What is the voltage change rate of a transformer?
The voltage change rate of voltage regulator is one of the main performance indexes of transformer. When the transformer supplies power to the load, the voltage at the load end of the transformer will inevitably decrease. Compare the decreased voltage value with the rated voltage value, and take the percentage as the voltage change rate, which can be expressed by the formula; Voltage change rate=[(secondary rated voltage load terminal voltage)/secondary rated voltage] × 100%。 Generally, when the power transformer is connected to the rated load, the voltage change rate is 4-6%.
How to ensure that the transformer has a rated voltage output?
If the voltage is too high or too low, the normal operation and service life of the transformer will be affected, so the voltage must be adjusted. The method of voltage regulation is to lead out several taps in the primary coil and connect them to the tapping head, which changes the number of turns of the coil by rotating the contact. As long as the position of the tap changer is turned, the required rated voltage can be obtained. It should be noted that the voltage regulation should normally be carried out after the load connected to the transformer is cut off.