Explain with neat sketch overload protection for power circuit of locomotive.

Explain with neat sketch overload protection for power circuit of locomotive.
by

1 Answer

Answer :

Overload Protection for Power Circuit of Locomotive: 

image

1. To protect the main power circuit from overload, the thermal overload relays are used. 2. The overload is sensed by the overload relay which gives tripping signal to CB on occurrence of overload and the circuit is disconnected. 3. The overload relays and CB are provided in different sections of power circuit as shown in the above figure. 4. The overload relay OLR1 operates for overload on transformer side due to shorting of turns or any abnormal reasons. 5. The overload relay OLR2 operates for overload fault due to failure of diodes. 6. Similarly the overload relay OLR3 operates for overload fault on traction motor due to the flashover of traction motors. 

by

Related questions

Explain protection of locomotive from overvoltage and under voltage

Description : Explain protection of locomotive from overvoltage and under voltage

Last Answer : Protection of Locomotive From Overvoltage and Under Voltage: 1. For protection against over voltages the over voltage relay which is basically a potential transformer (PT) is used. 2. ... a relay triggering an alarm, which enables the power controller to react and take corrective measures.

Explain the surge protection of electric locomotive from i) Direct lightening stroke ii) Switching surges

Description : Explain the surge protection of electric locomotive from i) Direct lightening stroke ii) Switching surges

Last Answer : i)Protection of Electric Locomotive From Direct Lightening Stroke:  1. The direct lightning strokes may strike on the overhead conductor on the roof of the locomotive. 2. To protect the ... reduce the steepness of the wave front and also help to absorb the energy in the resistance.

With neat sketch explain automatic weight tension and temperature compensation.

Description : With neat sketch explain automatic weight tension and temperature compensation.

Last Answer : Automatic Weight Tension and Temperature Compensation: The tension in overhead lines in traction systems depends on the temperature. Higher temperatures lead to expansion of conductors and hence sag. It is therefore ... figure. The tension in the contact wire and catenary is around 1000 kg.

Draw a neat sketch of ‘Locomotive coupler’ mechanism. Explain its working in brief.

Description : Draw a neat sketch of ‘Locomotive coupler’ mechanism. Explain its working in brief.

Last Answer : Figure: Coupler Rod of Locomotive  (Link AD = Link BC = Crank Link CD = Coupling Rod Link AB = Fixed Link = Frame) Working of Coupler Rod of Locomotive: It is an ... center distance between them. This mechanism is meant for transmitting rotary motion from one wheel to the other wheel.

State the classification of locomotive.

Description : State the classification of locomotive.

Last Answer : Classification of Locomotive:  A) Based on the types of service rendered:  1. Freight service for transportation of goods only.  2. Passenger service for transportation of passengers.  3. Mixed traffic ... the type of supply used:  1. Alternating current (AC)  2. Direct current (DC)

Draw neat labeled diagram of single phase AC locomotive showing its various equipments of power circuit and give function of each equipment used in power circuit.

Description : Draw neat labeled diagram of single phase AC locomotive showing its various equipments of power circuit and give function of each equipment used in power circuit.

Last Answer : Functions of equipment: 1) circuit breaker: disconnects the locomotive equipment from the supply in the event of fault in the equipment / loco. 2) On load tap changer, used to control the ... 6) Traction motor: operates as per the required operating characteristics to take on the traction load.

Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Description : Draw a neat sketch of earth fault protection of auxiliary circuit of electric loco. State the function of relay and isolating resistance.

Last Answer : Ans: Earth fault protection for auxiliaries in Loco: Function of relay: The earth fault occurring anywhere in the auxiliary circuit gets monitored by the relay which acts to trip the main CB. Function of ... star point to earth through a high resistance so that the relay operation is avoided.

Explain with neat diagram i) Sectioning and paralleling post ii) Sub sectioning post

Description : Explain with neat diagram i) Sectioning and paralleling post ii) Sub sectioning post

Last Answer : i) Sectioning and Paralleling Post: Explanation of Sectioning and Paralleling Post: 1. The power supply arrangement is as shown in above figure for two track lines between feeding posts and ... subsection or the other. 4. There is no interrupter for paralleling the up and down track line

Explain with neat diagram trolley collector for overhead system

Description : Explain with neat diagram trolley collector for overhead system

Last Answer : Trolley Collector for Overhead System:  This consists of a grooved gun metal wheel or grooved slider shoe with carbon insert carried attached to the end of a long pole provided on the top of ... gives rise to high current density. Suitable for comparative low speed (say 22 to 30 kmph).

