What are the different Generator Protections employed in Thermal Power Plants?

What are the different Generator Protections employed in Thermal Power Plants?
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Answer: Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent energisation, single phase or unbalanced current protection, out of step operation protection, sub-synchronous oscillations protection and earth fault protection
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Related questions

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent energisation ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

What are the protections for GENERATOR TRANSFORMER?

Description : What are the protections for GENERATOR TRANSFORMER?  

Last Answer : a) Differential protection b) Restricted earthfault protection c) Backup earthfault protection d) GT phase back up protection e) Overfluxing protection f) Oil surge (gas) protection g) High winding temperature and oil temperature protection. 

What are the working principles of generator main protections?

Description : What are the working principles of generator main protections?

Last Answer : GENERATOR START UP PROTECTIONS SUPPLEMENTARY PROTECTION OF GENERATOR The generator is normally expected to run rated speed before excitation power is applied by closing the field breaker. ... position to ensure that the protection is inoperable when the machine is connected to grid.  

What are different types of circuit breakers employed in thermal power plant?

Description : What are different types of circuit breakers employed in thermal power plant?

Last Answer : Answer: For low voltage operation 415/220V vacuum circuit breakers or air break circuit breakers are employed. For voltage ratings about 6.6kV and beyond SF6 circuit breakers are employed.

What are different types of circuit breakers employed in thermal power plant?

Description : What are different types of circuit breakers employed in thermal power plant?

Last Answer : For low voltage operation 415/220V vacuum circuit breakers or air break circuit breakers are employed. For voltage ratings about 6.6kV and beyond SF6 circuit breakers are employed.

What are the protections provided for DG?

Description : What are the protections provided for DG?

Last Answer : 1. Differential protection (87). 2. Over speed of engine. 3. Reverse power protection (in LOCA condition time delay). 4. Low lubricating oil pressure. 5. Cooling water temperature high. 6. 6 ... 8. Emergency stops push button. In LOCA condition 4 - 8 protections are not permitted to operate. 

What are the protections used in 415 V Class II side?

Description : What are the protections used in 415 V Class II side?

Last Answer : LV to UPS 1. CTZM 2. 50 (instantaneous over current) 3. short circuit UPS to PMCC S & T 1. 51 RYB (inverse over current) 2. 27 (under voltage) 3. 51N (earth fault) From Class III to Class II tie CTZM at Class III and 51, 51N at Class II. 

What are the protections used in Class III & Class IV 415 V LV side?

Description : What are the protections used in Class III & Class IV 415 V LV side?  

Last Answer : Class III 415 V LV side 1. 51 (inverse over current) 2. 50 (instantaneous over current) 3. 27 (under voltage) 4. 51N (earth fault) 5. 64 (REF)  Class IV 415 V LV side 1. 51 RYB (inverse over current) 2. 51N (earth fault) 

What are the protections provided in charger?

Description : What are the protections provided in charger?  

Last Answer : 1. Over load (49). 2. Over voltage (59). 3. Short-circuit (3250 Amps). 4. Phase sequence and phase fail. 5. di/dt and dv/dt protection. 

What are the protections adopted in UPS or PMCC supply?

Description : What are the protections adopted in UPS or PMCC supply?

Last Answer : LV (incomer) or UPS input CTZM, Over current, Short circuit protections PMCC S or T input or UPS output Under voltage (27), 51RYB, 51N protections. 

What are the protections are there for lines?

Description : What are the protections are there for lines?  

Last Answer : Directional earthfault protection Directional over current protection Local breaker back up protection Pole discrepancy Main protection (distance protection)

What are the protections are there for BUSBAR?

Description : What are the protections are there for BUSBAR?

Last Answer : Instantaneous over current protection Bus bar differential protection Local breaker back up protection 

What are the in-built protections provided in MCC cell?

Description : What are the in-built protections provided in MCC cell? 

Last Answer : Fuses for short circuit protection. OLR for over load and single phasing protection. Electrical and Mechanical interlock in valve cell against short circuit. 

What are the protections provided in PMCC circuit breakers?

Description : What are the protections provided in PMCC circuit breakers?

