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Monthly Archive for: «June, 2013»

Surge protective categories defined by ANSI/IEEE C62.41

Three different surge protective classes or zones have been defined by ANSI/IEEE C62.41, Recommended Practice on Surge Voltages in Low Voltage Power Circuits. These classes are illustrated in the pictorial diagram Fig. 12-1. Category C (outdoors)… Read more

Jun 28, 2013 | Edvard

Surge protective categories defined by ANSI/IEEE C62.41

Few Words About Capacitor-Start (CS) Motors

The capacitor-start (CS), or more precisely, capacitor-start, induction-run motor, is a modified split-phase induction motor used for hard-to-start loads. CS motors are efficient and require starting currents about 5 times their full-load currents. The schematic… Read more

Jun 14, 2013 | Edvard

Start-run capacitor single-phase induction motor (Source ABB)

Split-phase motors for medium-duty applications

The split-phase (SP), or more accurately, the resistance-start, split-phase, induction run motor,is recommended for medium-duty applications. It can run at constant speed even under varying load conditions where moderate torque is acceptable. Split-phase motors have squirrel-cage rotors… Read more

Jun 12, 2013 | Edvard

Split-phase motors for medium-duty applications

How to calculate voltage regulation of distribution line

Introduction to voltage regulation Voltage Regulation for 11KV, 22KV, 33KV Overhead Line Permissible Voltage Regulation (As per REC) Voltage Regulation Values Required Size of Capacitor Optimum location of capacitors Voltage Rise due to Capacitor installation… Read more

Jun 10, 2013 | jiguparmar

How to calculate voltage regulation of distribution line

Glossary of Power Transformer Terms

There are many terms associated with power and distributive transformers used in electrical networks. These are just some of the most important. Feel free to add any of missing terms in the comment below ;)… Read more

Jun 05, 2013 | Edvard

Glossary of Power Transformer Terms

Transformer temperature, oil level and pressure gauges

Temperature controls are required in order to turn on and off the cooling equipment. These controls are usually combined with a visible dial-type gauge that measures ‘winding temperature’. This is really a misnomer because the… Read more

Jun 03, 2013 | Edvard

Transformer oil level indicator

High voltage testing – Direct current (DC)

DC tests are used mainly to do “pressure tests” on high voltage cables. Although the cables operate with AC, AC testing is not practical. The high capacitance of the cables necessitates AC test sets with… Read more

Jun 01, 2013 | Edvard

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