A Dual-Slot Barrier Sensor for Partial Discharge Detection in Gas-Insulated Equipment

Zachariades, Christos; Shuttleworth, R.; Giussani, Riccardo

doi:10.1109/jsen.2019.2943625

Cited by 36 publications

(19 citation statements)

References 17 publications

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“…Areva ultra-high frequency (UHF) partial discharge (PD) couplers with a bandwidth of 200-1500 MHz were builtin the GIB demonstrator for measuring PD activities. Two additional UHF sensors with a bandwidth of 300-2000 MHz were attached on the external enclosure of the GIB insulators [19]. The positions of the built-in and the barrier UHF sensors are shown in Fig.…”

Section: Full-scale Demonstrator For Withstand Type Testsmentioning

confidence: 99%

Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages

Loizou

Chen

Liu

et al. 2020

IEEE Trans. Power Delivery

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Sulphur hexafluoride (SF6), the most popular dielectric medium adopted in compressed gas insulated equipment, has been identified as a highly potent greenhouse gas. This has led to increased interest in finding a more environmentally friendly replacement candidate. In this paper, the technical viability of C3F7CN/CO2 gas mixtures was assessed as a potential retro-fill solution for existing SF6-filled gas insulated lines (GIL) and busbars (GIB). A reduced-scale coaxial prototype was developed to establish the breakdown strength of 20% C3F7CN / 80% CO2 and 16% C3F7CN / 84% CO2 gas mixtures in direct comparison with pure SF6 under the standard lightning impulse (1.2/50 μs). Breakdown results demonstrate that a mixture of 20% C3F7CN / 80% CO2 exhibits comparable insulation capability to pure SF6 in coaxial geometries with similar field uniformity to GIL / GIB. This initial finding has led to the construction of a full-scale GIB demonstrator rated for 420/550 kV. Type tests according to IEC 62271-204 showed that the 20% C3F7CN / 80 % CO2 gas mixture has passed all the required voltage levels as SF6. The research findings in this paper are an encouraging step towards a technically viable SF6-free retro-fill solution for existing GIL / GIB installed for the 400 kV transmission network in the UK.

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Section: Full-scale Demonstrator For Withstand Type Testsmentioning

confidence: 99%

Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages

Loizou

Chen

Liu

et al. 2020

IEEE Trans. Power Delivery

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“…Equations (3) and (4) are used to solve EM wave propagation in the volume (R 3 ) of the GIS model. Equation (5) shows that no EM waves are propagating after the PEC boundaries (R 2 ), but rather, they get reflected. Equation 6is used to calculate the intensity of EM waves received by each port along the boundary (R 2 ).…”

Section: Model Overviewmentioning

confidence: 99%

“…Different techniques have been deployed to improve the detection and localization of PD in GIS enclosures. Among these, ultra-high frequency (UHF) techniques have been in use since the 1980s as they showed great suppression to noise and high sensitivity [3]- [5]. UHF detection techniques have been widely used for PD detection, classification, and localization of different PD defects in different high voltage equipment [6], [7].…”

Section: Introductionmentioning

confidence: 99%

PD Signal Propagation in GIS: Ultra-High Frequency Detection-Based Modeling

et al. 2020

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Gas-insulated switchgears (GIS) have become essential parts of electrical power substations due to the associated merits of these capital assets. Although such resilient devices can rarely suffer from failure, partial discharge (PD) is responsible for around 85% of their recorded collapses. Ultra-high frequency (UHF) techniques have been widely used in the detection and localization of PD for a long time because of their immunity to noise and high sensitivity. Understanding electromagnetic (EM) wave behavior in GIS systems is significant for improving the utilization of UHF sensors in PD detection and for the optimal allocation of UHF antennas inside GIS systems. Thus, this paper is devoted to building a detailed 3D finite element (FE) model based on UHF detection techniques to understand the propagation behavior of EM waves inside GIS. A disk-type UHF sensor is used for acquiring EM waves inside the GIS. The sensitivity of the sensor has been obtained using a gigahertz transverse-electromagnetic (GTEM) test cell. The proposed model investigates the impact of multiple disconnecting parts including L-structure, relative angle between PD source and sensors, and disconnecting switches on the propagation of electromagnetic waves based on step 1 of the CIGRE recommendations. To validate the modeled GIS, a simple L-structured model is initially built, and a comparative analysis has been conducted between the built model and the experimental and analytical results from the literature.

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“…However, another factor is the design of the UHF sensor itself. Several UHF sensor designs with various strengths have been developed for use in transformers and gas-insulated switchgear (GIS) [ 11 , 12 , 13 , 14 ]. In this contribution, two popular sensor designs, which are commercially available, are studied.…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

Beura

Beltle

Tenbohlen

2020

Sensors

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Ultra-high frequency (UHF) partial discharge (PD) measurements in power transformers are becoming popular because of the advantages of the method. Therefore, it is necessary to improve the basic understanding of the propagation of signals inside the transformer tank and the factors that influence the sensitivity of the measurement. Since the winding represents a major obstacle to the propagation of the UHF signals, it is necessary to study the effect of winding design on signal propagation. Previous research activities have studied these effects using simplified models, and it is essential to consider the complexity of propagation in a complete transformer tank. Additionally, the quality of UHF PD measurements depends, to a large extent, on the sensitivity of the UHF sensors. In this contribution, a simulation model consisting of a simple, grounded enclosure with multiple winding designs is used to study the propagation characteristics of UHF signals when an artificial PD source is placed inside the winding. After analysis of the results, the winding designs are incorporated in an existing and validated simulation model of a 420 kV power transformer and analyzed to observe the influence in a more complex structure. Two commonly used sensor designs are also used in the simulation model to receive the signals. In all cases, the propagation and signal characteristics are analyzed and compared to determine the influence of the winding and sensor design on the UHF signals. It is found that the level of detail of winding design has a significant impact on the propagation characteristics. However, the attenuation characteristics of the UHF signals received by the two sensor designs are similar, with the electric field distribution around the sensor being the key difference.

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A Dual-Slot Barrier Sensor for Partial Discharge Detection in Gas-Insulated Equipment

Cited by 36 publications

References 17 publications

Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages

Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages

PD Signal Propagation in GIS: Ultra-High Frequency Detection-Based Modeling

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

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A Dual-Slot Barrier Sensor for Partial Discharge Detection in Gas-Insulated Equipment

Cited by 36 publications

References 17 publications

Technical Viability of Retro-Filling C3F7CN/CO2 Gas Mixtures in SF6-Designed Gas Insulated Lines and Busbars at Transmission Voltages

Technical Viability of Retro-Filling C3F7CN/CO2 Gas Mixtures in SF6-Designed Gas Insulated Lines and Busbars at Transmission Voltages

PD Signal Propagation in GIS: Ultra-High Frequency Detection-Based Modeling

Study of the Influence of Winding and Sensor Design on Ultra-High Frequency Partial Discharge Signals in Power Transformers

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Product

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Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages

Technical Viability of Retro-Filling C₃F₇CN/CO₂ Gas Mixtures in SF₆-Designed Gas Insulated Lines and Busbars at Transmission Voltages