Last Answer : 1. IDMT O/C (CDG 34). 2. IDMT E/F (CDG 11).  3. Under voltage (40% of 110V). 

What are the protections provided for motor feeder?

Description : What are the protections provided for motor feeder?  

Last Answer : Ith - Thermal over load I2S - Unbalance load I0S - Earth fault protection I1t - Stalling protection I1Inst. - Short circuit protection 

What are the protections for UT?

Description : What are the protections for UT?  

Last Answer : a) Differential protection b) LV restricted earthfault protection c) LV back up earthfault and over current protection d) Buchholz and high oil, winding temperature protection. 

What are the protections for SUT?

Description : What are the protections for SUT? 

Last Answer : a) Over current protection for phase and earth fault b) Differential protection c) HV and LV restricted earthfault protection  d) HV side directional back up over current protection for phase ... protection f) Over fluxing protection g) Buchholz and high oil, winding temperature protection. 

What are the built in protections for transformers?

Description : What are the built in protections for transformers?

Last Answer : a) Buchholz relay b) Explosion vent or relief valve c) Gas operated relay for on load tap changers. 

Why all 415V transformers are chosen Dyn 11? What are the protections provided for the 415V transformers?

Description : Why all 415V transformers are chosen Dyn 11? What are the protections provided for the 415V transformers?

Last Answer : a) To facilitate interchange. b) To have momentary parallel during changeover. Protections a) Door interlock to trip HT and LT breakers. b) LT breaker can on only after HT breaker is in on position. c) ... and restricted E/F (51N + 64). f) Winding temp high trip (140°C trip and 130°C alarm) 

What are the built in protections provided in 415 V breaker?

Description : What are the built in protections provided in 415 V breaker?  

Last Answer : a. DINF (making current magnetic release) This consists of a laminated magnetic circuit. This is placed under the lower current terminal pole. This is provided for all the three poles. It has a core that rotates ... by a lever. It is placed in front of the breaker. Setting range is 60% to 100%.  

What are the protections provided for 220 kV lines and bus bars?

Description : What are the protections provided for 220 kV lines and bus bars? 

Last Answer : a. Bus bar differential protection. b. Distance protection. c. Over current protection. d. Earth fault protection. 

How Generator Transformer is cooled in Thermal Power Plant?

Description : How Generator Transformer is cooled in Thermal Power Plant?

Last Answer : Answer: MVA power rating of the Generator Transformer will be equal to the alternator. Hence lot of heat will be generated while generator transformer is under operation. Oil Forced Air Forced (OFAF) type of cooling is employed for generator transformer

How Generator Transformer is cooled in Thermal Power Plant?

Description : How Generator Transformer is cooled in Thermal Power Plant?

Last Answer : MVA power rating of the Generator Transformer will be equal to the alternator. Hence lot of heat will be generated while generator transformer is under operation. Oil Forced Air Forced (OFAF) type of cooling is employed for generator transformer

What are different types of Steam boilers used in Thermal Power Plants?

Description : What are different types of Steam boilers used in Thermal Power Plants?

Last Answer : Answer: Different type of boiler used in thermal power plants are: • Fire tube boiler • Water tube boiler • Natural Circulation boiler • Forced Circulation boiler • Once through boiler

What are different types of Steam boilers used in Thermal Power Plants?

Description : What are different types of Steam boilers used in Thermal Power Plants?

Last Answer : Different type of boiler used in thermal power plants are: Fire tube boiler Water tube boiler Natural Circulation boiler Forced Circulation boiler Once through boiler

What are the different relays that employed for protection of apparatus and transmission lines?

Description : What are the different relays that employed for protection of apparatus and transmission lines?

Last Answer : Answer: The relays that are usually employed for protection of transmission lines include • Over current relay • Directional relay • Distance relay • Under Voltage relay • Under-frequency relay • Thermal relay • Differential relay • Phase sequence relays • pilot relays

What are different insulators employed in substations?

Description : What are different insulators employed in substations?

