Published by Dranetz Technologies, Inc. Website: Dranetz.com PU (Per Unit) Explained PU stands for Per Unit. It is a term that electric utility engineers frequently use, and it was incorporated into IEEE 1159. PU is the percentage formed by dividing the actual voltage by the nominal. For example, a sag to 0.8 pu on a 480V circuitContinue reading “PQ Terms & Definitions”
Tag Archives: Sag/Swell
Practical 400 Hz use Cases for Aviation Teams
Published by Dranetz Technologies, Inc. Below are three situations aviation teams often face, and how the HDPQ Xplorer 400 helps resolve them. Jetway keeps resetting when an aircraft connects What’s happening: During bridge movement or aircraft power-up, the 400 Hz supply dips. Sometimes it is a brief sag, other times a fast transient that trips protection.Continue reading “Practical 400 Hz use Cases for Aviation Teams”
UNIPOWER IEC 61000-4-30 Ed. 4
Published by Mr. Jonny Carlsson, Research Manager, Unipower AB, Sweden. Email: jonny.carlsson@unipower.se . Website: unipower.se Source URL: https://pqsynergy.com/assets/files/UNIPOWER-IEC61000-4-30Ed.4InprogressstateFDISMemberofWG9.pdf
Increasing Transmission Potential of 110 kV Alternating Current Lines
Published by Jacek KOZYRA, Zbigniew ŁUKASIK, Aldona KUŚMIŃSKA-FIJAŁKOWSKA, Kazimierz Pulaski University of Technology and Humanities in Radom, Faculty of Transport, Electrical Engineering and Computer Science. ORCID: 1. 0000-0002-6660-6713, 2. 0000-0002-7403-8760, 3. 0000-0002-9466-1031 Abstract. Construction of new power lines is a complicated and long-lasting formal and legal process. The duration of the investments is extended byContinue reading “Increasing Transmission Potential of 110 kV Alternating Current Lines”
Planning and Performing a Power Quality Survey
Published by Dranetz Technologies, Support – Technical Documents, Application Note, website: dranetz.com, 800-372-6832 (U.S & Canada) +1-732-287-3680 (International). INTRODUCTION The power quality survey is the first, and perhaps most important, step in identifying and solving power problems. Power problems can harm equipment performance and reduce reliability, lower productivity and profitability, and even pose personnel safetyContinue reading “Planning and Performing a Power Quality Survey”
Unipower – About Power Quality
Published by Unipower AB, Metallgatan 4C, 44132 Alingsås, Sweden. Email: info@unipower.se Power quality is a generic term for disturbance-free electricity supply. Deviation from voltage sinusoidal waveform (50 Hz), which may result in equipment being disturbed or damaged, is to be regarded as a power quality disturbance. This means that the more sensitive equipment you connect toContinue reading “Unipower – About Power Quality”
UPS Problem at Datacentre
Published by Unipower AB, Case Study: UPS Problem at Datacentre, Date: January 29th, 2017. Email: info@unipower.se Summary A software development company builds a new datacentre and experience problems with the UPS units and a hard drive failure. A monitoring system, PQ Secure from Unipower AB, was installed and it could be determined that the UPS units,Continue reading “UPS Problem at Datacentre”
Container Harbour in Gothenburg
Published by Jonny Carlsson, Unipower AB, Case Study: Container Harbour in Gothenburg, Date: November 8th, 2010. http://www.unipower.se The most important problem was the sags that were caused by the container cranes. The cranes created a lot of high reactive power during the start of the lift procedure. The high currents caused high demand on the transformerContinue reading “Container Harbour in Gothenburg”
Power Quality Blog 