KUKA robot maintenance tells you the elements of the electrician's formula Electrician's formula (ii)
Given the transformer capacity, the rated current of its voltage grade side is calculated.
Description: applicable to any voltage level.
Formula: capacity divided by voltage is divided by six divided by ten.
Example: apparent current I= apparent power S/1.732*10KV=1000KVA/1.732*10KV= 57.736a
Estimate I = 1000 kva / 10 kv * 6/10 = 60 a
Electrician's formula (3)
Rough method to check the accuracy of low-voltage single-phase watt-hour meter:
Connect a 100 watt bulb, close the switch and time it.
Time and count revolutions at the same time. Record the value of six minutes per revolution.
The meter dial has a number of kilowatt-hour disk revolutions.
The value shrinks by 100 times, roughly equal to the number of records.
Electrician's formula (iv)
Given the capacity of three-phase motor, calculate its rated current.
Formula: capacity divided by kilovolts, quotient factor point 76.
We know three phase 222, kilowatt three point five amperes.
1 kw present 0.22 KV * 0.76 material 1 a
We have a three kilovolt motor, four kilowatts per ampere.
4 kw present 3 kv * 0.76 material 1 a
Note: the formula is applicable to the calculation of rated current of three-phase motor of any voltage grade. When the formula is used, the unit of capacity is kW, the unit of voltage is kV, and the unit of current is A.