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Monthly Archive for: «October, 2011»

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 shockingly high. Arc flash incidents… Read more

Oct 29, 2011 | cgoulds

Electrical safety

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 can be equipped with a… Read more

Oct 27, 2011 | Edvard

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 generally npn type. The power… Read more

Oct 27, 2011 | Edvard

NEC 2SD555 NPN POWER TRANSISTOR VCB=400V 10A 200W TO-3

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 operation. Rated current up to… Read more

Oct 25, 2011 | jiguparmar

ELCB (Earth Leakage Circuit Breaker)

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 case circuit breaker (picture above)…. Read more

Oct 23, 2011 | Edvard

air circuir breakers - how they works

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 the windings. It is therefore… Read more

Oct 22, 2011 | Edvard

Trihal transformer - Forced ventilation

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 applying a positive voltage between… Read more

Oct 21, 2011 | Edvard

IGBTs classified as punch-through (PT) and nonpunch-through (NPT) structures

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. To meet today’s demands for… Read more

Oct 17, 2011 | Edvard

VISAX MV Metal-clad Switchgear

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 a short pulse across the… Read more

Oct 15, 2011 | Edvard

Thyristor 2.5A 600V

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 when a conductor is exposed… Read more

Oct 13, 2011 | Edvard

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 configuration and also service to… Read more

Oct 13, 2011 | jiguparmar

Three-phase four wire single neutral grounded


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