An example of the effectiveness of directional overcurrent relays (ANSI 67, 67N)

When fault currents can flow in more than one direction with respect to the load current it is often desirable to determine which direction the fault current is flowing and trip… Read more

Oct 10, 2014 | Edvard

Applications and characteristics of overcurrent potection relays (ANSI 50, 51)

Overcurrent relays are the most commonly-used protective relay type. Time-overcurrent relays are available with various timing characteristics to coordinate with other protective devices and to protect specific equipment. Instantaneous overcurrent relays have… Read more

Oct 08, 2014 | Edvard

What Is Earth And Why And How Do We Connect To It?

The thin layer of material which covers our planet – rock, clay, chalk or whatever – is what we in the world of electricity refer to as earth. So, why… Read more

Oct 06, 2014 | Edvard

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,… Read more

Oct 03, 2014 | Edvard

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… Read more

Oct 01, 2014 | Edvard

Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – 6

Read previous parts of this serie – Part 1 | Part 2 | Part 3 | Part 4 and Part 5 Proper Use of Predictive Technologies Merits and Demerits of CDM program Advantages Disadvantages CDM is more… Read more

Sep 24, 2014 | Ashok Parikh

The need for electric energy is never ending

As you guess, yes, the need for electric energy is never ending. Along with the growth in demand for electric power, sustainable development, environmental issues, and power quality and reliability… Read more

Sep 22, 2014 | Edvard

Rating Definitions Applied to Low Voltage Molded-Case Circuit Breaker (MCCB)

The molded-case circuit breaker is the “workhorse” for system protection 600V and below. A circuit breaker is a device designed to open and close by nonautomatic means and to open the… Read more

Sep 19, 2014 | Edvard

4 ways in which noise can enter a signal cable and its control – Part 2

Continued from part 1… Read here. In previous part of this technical article, I wrote about electrical noise occurs or is transmitted into a signal cable system in the following… Read more

Sep 15, 2014 | Edvard

Maintenance Management Of Electrical Equipment (Condition Monitoring Based) – 5

In case of new industry, it would be easy to implement Condition Monitoring based Maintenance Management (CDM) as apart of respective equipment or system itself after evaluating various factors discussed in… Read more

Sep 12, 2014 | Ashok Parikh