How to determine the compensation capacity
Answer: Considering the power class load, it is estimated that the power factor of the distribution transformer is around 0.75, and the power factor is designed to increase to 0.90 at full load. Assuming that the distribution capacity is S, the active power, reactive power and power factor angles before compensation are P1, Q1, and φ1, respectively. After compensation, the active power, reactive power, and power factor angle are P2, Q2, and φ2, respectively. Qb is The capacity to be compensated.
From this, it can be concluded that the capacity to be compensated is: Qb=Q1-Q2=S×sinφ1-S×sinφ2=S×(0.661-0.436)=0.225S The compensation percentage is: η%=Qb/S×100%=22.5 % According to the operating experience of the grid, the compensation capacity is generally 20% to 30% of the rated capacity of the transformer.
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