Energy and Power
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
Cables
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
Testing and Commissioning
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
Testing and Commissioning
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
Energy and Power
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
High Voltage
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
Energy and Power
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
Medium Voltage
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
Energy and Power
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
Datacenters
Emergency Lighting Power Supply in Data Center
Lighting is defined as emergency lighting when it is intended for operation when standard lighting fails. Emergency lighting must be powered by an independent energy source (typically a central power… Read more
Feb 06, 2015 | By Edvard
Energy and Power
Voltage Imbalance Protection of Synchronous Generator (ANSI Code 60)
In an apparatus protection perspective, generators constitute a special class of power network equipment because faults are very rare, but can be highly destructive and therefore very costly when they… Read more
Feb 04, 2015 | By Edvard
Energy and Power
Calculating Max. Demand Kilovolt-Amperes and Required Cable Current Rating
A building site is to have the following electrical equipment available for use: Tower crane, electric motors totalling 75 kW at 415 V; Sump pump, 5 kW at 240 V;… Read more
Feb 02, 2015 | By Edvard
