unit 15 three-phase salient pole synchronous …...of a three-phase salient pole synchronous...

15-1

UNIT 15

Three-Phase Salient Pole Synchronous Generator

15-2

EXERCISE 15-1 Armature Resistance Measurement

OBJECTIVE

After completing this exercise, you should able to measure the armature resistance of a

three-phase synchronous generator.

EQUIPMENT REQUIRED

Qty Description Cat. No.

1 Three-phase Salient Pole Synchronous Machine EM-3330-3A

1 DC Power Supply Module EM-3310-1A

1 Three-phase Power Supply Module EM-3310-1B

1 Three-pole Current Limit Protection Switch Module EM-3310-2A

1 Digital DCA Meter EM-3310-3A

1 Digital DCV Meter EM-3310-3B

1 Laboratory Table EM-3380-1A

1 Experimental Frame EM-3380-2B

or Experimental Frame EM-3380-2A

1 Connecting Leads Holder EM-3390-1A

1 Connecting Leads Set EM-3390-3A

1 Safety Bridging Plugs Set EM-3390-4A

15-3

Fig. 15-1-1 Circuit diagram for armature resistance measurement

15-4

Fig. 15-1-2 Connection diagram for armature resistance measurement

15-5

PROCEDURE

CAUTION: High voltages are present in this laboratory exercise! Do not make or modify any connections with the power on unless otherwise specified! If any danger occurs, immediately press the red EMERGENCY OFF button on the Three-phase Power Supply Module.

1. Place the Three-phase Salient Pole Synchronous Machine on the Laboratory Table.

Install the required Modules in the Experimental Frame. Construct the circuit in

accordance with the circuit diagram in Fig. 15-1-1 and the connection diagram in Fig.

15-1-2. Have the instructor check your completed circuit. The synchronous

generator operates in wye.

2. On the DC Power Supply Module, set the V.adj knob to the min. position (fully CCW).

3. Sequentially turn on the 3-P Current Limit Protection Switch, Three-phase Power

Supply, and DC Power Supply Modules.

4. Press the START button on DC Power Supply Module. Slowly turn the V.adj knob

and set the voltage E to 8 V. Record the current I displayed by the Digital DCA Meter

in Table 15-1-1. Calculate the armature resistance Ra using the equation Ra = E / 2I.

5. Repeat step 4 for other E settings in Table 15-1-1.

6. Sequentially turn off the DC Power Supply, Three-phase Power Supply, and 3-P

Current Limit Protection Switch Modules.

Table 15-1-1 Measured I and calculated Ra values

E (V) I (A) Calculated Ra (Ω) 8V 10V 14V

15-6

Experimental Results

Table 15-1-1 Measured I and calculated R values (50-Hz power)

E (V) I (A) Calculated Ra (Ω) 8V 0.14 28.57 10V 0.18 27.77 14V 0.25 28

15-7


Table 15-1-1 Measured I and calculated R values (60-Hz power)

E (V) I (A) Calculated Ra (Ω) 8V 0.16 25 10V 0.2 25 14V 0.29 24

15-8

EXERCISE 15-2 No-Load Saturation Characteristic

OBJECTIVE

After completing this exercise, you should able to demonstrate the operating characteristic

of a three-phase salient pole synchronous generator under no-load saturation condition.

EQUIPMENT REQUIRED


1 DC Permanent-magnet Machine EM-3330-1A




1 Synchronous Machine Exciter EM-3310-1C




1 Digital RPM Meter EM-3310-3G

or Magnetic Powder Brake Unit EM-3320-1A

Brake Controller EM-3320-1N

1 Digital Power Analysis Meter EM-3310-3H

or Digital ACA Meter EM-3310-3C

Digital ACV Meter EM-3310-3D





2 Coupling EM-3390-2A

2 Coupling Guard EM-3390-2B

1 Shaft End Guard EM-3390-2C



15-9

Fig. 15-2-1 Circuit diagram for no-load saturation test

15-10

Fig. 15-2-2 Connection diagram for no-load saturation test

15-11

PROCEDURE


1. Place the DC Permanent-magnet Machine, Three-phase Salient Pole Synchronous

Machine, and Digital RPM Meter on the Laboratory Table. Mechanically couple the

DC Permanent-Magnet (PM) Machine to the Three-phase Salient Pole Synchronous

Machine and the Digital RPM Meter using Couplings. Securely lock the Machine

Bases together using the delta screws. Install the Coupling Guards and the Shaft

End Guard.

