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2500-IN001 - Literature Library
2500-IN001 - Literature Library

... operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards. Activities including installation, adjustment ...
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... >Limit value monitoring ................................................................................................... Min. limit value alarm ....................................................................................................... Max. limit value alarm .......................... ...
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ups glups - Powerstar Inc
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... The training of any personnel who will have physical access to the site or the transmitter is very important. Personnel must be familiar with the transmitter, so that they can avoid physical danger, and be aware of hazards to themselves and the equipment. Nautel offers a number of training courses c ...
LAE-2012-008-T - MIT Laboratory for Aviation and the Environment
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... The cost is then the necessity for electrical power generation, as in the case of other electrical propulsion systems such as ion thrusters and Hall-e↵ect thrusters. One possible implementation is on large blimps, whose large surface areas could be useful for electricity generation via solar cells [ ...
STUDY OF UPQC FOR POWER QUALITY IMPROVEMENT MIHIR
STUDY OF UPQC FOR POWER QUALITY IMPROVEMENT MIHIR

... Today power quality [1-3] has become the most important factor for both power suppliers and customers due to the deregulation of the electric power energy market. Efforts are being made to improve the power quality. The acceptable values of harmonic contamination are specified in IEEE standard in te ...
Asian Power Electronics Journal
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... include an arrangement of semiconductors and DC voltage sources required to generate a staircase output voltage waveform. Fig. 1 shows the schematic diagram of voltage source-inverters with a different number of levels. It is well known that a two level inverter, such as the one shown in Fig. 1(a), ...
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The DatasheetArchive - Datasheet Search Engine

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... strokes, which often follow the path of the first stroke. These strokes have lower current levels, but are faster (in terms of speed to peak current). The interval between these subsequent strokes is about 60 milliseconds [2]. III. THE EFFECT OF LIGHTNING ON POWER SYSTEMS Clearly, an electrical phen ...
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... towns & small villages. Transportation should be avoided during heavy rains also. In the case of night halt or stoppage of the loaded trailer for a fairly long duration the trailer should be supported either by sleepers or providing supporting jacks on all sides thus releasing the load from the tyre ...
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... Before and during measurements please be very diligent in following instructions below: • Do not measure voltage or current in wet or dusty places; • Do not measure in presence of gas, explosive materials or combustibles; • Do not touch the circuit under test if no measurement is being taken; • Do n ...
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... Relays of this group are used mostly when "directional" operation is not required. More will be said later about "directional control" of relays; suffice it to say here that plunger or attracted-armature relays do not lend themselves to directional control nearly as well as induction-type relays, wh ...
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... power as well as RMS voltage and current and peak voltage and current. It handles other system-related functions, such as energy pulse generation, voltage sag and swell, overcurrent and zero-crossing detection, and line frequency measurement. A separate analog-to-digital converter is used for on-chi ...
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Decibel

The decibel (dB) is a logarithmic unit that expresses the ratio of two values of a physical quantity, often power or intensity. One of these quantities is often a reference value and in this case the decibel expresses the absolute level of the physical quantity. The number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities, or of the ratio of the squares of two field amplitude quantities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell; however, the bel is seldom used.The definition of the decibel is based on the measurement of power in telephony of the early 20th century in the Bell System in the United States. Today, the unit is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. The decibel confers a number of advantages, such as the ability to conveniently represent very large or small numbers, and the ability to carry out multiplication of ratios by simple addition and subtraction. By contrast, use of the decibel complicates operations of addition and subtraction.A change in power by a factor of 10 is a 10 dB change. At the half power point an audio circuit or an antenna exhibits an attenuation of 3dB. A change in voltage by a factor of 10 results in a change in power by a factor of 100, which is a 20 dB change. A change in voltage ratio by a factor of two approximately corresponds to a 6 dB change.The decibel symbol is often qualified with a suffix that indicates the reference quantity that has been used or some other property of the quantity being measured. For example, dBm indicates a reference power of one milliwatt, while dBu is referenced to approximately 0.775 volts RMS.In the International System of Quantities, the decibel is defined as a unit of measurement for quantities of type level or level difference, which are defined as the logarithm of the ratio of power- or field-type quantities.
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