Year 2020

• Fault Loop Impedance Measurement in Circuits Fed by UPS and Principle of Safety Protection

  Publication

  • J. Katarzyński
  • M. Olesz

  - Sustainability - Year 2020

  This paper indicates a significant problem of uncertainty of fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value of this impedance, related to the short-circuit current disconnection time and to the reference value, is one of the most important elements that determines the approval of an electrical installation and its receivers...

  Full text available to download

• Transient States during Short-circuit in a Line Powered by UPS and its Impact on Earth Fault Loop Impedance Measurement and Power Quality

  Publication

  • J. Katarzyński
  • M. Olesz

  - Year 2020

  The short-circuit in a line powered by Uninterruptible Power Supply (UPS) during different UPS operation modes is presented in the article. The transient state condition related to the short-circuit in a line fed from double conversion On-line UPS is discussed in detail. The results of the measurements of earth fault loop impedance (FLI) in circuits powered by UPS with the instruments of various manufacturers are presented. The...

  Full text to download in external service