Wyniki wyszukiwania dla: coastal currents

• Surf Zone Currents in the Coastal Zone of the Southern Baltic Sea – a Modelling Approach

  Publikacja

  • A. Dudkowska
  • A. Cupiał

  - Rok 2022

  Nearshore currents in a multi-bar non-tidal coastal zone environment located in the Southern Baltic Sea are studied. Spatiotemporal seaward-directed jets – so-called rip currents – are an important part of the nearshore current system. In previous research, Dudkowska et al. (2020) performed an extended modelling experiment to determine the wave conditions that are conducive to the emergence of rip currents. In this paper, the...

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• COASTAL ENGINEERING

  Czasopisma

  ISSN: 0378-3839 , eISSN: 1872-7379

• 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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• COASTAL MANAGEMENT

  Czasopisma

  ISSN: 0892-0753 , eISSN: 1521-0421

• 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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• CRYSTAL GROWTH & DESIGN

  Czasopisma

  ISSN: 1528-7483 , eISSN: 1528-7505

• Estuarine Coastal and Shelf Science

  Czasopisma

  ISSN: 0272-7714 , eISSN: 1096-0015

• MEDIUM-TERM WAVE AND CURRENT MODELLING FOR A MESOTIDAL WADDEN SEA COAST

  Publikacja

  • A. Herman
  • R. Kaiser
  • H. Niemeyer

  - Rok 2007

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