Last Answer : Some of the insulators employed in substations are: Pin insulators Post insulators Strain insulators Suspension insulators Hallow apparatus insulators Dead-end insulators Solid core insulators

Steam pressures usually used in thermal power plants are (A) 5 kg/cm2 to 10 kg / cm2 (B) 50 kg/cm2 to 100 kg / cm2 (C) 110 kg/cm2 to 170 kg / cm2 (D) 200 kg/cm2 to 215 kg / cm2

Description : Steam pressures usually used in thermal power plants are (A) 5 kg/cm2 to 10 kg / cm2 (B) 50 kg/cm2 to 100 kg / cm2 (C) 110 kg/cm2 to 170 kg / cm2 (D) 200 kg/cm2 to 215 kg / cm2

Last Answer : Ans: C

Why Thermal Power Plants are always situated by the side of rivers or lakes?

Description : Why Thermal Power Plants are always situated by the side of rivers or lakes?

Last Answer : Thermal Power Plants are situated close to the rivers or lakes because to meet the large quantity of the water requirement. Water is required in the steam power plants steam in the boiler for cooling purposes such as in condensers as carrying medium such as in disposal of ash for drinking purpose

Define draught, what is the use of draught in thermal power plants?

Description : Define draught, what is the use of draught in thermal power plants?

Last Answer : Draught is defined as a small pressure difference required between the fuel bed (furnace) and outside air to maintain constant flow of air and to discharge the gases through chimney to the atmosphere. ... combustion products through the system. · To remove burnt products from the system

Which of the device is employed in substation to limit the short circuit current in the power system: a) Shunt condenser b) Reactor c) Series capacitor d) Shunt capacitor

Description : Which of the device is employed in substation to limit the short circuit current in the power system: a) Shunt condenser b) Reactor c) Series capacitor d) Shunt capacitor

Last Answer : Ans: B

In order to improve the power factor ___ device is employed in the substation a) Synchronous condenser b) Synchronous reactor c) Series Capacitors d) None of the above

Description : In order to improve the power factor ___ device is employed in the substation a) Synchronous condenser b) Synchronous reactor c) Series Capacitors d) None of the above

Last Answer : Ans: A

The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)

Description : The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)

Last Answer : Ans: B The line trap unit employed in carrier current relaying offers high impedance to carrier frequency signal. Because carrier frequency range is 35 km – 500 kHz XL = 2Π f l Where f increases XL will also increases

Pick out the wrong statement. (A) Higher temperature is employed in visbreaking than in thermal cracking (B) Pyrolysis is a mild thermal cracking process (C) Lead susceptibility of petrol produced by catalytic process is more than that produced by thermal cracking (D) Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process

Description : Pick out the wrong statement. (A) Higher temperature is employed in visbreaking than in thermal cracking (B) Pyrolysis is a mild thermal cracking process (C) Lead susceptibility of ... Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process

Last Answer : (A) Higher temperature is employed in visbreaking than in thermal cracking (B) Pyrolysis is a mild thermal cracking process

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid. (A) Viscosity (B) Density (C) Thermal conductivity (D) Corrosive nature

Description : The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid. (A) Viscosity (B) Density (C) Thermal conductivity (D) Corrosive nature

Last Answer : (A) Viscosity

Why are children considered deserving of protections that other weak or powerless individuals do not get?

Description : Why are children considered deserving of protections that other weak or powerless individuals do not get?

Last Answer : We do have protections in place. Every state has an Adult Protective Services division and that people are allowed to file bankruptcy rather than be held totally responsible for their debts is a form of protecting ... 't we can only protect them so far and so much and then they are on their own.

What store sells laptop protections?

Description : What store sells laptop protections?

Last Answer : Best Buy would have laptop protectors. And yes it would be a good investment to buy one for your laptop. It will protect your laptop from getting scratched or dinged from being dropped.

How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Description : How are circuits protections devices connected to the circuit they are intended to protect and why are they connected in this way?

Last Answer : In series, so total current will be stopped when the device opens.

State the types of protections provided by MCB.

Description : State the types of protections provided by MCB. 

