Buchholz relay is used as a safety device with respect to which of the following? A) Audio transformers B) Oil filled power transformers C) Air core transformer D) None of these
Last Answer : Buchholz relay is used as a safety device with respect to which of the following? A) Audio transformers B) Oil filled power transformers C) Air core transformer D) None of these
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asked
Apr 29, 2018
by
anonymous
What Is Buchholz Relay And The Significance Of It In To The transformer ?
Last Answer : Buchholz Relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. whenever any internal fault occurs in a transformer, the Buchholz Relay ... then it stop its sound itself other wise it trips the circuit by its own tripping mechanism.
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1 answer
What is buchholz relay and the significance of it in to the transformer?
Last Answer : A:Buchholz relay is a gas based relay which is used for the protection of transformer from its internal faults. whenever any internal fault occurs in a transformer, the buchholz relay at once gives an ... then it stop its sound itself other wise it trips the circuit by its own tripping mechanism.
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1 answer
In buchholz relay how the top and bottom mercury switches are connected?
Last Answer : Top mercury switch is connected for alarm and bottom switch for trip.
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Where is buchholz relay located?
Last Answer : It is located between transformer tank and conservator.
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1 answer
What is buchholz relay?
Last Answer : It protects the transformer from their internal faults like earth faults, winding short circuit, short circuit between phases, Puncture of bushing etc..
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2 views
1 answer
what is Buchholz relay and the significance of it in to the transformer?
Last Answer : Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. whenever any internal fault occurs in a transformer, the Buchholz ... circuit then it stop its sound itself otherwise it trips the circuit by its own tripping mechanism.
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1 answer
What are the limitations of Buchholz relay?
Last Answer : (a) Only fault below the oil level are detected. (b) Mercury switch setting should be very accurate, otherwise even for vibration, there can be a false operation. (c) The relay is of slow operating type, which is unsatisfactory.
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In buchholz relay how the top and bottom mercury switches are connected?
Last Answer : Top mercury switch is connected for alarm and bottom switch for trip.
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1 answer
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What is the use of buchholz relay in the transformer?
Last Answer : It's a protection relay used in oil immersed transformer to protect the transformer from insulation failure, core heating or any other type of internal faults, which may cause the heating of ... relay first operates and then the trip relay operates to isolate the transformer from the circuit.
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76 The changes in volume of transformer cooling oil due to variation of atmospeheric temperature during day and night is taken care of by which part of transformer? A. Conservator B. Breather C. Bushings D. Buchholz relay
Last Answer : A. Conservator
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1] A Buchholz relay can be installed on A. Auto-transformers B. Air-cooled transformers C. Welding transformers D. Oil cooled transformers
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Describe the construction and Operation of Buchholz relay with neat labeled diagram.
Last Answer : Construction of Buchholz Relay: It takes the form of a domed vessel placed in the connecting pipe between the main tank and the conservator. The device has two elements. The upper element ... manner that it senses the sudden violent movement of oil/gas from transformer tank to conservator.
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1 answer
asked
Jun 23, 2020
by
anonymous
Explain Buchholz relay with neat labelled diagram.
Last Answer : Buchholz relay: The relay is located in the path of the oil from transformer tank to conservator. As seen from diagram, the upper mercury switch operates the alarm circuit due to tilting of the ... manner that it senses the sudden violent movement of oil from transformer tank to conservator.
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474 views
1 answer
asked
Jul 21, 2019
by
anonymous
Buchholz relay is (1) located in the conservator tank (2) located in the transformer tank itself (3) connected in the pipe connecting main tank of transformer and conservator (4) installed in the circuit breaker
Last Answer : Buchholz relay is connected in the pipe connecting main tank of transformer and conservator
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1 answer
asked
Apr 30, 2018
by
anonymous
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A Buchholz relay is used for: A) Protection of a transformer against all internal faults B) Protection of a transformer against external faults C) Protection of a transformer against both internal and external faults D) Protection of instrument transformers and bus bars
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asked
Apr 9, 2018
by
anonymous
Last Answer : A Buchholz relay can be installed on oil cooled transformers.
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1 answer
asked
Mar 19, 2018
by
anonymous
What is the use of Buchholz relay in transformer?
Last Answer : This is a transformer that is used to step up and down current.
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Dec 17, 2017
by
anonymous
44 views
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asked
Mar 9, 2020
by
anonymous
main parts of Relay
Last Answer : Coil, plunger, contacts, springs, connecting terminals and enclosure.
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asked
Aug 28, 2019
by
anonymous
function of equipment’s used in sub-stations : (i) Earth Switch (ii) Relay (iii) Lighting Arrester (iv) Auxiliary transformer
Last Answer : (i) Earth Switch It's function is to discharge the ground capacitance when line is open circuited for maintenance purpose by isolator.) Earthing switch is inter - locked with isolator from the safety point ... 3-ph, 4wire, 400V) to give supply to control room, area lighting, staff quarters etc,
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asked
Aug 25, 2019
by
anonymous
What is phase failure relay and how it's work?
