What is meant by polarity of transformer?
Transformer Polarity refers to the relative direction of the induced voltages between the high voltage terminals and the low voltage terminals. Instrument Transformers (PT’s and CT’s) and large substation transformers are Subtractive Polarity, so the H1 and X1 Bushings will be on the same side of the transformer.
Why do we check polarity of transformer?
We do polarity test on parallel transformers to ensure that we connect the same polarity windings and not the opposite ones. If we accidentally connect the opposite polarities of the windings, it will result in a short-circuit and eventually damage the machine.
What do you mean by polarity of a transformer?
Polarity in an AC circuit is constantly changing direction and magnitude. When we talk about the polarity of a transformer, we mean an instantaneous polarity. The high-voltage windings are always referred to as H 1 and H 2 . The low-voltage windings are always referred to as X1 and X2.
What are different polarities of transformer?
The polarity indications for transformers are well established by standards that apply to all types of transformers. There are two varieties of polarity: subtractive and additive . Both follow the same rules. Power and instrument transformers are subtractive, whereas some distribution transformers are additive.
What is the current transformer ratio?
The current ratio can be defined as the ratio of the current flowing through the secondary winding of a transformer to the current flowing through the primary winding of the same transformer. In simple words, we can say that the ratio of the secondary current to the primary current is known as the current ratio.
What is meant by polarity of transformer winding?
Polarity of Transformer Windings If the windings of the two coils of a transformer are wound in the same direction, the applied voltage and the induced voltage will have the same direction in both the windings. In this case, induced voltage waveform in the secondary winding will be in phase with the applied voltage waveform.