The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power

Description : The purpose of a magnetic relay is to _____________. A. open a circuit only in the event of overload B. remotely open and close contacts C. provide overcurrent protection during starting D. relay voltages at increased power

Last Answer : Answer: B

The type of control circuit that will not permit automatic restarting after power is restored, following a power failure is called _____________. A. low voltage protection B. low voltage release C. overload lockout D. reduced voltage restart

Description : The type of control circuit that will not permit automatic restarting after power is restored, following a power failure is called _____________. A. low voltage protection B. low voltage release C. overload lockout D. reduced voltage restart

Last Answer : Answer: A

Explain with neat sketch, the Pilot wire protection scheme applied to transmission line.

Description : Explain with neat sketch, the Pilot wire protection scheme applied to transmission line.

Last Answer : Pilot Wire Protection scheme of Transmission Line : Figure shows the single line diagram of Merz price voltage balance system for pilot wire protection of three phase transmission line. ... through the relay, which gives trip signal to the circuit breaker for protection of transmission line.

Explain differential protection scheme for busbars with neat sketch.

Description : Explain differential protection scheme for busbars with neat sketch.

Last Answer : Differential Protection Scheme for Bus bar:  Under normal conditions, the sum of the currents entering the bus bar zone is equal to those leaving it and no current flows through the relay ... of these currents will flow through the relay coil causing opening of circuit breaker of bus-bar.

Explain distance protection of transmission line with neat sketch diagram.

Description : Explain distance protection of transmission line with neat sketch diagram.

Last Answer : Distance protection of Transmission line: Distance protection scheme uses impedance relay. The relay operation is based on the impedance (or distance) between the relay and point of fault. Figure shows ... than ZL and impedance relay operates which operates the CB and line is protected.

Draw a neat sketch and explain the use of CT and PT for measurement of power in a single-phase circuit?

Description : Draw a neat sketch and explain the use of CT and PT for measurement of power in a single-phase circuit?

Last Answer : If wattmeter of proper range is not available or if voltage and current ranges are high we can usr CT and PT of suitable ratio. Connect the CT and PT as shown in figure. The reading of wattmeter can be multiplied by the ratio to get the actual power.   

Give protection scheme used for 25kV catenary protection for AC traction.

Description : Give protection scheme used for 25kV catenary protection for AC traction.

Last Answer : Protection Scheme Used for 25kV Catenary Protection for AC Traction: As shown in the figure below the scheme consists of 1) MHO relay that makes use of the impedance phase angle to get proper ... adjustment. 2) Over current relay. 3) Under voltage relay for low voltage protection.

State any four relays used for catenary protection. State function of each relay.

Description : State any four relays used for catenary protection. State function of each relay.

Last Answer : Relays Used for Catenary Protection: 1. MHO relay: Wrong coupling protection. 2. MHO relay: Over current protection at farthest point. 3. Over current relay: Over current protection against faults near substation 4. Under voltage relay: Protection against faults far away from substation. 

Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Description : Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Last Answer : Answer: B

The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Description : The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Last Answer : Answer: D

Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Description : Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Last Answer : Answer: B

A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage

Description : A thermal protection switch can protect against (a) short-circuit (b) temperature (c) overload (d) over voltage

Last Answer : (c) overload

What is the purpose of Overload Protection in a motor circuit?

Description : What is the purpose of Overload Protection in a motor circuit?

Last Answer : Ans. The Overload Protection is used in a motor circuit to protect it from sustained over currents.

Write down the circuit breaker with their rating used in traction substation. Explain any one.

Description : Write down the circuit breaker with their rating used in traction substation. Explain any one.

Last Answer : Circuit Breaker With Their Rating Used in Traction Substation: Rated capacity of a circuit breaker is 750Amps at 25 kV, 500MVA. Its overall tripping time is 0.14 seconds composed of 0.04 ... but in case of traction substation application, mostly Minimum Oil Circuit Breaker (MOCB) is preferred.

Draw a neat labelled block diagram of AC electric locomotive. State the function of each part.

Description : Draw a neat labelled block diagram of AC electric locomotive. State the function of each part.

Last Answer : labelled diagram ofAC electric locomotive:  Function of AC electric locomotive Parts: 1) Overhead contact wire: Supply of 1-ph, 25KV, 50Hz, AC is given to overhead conductor. 2) Current collecting ... mechanical power to run the train i.e. DC series motor which is used as traction motor.

