Current Transformer: Current transformers are used for measuring,control and protection purpose. There current ratio of these transformer is high (e.g. 500A/5A) and voltage . Their location is decided by protective zone measurement requirement.
Voltage Transformer: Basically are of two types
1. Electromagnetic Voltage Transformer.
2. Capacitive Voltage Transformer.
The voltage ratio of these transformer is high. Used for measuring, control and protection purpose The secondary sides of these transformer are connected to protective relays
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