Last Answer : The types of protections provided by MCB: 1. MCB provides short circuit protection. 2. MCB provides overload protection

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Description : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Last Answer : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when The incremental fuel cost of each plant multiplied by the penalty factor is the same

Which of the following busbar arrangement is generally employed in distribution system: a) One-and-half breaker arrangement b) Main and transfer arrangement c) Ring main distribution system d) Single busbar arrangement system

Description : Which of the following busbar arrangement is generally employed in distribution system: a) One-and-half breaker arrangement b) Main and transfer arrangement c) Ring main distribution system d) Single busbar arrangement system

Last Answer : Ans: C

When electrical cables penetrate watertight bulkheads, _______________. A. they should be grounded on either side of the bulkhead B. they must be bent to a radius of six diameters C. a watertight stuffing tube capable of accepting packing should be employed D. they should be secured by a clamp

Description : When electrical cables penetrate watertight bulkheads, _______________. A. they should be grounded on either side of the bulkhead B. they must be bent to a radius of six diameters C. a watertight stuffing tube capable of accepting packing should be employed D. they should be secured by a clamp

Last Answer : Answer: C

For distribution network which type of Switching scheme is employed?

Description : For distribution network which type of Switching scheme is employed?

Last Answer : For distribution network Ring Main busbar scheme is employed. It has the provision that if power interruption occurs to one bus section due to maintenance or fault, power can be fed the bus from other side of the power system.

A bus disconnect link is used to isolate _____________. A. one bus bar from another B. the generator circuit breaker from the bus C. different phases from the equalizer connection D. positive and negative buses from the neutral

Description : A bus disconnect link is used to isolate _____________. A. one bus bar from another B. the generator circuit breaker from the bus C. different phases from the equalizer connection D. positive and negative buses from the neutral

Last Answer : Answer: B

What are Motor Generator Sets and explain the different ways the motor generator set can be used ?

Description : What are Motor Generator Sets and explain the different ways the motor generator set can be used ?

Last Answer : Motor Generator Sets are a combination of an electrical generator and an engine mounted together to form a single piece of equipment. Motor generator set is also referred to as a genset, or more ... to DC at another voltage 4.AC at one frequency to AC at another harmonically-related frequency

What is the cooling medium for different parts of the turbo generator?

Description : What is the cooling medium for different parts of the turbo generator?

Last Answer : Stator – DM water. Rotor – Hydrogen. Bearing – Oil.

According to Coast Guard Regulation (46 CFR) for emergency power and lighting systems, which of the listed items is the only permissible starting aid for the emergency diesel generator engine? A. Ether B. Lube oil heater C. Jacket water heater D. Fuel oil heater

Description : According to Coast Guard Regulation (46 CFR) for emergency power and lighting systems, which of the listed items is the only permissible starting aid for the emergency diesel generator engine? A. Ether B. Lube oil heater C. Jacket water heater D. Fuel oil heater

Last Answer : Answer: C

Coast Guard Regulations (46 CFR) require that each alternating current generator arranged for parallel operation shall be provided with _____________. A. more than one means of excitation B. individual circuit fuses C. a high back-pressure trip D. a reverse-power trip

Description : Coast Guard Regulations (46 CFR) require that each alternating current generator arranged for parallel operation shall be provided with _____________. A. more than one means of excitation B. individual circuit fuses C. a high back-pressure trip D. a reverse-power trip

Last Answer : Answer: D

The shipboard general alarm system must receive its main source of power from _____________. A. a storage battery B. the emergency generator C. an auxiliary generator D. the ship's service generator

Description : The shipboard general alarm system must receive its main source of power from _____________. A. a storage battery B. the emergency generator C. an auxiliary generator D. the ship's service generator

Last Answer : Answer: A

The source of emergency lighting and power at loss of normal ship's power on a cargo vessel should be obtained from the ______________. A. emergency generator supply to the emergency switchboard B. emergency generator supply to the main switchboard C. battery supply to the main switchboard D. turbogenerator supply to the emergency switchboard

Description : The source of emergency lighting and power at loss of normal ship's power on a cargo vessel should be obtained from the ______________. A. emergency generator supply to the emergency ... switchboard C. battery supply to the main switchboard D. turbogenerator supply to the emergency switchboard

Last Answer : Answer: A