###### Asked in Electrical Engineering

Electrical Engineering

# What is transformer turns ratio excitation current?

012

## Answer

###### Wiki User

###### 11/20/2014

The transformer turns ratio meters is used to measure the excitation current. The excitation current is a magnetic field that is created from electric currents.

## Related Questions

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### What reference to a transformer the current times the number of turns is called the?

Transformer turns ratio

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###### Asked in Electronics Engineering, Internet, Electrical Engineering

### How do you calculate turns ratio for current transformer?

The turns ratio is the number of primary turns divided by the
number of secondary turns. This is the same ratio as input current
to output current. ie the turns ratio N = I1/I2
...

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###### Asked in Electronics Engineering, Electrical Engineering

### How do you calculate current on the primary side of a transformer?

If it's a step up or step down transformer and you know the
secondary side current, multiply the secondary current by the turns
ratio. If you know the power in the secondary winding but not the
current, divide the secondary power by the secondary voltage to get
the secondary current and then multiply the secondary current by
the turns ratio to get the primary current. The turns ratio is the
number of turns on the secondary winding divided by the number...

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###### Asked in Electrical Engineering

### What is current ratio on a transformer?

It's approximately the inverse of the voltage- or
turns-ratio:

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###### Asked in Home Electricity, Electronics Engineering, Electrical Engineering

### In transformer how can you increase or decrease the voltage?

By changing the turns ratio of the transformer. a higher turns
ratio will cause a greater increase in voltage / decrease in
current.
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###### Asked in Consumer Electronics, Electronics Engineering, Electrical Engineering

### How do you calculate current on the primary side of a transformer only knowing the turns ratio and the voltage ratio?

The primary current on a loaded transformer depends on the
secondary current, which is determined by the load. So, if you know
the secondary load current, then you can use the turns ratio of the
transformer to determine the primary current:
Ip/Is = Ns/Np
...

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###### Asked in Home Electricity, Electronics Engineering, Electrical Engineering

### What is mean by 2is to 3 turns ratio Transformer what is primary turns and secondary turns?

with an ideal electrical transformer with an input current of 2
amps and an output current of 1 amp what is the turns ratio of the
secondary and primary coils
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###### Asked in Electrical Engineering

### What are the Causes of phase angle error and ratio error at Current Transformers?

The ratio error is caused just because of making mistakes in the
number of turns of the transformer. The under test transformer is
compared with the standard transformer using an Instrument
Transformer Test Set and the ratio error of the under test
transformer is calculated. The ratio error is then corrected by
inserting more turns or removing turns from the current
transformer.
...

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###### Asked in Definitions

### What is the definition of transformation ratio?

The turns ratio of a transformer is the number of primary turns
to secondary turns. This defines how the transformer will change
the voltage and current. For N1 primary turns, and N2 secondary
turns, N1/N2 will be the turns ratio; the secondary voltage will
be:
the primary voltage x (N2/N1); The secondary current will be:
primary current x (N1/N2)
...

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###### Asked in Electronics Engineering, Electrical Engineering

### How do you calculate the transformer turns ratio?

For an ideal transformer, the turns ratio will be the same as
the voltage ratio.
...

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###### Asked in Science, Electrical Engineering

### When your looking for voltage and current in a step up transformer what do you do?

A 'step-up' transformer's secondary voltage is higher than the
primary voltage. This 'voltage ratio' is (for an 'ideal'
transformer) the same as its 'turns ratio'. The secondary current
is determined by the load, which then determines the primary
current -the current ratio being equal to the inverse of the turns
ratio.
...

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###### Asked in Electronics Engineering, Electrical Engineering, Electrical Wiring

### Could you provide me with the inside diagram of a current transformer?

A current transformer is just a transformer designed to
dutifully give an output related to turns ratio 1:xx.
...

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###### Asked in Mechanical Engineering, Electrical Engineering

### Why primary current is higher than secondary current in transformer with turns ratio 1?

In a transformer with a turns ratio equal to 1, the primary
current comprises the reflected secondary current plus the
magnetizing current necessary to sustain the "back EMF developed
across the mutual inductance coupling the primary winding to the
secondary. Therefore the primary current is always greater than the
secondary current in a transformer with a turns ratio equal to 1.
This should be evident by applying Kirchhoff's Current Law to the
central node of the "T-equivalent" model of a transformer.
...

