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UPS systems have historically had one or more permanently installed internal isolation transformers to provide one or more of the above functions, depending on the design of the data center power system.

Learn about isolation transformers in data centers:

http://electrical-engineering-portal.com/download-center/books-and-guides/data-center/isolation-transformers-data-center-ups

UPS systems have historically had one or more permanently installed internal isolation transformers to provide one or more of the above functions, depending
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Two-phase systems can have 3-wire, 4-wire, or 5-wire circuits. It is needed to be considering that a two-phase system is not 2/3 of a three-phase system. Balanced three-wire, two-phase circuits have two phase wires, both...

http://electrical-engineering-portal.com/scott-t-transformer-connection-overview
Main application of Scott-T Transformer is for for Industrial Furnace and for for traction purpose. It is is type of circuit used to derive two-phase
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We have all seen the motor nameplate attached on the motor side (or on top). All motors have a permanent nameplate which lists all important data, further data is usually available in the motor catalogue.

http://electrical-engineering-portal.com/motor-nameplate
We have all seen the motor nameplate attached on the motor side. All motors have a permanent nameplate which lists all important data, further data is
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You know that periodical maintenance test like partial discharge test can still leave switchgear in virtually unknown condition. Insulation defects and deterioration may very well develop in service within maintenance cycle.

http://electrical-engineering-portal.com/continuous-on-line-monitoring-of-partial-discharge-switchgear
Partial discharge (PD) is a leading indicator of an insulation problem. Quickly accelerating PD activity can result in a complete insulation failure.
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For the dimensioning of the capacitor bank to be installed in order to improve the power factor of a plant, it is necessary to calculate correctly the power factor according to the consumption or to the load cycle of the plant.

Read more about improving power factor:

http://electrical-engineering-portal.com/capacitor-bank-power-factor
For the dimensioning of the capacitor bank to be installed in order to improve the power factor of a plant, it is necessary to calculate correctly the power
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Several new factors to consider in modern power distribution systems result from two relatively recent changes. The first recent change is utility deregulation. The traditional dependence on the utility for problem analysis, energy conservation measurements and techniques, and a simplified cost structure for electricity has changed.

http://electrical-engineering-portal.com/download-center/books-and-guides/electricity-generation-t-d/power-distribution-systems
Several new factors to consider in modern power distribution systems result from two relatively recent changes. The first recent change is utility
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Direct current presents different problems than alternating current with aregard to the phenomena associated to the breaking of a short circuit current and interruption of other types of high value current since the arc extinction results to be particularly difficult.

Read more about breaking SC in a DC systems:

http://electrical-engineering-portal.com/breaking-short-circuit-current
Direct current presents different problems than alternating current with aregard to the phenomena associated to the breaking of a short circuit current
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When considering energy-efficiency improvements to a facility’s motor systems, a systems approach incorporating pumps, compressors, and fans must be used in order to attain optimal savings and performance.

http://electrical-engineering-portal.com/8-energy-efficiency-improvement-opportunities-in-electric-motors
When considering energy-efficiency improvements to a facility’s motor systems, a systems approach incorporating pumps, compressors, and fans must be
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Calculate size of each part of DOL motor starter for the system voltage 415V, 5HP three phase house hold application induction motor, code A, motor efficiency 80%, motor RPM 750, power factor 0.8 and overload relay of starter is put before motor.

http://electrical-engineering-portal.com/sizing-the-dol-motor-starter-parts-contactor-fuse-cb-thermal-overload-relay
Motor Rated Torque (Full Load Torque) = 5252 x HP x RPM. Maximum Size of Instantaneous Trip Circuit Breaker = 800% x Full Load Line Current.
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Most of the electric power in Sweden is transmissioned through the 400 kV substations that are parts of the main grid. Many of the 400 kV substations in the main grid are today old and needs to be modernized. It has also in the last years occurred a number of faults in these substations that has increased the actuality of making the substations more reliable.

Read more about 400kV substation designs:

http://electrical-engineering-portal.com/download-center/books-and-guides/electricity-generation-t-d/400-kv-substation
Most of the electric power in Sweden is transmissioned through the 400 kV substations that are parts of the main grid and they are today old and needs to
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It's great !
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One aspect of the voltage rating of an overcurrent protective device is a function of its capability to open a circuit under an overcurrent condition. Specifically, the voltage rating determines the ability of the overcurrent protective device to suppress and extinguish the internal arcing that occurs during the opening of an overcurrent condition.

http://electrical-engineering-portal.com/3-overcurrent-protective-device-ratings-you-must-properly-select
In order for an overcurrent protective device to operate properly, its voltage, ampere and interrupting ratings must be properly selected.
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How to make the right choice between fixed or withdrawable medium voltage switchgear when selecting a new equipment for power substation? The following evaluation procedure should be conducted...

Learn more about fixed and withdrawable MV switchgear:

http://electrical-engineering-portal.com/fixed-withdrawable-medium-voltage-switchgear
How to make the right choice between fixed or withdrawable medium voltage switchgear when selecting a new equipment for power substation?
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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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