Data of busbar 1 to busbar 4 are given in Table 1. Relay Maximum Fault Current...
Data of busbar 1 to busbar 4 are given in Table 1.
| Relay | Maximum Fault | Current Transformer Primary & Secondary |
| R1 | 1000 Amp | 100/5 Amp |
| R2 | 2000 Amp | 200/5 Amp |
| R3 | 4000 Amp | 400/5 Amp |
Calculate the Relay Operating Time (ROT) of all relays. Relay R3 is having two setting of ROT.
Homework Answers
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Data of busbar 1 to busbar 4 are given in Table 1.
Relay
Maximum Fault
Current...
Q: Table I and Equation (1) show IDMT characteristics of three Relays R1, R2 and R3....
Q: Table I and Equation (1) show IDMT characteristics of three Relays R1, R2 and R3. t(1),rip tme =TD( MP -1+ B For M > 1 Table I Characteristics R1 R2 R3 Moderately Inverse 0.0515 0.1140 0.02 19.61 0.4912 Extremely Inverse28.2 0.1217 2 Very Inverse Answer the following questions: (a) Determine the operating time of each relay assuming a 6A pickup setting and a time dial set- ting of 0.6, when the fault current of 60A is measured at each...
A distribution board distributes energy to various items of plant via an installation which has a...
Step by step precise and concise full solution please
A distribution board distributes energy to various items of plant via an installation which has a high voltage (H.V.) panel, a low voltage (L.V) panel and a transformer. The details are as follows: The H.V. panel obtains a 3-phase supply at 11 kV. The transformer circuit-breaker is equipped with 75/5A current transformers which feed a very inverse 3-poles overcurrent relay of 5-A rating. The transformer has a rating of 1000 kVA...
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...
4. (a) What is meant by time grading in protective systems? (b) In FIGURE 1, time graded relays control the circuit breakers. Which will have the shortest delay in operating for a fault at the locatio...
4.
(a) What is meant by time grading in protective systems?
(b) In FIGURE 1, time graded relays control the circuit
breakers. Which
will have the shortest delay in operating for a fault at the
location
shown?
(c) A voltage transformer for use on an 11 kV system has a
star
connected primary. If the turns ratio is 100/1 what will be
the
residual voltage of the open delta winding?
(d) A 1 A electromagnetic relay has 80 turns on...
2. Review your observations the fault from this list: of Vout for each fault in Table C1. For eac...
2. Review your observations the fault from this list: of Vout for each fault in Table C1. For each fault, select the best "Cause" of 3 marks . voltage reference lost feedback path broken between Vout and pass transistor . unfiltered rectifier . pass transistor biasing altered Table C1 on よっ C1 open R1 open Dちopen (remove Q2) 9.53 PART A Series-Pass Zener-Follower Regulator Operation D1-D4 4x 1N4006 01 R6 レ/TIP29 E-3 33R Variac R1 2k2 R3 3k3 C1 470...
. Q2-Fill in the blanks by correct words/figures. Answer only 7 point (1) An overcurrent relay...
. Q2-Fill in the blanks by correct words/figures. Answer only 7 point (1) An overcurrent relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/5. The pick-up value will be ............... (2) The pick-up value of a relay is 7.5 A and fault current in relay coil is 30A. Its plug-setting multiplier is .......... • (3) Back-up protection functions when ...... (4) The minimum relay coil current at which the...
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...
Data and Calculations Table 1.1 Number of Turns Primary Coil Secondary Coil Input VOutput ore 400...
Data and Calculations Table 1.1 Number of Turns Primary Coil Secondary Coil Input VOutput ore 400 400 400 400 400 bur on' dup Table 1.9 Core Configuration: V snaprd wf lour Number of Turns Primary Coil Secondary Coil Output V Core Input V 200 400 800 400 400 400 0 Analysis and Calculation: Part I: Properties of Transformer 1. Which core configuration gives the maximum transfer of electromagnetic effect to the secondary coil? Develop a theory to explain the differences...
5- What is meant by each of the PSM, Slu nuip Question 2-(5 Marks TSMS For...
