Tag Archives: Current

The Dangers of Stray Current Damage in Electrical Systems & Arc Flash Protection

Published by Jim Galloway, International Association of Electrical Inspectors (IAEI) Magazine, Electrical Fundamentals – The Dangers of Stray Current Damage in Electrical Systems & Arc Flash Protection, July 3, 2019 The new extension to the factory is finally finished. The engineers have produced a state-of-the-art design; the qualified electricians have completed a professional installation withContinue reading “The Dangers of Stray Current Damage in Electrical Systems & Arc Flash Protection”

Current-Carrying Capacity Parallel Single-Core LV Cable

Published by Lech BOROWIK1, Artur CYWIŃSKI2Politechnika Częstochowska, Wydział Elektryczny (1), Pracownia Projektowa omega-projekt (2) Abstract. The paper presents the problems related to the selection of parallel single-core low voltage cables in terms of their current carrying capacity and accordance with PN-IEC 60364-5-523 national standard, exemplified by electric power transmission from transformer MV/LV 1600kVA, with proximityContinue reading “Current-Carrying Capacity Parallel Single-Core LV Cable”

Thermal Problems in HTS Transformer due to Inrush Current

Published by Grzegorz KOMARZYNIEC1, Tadeusz JANOWSKI2, Grzegorz WOJTASIEWICZ2, Michał MAJKA2, Politechnika Lubelska, Instytut Podstaw Elektrotechniki i Elektrotechnologii (1), Instytut Elektrotechniki w Warszawie (2) Abstract. With switching on a superconducting transformer to the energetic network, a unidirectional current of high amplitude may appear. Maximal values of the current impulses following shortly one after the other mayContinue reading “Thermal Problems in HTS Transformer due to Inrush Current”

How to Select the Right Current Transformer for Your Application

Published by Accuenergy, November 4, 2021. Help me choose the Right CT If you have a power measurement project coming up, chances are you have narrowed down your search for a power meter to a few choices. Whether it’s a multi-circuit application or a high-precision metering in an industrial setting, the next step in project preparationContinue reading “How to Select the Right Current Transformer for Your Application”

Wire Wrapping for Low Current Monitoring

Published by Veris Industries, Veris Application Note VN35 – Wire Wrapping for Low Current Monitoring. The information provided herein is intended to supplement the knowledge required of an electrician trained in high voltage installations. There is no intent to foresee all possible variables in individual situations, nor to provide all training needed to perform theseContinue reading “Wire Wrapping for Low Current Monitoring”

Why do 3rd harmonic currents overload neutral conductors?

Published by Mirus International Inc., [2010-01-08] MIRUS-FAQ001-B2, FAQ’s Harmonic Mitigating Transformers, 31 Sun Pac Blvd., Brampton, Ontario, Canada. L6S 5P6. Figure 7-1 shows how the sinusoidal currents on the phases of a 3-phase, 4-wire system with linear loads sum to return on the neutral conductor. The 120° phase shift between the sinusoidal load currents causesContinue reading “Why do 3rd harmonic currents overload neutral conductors?”

What is Contact Resistance Test and Why is Contact Resistance Testing Done

Published by Carelabs (Carelabz), Website: carelabz.com What is Contact Resistance Contact resistance is the resistance to current flow, due to surface conditions and other causes, when contacts are touching one another (in the closed condition of the device). This can occur between contacts of:  Breakers  Contactors  Relays  Switches  Connectors  Other switching devices  Contact resistance testing alsoContinue reading “What is Contact Resistance Test and Why is Contact Resistance Testing Done”

Learn About Residual Current Device Testing and Safety

Published by Carelabs (Carelabz), Website: carelabz.com Residual Current Device offer a level of personal protection that ordinary fuses and circuit-breakers cannot provide. Residual Current Devices, or RCDs. are safety switches that prevent people from getting electrocuted in homes and businesses. The device monitors the flow of electricity as it enters a property from the main distribution panel. A surge ofContinue reading “Learn About Residual Current Device Testing and Safety”

FLEX-CORE® Glossary of Terms

Published by FLEX-CORE®, Div. Morlan & Associates, Inc. Current Transformers Usually rated on a basis of 5 amperes secondary current and used to reduce primary current to usable levels for transformer-rated meters or transducers and to insulate and isolate them from high voltage circuits. Current Transformer Ratio Ratio of primary to secondary current. For aContinue reading “FLEX-CORE® Glossary of Terms”