Motor Starting Calculation

Main_Data

MOTOR STARTING Client: Project: Motor: 800 hp Motor Case: Utility Supply & Base Data: Utility Gen. Volts (UGV): 25 Base MVA: 100 Base Pri. Volts: 25 SCMVA: 36.3274 X/R Ratio: 1.4 Base Sec. Volts: 4160

Transformer: kV MVA kV MVA at p.u. V

25

kV

Feeders: MCC 500 1 100

Heating & Lighting Loads: Capacitor on Starter Term. Capacitor on MCC Bus

Motor Starting: Initial Load:

Motor 1 AW G/MCM 1 200 ft

0 k kV VA 750 kV k VA 60 kV kVA

49.9 kVA FV Inrush: 83.15 % Bases: 25 Tap Prim. % %Volts Voltage 10 100. 0.00 00

Across the Line: Auto-Transformer:

80

Reactor: 2.19 Ohms 5.80 mH

65

Short-Circuit: Steady Ste ady-sta -state te RMS from utility system only.

1 25 4160 6 10

MVA kV V % p.u.

800 4160 98.5 750 17 88.5 92 140 95

hp V A %FLC % % % %FLT %F %

Motor:

Conductor Size: #/Phase: Length: Other Loads:

PF Capacitor: Cap. Correct. PF:

Size: Primary Volts Secondary Volts: Impedance: X/R Ratio:

Voltage Flicker Voltage Flicker Voltage Flicker

Based on UGV 25 kV MVA: Current (A): X/R:

109396001.xls.ms_office

90 %P %PF 3300 V 4160 V

Horsepower: Rated Voltage: Full Load Current: Inrush Current: Locked Rotor PF: Full Load PF: Cap. Correct. PF: Starting Torque: Efficiency:

Calculations: 5322.94 kVA Horsepower: 738.75 A Full Load Current: 4160 4160 4160 FLT Sec. M CC Motor Torque %Volts %Volts %Volts % 100. 10 0.00 00 10 100. 0.00 00

800 hp 99 Am Amps

Motor A

M CC kVA

92.31 7 .6 9 94.60 5 .4 0 94.62 5 .3 8

7 4 .2 8

74.22

73.96

71

546

2,247

8 1 .9 7

81.93

65.31

55

482

1,738

8 1 .5 6

81.52

53.66

37

396

1,777

Prim. Bus 36.33 838.9 1.40

Sec. Bus 11.77 1633 3.74

M CC Bus 11.74 1629 3.72

Motor Bus 11.62 1613 3.45

Accel

MOTOR ACCELERATION Client: Project: Motor: 800 hp Motor Case: Input Data: Synchronous Speed (SS): Full Load Torque (FLT): Total Inertia (W K^2): Motor Locked Rotor Torque: Motor Pull-up Torque (PUTQ): Motor Pull-up Torque Speed (max. 75%): Motor Break-down Torque: Load Curve Exponent (0=level, 1=lin., 2=sq.): Load Break-away Torque: Load Rated Speed Torque:

3600 1167 122 150 140 50 220 0.1 2 51

rpm lb.ft. lb.ft^2 %FLT %F %FLT %F %SS %FLT %FLT %FLT

.

Auto-Transformer Start, at 80 % Tap. Motor %Speed

Load %FLT

Motor %FLT

Motor %FLA

Motor %PF

MtrRV %Volts

MtrRV %FLA

MtrRV %FLT

Time Sec.

Pr i . V %Volts

MCC.V %Volts

Ac A ccel.T %FLT

0 10 20 30 40 50 60 70 80 90 95 97.5 99

2.0 20.0 30.0 40.0 45.0 48.0 50.0 50.5 51.0 51.0 51.0 51.0 51.0

150.0 146.4 143.6 141.6 140.4 140.0 141.6 145.1 153.7 183.7 220.0 168.6 100.0

750 745 740 734 729 724 711 688 656 568 480 295 100

17.0 17.6 18.1 18.7 19.2 19.8 20.3 22.5 28.0 39.0 50.0 67.6 88.5

65.3 65.4 65.5 65.6 65.7 65.8 66.1 66.6 67.2 69.3 71.6 77.0 83.3

490 487 485 482 479 477 470 458 441 393 343 227 83

59.2 58.0 57.1 56.4 56.1 56.2 57.3 59.5 64.3 81.6 104.4 92.6 64.2

0. 0 0. 3 0. 6 1. 2 2. 1 3. 4 5. 0 6. 5 7. 6 8. 2 8.4 8. 4 8.5

94.6 94.6 94.6 94.7 94.7 94.7 94.8 94.9 95.1 95.6 96.3 98.2 100.7

81.9 82.1 82.2 82.3 82.4 82.6 82.9 83.5 84.4 87.0 89.9 96.6 104.2

57.2 38.0 27.1 16.4 11.1 8. 2 7. 3 9. 0 13.3 30.6 53.4 41.6 13.2

250.0 200.0 ) T L F 150.0 % ( e u 100.0 q r o T

MTRFVT MtrRVT Load T

50.0 0.0

0.0

2.0

4.0

6.0

8.0

C:\Users\user\Documents\


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10.0

Time (sec.)

Accel

120.0

100.0

80.0 s t l o V e 60.0 s a B %

Pri. V MCC V Motor V

40.0

20.0

0.0 0.0

2.0

4.0

6.0

8.0

10.0 Time (sec.)

Motor Amps (Log-Log) 10.0

> ) . c e s ( e m i T

1.0

0.1

100

1000 Amps (%FLC)


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Miscel.

XLSTAR

MISCELLANEOUS CALCULATIONS System Impedance and Short-Circuit MVA: R1 = X1 = BMVA =

1.6 per unit 2.24 per unit 100 MVA

SCMVA: 36.32739 MVA X/R Ratio: 1.4 Z1: 2.752744 pe p er unit

Pre-start Voltage (%) New SCMVA:

BMVA = 100 MVA SCMVA = 36.32739 MVA X/R Ratio= 1.4

Z1: 2.752744 per unit R1: 1.6 per unit X1: 2.24 pe p er unit

100 36.327

Torque

Torqu Tor que e = hp x 525 5252 2 / rp rpm m ft. ft.lb lb.= .=

800 hp 3600 rpm 1167 11 67.1 .111 111 1 ft. lb.

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Motor Starting Calculation

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