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Monthly Archive for: «October, 2014»

Applications and characteristics of differential relays (ANSI 87)

Differential relays generally fall within one of two broad categories: Current-differential and High-impedance differential Current-differential relays are typically used to protect large transformers, generators, and motors. For these devices detection of low level winding-to-ground faults is essential… Read more

Oct 29, 2014 | Edvard

Applications and characteristics of differential relays (ANSI 87)

Automation Migration Strategy in 3 Phases

Owing to competitive pressures in the marketplace, a company often needs to introduce a new product in the shortest possible time. The easiest and least expensive way to accomplish this objective is to design a… Read more

Oct 27, 2014 | Edvard

Guidelines to maintenance of low voltage switchboard

A well-executed maintenance program can provide the following benefits: Longer life of switchboard and fewer replacements; Reduced time on repairs and overhauls, and the option of scheduling them at an opportune time; Fewer failures with unexpected… Read more

Oct 24, 2014 | Edvard

Guidelines to maintenance of low voltage switchboard

9 Most Common Power Quality Problems

The most common types of Power Quality problems are presented below along with their description, causes and consequences: Voltage sag (or dip) Very short interruptions Long interruptions Voltage spike Voltage swell Harmonic distortion Voltage fluctuation… Read more

Oct 20, 2014 | Edvard

9 Most Common Power Quality Problems

Rating Definitions Applied to Medium Voltage Fuses

The definition of low voltage fuses is equally applicable to medium voltage fuses. Medium voltage level is defined by standard ANSI C84 as containing standard system voltages from 2400 through 69,000 V, and the high voltage level… Read more

Oct 03, 2014 | Edvard

Rating Definitions Applied to Medium Voltage Fuses

Energy Efficiency Aspects of Electric Motors

Three-phase squirrel-cage induction motors comprise a considerable percentage of the electrical load in the United States. Design, operation, and maintenance of these machines is well described in some of the articles already published. This article focuses… Read more

Oct 01, 2014 | Edvard

Energy Efficiency Aspects of Motors


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