Antennas in Partial Discharge Sensing System

Robles, Guillermo Cortés; Vázquez, José Luis

doi:10.1007/978-981-4560-75-7_95-1

Cited by 13 publications

(11 citation statements)

References 76 publications

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“…This problem can be solved by installing several antennas, both on the side walls and on the top cover of transformer tank. b) c) a) ence, because it is the most commonly used for power transformer and GIS/GIL diagnostics [11,19]. The measured VSWR plot is shown in Figure 11.…”

Section: Discussionmentioning

confidence: 99%

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Sikorski¹,

Szymczak²,

Siodła³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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Science and Technology article citation info: IntroductionLarge power transformers are the most critical component in electric power systems, as they are essential in maintaining a reliable supply of electric energy. There are many factors which cause a transformer malfunction, but those, which can potentially lead to catastrophic failure are winding damages (due to short-circuit, lightning, and other over-voltages) and insulation system failure (moisture, thermal aging, partial discharges). The damage from a catastrophic transformer failure may run into tens of millions of dollars [16]. To avoid such a scenario, power utilities are moving towards continuous transformer condition monitoring, based on dissolved gas analysis and acoustic emission (AE) or electromagnetic (HF/VHF/UHF) partial discharge detection.According to the newest research results and analyses presented by the experts of the CIGRE Working Group A2.37, in the technical brochure 642: Transformer Reliability Survey, the main reason of breakdowns of high voltage power transformers is damage to the windings and the main insulation system [3]. Mechanical defects in the form of winding deformations (axial displacements and radial deformations) and deterioration of insulation properties associated with thermal aging processes [6], can lead to the initiation of the partial discharge (PD) phenomena occurrence.In recent years, in the electric power industry and research centres, a trend consisting in developing and implementing advanced

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Section: Discussionmentioning

confidence: 99%

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Sikorski¹,

Szymczak²,

Siodła³

et al. 2018

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…When a PD occurs, a non-periodically changing current pulse excites a changing magnetic field and radiates a high-frequency electromagnetic (EM) wave through the insulator. Due to the short-duration of the PD current pulse and the steep rising edge, the excitation frequency of the EM wave ranges from several MHz to several GHz [19,20].…”

Section: Uhf Methodsmentioning

confidence: 99%

Typical Internal Defects of Gas-Insulated Switchgear and Partial Discharge Characteristics

Zeng¹,

Tang²,

Zhang³

et al. 2018

Simulation and Modelling of Electrical Insulation Weaknesses in Electrical Equipment

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Gas-insulated switchgear (GIS) is a common electrical equipment, which uses sulfur hexafluoride (SF 6) as insulating medium instead of traditional air. It has good reliability and flexibility. However, GIS may have internal defects and partial discharge (PD) is then induced. PD will cause great harm to GIS and power system. Therefore, it is of great importance to study the intrinsic characteristics and detection of PD for online monitoring. In this chapter, typical internal defects of GIS and the PD characteristics are discussed. Several detection methods are also presented in this chapter including electromagnetic method, chemical method, and optical method.

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“…These non-invasive sensors are normally placed in the grounding conductors of the earthing network [ 15 , 22 ]. Furthermore, another approach for PD measuring or monitoring is based on the acquisition of signals in the UHF range by using different types of antennas [ 23 ]. These antennas can be classified as internal (invasive) or external (non-invasive) sensors, according to whether they are mounted inside or outside the HV equipment.…”

Section: Measuring Methods Sensors and Measurement Devicesmentioning

confidence: 99%

Diagnosis of Insulation Condition of MV Switchgears by Application of Different Partial Discharge Measuring Methods and Sensors

Gómez

Albarracín‐Sánchez

Vecino

et al. 2018

Sensors

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Partial discharges (PD) measurement provides valuable information for the condition assessment of the insulation status of high-voltage (HV) electrical installations. During the last three decades, several PD sensors and measuring techniques have been developed to perform accurate diagnostics when PD measurements are carried out on-site and on-line. For utilities, the most attractive characteristics of on-line measurements are that once the sensors are installed in the grid, the electrical service is uninterrupted and that electrical systems are tested in real operating conditions. In medium-voltage (MV) and HV installations, one of the critical points where an insulation defect can occur is inside metal-clad switchgears (including the cable terminals connected to them). Thus, this kind of equipment is increasingly being monitored to carry out proper maintenance based on their condition. This paper presents a study concerning the application of different electromagnetic measuring techniques (compliant with IEC 62478 and IEC 60270 standards), together with the use of suitable sensors, which enable the evaluation of the insulation condition mainly in MV switchgears. The main scope is to give a general overview about appropriate types of electromagnetic measuring methods and sensors to be applied, while considering the level of detail and accuracy in the diagnosis and the particular fail-save requirements of the electrical installations where the switchgears are located.

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Antennas in Partial Discharge Sensing System

Cited by 13 publications

References 76 publications

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers

Typical Internal Defects of Gas-Insulated Switchgear and Partial Discharge Characteristics

Diagnosis of Insulation Condition of MV Switchgears by Application of Different Partial Discharge Measuring Methods and Sensors

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