Maintenance
Retro perspective 30 years ago: Metal-Clad or Metal-Enclosed MV Switchgear? What to choose?
There are two types of switchgear commonly applied today for switching and protection of in-plant medium voltage (4.16 kV through 34.5 kV) power distribution systems. One is metal-clad switchgear using draw-out… Read more
Oct 31, 2011 | By Edvard
Energy and Power
The Importance of the Correct PPE
Whilst awareness of the dangers of arc flash has continued to increase over the last few years, the number of incidents that are still occurring on a daily basis are… Read more
Oct 29, 2011 | By cgoulds
Transformers
Transformer Testing Techniques
Cant see this video? Click here to watch it on Youtube. Substation transformers can range from the size of a garbage can to the size of a small house; they… Read more
Oct 27, 2011 | By Edvard
Electronics
Power Semiconductor Device – Transistor
Power transistors are used in applications ranging from a few to several hundred kilowatts and switching frequencies up to about 10 kHz. Power transistors used in power conversion applications are… Read more
Oct 27, 2011 | By Edvard
Energy and Power
What is the difference between MCB, MCCB, ELCB, and RCCB
Rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal-magnetic operation. Rated current up to 1000 A. Trip current may be adjustable. Thermal or thermal-magnetic… Read more
Oct 25, 2011 | By jiguparmar
Protection
Short circuit protection of generator’s stator windings by overcurrent relays
If current transformers are not connected in the neutral ends of wye-connected generator windings, or if only the outgoing leads are brought out, protective devices can be actuated, as in… Read more
Oct 24, 2011 | By Edvard
Low Voltage
How Low-Voltage Air Circuit Breaker Works?
A low-voltage circuit breaker is one which is suited for circuits rated at 600 volts or lower. One of the most commonly used low-voltage air circuit breakers is the molded… Read more
Oct 23, 2011 | By Edvard
Transformers
Forced ventilation cycles in Trihal transformers
Transformers, when in operation, are subject to no-load losses and load losses. This energy causes a rise in the temperature of the transformer’s active part, i.e. the magnetic core and… Read more
Oct 22, 2011 | By Edvard
Electronics
Insulated-Gate Bipolar Transistor (IGBT)
The IGBT has the high input impedance and high-speed characteristics of a MOSFET with the conductivity characteristic (low saturation voltage) of a bipolar transistor. The IGBT is turned on by… Read more
Oct 21, 2011 | By Edvard
Energy and Power
Aluminium or copper busbar trunking? Myth busted!
Following years of copper being the material of choice for high power busbar trunking in the UK, yet aluminium reigning supreme in the rest of the world, Schneider Electric takes… Read more
Oct 19, 2011 | By Edvard
Electronics
Use Hall Effect Measurements to Characterize Materials
Written by Robert Green Engineers have been using Hall effect measurements to characterize materials since Edwin Hall discovered the phenomenon in 1879. The Hall effect is the generation of a… Read more
Oct 19, 2011 | By elaina
Medium Voltage
VISAX – Medium Voltage Metal-clad Switchgear
Wherever electrical power must be distributed and used with maximum availability and reliability, we have the experience and the know-how to offer you the equipment which best meets these needs…. Read more
Oct 17, 2011 | By Edvard
Electronics
Power Semiconductor Devices – Thyristor and Triac
The thyristor, also called a silicon-controlled rectifier (SCR), is basically a four-layer three-junction pnpn device. It has three terminals: anode, cathode, and gate. The device is turned on by applying… Read more
Oct 15, 2011 | By Edvard
Energy and Power
What is the Eddy Current?
Cant see this video? Click here to watch it on Youtube. Eddy currents are currents induced in conductors to oppose the change in flux that generated them. It is caused… Read more
Oct 13, 2011 | By Edvard
Energy and Power
Neutral system – Single earthed or Multi earthed?
In distribution system three phase load is unbalance and non linear so the neutral plays an very important role in distribution system. Generally, distribution networks are operated in an unbalanced… Read more
Oct 13, 2011 | By jiguparmar