2. Install the required Modules in the Experimental Frame. Construct the circuit in



generator operates in delta.

Complete this laboratory exercise as quickly as possible to avoid the rise in temperature under load condition.

3. Set the V.adj knob on DC Power Supply Module to the min. position. Set the voltage

control knob on the Synchronous Machine Exciter Module to the 0 position.



5. On the DC Power Supply Module, press the START button and slowly turn the V.adj

knob to increase the motor voltage until the generator rotates at its rated speed.

Maintain the speed through this exercise. Note: The rated speed of the generator

(Three-phase Salient Pole Synchronous Machine) is 1,800 rpm for 60-Hz power (1,500

rpm for 50-Hz power).

6. Turn on the Synchronous Machine Exciter.

15-12

7. On the Synchronous Machine Exciter Module, slowly turn the voltage control knob so

that the field current If (obtained from the Digital DCA Meter) is 0 A. Record the

generator output voltage Eo (obtained from the Digital Power Analysis Meter) and the

speed N (obtained from the Digital RPM Meter) values in Table 15-2-1.

8. Repeat step 7 for other If settings listed in Table 15-2-1.

9. Sequentially turn off the DC Power Supply, Synchronous Machine Exciter,

Three-phase Power Supply, and 3-P Current Limit Protection Switch Modules.

10. Using the results of Table 15-2-1, plot the Eo vs If curve on the graph of Fig. 15-2-3.

Table 15-2-1 Measured values of If, Eo, and N

If (A) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Eo (V) N (rpm) If (A) 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 Eo (V) N (rpm)

0

50

100

150

200

250

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

If (A)

Eo

(V)

Fig. 15-2-3 The Eo vs If curve

15-13



(50-Hz power, generator speed=1500 rpm)

If (A) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Eo (V) 0 24.3 40.9 62.5 84.7 108.1 126.9 141.1N (rpm) 1500 1500 1500 1500 1500 1500 1500 1500 If (A) 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 Eo (V) 158.4 171.9 184.3 194.7 203.2 212.3 217.6 221.6N (rpm) 1500 1500 1500 1500 1500 1500 1500 1500

0

50

100

150

200

250

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

If (A)

Eo(

V)


15-14



(60-Hz power, generator speed=1800 rpm)

If (A) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Eo (V) 0 19.3 40.2 67.3 90 110.5 131 153 N (rpm) 1800 1800 1800 1800 1800 1800 1800 1800 If (A) 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 Eo (V) 170 184.7 198.3 207.7 216.5 225 229.7 234.5N (rpm) 1800 1800 1800 1800 1800 1800 1800 1800

0

50

100

150

200

250

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

If (A)

Eo

(V)


15-15

EXERCISE 15-3 Short-Circuit Characteristic

OBJECTIVE


of a three-phase salient pole synchronous generator under short-circuit condition.

EQUIPMENT REQUIRED

























15-16

Fig. 15-3-1 Circuit diagram for short-circuit test

15-17

Fig. 15-3-2 Connection diagram for short-circuit test

15-18

PROCEDURE CAUTION: High voltages are present in this laboratory exercise! Do not make or modify any connections with the power on unless otherwise specified! If any danger occurs, immediately press the red EMERGENCY OFF button on the Three-phase Power Supply Module.




Machine and the Digital RPM Meter using Couplings. Securely lock the Machine

Bases together using the delta screws. Install the Coupling Guards and the Shaft

End Guard.





3. Set the V.adj knob on the DC Power Supply Module to the min. position. Set the

voltage control knob on the Synchronous Machine Exciter to the 0 position.




knob to increase the motor voltage until the generator rotates at the its rated speed.

Maintain the speed through this exercise. Note: The rated speed of the generator

(Three-phase Salient Pole Synchronous Machine) is 1,800 rpm for 60-Hz power (1,500

rpm for 50-Hz power).


7. Slowly turn the voltage control knob on the Synchronous Machine Exciter Module and

set the field current If (obtained from the Digital DCA Meter) to 0 A. Record the

15-19

generator output current Io (obtained from the Digital Power Analysis Meter) and the

generator speed N (obtained from the Digital RPM Meter) value in Table 15-3-1.

