Comparison of motor speed control methods
It is often desirable to control the motor speed, usually for reasons process control for such variables as flow or pressure. Such applications as fans and pumps often have varying… Read more
Mar 13, 2015 | By Edvard Csanyi
Should We Blame Supplier For Voltage Dips and Transients?
Voltage dips and transients are usually blamed on the supplier, but this is often unfair. There are many potential on-site causes; for example, starting of heavy loads may cause voltage… Read more
Mar 11, 2015 | By Edvard Csanyi
Why it’s important to know which type of power factor correction to use
It’s important to understand where the capacitors are to be installed for a better exploitation of such advantages. There are no general rules applicable to every type of installation and, in… Read more
Mar 09, 2015 | By Edvard Csanyi
9 Recommended Practices for Grounding
Grounding and bonding are the basis upon which safety and power quality are built. The grounding system provides a low-impedance path for fault current and limits the voltage rise on… Read more
Mar 06, 2015 | By Edvard Csanyi
Degradation of Insulation in Switchgear (What’s Really Happening)
Electrical insulation is subjected to electrical and mechanical stress, elevated temperature and temperature variations, and environmental conditions especially for outdoor applications. In addition to normal operating conditions, there are a… Read more
Mar 04, 2015 | By Edvard Csanyi
Impulse withstand voltage test performed on assemblies
Only optional in the past, the impulse test which allow defining the rated impulse withstand voltage Uimp, is now a necessity thus demonstrating the strategy of the Standards directed to… Read more
Mar 02, 2015 | By Edvard Csanyi
6 recommended practices for increasing the power quality
Power quality concerns have traditionally focused on harmonics, which are generated by nonlinear loads, although there are many other concerns regarding isolating sensitive loads from transient disturbances, uneven ground potentials, or phase… Read more
Feb 27, 2015 | By Edvard Csanyi
4 practical approaches to minimize voltage drop problems
The NEC states in an Informational Note that a maximum voltage drop of 3% for branch circuit conductors, and 5% for feeder and branch circuit conductors together, will provide reasonable… Read more
Feb 25, 2015 | By Edvard Csanyi
Do Not Energize Oil-Filled Transformer Without Performing These 15 Tests and Checks!
The following tests and checks should be performed at a minimum to ensure that the transformer is ready to be energized. Do not energize the transformer without performing these tests… Read more
Feb 23, 2015 | By Edvard Csanyi
Basic Transformer Routine Test – Measurement of Winding Resistances
The resistance between all pairs of phase terminals of each transformer winding are measured using direct current. Furthermore the corresponding winding temperature is measured. The measured resistances are needed in… Read more
Feb 20, 2015 | By Edvard Csanyi
Smart Load Management Strategies To Save Energy
As part of their drive towards synchronizing the consumption and production of electrical energy over the long term, energy distribution companies tailor their rates to encourage consumers to reduce their… Read more
Feb 18, 2015 | By Edvard Csanyi
Selection of high voltage conductors and earth wires
Conductors represent the most important component of an overhead power line because they have to ensure economical and reliable transmission and contribute considerably to the total line costs. For many… Read more
Feb 16, 2015 | By Edvard Csanyi
How can I select the right capacitors for my specific application needs?
Once you’ve decided that your facility can benefit from power factor correction, you’ll need to choose the optimum type, size, and number of capacitors for your plant. There are two… Read more
Feb 13, 2015 | By Edvard Csanyi
Ring Main Unit (RMU) as an important part of secondary distribution substations
A Ring Main Unit (RMU) is a totally sealed, gas-insulated compact switchgear unit. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers. Different… Read more
Feb 11, 2015 | By Edvard Csanyi
A real life analogy of the jurisdiction of the protection relay
Formally, a relay is a logical element which processes the inputs (mostly voltages and currents) from the system/apparatus and issues a trip decision if a fault within the protection relay‘s… Read more
Feb 09, 2015 | By Edvard Csanyi