Quèstion 4 Protective relays can not prevent the faults in power system True False

Q: c. Current transformers, of turns ratio 1200:1, are used as supply to a differential relay of…

A: Given: Turns ratio=1200:1RL=1.8+2.5RL=4.3ΩSetting current, Is=1.5 AI=80 kARelay resistance,…

Q: A series of 3 load centers are supplied from a single generator. A simple current grading protection…

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Q: Q2) put (v) or (x) for the following and correct the wrong: 1- It is not always a good idea to have…

A: As per the guidelines given, We can only provide the solution of the first three questions in…

Q: Complete the blank   For a 66 kV transmission, the number of  suspension insulators  required is…

A: Each disk of suspension type insulator is designed for  11KV no of insulator disk  n=line…

Q: current for the relay is 0.5 A, Calculate the % of each phase of the stator winding which is…

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Q: 11. What affects the angle of lead? (DC GENERATOR QUESTION)

A: It is asked that whet affects the angle of lead. We have given the explanation by using some…

Q: (iv) The motor being delta connected rather than star connected.

A: (iv) Wehn motor is connected in star connnection then the supply voltage is 3 times than the motor…

Q: A 50 element is set for 0.8 per unit (80%) of the CT primary current rating. For a CT with a rated…

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Q: TRUE or FALSE: During open-circuit test, the current in the high-voltage winding is equal to zero.

A:

Q: In the following power system, overcurrent relay R₁2 is to provide primary protection to line 1-2…

A: A relay is a protective device used for overcurrent protection it consists of a coil and magnet…

Q: в A 1Ω 10Ω 100 V Figure 4.20 System diagram for Problem 4.2a в A 10Ω 1Ω 100 V Figure 4.21 System…

A: Part(a)   Fig: Given circuit diagram When fault occurs at bus A it causes short circuit on the bus…

Q: H BRIDGE USING 2 RELAYS DIAGRAM AND IDENTIFY THE PARTS.

A: H BRIDGE USING 2 RELAYS DIAGRAM AND IDENTIFY THE PARTS.

Q: Distance protection is a unit protection * If was working in pair of relays False It depends on the…

A: UNIT PROTECTION SCHEME: A bus bar and transmission line, are examples of unit-type schemes that…

Q: 19 Ventilation is achieved by an internally fixed fan in Screen Protected Type DC motor.  Select…

A: In a DC motor, the armature contains slots and conductors are placed in the slots.

Q: A 11 kV, 100 MVA alternator is provided with differential protection .the percentage of winding to…

A:

Q: Murray loop test is performed on a faulty cable 300 m long. At balance, the resistance connected to…

A: A murray loop test is performed on a faulty cable with  cable having 300 m long length.   Now at…

Q: Explain how zone protection applies to the power system from generation to transmission line. Show…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: question: 1. Discuss the mechanism of a short circuit and how it can lead to accidents.

A: Short circuit- Electrical current always try to flow least resistive path. Hence in case if…

Q: A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by differential current protection…

A: We need to calculate per phase voltage minimum fault current unprotected part of alternator winding…

Q: (ii) A 11 kV, 50 MVA alternator is protected by a circulating current protection scheme. The…

A: Protective relay: A relay is an automated device that detects an improper electrical circuit state…

Q: Determine the time of operation of a 5-ampere, 3-second over current relay having a current setting…

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Q: The using of relay is * Break the fault current O Sense the fault Sense the fault and direct to trip…

A: Current transformer is used to step down high current and then the output is feed to relay.

Q: Two relays R1 and R2 are connected in two sections of a feeder as shown in Figure Q2. Relay R1: CT…

A: Given information: Relay R1: CT ratio=300/5, plug setting=2.5 A, TMS=0.3. Relay R2 : CT ratio=500/5,…

Q: A 50 MVA, 3 phase, 33 kV synchronous generator is protected by the Merz-Price protection using…

A: Given Data, VL = 33 KV CT ratio 10005 Resistance (R) = 7.5 ohms   And we have been asked to find the…

Q: 24. Which of the following is not one of the technical reasons for grounding the starpoint ? a)…

A: According to question:  For  Limiting inductive interference between power and communication…

Q: A generator is provided with restricted earth-fault protection. The ratings are 11 kV, 5000 kVA. The…

A: We have a generator which is having restricted earth-fault protection. Line voltage = 11 KV = 11000…

Q: A 60 MVA, 3 phase, 11 kV synchronous generator is protected by the Merz-Price protection using 1000/…

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Q: Q1. The following figure. Current transformers have A RATIO (CTRS)of 400/5 and no error. Relay time…

A: The given figure is shown below: It is given that: CT Ratio=4005Relay time characteristics for…

Q: The current rating of an over current relay is 5 A. The relay has a plug setting of 150 % and time…

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Q: ....... 1- A fault occurs in the protection system as shown below lelllllll To load 200: 1 500 A…

A: (a) The current that enters the relay circuit from CT-1 is As the fault occurs outside the…

Q: Question 5 Equipment rating for the four-bus system in figure below are as follows: Generator G1:…

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Q: Q.3. Give two reasons for overloading and two reasons for short circuit and two precautions to…

A: Two reasons for Overloading: When, the live and neutral wires come in direct contact with each…

Q: A 11 kV, 100 MVA alternator is grounded through a resistance of 5 Ω. The C.Ts have a ratio of 1000 /…

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Q: Problem #4 (22 Pointsk A protective relay with the given curve to the right provides protection for…

A: Given:Ip=IaIbIc=10∠0°010∠120°

Q: For a 220 kV transmission, the number of suspension insulators required is

A: 220 kb transmission line

Q: The primary winding of CT is connected in with the line in which current is to be measured and the…

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Q: Given a 3-Ampere, 5-second overcurrent relay having a current setting of 150% and a time setting…

A: According to the question we have to determine its time of operation

Q: The tap changer with inductive type of impedance uses high speed switching False True Earth relays…

A: 1. The tap changer with inductive type of impedance uses high speed switching. True or False  Given…

Q: Based on the following figure, which below statement is WRONG? mo amimo Of R₁ R₂ a) Relays R1 and R6…

A: Overcurrent relay: Relay is used to detect the fault and send the signal to the circuit breaker to…

Q: Problem-2 A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by a differential…

A: Current transformer is used for two purpose in Power system. As a Measuring instruments  As a…

Q: resistance of 8 Ohms is used to ground a 30-MVA, 11 kV alternator. Its relay is set to operate when…

A: Given,  Earth resistance (R) =8 ohm  Line voltage (VL) =11 kV  Relay operating current = 2.2 A  CT…

Q: Question 4: Protection Systems and Power Economic 4.1 By considering a radial power system shown…

A: Since you have posted a questions with multiple subpart, so we are supposed to answer the 3 subpart.…

Q: A generator is protected by restricted earth fault protection. The generator ratings are 13.2 kV, 10…

A: We have an generator which is protected by restricted earth fault protection. Given Data, VL = 13.2…

Q: False

A:

Q: Problem-2 A star-connected, 3-phase, 10 MVA, 6.6 kV alternator is protected by a differential…

A: In this question we need to find a % of stator winding are unprotected.

Q: The current rating of an over current relay is 5 A. The relay has a plug setting of 150 % and time…

A:

Q: Question # 1: What if a shunt generator is started and no voltage builds up? What could be wrong?…

A: Voltage build up is a process that enables a generator to run in continuous manner. But sometimes it…

Q: An 11 kV, 100 MVA alternator is provided with differential protection. The percentage of winding to…

A:

KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.