Measuring Transformers (CT and VT)

Measuring transformers allow for the standardization of current and voltage values at the secondary side. They are used in circuits where the current or voltage reaches levels that are not compatible with standard measuring instruments, control relays, and protection systems; they also ensure improved safety conditions for operators. Measuring transformers come in two fundamental types: voltage transformers (VT) and current transformers (CT). Current transformers provide a secondary current that is proportional to the current flowing in the primary. Voltage transformers are typically used to measure line voltage. They are designed to have a very precise ratio between the input voltage to be measured and the output voltage.