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Wikkerink, D.P. (author), Gagic, Mladen (author), Mor, A. R. (author), Polinder, H. (author), Ross, Robert (author)A degaussing system can be used to reduce the detectability of the magnetic signature of a ship. Commonly, a degaussing system consists of a set of onboard copper coils that produce a magnetic field to compensate for the magnetic signature. High-temperature superconductive degaussing coils are considered an alternative to copper degaussing...journal article 2024
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Mier Escurra, C. (author), Mor, A. R. (author), Vaessen, P.T.M. (author)This paper introduces a directional coupler for partial discharge (PD) measurements in gas-insulated substations (GIS). The sensor comprises a combination of magnetic and electric couplers, effectively segregating forward and backward pulses to enhance PD charge estimation and defect location. The sensor's design was supported with finite...journal article 2024
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Mier Escurra, C. (author), Mor, A. R. (author), Luo, T. (author), Vaessen, P.T.M. (author)The correct identification of partial discharges (PDs) is instrumental for the maintenance plan in gas-insulated systems (GIS). However, onsite PD measurements are difficult, especially in HVDC systems, where partial discharges can be confused with interference. This paper proposes a method to discern PDs from interferences based on the GIS...journal article 2024
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Garnacho, Fernando (author), Álvarez, Fernando (author), Elg, Alf Peter (author), Mier Escurra, C. (author), Lahti, Kari (author), Khamlichi, Abderrahim (author), Arcones, Eduardo (author), Klüss, Joni (author), Mor, A. R. (author)On-site partial discharge (PD) measurements have turned out to be a very efficient technique for determining the insulation condition in high-voltage electrical grids (AIS, cable systems, GIS, HVDC converters, etc.); however, there is not any standardised procedure for determining the performances of PD measuring systems. In on-line and on...journal article 2023
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Mier Escurra, C. (author), Mor, A. R. (author), Vaessen, P.T.M. (author)Partial discharge (PD) measurements in gasinsulated substations (GIS) are tested according to the standard IEC 60270. This “conventional” PD test method applies to electrically small devices. The equipment size increases the resonance, and attenuation, contributing to the total uncertainty. Additionally, when an ultra-high frequency (UHF) sensor...conference paper 2023
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Vera, Carlos (author), Garnacho, Fernando (author), Klüss, Joni (author), Mier Escurra, C. (author), Álvarez, Fernando (author), Lahti, Kari (author), Khamlichi, Abderrahim (author), Elg, Alf Peter (author), Mor, A. R. (author)The insulation condition of HVDC grids consisting of cable systems, GIS, and converters should be monitored by partial discharge (PD) analysers using artificial intelligence (AI) tools for efficient insulation diagnosis. Although there are many experiences of PD monitoring solutions developed for the supervision of the insulation condition of...journal article 2023
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Mier Escurra, C. (author), Mor, A. R. (author), Vaessen, P.T.M. (author), Lathouwers, A.G.A. (author)One of the main difficulties in measuring partial discharges (PD) in gas-insulated substations (GIS) is the overlapping of pulses at the sensor's location, which distorts the pulse resolution and the charge estimation. This research presents a new method called “synergy,” which identifies and suppresses reflections using magnetic and electric...journal article 2023
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Wikkerink, D.P. (author), Mor, A. R. (author), Polinder, H. (author), Ross, Robert (author)Ships can avoid to be detected by magnetic mines by reducing their magnetic signature with degaussing coils. Degaussing currents are provided by switched mode power supplies which impose a current ripple on top of the degaussing current. The ripple might be visible in the magnetic signature which would increase the detectability of the ship. A...journal article 2022
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Wikkerink, D.P. (author), Mor, A. R. (author), Polinder, H. (author), Ross, Robert (author)Detection of the magnetic signature of ships can be avoided by using a degaussing system; a set of on-board copper coils that compensates for the magnetic signature. High temperature superconductors (HTS) are currently investigated as a replacement for copper degaussing coils. By using HTS, we have to deal with higher currents and therefore...journal article 2022
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Mier Escurra, C. (author), Mor, A. R. (author), Castro Heredia, L.C. (author), Vaessen, P.T.M. (author)There are no accepted procedures that quantify the apparent charge of partial discharge (PD) in gas-insulated substations (GIS). This paper proposes a calibration method for PD charge estimation using unconventional electromagnetic sensors: a magnetic loop antenna (inductive coupler) and an electric antenna (capacitive coupler.) The...journal article 2022
