Automation

Maintains position information when power is removed from a system. Once power is restored the position of the encoder is available immediately.

Maintains position information when power is removed from a system. Once power is restored the position of the encoder is available immediately

Generator

The standard unit of electrical current.

A type of electrical explosion that results from a low-impedance connection to ground or another voltage phase in an electrical system.

A group of welding procedures that fuse metal pieces by melting them together, using heat from an electric arc between an electrode and the work piece. The arc is caused by electrical current flowing though plasma consisting of ionized air molecules and metal ions. Material from the electrode is transferred to the work piece, and the electrode is consumed over time. Arc-welding processes are attractive because of their low capital and running costs.

The area of a factory set up to weld metals using electric arcs.

The registered trademark of a family of modular electric propulsion systems for ships, the first of which was co-developed by ABB in the 1980s. The Azipod unit is fitted to the ship’s hull externally in a pod, or casing, and combines the functions of a propulsion motor, main propeller, rudder and stern thruster. Since these functions are no longer installed as separate units inside the ship, space onboard can be used for other purposes. Azipod units also contribute to improved hydrodynamics, which result in fuel savings of around 15 percent compared to conventional propulsion systems.

In HVDC terms, links used to connect neighboring grids are often referred to as connections, indicating that the distance between the two grids is minimal. Such connections are able to link independent power grids, including those operating at different frequencies, and enable power to flow from one grid to another. This means that generators on either grid can be used to secure the supply of electricity across the extended network. The connections can also improve voltage and frequency stability in the linked grids

. In computing, bandwidth is often a synonym for the rate of information transmitted by a network connection or interface. For example, a bandwidth might be described as 56K, which means it is capable of transmitting 56,000 of information per second. A bit is the smallest unit of computerized data, comprising a single binary digit (ie, 1 or 0).

The ability of a device to store an electrical charge (electrical charge is what flows in electric current). Capacitance is used in many different applications. The Farad is a very large unit and capacitances are usually on the order of microfarads, µF (1 µF = 10-6 F) and picofarads,pF (1 pF = 10-12 F).

1.This is electrical current that does not alternate, the electrons flow through the circuit in one direction. 2.DC does not generate reactive power

A device that converts electrical energy into mechanical energy that can be used to drive mechanical equipment.

Refers to a group of technologies that enhance the security, capacity and flexibility of power transmission and distribution systems. The technologies can be installed in new or existing power transmission and distribution lines. Examples of FACTS devices are: Static var compensation (SVC), uses an electrical device to regulate and stabilize voltage in bulk power systems. The most advanced version of this technology is called SVC Light and has additional features, in particular more powerful flicker compensation to stabilize heavy and rapidly fluctuating loads, for example arc furnaces, and to smooth voltage flicker. Series Compensation can be fixed or controllable. The latter is called Thyristor Controlled Series Capacitor (TCSC). Series compensation is a straightforward and cost effective way to improve power transmission capacity and preserve voltage stability, particularly in bulk transmission corridors. Thyristor-controlled series compensation is especially useful for damping power oscillation over interconnections between transmission girds. FACTS devices optimize power flow to maximize the capacity of power lines and improve voltage stability by reactive power compensation.

A device that converts rotating mechanical movement into electric power. The current generated can be either alternating (AC) or direct (DC).

Generally, harmonics are oscillations in the base power frequency. In electrical AC systems, the base frequency is typically 50 or 60 hertz (Hz) and harmonics occur in multiples of this, for example 100 Hz, 150 Hz,200 Hz, etc. where the base frequency is 50 Hz. Harmonics occur whenever there is a disturbance of the voltage or current, eg, if the current is interrupted or if AC current is synthesized in a converter.

PLAYS MOST IMPORTANT ROLE . ALL MONITORING AS WELL AS CONTROL IS DONE BY PLC .