# Open Circuit And Short Circuit Test On Three Phase Transformer Pdf

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## Open Circuit and Short Circuit Test on Transformer

These two transformer tests are performed to find the parameters of equivalent circuit of transformer and losses of the transformer. Open circuit test and short circuit test on transformer are very economical and convenient because they are performed without actually loading of the transformer. Open circuit test or no load test on a transformer is performed to determine 'no load loss core loss ' and 'no load current I 0 '. The circuit diagram for open circuit test is shown in the figure below. Usually high voltage HV winding is kept open and the low voltage LV winding is connected to its normal supply.

## Short-circuit test

It is possible to predict the performance of a transformer at various loadings by knowing all the equivalent circuit parameters. Without actually loading the transformer, these two assessed tests give the test results which are used to determine the equivalent circuit parameters. By these parameters, we can easily predetermine the efficiency and regulation of the transformer at any power factor condition as well as at any load condition. This method of finding the parameters of a transformer is called as an indirect loading method. This article enumerates how to perform these tests, how determine the equivalent parameters from test data and significance HV or LV side in which the calculation to be performed. This test is performed to find out the shunt or no load branch parameters of equivalent circuit of a transformer.

If it is used for converting power from a high voltage to a low voltage, it is called a step-down transformer. The conversion efficiency of a power transformer is extremely high and almost all of the input power is supplied as output power at the secondary winding. The transformer may be represented by the equivalent circuit shown in figure 3. The parameters may be referred to either the primary or the secondary side. The series resistances R 1 and R 2 represent the copper loss in the resistance of the two windings. The series reactances X 1 and X 2 are leakage inductances and account for the fact that some of the flux established by one of the windings does not fully couple the other winding.

## Open Circuit Test and Short Circuit Tests

To determine the circuit constant, efficiency and regulation of a transformer, without actually loading the transformer, we perform Open-Circuit and Short-Circuit tests. These tests give more accurate result than compared with the fully loaded transformer. And the power consumption in these tests is minimal as compared with the transformer's output on full load.

### Short-circuit test

The open circuit and short circuit test are performed for determining the parameter of the transformer like their efficiency, voltage regulation, circuit constant etc. These tests are performed without the actual loading and because of this reason the very less power is required for the test. The open circuit and the short circuit test gives a very accurate result as compared to the full load test. The purpose of the open-circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameters are determined. This test is performed on the primary winding of the transformer.

Click here to visit Engineering Pro Guides. Facebook Twitter. These tests are very convenient as they provide the required information without actually loading the transformer. Further, the power required to carry out these tests is very small as compared with the full-load output of the transformer. These tests consist of measuring the input voltage, current and power to the primary first with secondary open-circuited open-circuit test and then with the secondary short-circuited short circuit test.

Facebook Twitter. These tests are very convenient as they provide the required information without actually loading the transformer. Further, the power required to carry out these tests is very small as compared with the full-load output of the transformer. These tests consist of measuring the input voltage, current and power to the primary first with secondary open-circuited open-circuit test and then with the secondary short-circuited short circuit test. This test is conducted to determine the iron losses or core losses and parameters R 0 and X 0 of the transformer.

#### Short circuit or Impedance test on Transformer

Не обращайте на него внимания, - засмеялась.  - Он просто расстроен. Но он получит то, что ему причитается.  - Она встряхнула волосами и подмигнула. - Может быть, все-таки скажете что-нибудь .

Кардиналу надоело выходить из церкви через главный вход подобно обычному грешнику. ГЛАВА 96 Промокшая и дрожащая от холода, Сьюзан пристроилась на диванчике в Третьем узле. Стратмор прикрыл ее своим пиджаком. В нескольких метрах от них лежало тело Хейла. Выли сирены. Как весенний лед на реке, потрескивал корпус ТРАНСТЕКСТА. - Я спущусь вниз и отключу электропитание, - сказал Стратмор, положив руку на плечо Сьюзан и стараясь ее успокоить.

ГЛАВА 50 Фил Чатрукьян остановился в нескольких ярдах от корпуса ТРАНСТЕКСТА, там, где на полу белыми буквами было выведено: НИЖНИЕ ЭТАЖИ ШИФРОВАЛЬНОГО ОТДЕЛА ВХОД ТОЛЬКО ДЛЯ ЛИЦ СО СПЕЦИАЛЬНЫМ ДОПУСКОМ Чатрукьян отлично знал, что к этим лицам не принадлежит. Бросив быстрый взгляд на кабинет Стратмора, он убедился, что шторы по-прежнему задернуты. Сьюзан Флетчер минуту назад прошествовала в туалет, поэтому она ему тоже не помеха.

Сожаление. Снова и снова тянется его рука, поблескивает кольцо, деформированные пальцы тычутся в лица склонившихся над ним незнакомцев. Он что-то им говорит. Но что. Дэвид на экране застыл в глубокой задумчивости.

Мрачный голос Стратмора вывел ее из задумчивости.

Беккер, стараясь преодолеть эту тяжесть, приподнялся на локтях. Теперь он был на виду, его голова торчала из оконного проема как на гильотине. Беккер подтянул ноги, стараясь протиснуться в проем. Когда его торс уже свисал над лестницей, шаги послышались совсем. Он схватился руками за боковые стороны проема и, одним движением вбросив свое тело внутрь, тяжело рухнул на лестницу.

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3 Response
1. Clelia D.

parameters of a 3-φ transformer bank using short circuit and open circuit tests and to b) Connect the three phases of the low voltage windings to test table 2.

2. Judy M.

The purpose of a short-circuit test is to determine the series branch parameters of the equivalent circuit of a transformer.

3. Abigail F.

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