Define voltage regulation of a transformer

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Key Takeaways • Line voltage drop, voltage regulation, and transmission efficiency are important factors that govern the performance of the transmission lines. • The voltage regulation of a transmission line varies with the effect of the line parameters R, L, and C on the line length. • In a short transmission line, the voltage regulation depends on the line current, load power factor, and line parameters R and L. Line parameters such as R, L, and C influence the magnitude of receiving end voltage in the transmission line In the history of electricity, electric power transmission has been a much-disputed topic. These disputes led to a sequence of events called “ The War of Currents“. The major debate in this “war” centered on the efficiency of Direct Current ❲DC❳ transmission and Alternating Current (AC) transmission systems. Of course, it was not a real battlefield, so no truce between opponents could be announced. Given that, the debate remained alive in the late 19th century. In the present day, A voltage drop in a transmission line causes a reduction in the receiving-end voltage ❲ VR❳ compared to the sending-end voltage ❲ VS❳. The voltage difference VS- VRshould be minimal in an economical power transmission system. Voltage regulation is a measure of how much voltage is dropped along the length of the transmission line from the sending end to the receiving end. Line Voltage Drop, Voltage Regulation, and Power Transmission Efficiency The line voltage drop in the When th...

A single-phase l0-kVA,2300/230-volt,60-Hz two-winding distribution transformer is connected as an autotransformer to step up the voltage from 2300 to 2530 volts (a) Draw a schematic diagram of this arrangement, showing all voltages and currents when delivering full load at rated voltage. (b) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of this kVA rating is transformed by magnetic induction? (C) The following data are obtained from tests carried out on the transformer when it is connected as a two-winding transformer: Open-circuit test with the low-voltage terminals excited: Applied voltage =230V, input current =0.45A, input power =70W. Short-circuit test with the high-voltage terminals excited: Applied voltage =120, input current =4.5A, input power =240W. Based on the data, compute the efficiency of the autotransformer corresponding to full load, rated voltage, and 0.8 power factor lagging. Comment on why the efficiency is higher as an autotransformer than as a two-winding transformer.

Voltages 600 V and below are referred to as “ low voltage,” voltages from 600 V-69 kV are referred to as “ medium voltage”, voltages from 69 kV-230 kV are referred to as “ high voltage” and voltages 230 kV-1,100 kV are referred to as “ extra high voltage”, with 1,100 kV also referred to as “ ultra high voltage”. The choice of service voltage is limited to those voltages which the serving utility provides. In most cases only one choice of electrical utility is available, and thus only one choice of service voltage. As the power requirements increase, so too does the likelihood that the utility will require a higher service voltage for a given installation. Table 1 – Standard nominal three-phase system voltages per ANSI C84.1-1989 Voltage Class Three-wire Four-wire Low Voltage 208 Y/120 240 240/120 480 480 Y/277 600 Medium Voltage 2,400 4,160 4,160 Y/2400 4,800 6,900 8,320 Y/4800 12,000 Y/6,930 12,470 Y/7,200 13,200 Y/7,620 13,800 13,800 Y/7,970 20,780 Y/12,000 22,860 Y/13,200 23,000 24,940 Y/14,400 34,500 34,500 Y/19,920 46,000 69,000 High Voltage 115,000 138,000 161,000 230,000 Extra-High Voltage 345,000 500,000 765,000 Ultra-High Voltage 1,100,000 In some cases a choice may be given by the utility as to the service voltage desired, in which case an analysis of the various options would be required to arrive at the correct choice. In general, the higher the service voltage the more expensive the equipment required to accommodate it will be. Maintenance and installation cos...

Voltage There are two ways to express the voltage regulation. One is voltage regulation up and another is voltage regulation down. Consider general formula for voltage regulation up as Here V nl is the no load voltage and V fl is the full load voltage. The voltage regulation up is normally used in case of transformers. Consider general formula for voltage regulation down as The voltage regulation is normally used in case of alternators and Get Definitions of Key Engineering Concepts from Chegg In engineering there are many key concepts and terms that are crucial for students to know and understand. Often it can be hard to determine what the most important engineering concepts and terms are, and even once you’ve identified them you still need to understand what they mean. To help you learn and understand key engineering terms and concepts, we’ve identified some of the most important ones and provided detailed definitions for them, written and compiled by Chegg experts.