The following figure shows the connections of

The following figure shows the connections of Correct Answer Potential transformers

Potential transformer (PT):

• A potential transformer (PT) is an instrument transformer used to transfer the voltage from a higher value to a lower value.
• It is a step-down transformer.
• Its secondary voltage is very low compared to primary 
• It is used in high voltage lines for operating the potential coils of wattmeter, voltmeter, relays, etc.
• Generally secondary of PT is rated for 110 V.
• PT always connected in parallel to the transmission line.
• The nominal ratio is defined as the ratio of rated primary voltage to the rated secondary voltage.

• In PT, if the load increases then both the ratio error and phase angle error increase.