To understand and appreciate the importance of uninterrupted power supply (UPS), it is important to first understand how electricity is produced and distributed in the countries of the world you are. In many societies it is checked westernized strictly regulated and very reliable, but not in other areas, it is power and protection to the point of final consumption, whether corporate or private client to discover the needs in this direction . Perhaps we need a certain form of micro-generation and uninterruptible power supply. Current can be derived from a number of sources these days and demand for renewable technologies in response to environmental pressures: the list is longer. Coal, gas or nuclear power plants are the main methods to date, but the wind, solar energy waves have been, or begin to make their mark. The phenomenon that generates electricity is called electromagnetic induction. Its output is an alternating current (AC) waveform. The process by which this is done using magnets on a shaft which rotates induced in the vicinity of the windings (usually three), the electric current, called electromotive force. The method is used in each case the same, the only difference between different types of energy is the fuel itself, to turn the shaft. The windings in a generator are separated by 120 degrees of rotation, creating a waveform in three phases of P1 (phase 1), P2 (phase 2) and P3 (Phase 3) factors. The measurement of kV, where electricity is produced in the world varies from country to country, region to region. In the United Kingdom, for example, it is generally 25kV, that is, 275 / 400kV up before moving packaged in three-phase, 50Hz. It must be distributed with a high voltage to overcome the resistance (which in the network) or transmission losses. As it moves through the network, however, to point of use, the voltage is reduced. On the outskirts of large cities, lower voltage substations. In Great Britain would be 132 kV. These positions are still connected to smaller substations, which reduce the voltage to 33 kV and 11kV or more generally (UK). They are either found inside or near the location. It is these positions that are neutral and ground reference so that in the case of the United Kingdom can be 400VAC, three phase plus neutral and earth (TP + N + E), new Included will be delivered from a site or a building, the living (as could high-rise rental buildings), commercial or industrial secrets. The physical point at which this occurs, as the point of common coupling (PCC) is known. In the United Kingdom, is a single phase 230V supply (more for residential use by the consumer) from the same office (or kick), making him a neutral phase and derive a rule. This way, the earth and neutral reference points are all the way back into the distribution network connected to the station. Each country or region throughout the world has its own set of network transmission and distribution codes that govern the production and distribution. In particular, they provide that allows minimum and maximum voltage and frequency values. For each site, the quality of energy is received by their coup, directly affected by the performance of the electrical distribution system upstream. Today may transcontinental range and a series of political and cultural. In the problems of power distribution network can be caused by: network operations, network switching, auto re-close and troubleshooting. network hardware failure, including transformers and circuit failures. The outages during periods of peak demand when supply is limited. accidental interruption of supply during the construction or street work. The acts of terrorism, vandalism or sabotage. The environmental activities such as lightning, heat, rain, snow, ice, wind or animals. On each side, a stable and clean power will be affected and influenced by local congestion, equipment and operation simple mistake of industrial equipment and facilities – including power presses, welding equipment, elevators, escalators, air conditioners, photocopiers and fluorescent tubes. All these factors may have problems with food in an alternating current supply caused remained relatively stable and clean may have before. is a review of electricity generation and distribution and the effect will be to power quality (as well as other environmental, social and political unrest that may have an influence) has a baring on the size and type of UPS, this ideal may be an installation. This article is based on information from the Guide to protection of food – from planning, installation and operation of uninterruptible power systems (ISBN: 9780955442 803). By Robin Koffler and Jason Yates of Riello UPS.