8. Repeat step 7 for other field current If settings listed in Table 15-3-1.

9. Sequentially turn off the DC Power Supply, Synchronous Machine Exciter,

Three-phase Power Supply, and 3-P Current Limit Protection Switch Modules.

10. Using the results of Table 15-3-1, plot the Io vs If curve on the graph of Fig.15-3-3.

Table 15-3-1 Measured values of If, Io, and N

If (A) 0 0.02 0.04 0.06 0.08 0.1 Io (A) N (rpm) If (A) 0.12 0.14 0.16 0.18 0.2 0.22 0.24 Io (A) N (rpm)

0

0.2

0.4

0.6

0.8

1

1.2

0 0.05 0.1 0.15 0.2 0.25 0.3

If (A)

Io (A

)

Fig.15-3-3 The Io vs If curve

15-20



(50-Hz power, generator speed =1500 rpm)

If (A) 0 0.02 0.04 0.06 0.08 0.1 Io (A) 0 0.088 0.158 0.22 0.29 0.392 N (rpm) 1500 1500 1500 1500 1500 1500 If (A) 0.12 0.14 0.16 0.18 0.2 0.22 0.24 Io (A) 0.44 0.523 0.583 0.663 0.745 0.824 0.896 N (rpm) 1500 1500 1500 1500 1500 1500 1500

0

0.2

0.4

0.6

0.8

1

1.2

0 0.05 0.1 0.15 0.2 0.25 0.3

If (A)

Io (V

)


15-21



(60-Hz power, generator speed =1800 rpm)

If (A) 0 0.02 0.04 0.06 0.08 0.1 Io (A) 0 0.11 0.18 0.26 0.34 0.43 N (rpm) 1800 1800 1800 1800 1800 1800 If (A) 0.12 0.14 0.16 0.18 0.2 0.22 0.24 Io (A) 0.5 0.59 0.67 0.77 0.84 0.92 1 N (rpm) 1800 1800 1800 1800 1800 1800 1800

0

0.2

0.4

0.6

0.8

1

1.2

0 0.05 0.1 0.15 0.2 0.25 0.3

If (A)

Io (A

)


15-22

EXERCISE 15-4 Load Characteristic

OBJECTIVE


of a three-phase salient pole synchronous generator under load condition.

EQUIPMENT REQUIRED








1 Resistive Load Module EM-3310-4R

1 Capacitive Load Module EM-3310-4C

1 Inductive Load Module EM-3310-4L

1 Four-pole Switch Module EM-3310-2B









Digital Three-phase Watt Meter EM-3310-3E

Digital Power Factor Meter EM-3310-3F


15-23









15-24

Fig. 15-4-1 Circuit diagram for load characteristic test

15-25

Fig. 15-4-2 Connection diagram for load characteristic test

15-26

PROCEDURE





Machine and the Digital RPM Meter using Couplings. Securely lock Machine Bases

together using delta screws. Install the Coupling Guards and the Shaft End Guard.

2. Construct the circuit in accordance with the circuit diagram in Fig. 15-4-1 and the

connection diagram in Fig. 15-4-2. Have the instructor check your completed circuit.

The synchronous generator operates in delta.



voltage control knob on the Synchronous Machine Exciter Module to the 0 position.

Set the on-off switch on the Four-Pole Switch module to the OFF position. On the

Resistive Load module, set the switches S0 through S4 to ON position.




knob to increase the motor voltage until the motor rotates at its rated speed N=1,800

rpm for 60-Hz power (or 1,500 rpm for 50-Hz power). Maintain this speed through this

exercise.


15-27

7. Slowly turn the voltage control knob on the Synchronous Machine Exciter to set the

generator output voltage EO to 220 V. Record the field current If in the S0-S4=ON

field of Table 15-4-1. Note: The If value must be maintained in this laboratory

exercise.

8. In the laboratory excise, if the rotor of generator is locked by a load, turn off the power immediately. Note: The motor (prime mover) current must not exceed 130% of the rated current. The generator current must not exceed 130% of the rated current, 0.8A x 1.3 = 1.04A.

9. Maintain the speed (N=1,800 rpm) and the field current If obtained in Step 7. On the

Resistive Load module, set the switches for each of the listed positions in Table 15-4-1.

