THREE PHASE SYNCRONOUS GENERATOR MJB 250 MA4 4 poles 50 Hz - 1500 rpm / 60 Hz - 1800 rpm CONTINUOUS DUTY AMBIENT TEMPERATURE 40°C TEMPERATURE RISE H INSULATION CLASS H POWER FACTOR 0,8 FREQUENCY VOLTAGE Hz Connections Star series Star parallel RATING POWER EFFICIENCY [%] @ 0,8 p.f. EFFICIENCY [%] @ 1 p.f. SHORT CIRCUIT RATIO REACTANCES [%] Direct axis synchronous Quadrature axis synchronous Direct axis transient Direct axis subtransient Quadrature axis subtransient Negative sequence Zero sequence TIME CONSTANTS [s] Open circuit Transient Subtransient Armature Winding code M0 Number of leads 12 Winding pitch 2/3 WINDING DATA kVA kW 4/4 3/4 2/4 4/4 3/4 2/4 SCR 380 190 165 132 92,5 93,0 93,2 94,0 94,4 94,6 0,42 50 Hz 400 415 200 208 165 165 132 132 92,9 92,8 93,2 93,1 93,1 93,0 94,4 94,3 94,6 94,5 94,5 94,5 0,47 0,51 440 220 165 132 92,7 93,0 92,8 94,2 94,5 94,3 0,57 380 190 170 136 91,7 92,7 93,1 93,4 94,2 94,5 0,34 416 208 175 140 92,2 93,1 93,2 93,8 94,5 94,6 0,40 60 Hz 440 220 185 148 92,4 93,1 93,3 94,0 94,6 94,7 0,42 460 230 195 156 92,6 93,3 93,4 94,1 94,7 94,8 0,44 480 240 205 164 93,6 93,8 93,4 94,9 95,1 94,8 0,45 Xd Xq X'd X''d X''q X2 X0 361 201 31,7 13,3 15,3 14,3 3,0 326 181 28,6 12,0 13,8 12,9 2,8 269 150 23,6 9,9 11,4 10,7 2,3 338 248 39,2 16,4 18,9 17,7 3,8 384 213 33,7 14,1 16,2 15,2 3,2 362 201 31,8 13,3 15,3 14,3 3,1 350 194 30,7 12,9 14,8 13,8 2,9 338 187 29,6 12,4 14,3 13,4 2,8 V T'do T'd T"d Ta 303 168 26,6 11,1 12,8 12,0 2,6 0,95 0,09 0,011 0,012 MECHANICAL CHARACTERISTICS D-end bearing/Lubrication N-end bearing/Lubrication Overspeed [r.p.m.] Inertia (J) [kgm2] Refer to B34 construction Weight [kg] Refer to B34 construction Method of cooling Cooling air required [m3/s] @ 50/60 Hz Degree of protection Types of construction available Direction of rotation (Standard) 6218 2RS C3 / Prelubricated 6313 2Z C3 / Prelubricated 2250 1,41 530 IC01 0,42 / 0,52 IP23 B2 (SAE) - IM B34 CW OTHER DATA Phase resistance @ 20 °C - Star series Overloads 3-phase short circuit sustained current Voltage regulation accuracy Radio interference Wave form THF Total harmonic content 0,032 10% for 1 hour every 12 hours ≥ 300 % (3 In) with auxiliary winding ± 0,5 % In steady state condition EN 55011 - Class B Group 1 < 2% < 2% - At no load STANDARDS IEC 60034-1; CEI 2-3; BS 4999-5000; VDE 0530; NF 51-100,111; OVE M-10, NEMA MG 1.22. SIN.DT.014.6 Data and Technical Specification are subject to change in order to update or improve the products, without prior notice THREE PHASE SYNCRONOUS GENERATOR MJB 250 MA4 Typical efficiency curves 50 Hz - 1500 rpm 380 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 0% 25% 50% 75% 100% 125% Load [%] 400 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 0% 25% 50% 75% 100% 125% Load [%] 415 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 88 0% 25% 50% 75% 100% 125% Load [%] 440 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 88 0% 25% 50% 75% 100% Load [%] Typical efficiency curves SIN.DT.014.6 60 Hz - 1800 rpm Data and Technical Specification are subject to change in order to update or improve the products, without prior notice 125% THREE PHASE SYNCRONOUS GENERATOR MJB 250 MA4 Typical efficiency curves 60 Hz - 1800 rpm 380 V Efficiency [%] 96 94 pf 1 92 90 0% pf 0,8 25% 50% 75% 100% 125% Load [%] 416 V Efficiency [%] 96 94 pf 1 92 pf 0,8 90 0% 25% 50% 75% 100% 125% Load [%] 440 V Efficiency [%] 96 94 pf 1 pf 0,8 92 90 0% 25% 50% 75% 100% 125% Load [%] 460 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 0% 25% 50% 75% 100% 125% Load [%] 480 V Efficiency [%] 96 pf 1 94 pf 0,8 92 90 0% 25% 50% 75% 100% Load [%] SIN.DT.014.6 Data and Technical Specification are subject to change in order to update or improve the products, without prior notice 125% THREE PHASE SYNCRONOUS GENERATOR MJB 250 MA4 Locked rotor motor starting curves (*) 50 Hz - 1500 rpm 380 V 400 V 415 V 440 V 50 45 Voltage Dip [%] 40 35 30 25 20 15 10 5 0 0 50 100 150 200 250 300 350 400 450 400 450 60 Hz - 1800 rpm 380 V 416 V 440 V 460 V 480 V 60 Voltage Dip [%] 50 40 30 20 10 0 0 50 100 150 200 250 300 350 (*): A coefficient of 0,85 must be applied to the voltage dip if the load has a power factor equal or greater than 0,8. SIN.DT.014.6 Data and Technical Specification are subject to change in order to update or improve the products, without prior notice
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