What are the main parameters of a transformer?

Rated frequency: The operating frequency specified during the design of a transformer. The core loss of a transformer is closely related to frequency, so it should be designed and used according to the operating frequency. It is denoted by N, with the unit being Hertz (Hz). China stipulates that the rated frequency is 50Hz.

Rated capacity: Refers to the output power of a transformer under operating conditions, expressed in apparent power. It is denoted by SN and measured in KVA or VA.

Rated voltage: Refers to the voltage allowed to be applied to the coils of a transformer, which must not exceed the specified value during operation. It is denoted by UN, with the unit being KV or V. The primary rated voltage is denoted by UN1, and the secondary rated voltage is denoted by UN2.

Rated current: Refers to the current flowing through the outlet terminals of the primary and secondary windings of a transformer under rated capacity and permissible temperature rise conditions. It is denoted by IN, with units of KA or A. The current of the primary winding is denoted by IN1, and the current of the secondary winding is denoted by IUN21.

Rated power: The output power at which a transformer can operate continuously for an extended period without exceeding the specified temperature rise, under the specified frequency and voltage conditions.

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