Homework Answers
For primary always move to end of line
In a radial system like this the primary back up pairs are always in a line as in this case
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Power System Protection (EE476) Q5a) Identify the primary and backup relay pairs in the following...
13of 13 ing EE 476 Q8b) How under frequency relay can help to protect the power system. Explain t...
13of 13 ing EE 476 Q8b) How under frequency relay can help to protect the power system. Explain the answer with the help of a case scenario? SLO e, 2.5 Points Utility Side open ■ ↓ Power (0) regdency Reley R Local Loed 50 Feeder LoadsCaptrve Power 100 MW50 MWGeneretor (100 MW) Loss of Uhility and of Coptive ns:
13of 13 ing EE 476 Q8b) How under frequency relay can help to protect the power system. Explain the answer with...
Problem (5): Design the power and relay control circuit to start DC motor as following: 1)...
Problem (5): Design the power and relay control circuit to start DC motor as following: 1) Start by pressing start pushbutton and stop by pressing stop pushbutton. Start work with inserting resistance Rland (2 R2. After five seconds from starting we put Ri out of function and after 10 seconds from .starting we put R2 out of function
select one Best match 11) A 12 kV radial system is given below, Assuming using relay...
select one Best match
11) A 12 kV radial system is given below, Assuming using relay CO-7, 3 cycles breaker operation time and 0.5 second coordination time delay, what are the best settings to protect the system shown below: (10 points) 12 kV Typical time curves ype Co-7 C.T.R-400/5 C.T.R-200/5 Current tap settings: 4.5,6,78,10,12 amperes 4 MVA Isc-1.6 kA 4 MVA Isc-1.2 kA Time dial TS1 TDS1 TS2 TDS2 A) 51/252 B) 41/24 C) 51/25 D) 41/24 2 4 5...
18. The primary conductor in Figure 10.2 is one phase of a three-phase trans- mission line operat...
18. The primary conductor in Figure 10.2 is one phase of a three-phase trans- mission line operating at 345 kV, 700 MVA, 0.95 power factor lagging. The CT ratio is 1200:5, and the VT ratio is 3000:1. Determine the CT second- ary current and the VT secondary voltage V. Assume zero CT error. A CO-8 relay with a current tap setting of 5 amperes is used with the 100:5 CT in Example 10.1. The CT secondary current I' is the...
Identify features of involute gear tooth nomenclature 1) Identify features of involute gear tooth nomenclature. 15...
Identify features of involute gear tooth nomenclature
1) Identify features of involute gear tooth nomenclature. 15 12 13 14 16 10 9) 10) 2) 3) 4) 12) 13) 14) 15) 16) 7) 8)
1. Given the following data: years 0-9 10-19 20-29 frequency 4 6 8 a. Identify lower...
1. Given the following data: years 0-9 10-19 20-29 frequency 4 6 8 a. Identify lower class limits b. Identify upper class limits c. Identify the class boundaries 2. Given the following data: Cigarette CO (mg) Frequency 2-6 7-11 2 12-16 6 17-21 8 a. Identify the class width b. Identify the class midpoints c. Does the frequency distribution appear to have a normal distribution? 3. Histogram Cigarette Tar Frequency Table Tar (mg) Freq. 2-5 6-9 2 10-13 6 14-17...
Part B (20 marks) Figure 2 shows a three phase 22kV, 50Hz radial system, which is to be protected by two inverse- time...
Part B (20 marks) Figure 2 shows a three phase 22kV, 50Hz radial system, which is to be protected by two inverse- time over-current relays B1 and B2. The maximum loads for this system are L 6 MVA, and L2- 5 MVA. The maximum fault currents at bus 1 and bus 2 are 1500A and 1000A respectively. The minimum fault currents at bus 1 and bus 2 are 900A and 650A respectively The line currents are measured using current transformers...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the...
Given: 100kVA single phase transformer, Z=1.5% Primary: 480V 2 wire Secondary: 120/240V 3 wire Install the above transformer to serve a branch circuit panelboard. The panelboard will be located 10' from the transformer. The primary side raceway is PVC and the secondary raceway is EMT. All calculations will conform to applicable NEC regulations. The primary side, overcurrent protection device, will be chosen based on the next available standard size of the full load amps of the transformer. The secondary side,...
Use power base of 100MVA to change to per unit Consider the transmission system in figure...
Use power base of 100MVA to change to per unit
Consider the transmission system in figure 1 below Gen 1 Тx 2 Line 1 Gen 2 Tx3 Line 4 Line 3 R F Tx 1 Gen 3 Line 2 Figure 1 Impedance and winding details are:- Generators: Gen 1 132kV, Z=0+j12.5% on 25MVA Gen 2 132kV, Z= 0+j12.5% on 25 MVA 20KV, Z 0+j10% on 25 MVA A- connected windings Gen 3 Transformers Earthed Y windings (both sides) Earthed Y...