5- What is meant by each of the PSM, Slu nuip Question 2-(5 Marks TSMS For the given redial system, calculate the-Ru Required CTs ratio of the system to achieve the relay coordination and the time multiplier E Thre-phase io ZgBe Bus B Bus C CT ns setting of each relay. Rp is to protect section ,ey aby層 BC while RA is its back-up and primary protect section AB. Draw the variation oftheI maximum fault current against the fault locations....
Bus A Bus B R1 TI ine 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which ...
Bus A Bus B R1 TI ine 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which is 20% of the total line 2 length from Bus B Fault MVA 1524.20471 Three-phase fault level in MVA at bus A SPFL (kA) 8 MVA1 MVA2 X1 (96 X2 (96) R1 (2) R2 (Q) z' (Q) Zo (2) Rf (Q) Single phase to ground fault level (kA) at bus A Transformer 1 MVA...
Q: Table I and Equation (1) show IDMT characteristics of three Relays R1, R2 and R3. t(1),rip tme =TD( MP -1+ B For M > 1 Table I Characteristics R1 R2 R3 Moderately Inverse 0.0515 0.1140 0.02 19.61 0.4912 Extremely Inverse28.2 0.1217 2 Very Inverse Answer the following questions: (a) Determine the operating time of each relay assuming a 6A pickup setting and a time dial set- ting of 0.6, when the fault current of 60A is measured at each...
Step by step precise and concise full solution please
A distribution board distributes energy to various items of plant via an installation which has a high voltage (H.V.) panel, a low voltage (L.V) panel and a transformer. The details are as follows: The H.V. panel obtains a 3-phase supply at 11 kV. The transformer circuit-breaker is equipped with 75/5A current transformers which feed a very inverse 3-poles overcurrent relay of 5-A rating. The transformer has a rating of 1000 kVA...
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...
4.
(a) What is meant by time grading in protective systems?
(b) In FIGURE 1, time graded relays control the circuit
breakers. Which
will have the shortest delay in operating for a fault at the
location
shown?
(c) A voltage transformer for use on an 11 kV system has a
star
connected primary. If the turns ratio is 100/1 what will be
the
residual voltage of the open delta winding?
(d) A 1 A electromagnetic relay has 80 turns on...
2. Review your observations the fault from this list: of Vout for each fault in Table C1. For each fault, select the best "Cause" of 3 marks . voltage reference lost feedback path broken between Vout and pass transistor . unfiltered rectifier . pass transistor biasing altered Table C1 on よっ C1 open R1 open Dちopen (remove Q2) 9.53 PART A Series-Pass Zener-Follower Regulator Operation D1-D4 4x 1N4006 01 R6 レ/TIP29 E-3 33R Variac R1 2k2 R3 3k3 C1 470...
. Q2-Fill in the blanks by correct words/figures. Answer only 7 point (1) An overcurrent relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/5. The pick-up value will be ............... (2) The pick-up value of a relay is 7.5 A and fault current in relay coil is 30A. Its plug-setting multiplier is .......... • (3) Back-up protection functions when ...... (4) The minimum relay coil current at which the...
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...
Data and Calculations Table 1.1 Number of Turns Primary Coil Secondary Coil Input VOutput ore 400 400 400 400 400 bur on' dup Table 1.9 Core Configuration: V snaprd wf lour Number of Turns Primary Coil Secondary Coil Output V Core Input V 200 400 800 400 400 400 0 Analysis and Calculation: Part I: Properties of Transformer 1. Which core configuration gives the maximum transfer of electromagnetic effect to the secondary coil? Develop a theory to explain the differences...
5- What is meant by each of the PSM, Slu nuip Question 2-(5 Marks TSMS For the given redial system, calculate the-Ru Required CTs ratio of the system to achieve the relay coordination and the time multiplier E Thre-phase io ZgBe Bus B Bus C CT ns setting of each relay. Rp is to protect section ,ey aby層 BC while RA is its back-up and primary protect section AB. Draw the variation oftheI maximum fault current against the fault locations....
Bus A Bus B R1 TI ine 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which is 20% of the total line 2 length from Bus B Fault MVA 1524.20471 Three-phase fault level in MVA at bus A SPFL (kA) 8 MVA1 MVA2 X1 (96 X2 (96) R1 (2) R2 (Q) z' (Q) Zo (2) Rf (Q) Single phase to ground fault level (kA) at bus A Transformer 1 MVA...
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