File Name: relation between line voltage and phase voltage in star connection .zip
Orders delivered to U. Learn more. If the three-phase loads are balanced each having equal impedances , the analysis of such a circuit can be simplified on a per-phase basis. This follows from the relationship that the per-phase real power and reactive power are one-third of the total real power and reactive power, respectively.
It is very convenient to carry out the calculations in a per-phase star-connected line to neutral basis. Two three-phase load connections that are commonly used in the ac circuits were given in Fig. In this section, the voltage and the current functions are examined while the three-phase loads are connected to the star-connected three-phase supplies, shown in Fig.
Figure Two common balanced-load connections in three-phase ac circuits. In Fig. Similarly, i 1p , i 2p , i 3p , i 12p , i 23p , and i 31p are the phase currents, and i 1L , i 2L , and i 3L are the line currents. In a balanced three-phase system, there is a very simple relationship between the line and phase quantities, which can be obtained from the phasor quantities or the time-varying expressions of the voltages and the currents.
The voltage and current relationships in three-phase ac circuits can be simplified by using the rms values I and V of the quantities. Refer to Fig. Phase current:. Phase voltage:. The VI provides a visual aid to understanding the definitions of phase and line voltages and phase and line currents in the delta- and the star-connected ac systems that contain the loads as well as the ac supplies. In addition, the instantaneous voltage and currents are displayed in the front panel of the VI. Study the concept in question 1 this time for the line currents and the phase currents in the case of a delta-connected three-phase load.
In question 2, find out the angles in degrees between the phase and the line quantities on the supply side and the load side. Use the single-phase equivalent circuit in each load configuration and calculate the phase currents for given values of the voltage and the load impedance.
Three incandescent lamps rated 60 W, V rms are connected in the delta form. What line voltage is needed so that the lamps burn normally at rated conditions? What are the line and phase currents in the circuit? Hint : First calculate and set the resistance of the lamps using the controls provided.
Three load resistors are connected in the delta form. If the line voltage is V rms and the line current is A rms , calculate the current in each resistor, the voltage across the resistors, and the resistance of each resistor.
Verify the results analytically. The three-phase load is connected to a V rms, line voltage and 50 Hz three-phase star-connected supply.
Calculate the phase and line currents. I would like to receive exclusive offers and hear about products from InformIT and its family of brands.
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Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. The Effect of Delta and Star Connections upon Transformer Wave Forms Abstract: The purpose of the paper is to show the distortions resulting from different symmetrical three-phase connections of generator and transformers without transmission line, as dependent upon the hysteresis cycle and the admittance of the transformers at no-load. Tests were made with the oscillograph to show the no-load exciting current and voltage waves of three single-phase step-up transformers when the windings of the generator and both sides of the transformers were connected in all possible symmetrical delta and star relations. Tests are divided into four groups, according to the connection of the generator. In all cases normal low-tension line voltage was held, but voltage and current measurements were considered less important than the recording of wave forms.
In the Star Connection , the similar ends either start or finish of the three windings are connected to a common point called star or neutral point. The three-line conductors run from the remaining three free terminals called line conductors. The wires are carried to the external circuit, giving three-phase, three-wire star connected systems. However, sometimes a fourth wire is carried from the star point to the external circuit, called neutral wire , forming three-phase, four-wire star connected systems. Considering the above figure, the finish terminals a 2 , b 2 , and c 2 of the three windings are connected to form a star or neutral point.
This configuration of voltage sources is characterized by a common connection point joining one side of each source. Figure below. The three conductors leading away from the voltage sources windings toward a load are typically called lines , while the windings themselves are typically called phases. In a Y-connected system, there may or may not Figure below be a neutral wire attached at the junction point in the middle, although it certainly helps alleviate potential problems should one element of a three-phase load fail open, as discussed earlier. Line voltage refers to the amount of voltage measured between any two line conductors in a balanced three-phase system.
Relation Between Phase Voltage and Line Voltage in Star Connection. The Star connection is shown in the figure below: star-connection-fig2 As the system is.
Table of Contents. In Star also denoted by Y system of interconnection, the starting ends or finishing ends similar ends of three coils are connected together to form the neutral point.
Спасибо. Джабба выдавил из себя смешок и попытался обратить все в шутку. - Если только Стратмор не придумал что-то особенное и не обошел мои фильтры. Повисла тягостная тишина. Когда Мидж заговорила, ее голос был мрачным: - Стратмор мог обойти фильтры. Джабба снова вздохнул. - Это была шутка, Мидж.
Делай свою распечатку и выметайся! - зарычал. - Si, senor, - засмеявшись, ответила Мидж с подчеркнутым пуэрто-риканским акцентом и, подмигнув Бринкерхоффу, направилась к двойной двери директорского кабинета. Личный кабинет Лиланда Фонтейна ничем не походил на остальные помещения дирекции. В нем не было ни картин, ни мягкой мебели, ни фикусов в горшках, ни антикварных часов. Здесь все было подчинено одному требованию - эффективности. Стол, накрытый стеклом, и черный кожаный стул были расположены прямо перед громадным венецианским окном. Три шкафа-картотеки стояли в углу рядом с маленьким столиком с французской кофеваркой.
Он решительно подошел к терминалу и запустил весь набор программ системных оценок ТРАНСТЕКСТА. - Твое сокровище в беде, коммандер, - пробормотал .
Действительно. - Клушар вздохнул с видом мученика, вынужденного терпеть всякий сброд. - Вы когда-нибудь видели что-либо более ужасное, чем это место? - Он обвел глазами палату.
Тела танцующих слились так плотно, что он не мог рассмотреть, во что они одеты.
Ты ранена? - Стратмор положил руку ей на плечо. Она съежилась от этого прикосновения. Он опустил руку и отвернулся, а повернувшись к ней снова, увидел, что она смотрит куда-то поверх его плеча, на стену.
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