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Partial Discharge (PD) is one of symptom that occur due to defect on the high voltage insulation system. PD measurement is needed to monitor the condition of equipment and avoid the failure. This paper deals with PD measurement by using Transient Earth Voltage (TEV) sensor. Applying a given voltage around 2 to 6 kV to artificial defects placed in a metal box produces PD. PD occurring inside the metal...
This study deals with advancement of insulation diagnosis technology by partial discharge (PD) detection with transient earth voltage (TEV) signal in high voltage equipment such as oil-filled transformer. TEV detection method allows to detect signals by attaching TEV sensors to the outer wall of the existing facilities. Experiment and analysis of TEV signal propagation using finite-difference time-domain...
This paper deals with dielectric properties of olefin-based thermosetting resin to understand the applicability to electrical insulating materials. Dielectric properties such as dielectric constant, dielectric loss, volume resistivity, and dielectric strength of poly-dicyclopentadiene are evaluated as well as other properties such as moisture absorption, viscosity, and glass transition temperature...
Partial discharges of small-air-gap for the molded insulation system has been investigated in view of the Paschen curve. It was found that Vs (partial discharge inception voltage: PDIV) in a smaller Pd (pressure times gap distance) region than so-called Paschen??s minimum was determined in terms of glow-like discharge with micro-second order of discharge-current probably due to the ionic current for...
Partial discharge detection in UHF band is more effective because it detects electromagnetic wave with high S/N ratio. We used external sensor on GIS tank in order to detect partial discharge signals. External sensor is used to detect leaked EM wave signals from insulation spacer of GIS tank. In this paper, we conduct experiment in 66 kV GIS model with metal type (MT) spacer and leaked EM wave will...
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