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It must be emphasised that the standard electric motor is already a very efficient device with efficiencies above 80% over most of the working range, rising to over 90% at full load.

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http://electrical-engineering-portal.com/5-factors-that-mess-up-motor-efficiency-and-how-to-improve-it
An electric motor efficiency depends on the choice of materials used for the core and windings, their physical arrangement and the care and precision with
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Pre-testing of the instrument transformers and their connections must be carried out in the same manner as with conventional protection. The measuring functions of the protection devices may already be utilised for this purpose.

Read more: http://electrical-engineering-portal.com/commissioning-protection-relays
With numerical protection relays commissioning and maintenance has become far less complicated as a result of the information provided by the devices
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For specifiers, one of the most significant choices they face when specifying a low-voltage assembly, is the form of separation. Selection of an inappropriate form of separation will at the very least cause disappointment.

Continue reading - http://electrical-engineering-portal.com/download-center/books-and-guides/power-substations/forms-separation-low-voltage
Forms of Separation - For specifiers, one of the most significant choices they face when specifying a low-voltage assembly, is the form of separation
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The most common types of Power Quality problems are presented below along with their description, causes and consequences:

1. Voltage sag (or dip)
2. Very short interruptions
3. Long interruptions
4. Voltage spike
5. Voltage swell
6. Harmonic distortion
7. Voltage fluctuation
8. Noise
9. Voltage Unbalance

http://electrical-engineering-portal.com/9-most-common-power-quality-problems
The most common types of Power Quality problems are voltage sag or dip, very short and long interruptions, voltage spike, swell, harmonic distortion
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Programmable Logic Controllers (PLC) are often defined as miniature industrial computers that contain hardware and software used to perform control functions. More specifically, a PLC would be used for the automation of industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or food processing.

Learn about PLCs in details:

http://electrical-engineering-portal.com/download-center/books-and-guides/automation-control/plc-handbook
Programmable Logic Controllers (PLC) are often defined as miniature industrial computers that contain hardware and software used to perform control
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Approximately 90% of all industrial applications use three phase induction motors. Why? The standard utility service is three phase, 60 hertz. It is the most practical motor for uses requiring over five horsepower.

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http://electrical-engineering-portal.com/download-center/books-and-guides/electrical-engineering/nema-three-phase-ac-motor
Approximately 90% of all industrial applications use three phase induction motors. Why? The standard utility service is three phase, 60 hertz
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Each circuit breaker is equipped with a trip unit which actuates the circuit breaker release mechanism and allows opening on the basis of the current flowing through it. Two types of trip units are used in low voltage circuit breakers: Thermal magnetic (thermal magnetic trip unit) and Electronic (electronic trip unit).

Study ABB's guide:

http://electrical-engineering-portal.com/download-center/books-and-guides/power-system-protection/trip-characteristic-curves
An electric system shall be protected by the damages which may result from overcurrents. An overcurrent can be divided into short circuit and overload.
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Transformer noise has two sources: winding vibrations and core vibrations. The single most effective way to reduce windings noise is by having a good quality controlled winding process when assembling them.

http://electrical-engineering-portal.com/how-power-transformer-produces-acoustical-noise
Transformer noise has two sources winding and core vibrations. Magnetostriction is the main cause of the acoustical transformer noise.
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This technical article describes the basic principles of three phase systems and the difference between the different measurement connections that are possible.

http://electrical-engineering-portal.com/three-phase-power-measurement
This technical article describes the basic principles of three phase systems and the difference between the different measurement connections that are
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Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below:

http://electrical-engineering-portal.com/time-relays-setting-ranges-explained-by-siemens
Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most
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With the introduction of IEDs (Intelligent Electronic Devices), the traditional switchboard interface is being replaced by Human Machine Interface (HMI) software loaded on computer hardware. The designer has a wide choice of HMI vendors that support a wide range of functionality...

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http://electrical-engineering-portal.com/design-human-machine-interface-hmi-substation
With the introduction of IEDs (Intelligent Electronic Devices), the traditional switchboard interface is being replaced by Human Machine Interface (HMI)
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In order to design a good ventilation of switchgear and transformer rooms, the air in the room must meet various requirements. The most important is not to exceed the permissible maximum temperature.

http://electrical-engineering-portal.com/good-ventilation-of-switchgear-and-transformer-rooms
In order to design a good ventilation of switchgear and transformer rooms, the air in the room must meet various requirements
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Introduction

EEP is engineering portal dedicated to electrical science and education and it's core purpose is to spread knowledge and educate power engineers in fields of power substations, industrial automation, low voltage, medium voltage and high voltage applications, protection relays, IEC standards, lighting, KNX systems etc.

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