Flameproof Motors - Elec.ru

www.weg.net4. General Construction - Electrical Features4.1. Voltage and Frequency4.2. Ambient / Insulation4.1.1. TolerancesIn IEC 60034-1 the combination of voltage and frequency variationsare classified as zone A or zone B, as per figure 4.01.Ambient temperature and altitudeUnless otherwise specified, the rated power outputs shown inthe electrical data tables within this catalogue refer to continuousduty operation S1, as per IEC 60034-1 and under the followingconditions:With ambient temperature range -20°C to +40°CWith altitudes up to 1000 meters above sea levelFor operating temperatures and altitudes differing from those above,the factors indicated in table 4.02 (correction factors for altitude andambient temperature) must be applied to the nominal motor powerrating in order to determine the derated available output (Pmax).Pmax = Pnom × correction factorFigure 4.01 - Rated voltage and frequency limits for electricalmotorsIEC 60034-1 states that the motor must be suitable to perform itsmain function (supply torque) continuously at Zone A. However,this motor may not fully meet its performance characteristics due topower supply voltage and frequency variation, which can result intemperature rise above the rated value.The motor must also be suitable to perform its main function (supplytorque) at Zone B. However, the performance characteristic changeswill be greater than those operating at Zone A. The temperature risewill also be higher than that of rated voltage and frequency and thatoperating at Zone A. Prolonged operation near Zone B boundary isnot recommended.WEG flameproof motors are tested in accordance with EN/IEC60079-0 that imposes a voltage supply of -10% for validation ofenclosure surface temperature.For motors with increased safety terminal box, voltage andtolerances are limited by standard IEC 60079-7. The maximumallowed voltage for Ex e equipment is 10 kV ± 10%.WEG motors with increased safety terminal boxes for voltagesbetween 6300V and 6600V and for voltage higher than 10000Vmust be consulted prior to order.4.1.2. Voltage levelsW22X line standard voltages are indicated in table 4.01:LVMVVoltage Range50 Hz 400V / Y 690V60 Hz 460V50 Hz Y 3.0 kV / Y 6.0 kV60 Hz Y 4.16 kVHV 50 Hz Y 10.0 kVTable 4.01 - W22X standard voltagesTAltitude [m][ºC] 1000 1500 2000 2500 3000 3500 4000 4500 500010 0,97 0,92 0,8815 0,98 0,94 0,90 0,8620 1 0,95 0,91 0,87 0,8325 1 0,95 0,93 0,89 0,85 0,8130 1 0,96 0,92 0,90 0,86 0,82 0,7835 1 0,95 0,93 0,90 0,88 0,84 0,80 0,7540 1 0,97 0,94 0,90 0,86 0,82 0,80 0,76 0,7145 0,95 0,92 0,90 0,88 0,85 0,81 0,78 0,74 0,6950 0,92 0,90 0,87 0,85 0,82 0,80 0,77 0,72 0,6755 0,88 0,85 0,83 0,81 0,78 0,76 0,73 0,70 0,6560 0,83 0,82 0,80 0,77 0,75 0,73 0,70 0,67 0,6265 0,79 0,76 0,74 0,72 0,70 0,68 0,66 0,62 0,5870 0,74 0,71 0,69 0,67 0,66 0,64 0,62 0,58 0,5375 0,70 0,68 0,66 0,64 0,62 0,60 0,58 0,53 0,4980 0,65 0,64 0,62 0,60 0,58 0,56 0,55 0,48 0,44Table 4.02 - Correction factors for altitude and ambientetemperatureUnless otherwise specified, all motors are supplied with Class Finsulation and Class B (80 K) temperature rise at normal operatingconditions.The difference between the temperature rise of the class F insulation(105 K) and the temperature rise of the class B design (80 K) meansthat, in practice, motors are suitable to supply output ratings abovethe rated values up to a limit where the temperature rise reaches thetemperature rise value of the insulation class.The ratio between temperature rise and service factor is given by theequation below:T FINAL≈ (S.F.) 2 x T INITIALUpon service factor calculation, we can see that Service Factor isapproximately 1.15. This reserve of temperature also allows thatmost of the motors with class B temperature rise (80 K) to operatecontinuously at:Up to 15% above its rated output power, considering 40°Cambient temperature and 1.000 m.a.s.l.Up to 55°C ambient temperature, keeping the rated outputpowerUp to 3000 m.a.s.l., keeping the rated output power38 | Flameproof Motors