or Domain

Power Systems, Energy Infrastructure, High Voltage Laboratories, PD Detection, Calibration and Testing

**This IP is jointly owned**