Record the generator output current Io, generator output voltage Eo, generator output

power Po, and power factor cos θ (obtained from the Digital Power Analysis Meter),

and the generator speed N (obtained from the Digital RPM Meter) values in Table

15-4-1. The “shorted” position is that the rotor windings are short-circuited by setting

the on-off switch on the Four-Pole Switch module to ON position.

10. Sequentially turn off the Capacitive Load, Inductive Load, Resistive Load, DC Power

Supply, Synchronous Machine Exciter, Three-phase Power Supply, and 3-P Current

Limit Protection Switch Modules.

11. Repeat Steps 3 through 10 for resistive and inductive loads. On the Resistive Load

and Inductive Load modules, set the switches for each of the listed positions in Table

15-4-2. Record the generator output current Io, generator output voltage Eo,

generator output power Po, and power factor cos θ (obtained from the Digital Power

Analysis Meter), and the generator speed N (obtained from the Digital RPM Meter)

values in Table 15-4-2. The “shorted” position is that the rotor windings are

short-circuited by setting the on-off switch on the Four-Pole Switch module to ON

position.

12. Repeat Steps 3 through 10 for resistive and capacitive loads. On the Resistive Load

and the Capacitive Load modules, set the switches for each of the listed positions in

Table 15-4-3. Record the generator output current Io, generator output voltage Eo,

generator output power Po, and power factor cos θ (obtained from the Digital Power

15-28

Analysis Meter), and the generator speed N (obtained from the Digital RPM Meter)

values in Table 15-4-3. The “shorted” position is that the rotor windings are

short-circuited by setting the on-off switch on the Four-Pole Switch module to ON

position.

13. Using the results of Tables 15-4-1 through 15-4-3, plot the Eo vs Io curves on the graph

of Fig. 15-4-3.

Table 15-4-1 Measured values of If, Io, Eo, Po, N, and cos θ

Switch Positions on Resistive Load Module S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON Shorted

If (A) Io(A) Eo (V) 220 cos θ Po (W) N (rpm)


Switch Positions on Resistive Load and Inductive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON Shorted

If (A) Io(A) Eo (V) 220 cos θ

Po (W) N (rpm)


Switch Positions on Resistive Load and Capacitive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON Shorted

If (A) Io(A) Eo (V) 220

cos θ

Po (W) N (rpm)

15-29

0

50

100

150

200

250

300

0 0.5 1 1.5 2

Io(A)

Eo

(V) R

R-LR-C

Fig. 15-4-3 The Eo vs Io curves

15-30


Table 15-4-1 Measured values of If, Io, Eo, Po, N, and cos θ ( 50-Hz power )

Switch Positions on Resistive Load Module S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.31 Io(A) 0 0.13 0.27 0.41 0.54 0.67 0.78 1.24 Eo (V) 240 233 230 224 220 210 203 0 cos θ 0 1 1 1 1 1 1 －

Po (W) 0 57.7 114.1 164.1 213.3 248.6 281.7 0 N (rpm) 1800 1800 1800 1800 1800 1800 1800 1800


Switch Positions on Resistive Load and Inductive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.43 0.43 0.43 0.43 0.43 0.43 0.43 0.43 Io(A) 0 0.2 0.39 0.56 0.72 0.84 0.93 1.72 Eo (V) 260 250 240 230 220 207 197 0 cos θ 0 0.88 0.85 0.83 0.84 0.83 0.87 －

Po (W) 0 72 133.5 183.9 225.6 250 283.5 0 N (rpm) 1800 1800 1800 1800 1800 1800 1800 1800


Switch Positions on Resistive Load and Capacitive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19 Io(A) 0 0.16 0.34 0.55 0.74 0.9 1.06 0.76 Eo (V) 194 206 213 218 220 215 210 0 cos θ 0 -0.64 -0.6 -0.54 -0.6 -0.6 -0.65 －

Po (W) 0 43.4 98.5 155.8 213.5 264.7 296 0 N (rpm) 1800 1800 1800 1800 1800 1800 1800 1800

15-31

0

50

100

150

200

250

300

0 0.5 1 1.5 2

Io(A)

Eo

(V) R

R-LR-C


15-32



Switch Positions on Resistive Load Module S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.36 0.36 0.36 0.36 0.36 0.36 0.36 0.36 Io(A) 0 0.147 0.288 0.423 0.55 0.669 0.778 1.334 Eo (V) 235.5 232.3 228 225.4 220 213.1 206.6 0 cos θ 0 0.999 0.999 0.999 0.999 1 1 1 Po (W) 0 59 113 166 210 247 278 0 N (rpm) 1500 1500 1500 1500 1500 1500 1500 1500