0.5 points QUESTION 44 5. 2. 3. Front view Correctly label the female reproductive system: 1....
0.5 points QUESTION 44 5. 2. 3. Front view Correctly label the female reproductive system: 1. 2. 3. 4. and 5,. 2.5 points QUESTION 45 7. 15. 14 8. 13. 9 12. 10. 11 Side view Correctly label the female reproductive system: 6. 7. 8 9, 10, 11, 12. 13, 14. 15. NOTE: #8, 10, and 12 are not part of the reproductive system 5 points QUESTION 46 2. 11 10. 9. S1de view 7. Correctly label the male reproductive...
13of 13 ing EE 476 Q8b) How under frequency relay can help to protect the power system. Explain the answer with the help of a case scenario? SLO e, 2.5 Points Utility Side open ■ ↓ Power (0) regdency Reley R Local Loed 50 Feeder LoadsCaptrve Power 100 MW50 MWGeneretor (100 MW) Loss of Uhility and of Coptive ns:
13of 13 ing EE 476 Q8b) How under frequency relay can help to protect the power system. Explain the answer with...
Problem (5): Design the power and relay control circuit to start DC motor as following: 1) Start by pressing start pushbutton and stop by pressing stop pushbutton. Start work with inserting resistance Rland (2 R2. After five seconds from starting we put Ri out of function and after 10 seconds from .starting we put R2 out of function
select one Best match
11) A 12 kV radial system is given below, Assuming using relay CO-7, 3 cycles breaker operation time and 0.5 second coordination time delay, what are the best settings to protect the system shown below: (10 points) 12 kV Typical time curves ype Co-7 C.T.R-400/5 C.T.R-200/5 Current tap settings: 4.5,6,78,10,12 amperes 4 MVA Isc-1.6 kA 4 MVA Isc-1.2 kA Time dial TS1 TDS1 TS2 TDS2 A) 51/252 B) 41/24 C) 51/25 D) 41/24 2 4 5...
18. The primary conductor in Figure 10.2 is one phase of a three-phase trans- mission line operating at 345 kV, 700 MVA, 0.95 power factor lagging. The CT ratio is 1200:5, and the VT ratio is 3000:1. Determine the CT second- ary current and the VT secondary voltage V. Assume zero CT error. A CO-8 relay with a current tap setting of 5 amperes is used with the 100:5 CT in Example 10.1. The CT secondary current I' is the...
Identify features of involute gear tooth nomenclature
1) Identify features of involute gear tooth nomenclature. 15 12 13 14 16 10 9) 10) 2) 3) 4) 12) 13) 14) 15) 16) 7) 8)
1. Given the following data: years 0-9 10-19 20-29 frequency 4 6 8 a. Identify lower class limits b. Identify upper class limits c. Identify the class boundaries 2. Given the following data: Cigarette CO (mg) Frequency 2-6 7-11 2 12-16 6 17-21 8 a. Identify the class width b. Identify the class midpoints c. Does the frequency distribution appear to have a normal distribution? 3. Histogram Cigarette Tar Frequency Table Tar (mg) Freq. 2-5 6-9 2 10-13 6 14-17...
Part B (20 marks) Figure 2 shows a three phase 22kV, 50Hz radial system, which is to be protected by two inverse- time over-current relays B1 and B2. The maximum loads for this system are L 6 MVA, and L2- 5 MVA. The maximum fault currents at bus 1 and bus 2 are 1500A and 1000A respectively. The minimum fault currents at bus 1 and bus 2 are 900A and 650A respectively The line currents are measured using current transformers...
Use power base of 100MVA to change to per unit
Consider the transmission system in figure 1 below Gen 1 Тx 2 Line 1 Gen 2 Tx3 Line 4 Line 3 R F Tx 1 Gen 3 Line 2 Figure 1 Impedance and winding details are:- Generators: Gen 1 132kV, Z=0+j12.5% on 25MVA Gen 2 132kV, Z= 0+j12.5% on 25 MVA 20KV, Z 0+j10% on 25 MVA A- connected windings Gen 3 Transformers Earthed Y windings (both sides) Earthed Y...
0.5 points QUESTION 44 5. 2. 3. Front view Correctly label the female reproductive system: 1. 2. 3. 4. and 5,. 2.5 points QUESTION 45 7. 15. 14 8. 13. 9 12. 10. 11 Side view Correctly label the female reproductive system: 6. 7. 8 9, 10, 11, 12. 13, 14. 15. NOTE: #8, 10, and 12 are not part of the reproductive system 5 points QUESTION 46 2. 11 10. 9. S1de view 7. Correctly label the male reproductive...
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