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The Most Common LV/MV Motor Starting Devices
The Most Common LV/MV Motor Starting Devices (on photo: Allen Bradley contactor)Two-state ON-OFF deviceThe most common motor starting device is the low voltage motor-starting contactor. A contactor is...
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Inspection, Test and Measurement Procedures for LV and MV (up to 36kV)...
Inspection, Test and Measurement Procedures for LV and MV (up to 36kV) Switchgears (on photo” Eaton Cutler Hammer Magnum DS Switchgear Inspection, and Transformer Testing)Importance of checks and...
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HVDC VSC Technology For Offshore Wind Farm Applications
HVDC VSC Technology For Offshore Wind Farm Applications (on photo: Alstom’s HVDC VSC demonstrator, Stafford, UK.Offshore Wind FarmsThe demand for the power is increasing day by day. The only one...
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An Example Of Transformer Overload and Short-Circuit Protection
An Example Of Transformer Overload and Short-Circuit Protection (photo credit: ABB; Mariano Berrogain)NEC Article 450 // Transformers VaultsTransformer protection consists of both overload protection...
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Sizing a Static UPS System In Data Center
Sizing a Static UPS System In Data Center (on photo APC UPS device; by Matthew Landry via Flickr)UPS system serving a data centerChoosing the power of a static UPS system serving a data center is a...
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Miniature Circuit Breakers (MCBs) For Beginners
Miniature Circuit Breakers (MCBs) For BeginnersDual functions of a switch and a fuseThis technical article focuses on the widely used miniature circuit breakers rated for 240 V or less. These are...
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4 Essential Features of Transformer On-Load Tap Changer (OLTC)
4 Essential Features of Transformer On-Load Tap Changer (photo credit: on-electricity.blogspot.fr)Done on the HV windingOn-load tap changers (or circuit tap changers), as the name suggests, permit tap...
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Important Generator Set Rating Considerations
Generator Set Rating Considerations (on photo: Caterpiller diesel genset via walterspower.com)Rating DefinitionsA generator set (genset) consists of an engine and a generator. However, it is best to...
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Calculating Max. Demand Kilovolt-Amperes and Required Cable Current Rating
Calculating Max. Demand Kilovolt-Amperes and Required Cable Current RatingA building site and electrical equipmentA building site is to have the following electrical equipment available for use:Tower...
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Voltage Imbalance Protection of Synchronous Generator (ANSI Code 60)
Voltage Imbalance Protection of Synchronous Generator (ANSI Code 60)Synchronous Generator ProtectionIn an apparatus protection perspective, generators constitute a special class of power network...
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Emergency Lighting Power Supply in Data Center
Emergency Lighting Power Supply in Data Center (photo credit: datacenterjournal.com)When standard lighting fails…Lighting is defined as emergency lighting when it is intended for operation when...
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A real life analogy of the jurisdiction of the protection relay
An Example of Relay Used To Protect the Transmission Line Under Fault (For Beginners)To Protect the Transmission Line Under FaultFormally, a relay is a logical element which processes the inputs...
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Ring Main Unit (RMU) as an important part of secondary distribution substations
Ring Main Unit as an important part of Secondary Distribution Substations (on photo: ABB’a 24kV RMU type ‘SafeRing’)RMUA Ring Main Unit (RMU) is a totally sealed, gas-insulated compact switchgear unit....
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How can I select the right capacitors for my specific application needs?
How can I select the right capacitors for my specific application needs? (photo credit: mediarede.com)Power factor correctionOnce you’ve decided that your facility can benefit from power factor...
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Selection of HV Conductors And Earth Wires
Selection of HV Conductors And Earth Wires (on photo: Conventional ACSR and modern ACCC conductors; via Wikipedia)Aluminium ACSR ConductorsConductors represent the most important component of an...
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Smart Load Management Strategies To Save Energy
An example of a load-management strategyHow utilities understand the loads…As part of their drive towards synchronizing the consumption and production of electrical energy over the long term, energy...
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Basic Transformer Routine Test – Measurement of Winding Resistances
Measurement of the transformer winding resistances (photo credit: colvininfrared.com)Purpose of the measurementThe resistance between all pairs of phase terminals of each transformer winding are...
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Do Not Energize Oil-Filled Transformer Without Performing These 15 Tests and...
Do Not Energize Oil-Filled Transformer Without Performing These 15 Tests and Checks! (on photo 3-core type oil-immersed rectifier transformer 380kV; via electric-power-transformers.com)Obligatory...
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4 Practical Approaches To Minimize Voltage Drop Problems
4 Practical Approaches To Minimize Voltage Drop Problems (photo credit: lhcb-elec.web.cern.ch)What NEC states for max. voltage drop?The NEC states in an Informational Note that a maximum voltage drop...
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6 Recommended Practices for Power Quality
6 Recommended Practices for Power Quality (photo credit: fluke.com)Poor power quality because of…Power quality concerns have traditionally focused on harmonics, which are generated by nonlinear loads,...
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