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Mier Escurra, C. (author), Mor, A. R. (author)Partial discharges (PD) measurements provide an estimation of the severity of the insulation degradation; additionally, it is used as a unit of standardization. Up to now, only the IEC 62478 briefly mentions partial discharge measurements using electromagnetic sensors in gas-insulated substations (GIS). The IEC60270 standard provides a method...conference paper 2022
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Mier Escurra, C. (author), Mor, A. R. (author)Recent research has found that Magnetic loop antennas can detect partial discharges (PD) in gas-insulated substations (GIS); however, unbalanced shielded loop (UBSL) antennas are affected by electric field coupling. This research proposes a balanced shielded loop (BSL) adapted for GIS PD sensing with different designs. The frequency response and...conference paper 2022
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Abdul Madhar, S. (author), Mor, A. R. (author), Mraz, Petr (author), Ross, Robert (author)This paper presents the investigation on surface discharge behavior of various dielectric samples under DC. It sequentially develops the knowledge base for the study and analysis of the partial discharge (PD) defect with the goal of PD defect identification under DC. In order to facilitate this, the material properties of the dielectric are...journal article 2021
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Mier Escurra, C. (author), Mor, A. R. (author), Vaessen, P.T.M. (author)A recent investigation explored a new measuring concept used in partial discharges (PD) measurements in gas insulated substations (GIS), consisting of a magnetic loop antenna. The sensor's frequency response was characterized up to some tens of MHz. This paper proposes an improved version of the sensor with an extended bandwidth (BW) one...journal article 2021
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Mor, A. R. (author), Muñoz Muñoz, F.A. (author), Castro Heredia, L.C. (author)The authors wish to make the following erratum to this paper [1]: the summation symbol in the Equations (11) and (12) should be a product symbol. The corrected Equations (11) and (12) appear below: The authors apologize for any inconvenience caused and state that the scientific conclusions are unaffected. The original article has been updated...journal article 2021
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Mier Escurra, G.A. (author), Mor, A. R. (author), Castro Heredia, L.C. (author), Vaessen, P.T.M. (author)Space charges are one of the main challenges facing the constantly increasing use of extruded high voltage direct current (HVDC) cables. The Pulsed Electro-Acoustic (PEA) method is one of the most common procedures for space charge measurements of insulation. One issue with the PEA method is distortion due to the crosstalk between the applied...journal article 2021
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Mier Escurra, C. (author), Mor, A. R. (author)Gas insulated substations (GIS) have increased in the electric power system in recent years and is expected to continue increasing in the following years. The GIS has remarkable advantages over air insulated substation in offshore windfarms where the installation space is limited. The outlying location of the GIS demands a robust monitoring...conference paper 2021
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Mier Escurra, G.A. (author), Mor, A. R. (author)The Pulsed Electroacoustic Method is one of the most common methods for space charge measurements in solid dielectrics. This method involves applying a voltage pulse across the dielectric under test, which modifies the electrostatic force balance across the dielectric, creating an acoustic signal that can be measured externally. This work...conference paper 2021
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Abdul Madhar, S. (author), Brunner, Marc (author), Mor, A. R. (author), Mraz, Petr (author)The discharge over dielectric interfaces popularly known as surface discharge is a very common defect type that is associated with its respective discharge pattern under AC voltages. However, the same designs behave differently under DC voltages leading up to erratic PD behavior. To understand the process of surface discharge an equivalent...conference paper 2021
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Abdul Madhar, S. (author), Mraz, Petr (author), Mor, A. R. (author), Ross, Robert (author)This paper presents several approaches to the analysis of partial discharge (PD) data. Three common defects namely corona, surface and floating electrode are studied with the goal of defect identification under DC stress conditions. One of the major concerns with DC-PD testing, is its non-repetitive/erratic pulse pattern. This paper, however,...journal article 2020