Where automatic restart does not present a hazard after a power failure, Coast Guard Regulations (46 CFR) require motor controllers for auxiliaries vital to the propelling equipment to be provided with ________________. A. overload protection B. low voltage protection C. low voltage release D. reverse current protection

Description : Where automatic restart does not present a hazard after a power failure, Coast Guard Regulations (46 CFR) require motor controllers for auxiliaries vital to the propelling equipment to be provided ... overload protection B. low voltage protection C. low voltage release D. reverse current protection

Last Answer : Answer: C

The 'reset' contacts of the master switch shown in the illustration provides the winch controller with ___________. EL-0102 A. low voltage release B. overload protection C. low voltage protection D. high power factor correction

Description : The 'reset' contacts of the master switch shown in the illustration provides the winch controller with ___________. EL-0102 A. low voltage release B. overload protection C. low voltage protection D. high power factor correction

Last Answer : Answer: C

RC time constant characteristics, as shown in the illustration, are important in _____________. EL-0086 A. bridge rectifiers for alternator excitation B. timing and pulse shaping circuits C. transistor power amplifier biasing D. motor controller overload protection

Description : RC time constant characteristics, as shown in the illustration, are important in _____________. EL-0086 A. bridge rectifiers for alternator excitation B. timing and pulse shaping circuits C. transistor power amplifier biasing D. motor controller overload protection

Last Answer : Answer: B

State the function of a contactor in a power circuit of locomotive. List different types of it and state one application of each.

Description : State the function of a contactor in a power circuit of locomotive. List different types of it and state one application of each.

Last Answer : Ans: Contactor in power circuit of locomotive is used to connect relevant sections for operation. Connecting or disconnecting the power circuit at different conditions of operation and at different locations. ... heavy power currents. 3) Cam & roller operated - used for group switching.

Explain the function of different parts of a typical nuclear power plant with neat sketch.

Description : Explain the function of different parts of a typical nuclear power plant with neat sketch. 

Last Answer : Functions of each part of Nuclear power plant:-  1) Nuclear Reactor: In nuclear reactor the fuel rod of U235 is placed through which tremendous amount of heat energy is ... is mechanically coupled with steam turbine. 8) Alternator: It converts mechanical energy into electrical energy.

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Description : With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Last Answer : Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

Which of the following statements is true concerning the motor controller diagram shown in the illustration? EL-0023 A. Terminal 'T2' is hot only on high speed. B. Both indicating lights will be lit on both high and low speeds as they are connected to the common lead when the motor is running. C. Overload protection is provided for high speed operation only. D. 'L2' is always connected to 'T2' whenever the motor is running.

Description : Which of the following statements is true concerning the motor controller diagram shown in the illustration? EL-0023 A. Terminal 'T2' is hot only on high speed. B. Both indicating lights will be lit on ... high speed operation only. D. 'L2' is always connected to 'T2' whenever the motor is running.

Last Answer : Answer: D

Component F in the illustrated device is for _________. EL-0033 A. short circut protection B. latching the trip unit closed after resetting the breaker C. overload protection D. providing a flexible connection between the input terminal G and the tripping unit E

Description : Component F in the illustrated device is for _________. EL-0033 A. short circut protection B. latching the trip unit closed after resetting the breaker C. overload protection D. providing a flexible connection between the input terminal G and the tripping unit E

Last Answer : Answer: C

H.R.C. fuses provide best protection against (a) overload (b) reverse current (c) open-circuits (d) short-circuits

Description : H.R.C. fuses provide best protection against (a) overload (b) reverse current (c) open-circuits (d) short-circuits

Last Answer : (d) short-circuits

An element in electronics which serves as a protection against overload?

Description : An element in electronics which serves as a protection against overload?

Last Answer : fuse

A relay used for protection of motors against overload is :

Description : A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Last Answer : D

List any eight equipment used in auxiliary circuit of electric locomotive.

Description : List any eight equipment used in auxiliary circuit of electric locomotive.

Last Answer : Ans: 1) Batteries , 2) Compressor , 3) Blowers , 4) Exhausters , 5) Pumps , 6) Cab ventilating fans.7) Locomotive heating (if any) , 8) Transformer oil cooling radiator. 9) head light , 10) Flasher light , 11) Marker light , 12) Engine Horn

The purpose of the reverse power relay, provided on a ship's service alternator panel, is to trip the circuit in the event of ______________. A. main circuit overload B. high power transfer C. generator overspeeding D. alternator motorization

Description : The purpose of the reverse power relay, provided on a ship's service alternator panel, is to trip the circuit in the event of ______________. A. main circuit overload B. high power transfer C. generator overspeeding D. alternator motorization

Last Answer : Answer: D

Humming or buzzing of electric contacts is a symptom of ____________. A. low voltage on the operating coil B. power failure to the operating coil C. a control circuit ground D. a control circuit overload

Description : Humming or buzzing of electric contacts is a symptom of ____________. A. low voltage on the operating coil B. power failure to the operating coil C. a control circuit ground D. a control circuit overload

Last Answer : Answer: A

The purpose of a main switchboard circuit breaker's reverse-power trip is to _____________. A. prevent main circuit overload B. protect the circuit breaker blowout coil C. prevent alternator motorization D. prevent low voltage tripout

Description : The purpose of a main switchboard circuit breaker's reverse-power trip is to _____________. A. prevent main circuit overload B. protect the circuit breaker blowout coil C. prevent alternator motorization D. prevent low voltage tripout

Last Answer : Answer: C

Describe the operation of class-C type of power amplifier with the help of neat sketch.

