The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices

Published by Stanisław CZAPP , Gdańsk University of Technology, Faculty of Electrical and Control Engineering Abstract. In the paper spectral analysis of the distorted earth fault currents in circuits with variable speed drives is performed. Effectiveness of protection against electric shock using residual current devices in circuits with variable speed drives for various PWM frequenciesContinue reading “The Effect of PWM Frequency on the Effectiveness of Protection Against Electric Shock using Residual Current Devices”

Understanding Power Quality Concepts

Published by CEA Technologies Inc. (CEATI), POWER QUALITY Energy Efficiency Reference Guide, Chapter 2 – Understanding Power Quality Concepts. 2.1 The Electrical Distribution System One of the keys to understanding power quality is to understand how electrical power arrives at the socket, and why distribution is such a critical issue. Electrical power is derived fromContinue reading “Understanding Power Quality Concepts”

High Neutral-to-Ground Voltages

Published by Electrotek Concepts, Inc., PQSoft Case Study: PQ Investigation at a Battery Facility, Document ID: PQS0401, Date: March 30, 2004. Abstract: An office complex was experiencing continual operational problems with some of their electronic equipment not protected by power conditioning equipment. The equipment would periodically exhibit strange behavior. An infrared heat detector was used toContinue reading “High Neutral-to-Ground Voltages”

PQ Investigation at a Battery Facility

Published by Electrotek Concepts, Inc., PQSoft Case Study: PQ Investigation at a Battery Facility, Document ID: PQS0402, Date: March 30, 2004. Abstract: This case study presents the results of a power quality investigation at a battery manufacturing facility. The facility had been experiencing a high rate of motor failures and was experiencing problems with its computerContinue reading “PQ Investigation at a Battery Facility”

Flickering Lights

Published by Electrotek Concepts, Inc., PQSoft Case Study: Flickering Lights Wiring and Grounding Case Study, Document ID: PQS0403, March 30, 2004. Abstract: This case study concerns a residential electrical system. The homeowners were experiencing light flicker when loads were energized and de-energized in their home. INTRODUCTION Residential electric systems are served from single-phase transformers employing aContinue reading “Flickering Lights”

What Is Electrical Grounding – Top 10 Questions and Answers

Published by Pablo Diaz, P.Eng, Grounding Systems Technologies (GST), The Electricity Forum, Power Quality and Ground Articles. What is Electrical Grounding? Electrical Grounding is defined as the process of transferring the immediate discharge of electricity directly to the Earth with the help of a low-resistance wire. Electrical grounding was invented as a safety system to help prevent people andContinue reading “What Is Electrical Grounding – Top 10 Questions and Answers”

General Reference – Wiring and Grounding

Published by Electrotek Concepts, Inc., PQSoft Case Study: General Reference – Wiring and Grounding, Document ID: PQS0609, Date: July 1, 2006. Abstract: Wiring and grounding problems are responsible for many power quality variations within customer facilities. Some electric utility engineers have estimated that 80% of all the power quality problems reported by customers are found toContinue reading “General Reference – Wiring and Grounding”

What is Soil Resistivity Test and How is the Testing Done

Published by Carelabs, Carelabs is authorized provider of Electrical Installation’s Study, Analysis, Inspection, and Certification services in UAE, and offer voltage drop study and analysis services. Website: carelabz.com The resistance of an earth electrode is related to the resistivity of the soil in which it is placed and driven, and thus soil resistivity calculations and measurements isContinue reading “What is Soil Resistivity Test and How is the Testing Done”

Learn About How Earth Fault Loop Impedance Testing Is Done

Published by Carelabs (Carelabz) Why Earth Fault Loop Impedance Test is Done?  Every circuit must be tested to make sure that the actual loop impedance does not exceed that specified for the protective device concerned. Because of the severity of coming into contact with an electrical fault, having your electrical installations and power points tested forContinue reading “Learn About How Earth Fault Loop Impedance Testing Is Done”