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Turns Ratio = (Primary turns / Secondary turns) To calculate the turns ratio you have to actually know the number of turns or wraps on the primary and secondary coils. Nobody knows that usually the manufacture of the transformer doesn't even know. So what you can use as and equivalent is to calculate the voltage ratio. So what you typically need to look for is the Input voltage and divid it by the output volatge. Usually that would be as follows; (Primary Voltage/Secondary Voltage) = Voltage Ratio

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โˆ™ 2009-06-05 19:21:03
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Q: How do you calculate transformer turns ratio given primary and secondary winding voltage?
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How do you calculate transformer voltage ratio test?

Secondary voltage / primary voltage


How do you calculate three phase transformer turns ratio?

By determining the transformer's primary and secondary phase voltages. The ratio of the primary phase voltage to the secondary phase voltage will be practically the same as its turns ratio.For example, in the case of a delta/star connected transformer, the primary phase voltage will be its primary line-to-line voltage; it's secondary phase voltage will be its secondary line-to-neutral voltage.


What is current voltage transformer?

A current transformer is a transformer that takes a ratio of primary current, and delivers this ratio to the secondary. The voltage across the primary will be insignificant, and the voltage across the secondary is dependent upon the resistive burden put across it (since the current is a constant ratio of the primary current). A voltage transformer is a transformer that takes a ratio of primary voltage and steps this down to a specific secondary voltage. Primary current is typically very small and secondary voltage is typically very small. A power transformer is a voltage transformer that is designed for "large" primary and secondary currents.


A transformer has 20 primary windings and 100 secondary windings If the secondary voltage is 25 V find the primary voltage?

Voltage on primary/Primary turns = Voltage on secondary/Secondary turns


How does the current in the secondary of a transformer compare with the current in the primary when the secondary voltage is twice the primary voltage?

The current in the secondary when the voltage is twice the primary, will be one half the primary.


What is the difference between step up transformer and step down transformer?

On a step up transformer the primary voltage is lower than the secondary voltage. On a step down transformer the primary voltage is higher than the secondary voltage.


If a transformer has 20 primary windings and 100 secondary windings and the secondary voltage is 25 what is the primary voltage?

Transformer step-up/step-down voltage is turns-ratio, so if a transformer has 20 primary windings and 100 secondary windings (a turns-ratio of 1 to 5) and the secondary voltage is 25, then is the primary voltage is 5.


What is the voltage that is provided by transformer called?

Primary voltage in, secondary voltage out.


A transformer has 200 primary windings and 20 secondary windings If the primary voltage is 10 V find the secondary voltage How do you get the secondary voltage?

You establish what the ratio of the transformer is and then apply the ratio in the same proportions to the voltage.


What is the difference between stepdown and stepup transformers?

A step-down transformer produces a secondary voltage that is lower than its primary voltage, while a step-up transformer produces a secondary voltage that is higher than its primary voltage. The primary voltage is the voltage applied to the transformer, whereas the secondary voltage is the voltage supplied by the transformer. It's the transformer's turns ratio that determines whether it is a step down or step up transformer: i.e. the ratio between the primary and secondary windings. If there are less turns on the secondary winding, then it's a step down transformer; if there are more turns on the secondary winding, then it's a step-up transformer.


Why do you use two windings in single phase?

Any transformer uses a minimum of two windings to change the voltage value. The primary side of the transformer is usually connected to the existing voltage. The secondary side of the transformer is usually connected to the load, who's voltage could be higher or lower voltage than the primary voltage.If the secondary voltage is increased the transformer is known as a step up transformer and if the secondary voltage is decreased the transformer is known as a step down transformer.The transformer terminal markings for the primary are H1 and H2 on a single coil primary and H1 to H4 on a dual voltage primary winding. Like wise the secondary terminal markings are X1 and X2 on a single coil secondary and X1 to X4 on a dual voltage secondary winding.


How many turns on secondary side of transformer with comparison to the primary side?

It depends on the type of transformer.If it is a step up transformer the number of turns in secondary side is higher than primary.Stepdown means it will have fewer number of windings on the secondary side turns when compared with the primary side.An isolation transformer has the same number of windings on the primary as the secondary.The ratio of the windings is proportional to the increase or decrease in the secondary voltage. For example, twice the windings doubles the voltage and 1/2 the windings halves the secondary voltage. The isolation transformer is denoted as 1:1 and has the same voltage on the secondary as the primary.The ratio of secondary turns to primary turns is the same as the ratio of secondary voltage to primary voltage.e.g. if the secondary to primary turns ratio is 1/10, then the secondary voltage will be one tenth of the primary voltage.