Description : Describe the operation of class-C type of power amplifier with the help of neat sketch.

Last Answer : Circuit diagram: Operation: * Class C power amplifier is a type of amplifier where the transistor conducts for less than one half cycle of the input signal. Less than one ... resonant circuit oscillates in one frequency (generally the carrier frequency) all other frequencies are attenuated. 

Draw and explain in brief construction of Diamond Pantograph. Write one advantage and one disadvantage of it.

Description : Draw and explain in brief construction of Diamond Pantograph. Write one advantage and one disadvantage of it.

Last Answer : Diamond Pantograph: Construction of Diamond Pantograph: 1)Diamond Pantograph consist of pressed steel channel sectional fitted with renewable collector strips and supported at the apex of Pentagonal ... It requires more maintenance than Faiveley type. 4. It is costlier than Faiveley type.

Explain the following - 1) Encumbrance 2) Span length.

Description : Explain the following - 1) Encumbrance 2) Span length.

Last Answer : Encumbrance: It is the axial distance between catenary and contact wire. Its value is maintained at 1.4 m as per rules except at i) Turn outs, ii) Overlaps iii) In the vicinity of over ... depends various factors like: i) Wind pressure ii) Curvatures iii) Current collection point of view etc.

Explain electrostatic separation with a neat sketch.

Description : Explain electrostatic separation with a neat sketch. 

Last Answer : Electrostatic Separator Principle: If one or more of the materials of a granular mixture can acquire a  surface charge on or just before entering an electrostatic field, the particles of that ... repelled by electrode ,attracted by drum, falls straight in collecting bin due to gravity. 

Explain with a neat sketch the working of the apparatus used for distillation on laboratory scale.

Description : Explain with a neat sketch the working of the apparatus used for distillation on laboratory scale. 

Last Answer : There are two apparatus used for distillation on laboratory scale. 1. Simple apparatus. 2. Still apparatus. Simple apparatus: Working: 1. Water is filled in the round bottom flask. ... level device is fitted in such a way that only heated water free from gases enters the boiler. 

Explain with the help of a neat sketch one of the evaporators covered under the group of natural circulation evaporators.

Description : Explain with the help of a neat sketch one of the evaporators covered under the group of natural circulation evaporators.

Last Answer : Natural circulation evaporators: The movement of liquid takes place as a result of convection current set up by heating process. Ex. evaporating pan, evaporating still, and short tube evaporator.  1. Evaporating ... area for evaporation. It consist of product outlet at bottom. Diagram:

Explain working of Gobar Gas plant with a neat sketch.

Description : Explain working of Gobar Gas plant with a neat sketch.

Last Answer : It is a type of composting plant. In this plant gobar gas is produced from solid waste which is biodegradable in nature. A mixture of gases is produced by breakdown of organic matter in the absence of ... Dioxide. It is used as a fuel and the digested sludge is used as fertilizer for crops

Explain the requirements of good formwork with names and materials proposed for beam of size 300 X 450 mm with neat labeled sketch.

Description : Explain the requirements of good formwork with names and materials proposed for beam of size 300 X 450 mm with neat labeled sketch.  

Last Answer : Requirements of good formwork:- 1. It should be adequately strong to withstand an extensive variety of dead and live loads. For instance, self-weight, weight of reinforcement, weight of wet concrete, loads of ... of concreting. 8. It should be lightweight. 9. It should be easy to remove.

Explain raft foundation with neat sketch and explain its suitability.

Description : Explain raft foundation with neat sketch and explain its suitability. 

Last Answer : Raft Footing: It is suitable where ground is soft. Clayey or marshy having low bearing capacity, and where sub soil water conditions are uncertain. The raft foundation is also used to reduce settlement below highly compressible soils

Define shoring. Enlist types of shoring. Explain any one type with neat sketch.

Description : Define shoring. Enlist types of shoring. Explain any one type with neat sketch.

Last Answer : Shoring:- Shoring is the construction of a temporary structure to support temporarily an unsafe structure. These support walls laterally. Shoring can be used when walls bulge out, when walls crack due to ... of the structure above and transfer same to the ground on firm foundation below. 

Explain four defects in plastering with neat sketch.

Description : Explain four defects in plastering with neat sketch.

Last Answer : Following are the defects in plastering: 1) Blistering of plastered surface: it is the defect in which small patches of plaster are swelled out from the plastered surface. 2 ... defect in which there is complete dislocation of some portion of plastered surface which forms the patches.