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'CT' is used to designate current Transformers, and 'PT' is used to designate potential transformers. A current transformer provides a ratio of primary current to the secondary. A potential transformer provides a ratio of primary voltage to the secondary. A power transformer (step up or step down) resembles a PT more than a CT.
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Why current transformer is step down transformer?
Current transformers ('CTs') are used in high-voltage systems to allow the currents flowing in these systems to be measured or to operate protective systems. A CT's secondary winding is isolated from the high-voltage system, allowing measurements to be made, or protective devices to operate, safely.Actually, a CT is a 'step up' transformer, because the terms 'step up' and 'step down', refer to voltages, not currents. For this reason, a CT should NEVER be allowed to have its secondary winding open circuited.
What is step up and step down?
Usually refers to a transformer. A step up transformer increases the voltage and a step down decreases the voltage by an amount proportional to the ratio of the windings between Primary and Secondary. A 1:2 ratio is a step up and doubles the voltage. A 2:1 would be a step down and halve the voltage.
What is the name given to the large transformers used in transmission systems to step up and step down?
step up transformer
Which conditions are used in step up transformer?
Transformers, step up or step down, use mutual induction in their operation.
What will happen to frequency of current when voltage is changed using a step up or step down transformer?
Frequency does not change when you use a step-up or step-down transformer. Only current and voltage is changed.
