High-voltage onsite commissioning tests for gas-insulated substations using uhf partial discharge detection

Bell, R. N.; Charlson, C.; Halliday, S.P.; Irwin, T.; Lopez-Roldan, J.; Nixon, J.

doi:10.1109/tpwrd.2002.803690

Cited by 23 publications

(6 citation statements)

References 1 publication

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“…PD signals are widely used in defect detection and on-site monitoring of GIS [16][17][18][19]. The primary purpose of the PD detection system in this paper was to capture the waveform of each PD signal with high temporal resolution and high sensitivity throughout the test to find out detailed information about the PD process.…”

Section: Daq System and Data Collection Methodsmentioning

confidence: 99%

Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator

Zhao

et al. 2020

Energies

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Conductive particles are one of the most important defects which can greatly degrade the performance of gas-insulated metal-enclosed switchgear (GIS). Many efforts have been made to clarify the influence on the withstand voltage, understand the flashover mechanism, and build a comprehensive model to describe the particle-initiated flashover. In this study, a partial discharge (PD) signal detected through a photomultiplier (PMT) and recorded by a high-speed data acquisition (DAQ) system was used to analyze the discharge development of a conductive particle-contaminated GIS insulator under constant high AC voltage. An additional PMT was used as a reference to eliminate the dark count of the PMT and the data collection method of a DAQ system was optimized to capture the pulse waveform of each PD to obtain detailed physical information. Spectra of the PD pulse amplitude over pulse width, PD counts within various amplitude ranges over time and phase resolved partial discharge (PRPD) patterns of the PDs in different stages are obtained through the captured PD waveforms. Characteristics of the PDs from the application of the high AC voltage up to the flashover of the insulator were then analyzed, and it was found that the features of the PDs in the near-flashover stage were significantly different to the previous stages.

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Section: Daq System and Data Collection Methodsmentioning

confidence: 99%

Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator

Zhao

et al. 2020

Energies

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“…This voltage is about 50% of power frequency withstand voltage (~680 kV) and may be inadequate to commission the equipment. Free-moving particles observed in service encounter low risks if their lengths are less than 3 mm [7].…”

Section: Description Of the Gitl Modelmentioning

confidence: 99%

Effect of Metallic Particles on E-field Enhancement in Extra High Voltage Gas-insulated Transmission Lines

Rao¹,

Satyanarayana²,

Kumar³

et al. 2010

Journal of Electrical Engineering and Technology

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-Gas-insulated transmission lines (GITL) are valued as technological solutions in hydropower stations due to their enormous power handling capabilities. The performance of GITL is a function of the size of metallic particles inside the gas-insulated chamber. Electrostatic field (E-field) enhancement is a common phenomenon in gas-insulated lines due to these metallic particles. In this study, the E-field enhancement factor is calculated by considering metallic particles at various locations in the gas-insulated line/bus section, such as high-tension (HT) conductor, high-voltage shields, support insulator, and inner surface of grounded enclosure. For this purpose, a two-dimensional model based on finite element (FE) method is developed. The length of the metallic particle is in the range of 1 to 10 mm while the diameter is between 1 to 3 mm. E-field enhancement is also computed for various particle configurations of the gas-insulated system, with focus on dielectric coating made of epoxy on HT conductor and inner surface of grounded enclosure.

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“…(5)(6)(7) Being one of the important performance characteristics of the GIS, the reliability of its insulation is of great importance to the safety of power systems. As insulation failure usually starts with PD activity, which is usually accompanied by secondary phenomena such as sound, light, electromagnetic waves, temperature changes, and chemical reactions, (8)(9)(10)(11) hidden internal dangers can be detected by monitoring PD so that the reliability of the equipment can be ensured.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Acoustic Emission Sensor Based on Polarization-maintaining and Absorption-reducing Polarization-maintaining Fiber

2018

Sensors and Materials

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Partial discharge (PD) usually occurs before the insulation failure of a gas-insulated switchgear (GIS). Early failures in GIS can be detected effectively by monitoring the vibration signal initiated by PD. In this paper, a new type of acoustic-emission (AE) sensor based on a polarization-maintaining and absorption-reducing (PANDA) polarization-maintaining fiber (PMF) is proposed to detect the PD-induced ultrasound information accurately in GIS. Pressure load affects the birefringence of the PMF, leading to variation in light output intensity. Simulation and experimental results indicate that the effective refractive index difference between the x and y polarization modes has a linear relationship with the external pressure. Therefore, pressure variations generated by ultrasound can be obtained by interference demodulation between the x and y polarization modes. The proposed sensor has many advantages such as simple structure, small volume, and strong environmental tolerance. The results of this work provide a new direction for more effective PD detection methods and fault diagnosis approaches.

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High-voltage onsite commissioning tests for gas-insulated substations using uhf partial discharge detection

Cited by 23 publications

References 1 publication

Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator

Characteristics of the Partial Discharge in the Development of Conductive Particle-Initiated Flashover of a GIS Insulator

Effect of Metallic Particles on E-field Enhancement in Extra High Voltage Gas-insulated Transmission Lines

Highly Sensitive Acoustic Emission Sensor Based on Polarization-maintaining and Absorption-reducing Polarization-maintaining Fiber

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