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Archive: Category «Energy and Power»

Electric Motor

Motors for Hazardous Areas

Electrical drives/motors that are operated in hazardous areas must be built and engineered so that they cannot become an ignition source. This applies not only to normal operating and starting, but also… Read more

Nov 02, 2012 | By Edvard

Motors for Hazardous Areas
Energy and Power

Application of 4-pole Switchgear Devices

The majority of low-voltage switchgear is equipped with three contacts in the main circuit, which switch three-phase loads in all poles. In some applications switchgear with four main poles is… Read more

Oct 31, 2012 | By Edvard

Application of 4-pole Switchgear Devices
Cables

Corrosion Types Encountered With Power Cables

Introduction Anodic Corrosion (Stray DC Currents) Cathodic Corrosion Galvanic Corrosion Chemical Corrosion AC Corrosion Local Cell Corrosion Other Forms of Corrosion There are numerous types of corrosion, but the ones… Read more

Oct 25, 2012 | By Edvard

Corosion Types Encountered With Power Cables
Energy and Power

Safety Clearance Recommendations for Transformer

Clearance from Outdoor Liquid Insulated Transformers to Buildings (NEC) Clearance between Two Outdoor Liquid Insulated Transformers (NEC) Dry Type Transformer in Indoor Installation (NES 420.21) Dry Type Transformer in Outdoor… Read more

Oct 24, 2012 | By jiguparmar

Safety Clearance Recommendations for Transformer
Cables

The Good, The Bad and The Ugly Cable Insulation

The fundamental understanding of cable insulation properties forms the foundation for assessment of cable operability. These same fundamentals provide the basis for evaluating whether various electrical and physical tests and… Read more

Oct 23, 2012 | By Edvard

The Good, The Bad and The Ugly Cable Insulation
Electric Motor

Few Words About Three-Phase Alternator

The three-phase alternator, as the name implies, has three single-phase windings spaced such that the voltage induced in any one phase is displaced by 120º from the other two. A… Read more

Oct 20, 2012 | By Edvard

Few Words About Three-Phase Alternator
Energy and Power

Testing and Commissioning of Current Transformer

1. Objective 2. Test Equipment Required 3. Test procedures Mechanical Check and Visual Inspection Insulation Resistance Test Polarity Test Secondary/Loop Resistance Test Burden Test (optional test) Magnetization Curve Test (optional… Read more

Oct 19, 2012 | By Edvard

Testing and Commissioning of Current Transformer
Energy and Power

Simplify Downstream Installation with Cascading

Cascading provides circuit breakers placed downstream of a limiting circuit breaker with an enhanced breaking capacity. The limiting circuit breaker helps the circuit breaker placed downstream by limiting high short-circuit… Read more

Oct 16, 2012 | By Edvard

Simplify Downstream Installation with Cascading
Energy and Power

NEC Requirements for Emergency Systems

Emergency systems are generally installed in buildings that are or can be occupied by 1000 or more persons or are more than 75 ft high. These are buildings where artificial… Read more

Oct 12, 2012 | By Edvard

NEC Requirements for Emergency Systems
Energy and Power

Safety Clearance Recommendations for Electrical Panel

Working Space around Indoor Panel/Circuit Board (NES 312.2) Clearance around an Indoor electrical panel (NEC 110.26) Clearance for Conductor Entering in Panel (NES 408.5) Clearance between Bare Metal Busbar in… Read more

Oct 10, 2012 | By jiguparmar

Safety Clearance Recommendations for Electrical Panel
Energy and Power

Disturbances In LV Networks Due To Surges

There are two types of surge: those generated by a lightning impact and those resulting from electrical switchgear switching operations. Surges resulting from lightning strokes (see figure below) can affect… Read more

Oct 06, 2012 | By Edvard

Disturbances Due To Surges
Energy and Power

How to Protect Capacitor Banks?

Capacitor banks are used to compensate for reactive energy absorbed by electrical system loads, and sometimes to make up filters to reduce harmonic voltage. Their role is to improve the… Read more

Oct 05, 2012 | By Edvard

How to Protect Capacitor Banks?


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