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The ratio between the active power, measured in kW, and the apparent power, measured in kVA, is known as the power factor. The angle between P and S is usually designated ϕ. The power factor is equal to cosϕ. 9. It is lower for small motors and higher for large motors. The power factor is determined by measuring the input power, voltage and current at rated output. The power factor stated is subject to a tolerance of (1-cosϕ)/6 If there are many motors in an installation, a lot of reactive power will be consumed and therefore the power factor will be lower.
5 Uprating Because of the lower temperature rise in the motor in short-time or intermittent duty, it is usually possible to take a higher output from the motor in these types of duty than in continuous duty, S1. The tables below show some examples of this. Short-time duty, S2 Poles Permitted output as % of rated output in S1 continuous duty for motor size: 63-100 112-250 280-400 30 min 2 4-8 105 110 125 130 130 130 60 min 2-8 100 110 115 Intermittent duty, S3 Poles Permitted output as % of rated output in S1 continuous duty for motor size: 63-100 112-250 280-400 15% 2 4 6, 8 115 140 140 145 145 140 140 140 140 25% 2 4 6, 8 110 130 135 130 130 125 130 130 130 40% 2 4 6, 8 110 120 125 110 110 108 120 120 120 60% 2 4 6, 8 105 110 115 107 107 105 110 110 110 65 4.
If a motor is to be operated in higher ambient temperatures, it should normally be derated according to the table below. Please note that when the output power of a standard motor is derated, the relative values in catalogs, such as IS/IN, will change. 3 Starting motors Connection transients It is important to remember that the term starting current refers to the steady-state rms value. This is the value measured when, after a few cycles, the transient phenomena have died out. 5 times the steady-state starting current, but decays rapidly.