Switch Positions on Resistive Load and Inductive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.52 0.52 0.52 0.52 0.52 0.52 0.52 0.52 Io(A) 0 0.248 0.474 0.664 0.837 0.966 1.086 1.9 Eo (V) 257.9 244.4 233.5 221.7 212.3 197.7 186.8 0 cos θ 0 0.697 0.692 0.7 0.709 0.713 0.718 0 Po (W) 0 73 132 178 215 235 253 0 N (rpm) 1500 1500 1500 1500 1500 1500 1500 1500


Switch Positions on Resistive Load and Capacitive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON shorted

If (A) 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 Io(A) 0 0.167 0.34 0.536 0.713 0.888 1.025 0.874 Eo (V) 211.1 209.8 213.6 219.6 220 219 212.6 0 cos θ 0 -0.789 -0.788 -0.77 -0.77 -0.775 -0.781 0 Po (W) 0 47 99 158 209 262 294 0 N (rpm) 1500 1500 1500 1500 1500 1500 1500 1500

15-33

0

50

100

150

200

250

300

0 0.5 1 1.5 2

Io(A)

Eo (

V) R

R-LR-C


15-34

EXERCISE 15-5 Excitation Characteristic

OBJECTIVE After completing this exercise, you should be able to demonstrate the excitation

characteristic of a three-phase salient pole synchronous generator.

EQUIPMENT REQUIRED








1 Resistive Load Module EM-3310-4R

1 Capacitive Load Module EM-3310-4C

1 Inductive Load Module EM-3310-4L









Digital Three-phase Watt Meter EM-3310-3E

Digital Power Factor Meter EM-3310-3F




15-35







15-36

Fig. 15-5-1 Circuit diagram for excitation characteristic test

15-37

Fig. 15-5-2 Connection diagram for excitation characteristic test

15-38

PROCEDURE





Machine and the Digital RPM Meter using Couplings. Securely lock Machine Bases

using delta screws. Install the Coupling Guards and the Shaft End Guard.







voltage control knob on the Synchronous Machine Exciter to the 0 position.




knob and set the prime mover to rotate at its rated speed. Maintain the speed through

this exercise. Note: The rated speed of the prime mover (DC Permanent-magnet

Machine) is 1,800 rpm for 60-Hz power (1,500 rpm for 50-Hz power).


7. Slowly turn the voltage control knob on the Synchronous Machine Exciter to increase

15-39

the output voltage up to 220 V. Maintain the output voltage through this exercise.

8. In the laboratory excise, if the rotor of generator is locked by a load, turn off the power immediately. Note: The motor (prime mover) current must not exceed 130% of the rated current. The generator current must not exceed 130% of the rated current (0.8A x 1.3 = 1.04A) and the field current must not exceed 130% of the rated current (0.3A x 1.3 = 0.39A).

9. On the Resistive Load Module, set the switch positions listed in Table 15-5-1. Record

the generator field current If (obtained from the Digital DCA Meter), generator output

current Io, generator output voltage Eo, generator output power Po, power factor cos θ

(obtained from the Digital Power Analysis Meter), and generator speed N (obtained

from the Digital RPM Meter) values in Table 15-5-1.

10. On the Resistive Load and the Inductive Load Modules, set the switch positions listed

in Table 15-5-2. Record the generator field current If (obtained from the Digital DCA

Meter), generator output current Io, generator output voltage Eo, generator output

power Po, power factor cos θ (obtained from the Digital Power Analysis Meter), and

generator speed N (obtained from the Digital RPM Meter) values in Table 15-5-2.

11. On the Resistive Load and the Capacitive Load Modules, set the switch positions listed

in Table 15-5-3. Record the generator field current If (obtained from the Digital DCA

Meter), generator output current Io, generator output voltage Eo, generator output

power Po, power factor cos θ (obtained from the Digital Power Analysis Meter), and

generator speed N (obtained from the Digital RPM Meter) values in Table 15-5-3.

12. Sequentially turn off the Resistive Load, Inductive Load, Capacitive Load, DC Power

Supply, Synchronous Machine Exciter, Three-phase Power Supply, and 3-P Current

Limit Protection Switch Modules.