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###### Asked in Electronics Engineering, Electrical Engineering

### What are the reasons for conducting transformer turns ratio?

The reason for conducting transormer turns ratio is to determine
if the transformer is a step-up or step-down.
Answer
To determine the turns ratio if the turns ratio is unknown.
...

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###### Asked in Heating Ventilating and Air Conditioning, Home Electricity, Electrical Engineering

### Does a transformer increase amps?

The primary current is determined by the secondary current, not
the other way around. For example, a step up transformer will step
up the primary voltage in proportion to the turns ratio of the
transformer. Any secondary current is then determined by the
secondary voltage and the load, NOT by the primary current. The
primary current is then determined by the secondary current in
proportion to the reciprocal of the turns ratio.
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###### Asked in Consumer Electronics, Inventions, Electronics Engineering, DIY Projects

### What determines the transformer ratio?

Transformer ratio, more correctly turns ratio, is the number of
turns in the primary winding divided by the number of turns in the
secondary winding.
...

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###### Asked in Electrical Engineering

### Is current equal in step up and step down transformer?

No. Available step current is inversely proportional to
available step voltage.
For example, if you have a turns ratio of 10:1 for a typical
step-down transformer running off of 120 VAC, producing 12 VAC; if
the input current were 1 ampere, the output current would be 10
amperes. Similarly, for a step up transformer, available voltage
goes up while available current goes down, all within the turns
ratio.
Nope.
The current will be equal if the turns ratio is 1:1 in an ideal
transformer. But,...

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###### Asked in Home Electricity, Electrical Engineering

### Does the formula used to calculate the turns ratio uses the phase voltages and phase current?

For a transformer, the turns ratio always applies between its
primary and secondary windings. So the turns ratio for a
three-phase transformer is the ratio of primary to secondary phase
voltages, not between line voltages.
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###### Asked in Electrical Engineering, Internet

### How differential protection work in a transformer?

Power flowing into a transformer must match the power flowing
out (minus losses which are minimal). If this is not the case,
there's something wrong.
Differential protection monitors current only; Current flowing
into one side of the transformer will be equal to current flowing
out the other side scaled by the turns ratio of the transformer.
Since the turns ratio is equivalent to the voltage ratio, this is
easily set.
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###### Asked in Electrical Engineering

### How do you calculate transformer voltage ratio?

For an ideal transformer, the voltage ratio is the same as its
turns ratio.
...

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###### Asked in Home Electricity, Electronics Engineering, Electrical Engineering

### How do you determine transformer turns ratio if the supply source and load is given?

Transformer turns ratio is the ratio of voltages between two
windings. For instance, a 24VAC control transformer that runs on
120VAC will have a turns ratio about 5 to 1.
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###### Asked in Electrical Engineering, Ratios (mathematical)

### How do you calculate voltage ratio of Transformer?

Count the turns ratio of the windings. The voltage ratio is
equal to the turns ratio. The current ratio is equal to the inverse
of the turns ratio.
For instance, a power transformer with a 10:1 turn ratio
(primary to secondary) running on 120V will produce 12V. If it
consumes 1 ampere from the input, it will provide 10 amperes to the
output.
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###### Asked in Electronics Engineering, Electrical Engineering

### A transformer with a primary of 1200 turns and a secondary of 400 turns has what ratio?

A transformer primary of 1200 turns with a secondary of 400
turns is a ratio of 3 to 1.
...

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###### Asked in Home Electricity, Electrical Engineering

### What is voltage ratio of a single phase transformer?

The voltage ratio is equal to the turns ratio for an ideal
transformer.

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### If the number of turns in the primary side of the transformer is 200 and the number of turns in the secondary coil is 100 what is the ratio?

If the number of turns in the primary side of the transformer is
200 and the number of turns in the secondary coil is 100, the turns
ratio is 200 to 100, or 2 to 1. This application would be a
step-down transformer, reducing voltage by one half and doubling
current.
...

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