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60 views
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Aug 12, 2019
by
anonymous
126 views
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asked
Nov 24, 2018
by
anonymous
Last Answer : Mho distance relays are widely used for the protection of uncompensated and series compensated transmission lines in order to determine the presence and location of faults.
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asked
Nov 8, 2018
by
anonymous
Draw a neat labeled diagram to show protective system for AC traction and give the function of each relay used in it.
Last Answer : Protective system for AC traction: Function Of Each Relay: For transformer - Inverse time over current relay- as back up protection on primary (HV side) over current ... against faults near substation Under voltage relay - protection against faults far away from substation
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1 answer
asked
Sep 2, 2018
by
anonymous
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.
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1 answer
asked
Sep 2, 2018
by
anonymous
For a traction transformer circuit breaker state: 1) Rated current and rupturing capacity 2) Any two tests it should be capable of withstanding 3) Overall tripping time and relay time.
Last Answer : Ans: 1) Rated current --- 750 A and Rupturing capacity --- 500 MVA 2) Any two tests it should be capable of withstanding --- Breaking test , Reclosing test , Endurance test ( any two ) 3) Overall tripping time --- 0.14 sec and Relay time --- 0.04 sec
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108 views
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asked
Sep 2, 2018
by
anonymous
Explain the construction and working of electronic overload relay.
Last Answer : Electronic overload relay consists of a solid state circuit that operates the electromagnetic switching device to protect the load from overload. The load current is sensed by using a current ... sections. The output of relay driver section sends trip signal to electromagnetic switching device.
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61 views
1 answer
asked
Sep 2, 2018
by
anonymous
Describe the operation of solid state relay.
Last Answer : Solidstate relay is electronic equivalent of an electromechanical relay. It consists of controlled power semiconductor switch like triac. There are four terminals. Two are the power terminals for load and two control ... is turned ON. When triac is ON, the load is connected to AC supply
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1 answer
asked
Sep 2, 2018
by
anonymous
A series resistance is added to the over-current relay in a bus bar differential protection scheme which: a. Helps to develop some voltage across it which otherwise should appear across the relay and is ... the effects of CT saturation and lowers the pickup value of the relay d. All of the above
Last Answer : A series resistance is added to the over-current relay in a bus bar differential protection scheme which: a. Helps to develop some voltage across it which otherwise should appear across the relay and is ... the effects of CT saturation and lowers the pickup value of the relay d. All of the above
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93 views
1 answer
asked
Sep 1, 2018
by
anonymous
The operating characteristics of a reactance type distance relay (A) a stepped waveform for increasing reactance (B) a straight line for a constant reactance (C) a circle for a constant reactance (D) a set of circles for variable reactances
Last Answer : The operating characteristics of a reactance type distance relay a straight line for a constant reactance
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1 answer
asked
Apr 25, 2018
by
anonymous
In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from (A) current in the potential coil (B) both voltage and current in the ... (C) directional element and non-directional element (D) non-directional element and the trip circuit
Last Answer : In induction type directional over current relay the driving torque is due to interaction of magnetic fields derived from directional element and non-directional element
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132 views
1 answer
asked
Apr 25, 2018
by
anonymous
Mho relay is usually employed for protection of (A) Short lines (B) Medium lines (C) Long lines (D) Any line
Last Answer : Mho relay is usually employed for protection of long lines.
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629 views
2 answers
asked
Apr 14, 2018
by
anonymous
What is Relay? A. which transfer power B. opens or closes an auxiliary circuit C. used for short circuit only D. converts AC to DC
Last Answer : opens or closes an auxiliary circuit
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1 answer
asked
Apr 12, 2018
by
anonymous
Mho relay is (a) current restrained current relay. (b) voltage restrained directional relay. (c) current restrained directional relay. (d) voltage restrained current relay.
Last Answer : Mho relay is voltage restrained directional relay. Mho Relay is also known as admittance relay.
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86 views
1 answer
asked
Apr 10, 2018
by
anonymous
In a static over-current relay, inverse time characteristics are obtained by (a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch
Last Answer : B
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1 answer
asked
Apr 10, 2018
by
anonymous
By burden on the relay, we generally mean (a) Current rating of relay (b) Voltage rating of relay (c) Volt-ampere rating of relay (d) Watt rating of relay
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663 views
0 answers
asked
Apr 10, 2018
by
anonymous
Kick fuses are used across relay coils to prevent relay operation during (a) Heavy external faults (b) Inrush current of transformer when they are energised (c) Line to ground faults (d) Bolted faults
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asked
Apr 10, 2018
by
anonymous
Inverse definite minimum time lag relay is also called (A) pilot relay (B) differential relay (C) over current relay (D) directional overcurrent relay
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123 views
0 answers
asked
Apr 9, 2018
by
anonymous
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what is reverse power relay?
Last Answer : Thereverse powerrelay is a directional protective relay that prevents power from flowing in the reverse direction. Read our article going back ... it all to be up to date. And if you do, read it anyway just to check if youreallydo!
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1 answer
asked
Dec 4, 2017
by
anonymous
