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Impulse withstand voltage test performed on assemblies
Impulse withstand voltage test performed on assemblies (on photo: Tests in the impulse current laboratory by DEHN)Rated impulse withstand voltageOnly optional in the past, the impulse test which allow...
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Degradation of Insulation in Switchgear (What’s Really Happening)
Degradation of Insulation in Switchgear (why you should take it seriously); photo credit: Schneider ElectricPartial Discharge (PD)Electrical insulation is subjected to electrical and mechanical stress,...
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9 Recommended Practices for Grounding
9 Recommended Practices for Grounding (photo credit: ag0n.net)Basis for safety and power qualityGrounding and bonding are the basis upon which safety and power quality are built. The grounding system...
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Why it’s important to know which type of power factor correction to use
Why it’s important to know which type of power factor correction to use (on photo: 300 KVAR automatic power factor correction (APFC) panel; credit to: eamfco.com)Practical and economical...
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Should We Blame Supplier For Voltage Dips and Transients?
Should We Blame Supplier For Voltage Dips and Transients? (photo credit: microfluidics.utoronto.ca)Well, yes and no…Voltage dips and transients are usually blamed on the supplier, but this is often...
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Comparison of Motor Speed Control Methods
Comparison of Motor Speed Control Methods (on photo: single motor variable speed drive for three pocket washer-extractors; via edrodynawash.com)Why motor speed control?It is often desirable to control...
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6 Transformer Types You Can See In Commercial Installations
6 Transformer Types You Can See In Commercial Buildings (photo credit: iml.bg)Transformer Types and their CharacteristicsTransformers in commercial installations are normally used to change a voltage...
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11 Major Causes of Power System Failures
11 Major Causes of Power System Failures (on photo: Snake blamed for power outage in some of the Oklahoma substation; via ect.coop)Utility Reliability ProblemsTo gain a broader understanding of power...
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4 Low Voltage Switchboard Partitioning Forms Defined By IEC 61439-2
4 Low Voltage Switchboard Partitioning Levels Defined By IEC 61439-2 (photo credit: rgm.cr.it)Reasons for partitioning //There are 4 main reasons for partitioning a switchboard.To protect persons...
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Many engineers advocate the use of multiple-transfer switches
Many engineers advocate the use of multiple-transfer switches… (on photo: SynapSwitch Automatic Transfer Switch by Milbank)Why multiple-transfer switchesAutomatic transfer switches are primarily used...
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Maintenance of Load Tap Changers (LTCs)
Maintenance of Load Tap Changers – LTCs (photo credit: reinhausen.com)Regulating transformer’s level of reliabilityLTC maintenance is the basis for the regulating transformer’s high level of...
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6 Energy-Efficiency Improvement Opportunities In Fan Systems
6 Energy-Efficiency Improvement Opportunities In Fan Systems (photo credit: spectratechltd.com)Energy Saving PotentialEfficiencies of fan systems vary considerably across impeller types. The average...
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General Guidelines for Online Partial Discharge Testing of Power Cables
Suitable Cable Termination for online PD measurement as individual earth shield of each cable is connected to substation earth separately. Also heat shrink tubes can be seen over earth shieldsFaults in...
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Good Voltage Regulation and Justified Power Factor Correction
Good Voltage Regulation and Justified Power Factor Correction (photo credit: iskra.eu)Commercial Building CasePower factor correction and voltage regulation are closely related. In many cases, the...
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3 Lighting Essentials You Can’t Deny
3 Lighting Essentials You Can’t Deny (on photo: Mack Tech Manufacturing Facility; credit: c-j-photography.com)Light Control / Energy SavingsLighting systems in industrial facilities can represent an...
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Important Primary Distribution (Radial and Loop) System Considerations
Important Primary Distribution (Radial and Loop) System Considerations (photo credit: archer-elgin.com)Primary (distribution) feeders //The primary distribution system is that part of the electric...
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Network Distribution Transformers – Serving Grid and Spot Networks
Network Distribution Transformers – Serving Grid and Spot Networks (on photo: Transformers in an underground vault; credit: powerlines.seattle.gov)Housed in vaultsNetwork transformers, the distribution...
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Back To School – Let’s Calculate Current I3
Back To School – Let’s calculate I3Techniques for solving DC circuitsReferring to the following circuit, calculate direct current I3:Using Kirchhoff’s laws;Using nodal analysis;Applying Thévenin’s...
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Configurations and Characteristics Of Distribution Substations
Configurations and Characteristics Of Distribution Substations (on photo: Distribution Substation on the Prairie by hunter20ga via Flickr )Small, medium, and large substationsDistribution substations...
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Basic Stand-Alone Application of Reclosers
Basic Stand-Alone Application of Reclosers (photo credit: Spanish via Flickr)Overcurrent protectionReclosers are self-contained fault interrupting and reclosing devices, specifically designed for...
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