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Power system analysis through numerical modeling and digital solutions

We all know that the electrical energy is produced at the generating station, and then transported to the consumers through a network of transmission and distribution systems. However, it’s often…...

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Released on Jul 17, 2020

Power system analysis through numerical modeling and digital solutions

Commissioning specifications for MV/LV electrical power equipment and systems

The NETA Acceptance Testing Specifications was developed for use by those responsible for assessing the suitability for initial energization of electrical power equipment and systems and to specify field tests…...

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Released on Apr 23, 2020

Commissioning specifications for MV/LV electrical power equipment and systems

The essentials of power-system operation and analysis

The equivalent circuit of one phase of a transformer referred to the primary winding is shown in Figure 1 below. The resistances and reactances can be found from the well…...

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Released on Apr 03, 2020

The essentials of power-system operation and analysis

Principal voltage control and protection aspects of a power system

VAR generators are distinguished as either rotating electrical machines or static power electronics converters. The unique feature of VAR generators is their ability to deliver or absorb reactive power with…...

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Released on Mar 19, 2020

The hybrid reactive power compensation system installed in Kriftel in the German grid

Harmonic penetration in the power systems and passive filters design (study cases incl.)

Many technologies are available and constantly being advanced to control the harmonics at source. Where the harmonic levels are low, the equipment can be designed to withstand the effect of…...

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Released on Feb 19, 2020

Harmonic penetration in the power systems and passive filters design (study cases incl.)

Life extension techniques for T&D electrical equipment

The development of novel comprehensive diagnostics for HV equipment became an integrated part of condition maintenance concepts. A combination of maintenance and measurement activities is covered by the application of…...

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Released on Jan 30, 2020

Life extension techniques for T&D electrical equipment

Short-circuit load flow and harmonics distortion analysis in a power system

There is a strong relationship between voltage and reactive power flow, though real power flow on loaded circuits may further escalate the voltage problem. The voltages in a distribution system…...

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Released on Jan 01, 2020

Short-circuit load flow and harmonics analysis in a power system

Synchronous and variable speed generators for graduate students and R&D engineers

Electric generators operate traditionally either in large power grids – with many of them in parallel to provide voltage and frequency stability to changing load demands, or they stand alone…....

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Released on Nov 22, 2019

Synchronous and variable speed generators for graduate students and R&D engineers

The study of electric power quality – Measurement techniques and issues

Electric power quality is a term that refers to maintaining the near sinusoidal waveform of power distribution bus voltages and currents at rated magnitude and frequency. Thus power quality is…...

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Released on Nov 07, 2019

The study of electric power quality - Measurement techniques and issues

Fault location and service restoration for electrical distribution systems

The Auto‐Reclosure Device (ARD) is such an autonomous device that it automatically interrupts and recloses the circuit breaker with a preset sequence of opening and reclosure when a fault occurs…...

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Released on Oct 17, 2019

Fault location and service restoration for electrical distribution systems

Recommended practice for calculating short-circuit currents in power systems

A running induction motor that has a bolted three-phase short circuit suddenly connected across its terminals will contribute currents to the short circuit. Typical fault current vs. time plots are…...

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Released on Sep 26, 2019

Recommended practice for calculating short-circuit currents in power systems

Digital distance relaying technology for protecting transmission lines

Extra High Voltage (EHV) and Ultra High Voltage (UHV) transmission lines are mostly used to transmit bulk power over long distances. Nowadays, series compensated transmission lines are widely used in…...

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Released on Sep 12, 2019

Digital distance relaying schemes for protecting transmission lines

Network fault analysis and evaluation of solutions to distributed generation issues

Due to concerns of climate change, an increasing number of distributed generation (DG) units have been installed globally in the last two decades. This lead to issues on many aspects…...

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Released on Aug 29, 2019

Network fault analysis and evaluation of solutions to distributed generation issues

Measurements and analysis of harmonics in transmission power systems

The problem of non-sinusoidal waveforms in electrical power systems is surprisingly very old, the first studies described in the literature are dated to 1890’s. Reports that the first documented harmonic…...

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Released on Aug 15, 2019

Measurements and analysis of harmonics in transmission power systems

Transformer condition monitoring and fault diagnosis techniques

Power transformers are commonly considered as the heart of the transmission and distribution power system networks. They are in service under different environmental, electrical and mechanical conditions and may be…...

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Released on Aug 02, 2019

Transformer condition monitoring and fault diagnosis techniques

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