Why is the primary voltage greater than the secondary one?

In case of a step down transformer the primary voltage is more than secondary voltage, where in step up transformer the primary voltage is less than seconary winding.


How should I calculate this. A single phase transformer is rated at 99kVA The primary voltage is 6.6kV and the secondary voltage is 220V Assume no losses and calculate The full load primary current?

First find the ratio of the transformer. 6600/220 volts. Second find the secondary current, I = W/E, 99000/220. Third divide the secondary current by the transformer ratio. The answer will be the primary current. To check your answer (W (or VA) = V x A) multiply the primary current times the primary voltage and the secondary current times the secondary voltage and they should both equal the transformer's kVA.


What are the output voltage and current of a transformer determined by?

The secondary (output) voltage is determined by the primary voltage and the turns ratio of the transformer. The secondary current is determined by the secondary voltage and the load resistance.


Can infinite voltage be given at transformer primary?

no, infinite voltage can't be given to the primary of the transformer....if the secondary is connected to the load, then over voltage will damage the load, if secondary is open circuited, then the infinite voltage can breakdown the transformer internal insulation,


Can a step-down transformer increase low voltage to high voltage?

if reversed so the secondary is primary and the primary is secondary it becomes a step-up transformer.


How can find the primary turns of the transformer knowing the primary voltage of the transformer?

The ratio of the primary voltage to the secondary voltage is proportional to the ratio of windings. So if the primary voltage is 120 volts and the secondary is 240 volts there are twice as many turns in the secondary.AnswerAs the previous answer says, you can work out the turns ratio of a transformer, but knowing the primary and secondary voltages will not help you determine how many turns are on each winding.


What are step up and step down transformers?

A Step Up Transformer is one whose secondary voltage is greater than its primary voltage. This kind of transformer "steps up" the voltage applied to it.The Step Up transformer is designed to increase the voltage from the primary winding to the secondary winding.A Step-Down transformer is one whose secondary voltage is less than its primary voltage. The step down transformer is designed to reduce the voltage from the primary winding to the secondary winding. This kind of transformer "steps down" the voltage applied to it.The basic equation for stepping up or stepping down the voltageNp/Ns is known as the turns ratio.The induced voltage in the secondary winding (Vs) is in proportion to the primary voltage (Vp) and is given by the ratio of the number of turns in the secondary (Ns) to the number of turns in the primary (Np).I to answer basic transformer questions.


What are the voaltg in isolation transformer?

The function of an isolation transformer is to electrically-isolate the secondary circuit from the primary circuit, without changing the voltage levels. So, its secondary voltage will be the same as the primary voltage.


What relationship exists between primary and secondary voltages and turns?

The relationship between the number of primary and secondary turns of a transformer is the same as the relationship between the primary input voltage and the secondary output voltage: primary turns/secondary turns = primary voltage/secondary voltage


How do you calculate input voltage of a transformer given both side high and low side impedances and also load with power factor?

The input voltage (primary) and output (secondary) of a transformer is determined by the manufacturer. Transformers are bought to accommodate the voltage that is needed on the primary side and to what voltage is needed on the secondary side.


What is the secondary voltage of a transformer with the turn ratio of 5 to1 and primary volts of 200?

The secondary voltage of a transformer with a turns ratio of 5 to 1, and primary voltage of 200 is 40. (5 to 1)


How much is the secondry voltage vs with a primary voltage is vp equals 120v?

As far as a transformer is concerned, the secondary voltage Vs value cannot be determined by the primary voltage Vp alone. For the simplest of calculations the transformer primary-secondary turn ratio must be known. For an ideal transformer ( and practicaly ideal transformers don't exist as there will be various losses in the transformer cores and windings), the simple equation relating secondary voltage to primary voltage would be : Vs/Vp=Ns/Np=Ip/Is where Ns is the number of winding turns in the secondary of the transformer, and Np the primary. Ip is the primary current and Is the secondary.


Is it a step up or a step down a transformer has 20 primary windings and 100 secondary windings the secondary voltage is 25v?

If a transformer has 20 primary windings and 100 secondary windings, it is a step up transformer. If the secondary voltage is 25v, the primary voltage will be 5v, because the turns ratio is 20 to 100, or 1 to 5.