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 basic types of capacitor installations: individual capacitors on linear or… Read more
Feb 13, 2015 | By Edvard Csanyi
Energy and Power
Ring Main Unit (RMU) as an important part of secondary distribution substations
Before getting into “What is RMU” question, let’s say a word about the distribution system where RMU is often used. Distribution systems encompass power lines that transport energy from the transmission network or other sources to consumers, along with the… Read more
Feb 11, 2015 | By Edvard Csanyi
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 jurisdiction is detected. A conceptual diagram of relay is shown… Read more
Feb 09, 2015 | By Edvard Csanyi
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 supply system) and is classified by the UNI EN 1838 standard… Read more
Feb 06, 2015 | By Edvard Csanyi
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 occur. If for most utilities, generation integrity must be preserved… Read more
Feb 04, 2015 | By Edvard Csanyi
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; 60 tungsten lamps of 100 W each at 240 V;… Read more
Feb 02, 2015 | By Edvard Csanyi
Energy and Power
Important generator set (genset) rating considerations
A generator set (genset) consists of an engine and a generator and it is best to consider each of them as a system. Individually, each has unique characteristics, but together these qualities have a significant impact on the performance and sizing of the genset… Read more
Jan 30, 2015 | By Edvard Csanyi
Energy and Power
4 Essential Features of Transformer On-Load Tap Changer (OLTC)
On-load tap changers (or circuit tap changers), as the name suggests, permit tap changing and hence voltage regulation with the transformer on-load. Tap changing is usually done on the HV winding for two reasons: Because the currents are lower, the… Read more
Jan 28, 2015 | By Edvard Csanyi
Electrical Lectures
Miniature Circuit Breakers (MCBs) For Beginners
This technical article focuses on the widely used miniature circuit breakers rated for 240 V or less. These are smaller and lower-rated versions of industrial-grade molded-case circuit breakers rated for 600 V or less. These miniature breakers, called air circuit… Read more
Jan 26, 2015 | By Edvard Csanyi
Datacenters
Sizing a Static UPS System In Data Center
Choosing the power of a static UPS system serving a data center is a decision that involves various elements and which cannot be made before, or independently from, the choice of distribution scheme. The main elements to consider can be summarised… Read more
Jan 23, 2015 | By Edvard Csanyi
Protection
An example of transformer overload and short circuit protection
Transformer protection consists of both overload protection and short circuit protection. Overload protection is usually accomplished via proper selection of the secondary overcurrent protective device. NEC Article 450 gives specific primary and secondary overcurrent device ratings that may not be… Read more
Jan 21, 2015 | By Edvard Csanyi
Transmission and Distribution
HVDC VSC Technology For Offshore Wind Farm Applications
The demand for the power is increasing day by day. The only one solution for this is to use the renewable sources of energy like wind, solar, water etc. Among this wind can produce major amount of power. Since the… Read more
Jan 19, 2015 | By Midhun Krishnan
Low Voltage
Inspection, Test and Measurement Procedures for LV and MV (up to 36kV) Switchgear
Installed in clean, well ventilated or air-conditioned locations, switchgear will require little routine maintenance. Major inspection should be scheduled for power plant shutdowns and concentrate for low voltage switchboards on identifying contact wear, correct operation of interlocks, correct overload settings and fuse… Read more
Jan 16, 2015 | By Edvard Csanyi
Electric Motor
The most common LV/MV motor starting devices
The most common motor starting device is the low voltage motor-starting contactor. A contactor is defined as “a two-state ON-OFF device for repeatedly establishing and interrupting an electric power circuit.” Contactors are designed for optimum performance and lifetime when switching loads; they… Read more
Jan 14, 2015 | By Edvard Csanyi
Energy and Power
The consumer power substation with metering on medium voltage side
A consumer power substation with metering on medium voltage side is an electrical installation connected to a utility supply system at a nominal voltage usually between 1kV – 35kV, which for example may supply a single MV/LV transformer (exceeding generally 1250… Read more
Jan 12, 2015 | By Edvard Csanyi
