Author Archives: PQBlog

Learn What is Earth Ground Test, Why and How is it done?

Published by Carelabs (Carelabz) Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity. Various governments and agencies have developed stringent requirements for electrical products that are sold world-wide. Several tests are conducted to check the safety of products. One among that is earth test. Potentially the most dangerousContinue reading “Learn What is Earth Ground Test, Why and How is it done?”

What is Leakage Current Testing and Measuring, How is it done?

Published by Carelabs (Carelabz) Leakage current is the current that streams from either DC or AC circuit in an equipment to the ground or framework and can be from the output or input. If the equipment is not properly grounded, the current flows through other paths such as the human body. This mighty also occur if the ground is incompetent or is disrupted unintentionally or intentionally.  The leakage current in anContinue reading “What is Leakage Current Testing and Measuring, How is it done?”

Power Quality Measurement and Analysis Basics

Published by Randy Barnett, Certified Energy Auditor and Trainer for NTT, Centennial, Colo. Email: randy@randybarnett.net , March 1st, 2012. How to interpret the results of a power quality site survey Analyzing electrical parameters associated with distributing electricity is viewed by many as complex engineering work. Yet, for engineers, electricians, and technicians troubleshooting equipment problems theseContinue reading “Power Quality Measurement and Analysis Basics”

Beware of Asymmetry – Causes, Consequences, Measurement and Control

Published by Sonel Three-phase motors are overheating! Overcurrent breakers are triggering without a reason! Energy bills are higher than expected! Undesirable Asymmetry The economic benefits of energy suppliers and their users are strongly dependent on reliability, safety and efficiency of the power system. One of the phenomena that is strongly related to the efficiency ofContinue reading “Beware of Asymmetry – Causes, Consequences, Measurement and Control”

Revised IEC and IEEE Standards for PQ Measurements for Users of PQ Monitoring Equipment

New and revised Standards for Power Quality measurements from IEC and IEEE and their benefit to users of PQ monitoring equipment that is compliant with these new standards general information refer to the actual standard for additional details. IEC 61000-4-30 Class A Edition 3 The IEC 61000-4-30 Class A standard defines the measurement methods, timeContinue reading “Revised IEC and IEEE Standards for PQ Measurements for Users of PQ Monitoring Equipment”

Application Guide for Solving Harmonic Problems

Published by MYRON ZUCKER INC. , Website: http://www.myronzucker.com Definitions Harmonics are multiples of the fundamental frequency of an electrical power system. If, for example, the fundamental frequency is 60 Hz, then the 5th harmonic is five times that frequency, or 300 Hz. Likewise, the 7th harmonic is seven times the fundamental, or 420 Hz, andContinue reading “Application Guide for Solving Harmonic Problems”

Harmonic Current and Voltage Distortion

Published by Michael Z. Lowenstein, President of Harmonics Ltd., Monroe, Conn. Nov 1st, 2002. To obtain the effective voltage for a system in which voltages of several frequencies are present, you must add the voltages in an rms fashion. Understanding the causes, similarities, and differences between current and voltage distortion will help you pinpoint mostContinue reading “Harmonic Current and Voltage Distortion”