500KW load should be installed how much transformer?
Install 630kVA transformer barely enough, it is best to install 800kVA transformer. Because the transformer can not be a long time full load operation, the need for a margin of 0.2, but also take into account the power factor. According to the current capacity of the transformer is only 800kVA level. Down is 630kVA of the. According to 630kVA transformer no-load loss of 1200W, can take the load capacity of 620kW, basically meet the needs of the.
According to the power factor of 0.9 and 20% of the margin, you need to be equipped with 500 / 0.9 / 0.8 = 694.4, you can take 750 kVA capacity can be.
If it is with the motor and other load-based, due to power factor and start-up current reasons, at least 900 kVA more appropriate. If the drive of the motor more than 200 kilowatts, start a large current, you need to put a larger margin or the motor using step-down start mode.
Mainly to see what the load, if it is home lighting electricity, according to the 0.9 power factor and 20% of the margin, you need to be equipped with 500 / 0.9 / 0.8 = 694.4, you can take 750 kilovolt capacity can be. (Consider the future expansion of another operator), if it is with the motor and other load-based, due to power factor and start the current reasons, at least 900 kVA more appropriate. If the drive is more than 200 kilowatts, the starting current is very large, you need to put a larger margin or the motor using the buck mode (increase the investment cost).
P = 500KW cosφ = 0.8
Apparent power S = P / cosφ = 500 / 0.8 = 625KVA
You should choose the power of 625KVA transformer. Because there is no 625 series of products, you should choose a capacity of 630 kVA above the transformer.
If it is with the motor and other load-based, due to power factor and start-up current reasons, at least 900 kVA more appropriate. If the drive is more than 200 kilowatts, the starting current is very large, you need to put a larger margin or the motor using the buck mode (increase the investment cost).
