Voltage transformers and current transformers are commonly used measurement devices in the power system, they play an important role in the power system for measurement and protection, and can ensure the safe operation of the power grid.
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Current transformers (CT transformers) and voltage transformers (VT transformers) are both instrument transformers crucial for measuring and monitoring electrical power systems. However, they serve distinct purposes. CT transformers measure currents, while VT transformers measurevoltages.
Current transformers operate by encircling a conductor; the current induces a proportional current in the transformer’s secondary winding for measurement. Voltage transformers are connected in parallel with the circuit, stepping down the voltage for measurement. So it is also called potential transformer (PT).
Current transformers enable safe, accurate current measurement, crucial for monitoring and overload protection. Voltage transformers provide similar benefits for voltage, facilitating monitoring and system control. Both are used across medium and high voltage levels.
Current transformers are commonly used in metering, protection relays, and load monitoring in power grids and industry. Voltage transformers are similarly used in metering and protection, particularly in transmission and distribution networks.
These transformers are often integrated with switchgear to enhance protection and monitoring, providing data to protection relays for fault isolation. This integration significantly improves switchgear performance and safety.
These instrument transformers are indispensable for modern power systems, playing vital roles in measurement, protection, and monitoring to ensure grid stability and reliability.
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