Wyniki wyszukiwania dla: rip currents

• Rip currents in the southern Baltic Sea multi-bar nearshore zone

  Publikacja

  • J. Schönhofer
  • A. Dudkowska

  - CONTINENTAL SHELF RESEARCH - Rok 2021

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• Rip currents in the non-tidal surf zone with sandbars: numerical analysis versus field measurements

  Publikacja

  • A. Dudkowska
  • A. Boruń
  • J. Malicki
  • J. Schönhofer
  • G. Gic-Grusza

  - OCEANOLOGIA - Rok 2020

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• AIP Conference Proceedings

  Czasopisma

  ISSN: 0094-243X , eISSN: 1551-7616

• Behavior of residual current devices at earth fault currents with DC component

  Publikacja

  • S. Czapp
  • H. Tariq
  • S. Cieślik

  - SENSORS - Rok 2022

  Low-voltage electrical installations are increasingly saturated with power electronic converters. Due to very high popularity of photovoltaic (PV) installations and the spread of electric vehicles (EV) as well as their charging installations, DC–AC and AC–DC converters are often found in power systems. The transformerless coupling of AC and DC systems via power electronic converters means that an electrical installation containing...

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• Improving sensitivity of residual current transformers to high frequency earth fault currents

  Publikacja

  • S. Czapp
  • K. Dobrzyński
  • J. Klucznik
  • Z. Lubośny
  • R. Kowalak

  - Archives of Electrical Engineering - Rok 2017

  For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when high frequency earth fault current occurs. Serious hazard of electrocution exists then. In order to detect such a current, it is necessary to modify parameters of residual current devices, especially the operating point of their current transformer. The authors proposed...

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• Testing sensitivity of A-type residual current devices to earth fault currents with harmonics

  Publikacja

  • S. Czapp

  - SENSORS - Rok 2020

  In many applications, modern current-using equipment utilizes power electronic converters to control the consumed power and to adjust the motor speed. Such equipment is used both in industrial and domestic installations. A characteristic feature of the converters is producing distorted earth fault currents, which contain a wide spectrum of harmonics, including high-order harmonics. Nowadays, protection against electric shock in...

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• Mobility management solutions for current IP and future networks

  Publikacja

  • J. Woźniak

  - TELECOMMUNICATION SYSTEMS - Rok 2016

  Enormous progress in the design of portable electronic devices allowed them to reach a utility level comparable to desktop computers, while still retaining their mobility advantage. At the same time new multimedia services and applications are available for IP users. Unfortunately, the performance of base IP protocol is not satisfactory in mobile environments, due to lack of handover support and higher layer mobility management...

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• Modification of the operating point of residual current transformers for high frequency earth fault currents detection

  Publikacja

  • S. Czapp
  • K. Dobrzyński
  • J. Klucznik
  • Z. Lubośny
  • R. Kowalak

  - Rok 2016

  For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when earth fault current with high frequency components occurs. Serious hazard of electrocution exists then. One of the most important element of residual current devices is a residual current transformer with iron core. Tripping characteristic of residual current devices strictly...

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• Grade of service determination methodology in IP networks with SIP protocol

  Publikacja

  • S. Kaczmarek
  • M. Lipski

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2010

  Although Grade of Service is very important in VoIP providers evaluation, We wasn't able to find any paper regarding the topic of measuring GoS variables for IP networks utilizing SIP, which are defined like for PSTN/ISDN/GSM networks (post-selection delay, answering delay, release delay, or probability of end-to-end blocking). Due to the lack of research in this field, it was necessary to start from defining measures and cover...

• Effects of workpiece feeding errors on multi-rip saws

  Publikacja

  • R. Wasielewski
  • K. Orłowski

  - Annals of Warsaw University of Life Sciences-SGGW Land Reclamation - Rok 2009

  W pracy przedstawiono przyczyny i efekty błędów prowadzenia materiału na wielopiłach tarczowych. Ich znajomość umożliwia szybką diagnostykę przyczyn, a także skuteczną minimalizację błędów prowadzenia materiału.