Dry type transformer power
Simply put, short-circuit impedance refers to the resistor generated by electrical short circuits, such as vortices.
(1) The short-circuit impedance of a dry type transformer refers to the equivalent circuit series characteristic impedance Zk=Rk+jXk in the middle of a pair of winding terminals at rated operating frequency and reference temperature. Because its value needs to be determined based on load experiments in addition to calculation, it is habitually referred to as short-circuit fault working voltage or characteristic impedance working voltage.
(2) Short circuit impedance is an important new item in the performance parameters of dry-type transformers, and the error between the measured value and the standard value at the factory is strictly regulated.
The Harm of Short Circuit Impedance Size to the Operation of Dry Type Transformers
The short-circuit impedance of dry-type transformers, also known as characteristic impedance working voltage, is defined in the field of dry-type transformers as follows: when the secondary winding short-circuit fault (stable) of dry-type transformers occurs, the working voltage increased by the rated voltage of the primary winding commodity is called characteristic impedance working voltage Uz. Uz is usually expressed as a percentage of rated current, i.e. uz=(Uz/U1n) * 100%
When dry type transformers operate at full capacity, the amount of short-circuit impedance has a certain harm to the output voltage of the secondary side. The short-circuit impedance is small, the current is small, the short-circuit impedance is large, and the voltage drop is large. When a short circuit fault occurs in the load of a dry type transformer, the short circuit impedance is small, the short circuit capacity is large, and the dry type transformer bears a large electric driving force. The short circuit impedance is high, the short circuit capacity is small, and the electric driving force borne by the dry type transformer is small.
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