13. Using the results of Tables 15-5-1 through 15-5-3, plot the If vs Io curves on the graph

of Fig. 15-5-3.

15-40

Table 15-5-1 Measured values of If, Io, Eo, Po, cos θ, and N

Switch Positions on Resistive Load Module S0=OFF S0, S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON

If (A) Io (A) Eo (V) 220 220 220 220 220 220 220 cos θ Po (W) N (rpm)

Table 15-5-2 Measured values of If, Io, Eo, Po, cos θ, and N

Switch Positions on Resistive Load and Inductive Load Modules S0=OFF S0-S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON


Table 15-5-3 Measured the values of If, Io, Eo, Po, cos θ, and N

Switch Positions on Resistive Load and Capacitive Load Modules S0=OFF S0, S1=ON S0-S2=ON S0-S3=ON S0-S4=ON S0-S5=ON S0-S6=ON


15-41

0

0.1

0.2

0.3

0.4

0.5

0.6

0 0.2 0.4 0.6 0.8 1 1.2

Io(A)

If(A

) RR-LR-C

Fig. 15-5-3 The If vs Io curves

15-42


Table 15-5-1 Measured values of If, Io, Eo, Po, cos θ, and N ( 50-Hz power )


If (A) 0.29 0.30 0.32 0.33 0.36 0.39 0.41 Io (A) 0 0.14 0.277 0.414 0.556 0.689 0.829 Eo (V) 220 220 220 220 220 220 220 cos θ 0 1 1 1 1 1 1 Po (W) 0 53 105 157 213 262 315 N (rpm) 1500 1500 1500 1500 1500 1500 1500



If (A) 0.29 0.36 0.44 0.52 Io (A) 0 0.221 0.445 0.658 Eo (V) 220 220 220 220 220 220 220 cos θ 0 0.706 0.7 0.7 Po (W) 0 60 117 176 N (rpm) 1500 1500 1500 1500 1500 1500 1500



If (A) 0.29 0.27 0.25 0.24 0.23 0.24 0.25 Io (A) 0 0.175 0.352 0.538 0.717 0.892 1.062 Eo (V) 220 220 220 220 220 220 220 cos θ 0 -0.789 -0.785 -0.78 -0.77 -0.776 -0.77 Po (W) 0 52 105 159 211 266 316 N (rpm) 1500 1500 1500 1500 1500 1500 1500

15-43

0

0.1

0.2

0.3

0.4

0.5

0.6

0 0.2 0.4 0.6 0.8 1 1.2

Io(A)

If (A

) RR-LR-C


15-44




If (A) 0.25 0.26 0.27 0.29 0.31 0.34 0.36 Io (A) 0 0.12 0.26 0.4 0.55 0.7 0.84 Eo (V) 220 220 220 220 220 220 220 cos θ 0 1 1 1 1 1 1 Po (W) 0 50.8 102.8 156.8 213.5 269.3 329 N (rpm) 1800 1800 1800 1800 1800 1800 1800



If (A) 0.25 0.3 0.34 0.39 0.44 0.49 0.52 Io (A) 0 0.17 0.36 0.54 0.71 0.91 1.08 Eo (V) 220 220 220 220 220 220 220 cos θ 0 0.89 0.85 0.84 0.82 0.84 0.84 Po (W) 0 55.5 112 170.2 225.8 283.4 345 N (rpm) 1800 1800 1800 1800 1800 1800 1800

Table 15-5-3 Measured values of If, Io, Eo, Po, cos θ, and N (60-Hz power )


If (A) 0.25 0.23 0.2 0.2 0.19 0.19 0.21 Io (A) 0 0.17 0.35 0.55 0.74 0.91 1.09 Eo (V) 220 220 220 220 220 220 220 cos θ 0 -0.65 -0.6 -0.6 -0.6 -0.6 -0.76 Po (W) 0 50.9 103 160.3 219 267.7 325.8 N (rpm) 1800 1800 1800 1800 1800 1800 1800

15-45

0

0.1

0.2

0.3

0.4

0.5

0.6

0 0.2 0.4 0.6 0.8 1 1.2

Io(A)

I f(A

) RR-LR-C


unit 15 three-phase salient pole synchronous …...of a three-phase salient pole synchronous...

Documents