Current transformers and voltage transformers function as "detection components" in the circuit.
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It is inconvenient and unsafe to measure large currents and high voltages directly. These two kinds of electrical appliances have been developed as people's "eyes" to monitor the current and voltage of the circuit at any time.
A current transformer is an appliance that converts a current at a high current or a high voltage into a low voltage standard current (5A or 1A);
A voltage transformer is an appliance that converts a high voltage into a standard voltage (100V);
By detecting the current converted by the current transformer, it is known whether there is current flowing in the circuit, the magnitude of the current, and whether it is operating under normal conditions.
By detecting the voltage of the voltage transformer secondary transformation, it is known whether there is voltage in the circuit and whether the voltage is normal. In the protection, the malfunction of the current protection can be "locked", and the sensitivity of the protection device is improved.