The purpose of the restraining coil in a biased differential relay is (A) To reduce CT saturation during fault. (B) To increase the sensitivity of the relay. (C) To match the transformation ratio. (D) To limit the spill current through the relay during heavy external fault.
Last Answer : d
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710 views
2 answers
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May 8, 2018
by
anonymous
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
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547 views
2 answers
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May 8, 2018
by
anonymous
A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is
Last Answer : A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is 6.25A
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728 views
1 answer
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May 3, 2018
by
anonymous
The operating time of instantaneous relay is
Last Answer : The operating time of instantaneous relay is 0.1 sec
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117 views
1 answer
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May 3, 2018
by
anonymous
What is the difference between relay and contactor?
Last Answer : Relay have smaller ratings. Contactor is a high rating relay.
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5.1k views
1 answer
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May 2, 2018
by
anonymous
A negative sequence relay is used for protection of (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines
Last Answer : A negative sequence relay is used for protection of Generator
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627 views
1 answer
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May 1, 2018
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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117 views
1 answer
asked
Apr 30, 2018
by
anonymous
To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with (1) second harmonic current (2) third harmonic current (3) fifth harmonic current (4) seventh harmonic current
Last Answer : To prevent mal-operation of differentially connected relay while energizing a transformer, the relay restraining coil is based with second harmonic current
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495 views
1 answer
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Apr 29, 2018
by
anonymous
Reactance relay is normally preferred for protection against
Last Answer : Reactance relay is normally preferred for protection against earth faults
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120 views
1 answer
asked
Apr 29, 2018
by
anonymous
In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized
Last Answer : In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction
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123 views
1 answer
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Apr 28, 2018
by
anonymous
A solid state relay (A) withstands voltage transients (B) does not require auxiliary dc supply (C) provide low burden on CT and P (D) does not provide earth fault protection
Last Answer : A solid state relay provide low burden on CT and P
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68 views
1 answer
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Apr 28, 2018
by
anonymous
Last Answer : The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.
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829 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : Admittance relay is directional relay.
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153 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : The relay with inverse time characteristic will operate within 5 to 10 sec.
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115 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : The under voltage relay can be used for generators, busbars, transformers, motors.
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68 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : Reactance relay is preferred for phase fault on short transmission line.
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110 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : Induction cup relay is operated due to changes in current, voltage, impedance.
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352 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : Interruption of large currents by relay requires arc suppressing blow out coils, wide separation of the opened contacts, high speed opening of contacts.
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95 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : Overheating of relay contacts or contact born out is due to slow making and breaking of load circuit contacts, foreign matter on the contact surface, too low contact pressure.
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150 views
1 answer
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Mar 20, 2018
by
anonymous
Last Answer : A differential relay measures the vector difference between two or more similar electrical quantities.
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159 views
1 answer
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Mar 19, 2018
by
anonymous
Last Answer : Burden of a protective relay is the power absorbed by the circuit of relay.
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810 views
1 answer
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Mar 19, 2018
by
anonymous
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Last Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.
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152 views
1 answer
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Mar 19, 2018
by
anonymous
Last Answer : The relay operating speed depends upon the spring tension, the rate of flux built up, armature core air gap.
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270 views
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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152 views
1 answer
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Dec 17, 2017
by
anonymous
What is the difference between a switch and a relay?
Last Answer : Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .
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110 views
1 answer
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Dec 17, 2017
by
anonymous
How Magnetism Works
Last Answer : How Magnetism Works Magnetism is a physical force. It causes certain objects to attract or repel another object. This mainly occurs in objects of metallic composition. Magnetism is caused by the motion and ... a south pole. A magnet would always have two poles even if it breaks into several pieces.
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1 answer
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Explain in brief how anti-lock braking system works
Last Answer : An ABS is a system on motor vehicles which prevents the wheels from locking while braking stopping safely is one of the most important functions a motor vehicle can perform. Diagram: ... to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.
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94 views
1 answer
asked
Aug 9, 2019
by
anonymous
The transformer works on the principle of: (A) Mutual induction (B) Mutual capacitance (C) All of the above (D) None of the above
Last Answer : The transformer works on the principle of: Mutual induction
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1 answer
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May 8, 2018
by
anonymous
Last Answer : A hysteresis motor works on the principle of hysteresis loss.
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121 views
1 answer
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Mar 20, 2018
by
anonymous
How does an electric motor works?
Last Answer : In the electric motor there are two types of part 1)moving and 2)stationary In stationary part containing field winding whis use to provide uniform maganetic field it at inner side of yoke In moving ... on it and this force is from all direction we can say it is torque.and motor armature rotates
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119 views
1 answer
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Dec 16, 2017
by
anonymous
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Fuel Pump Relay
Last Answer : Some car owners immediately suspect a fuel pump failure when their cars stall. However, there are many other engine problems that may resemble a fuel pump failure, such as restricted fuel filters, smashed ... advisable to bring your car to the repair shop so that the whole engine can be checked.
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1 answer
asked
May 5, 2021
by
anonymous
main parts of Relay
Last Answer : Coil, plunger, contacts, springs, connecting terminals and enclosure.
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70 views
1 answer
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Aug 28, 2019
by
anonymous
What is phase failure relay and how it's work?
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60 views
0 answers
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Aug 12, 2019
by
anonymous
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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106 views
1 answer
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Apr 29, 2018
by
anonymous
A reactance relay is (A) Voltage restrained directional relay (B) Directional restrained over-current relay (C) Voltage restrained over current relay (D) Directional restrained over voltage relay
Last Answer : A reactance relay is Directional restrained over-current relay
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147 views
1 answer
asked
Apr 28, 2018
by
anonymous
Last Answer : A Buchholz relay can be installed on oil cooled transformers.
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70 views
1 answer
asked
Mar 19, 2018
by
anonymous
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Last Answer : Buchholz's relay gives warning and protection against electrical fault inside the transformer itself.
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107 views
1 answer
asked
Mar 19, 2018
by
anonymous
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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62 views
1 answer
asked
Dec 4, 2017
by
anonymous
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With the help of neat diagram, explain operation of static relay.
Last Answer : Operation of Static Relay: Operation: 1) The solid-state component used are transistors, diodes, resistors, IC s, capacitor etc. The function of comparison and measurement are accomplished by ... ) An auxiliary dc supply is provided for operation of static relay elements as shown in figure.
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1 answer
asked
Jun 23, 2020
by
anonymous
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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228 views
1 answer
asked
Jun 23, 2020
by
anonymous
Describe the operation of current differential relay with neat sketch.
Last Answer : Operation of Current Differential Relay: Figure shows an arrangement of an overcurrent relay connected to operate as a differential relay for alternator protection under fault conditon. ... current flows through relay coil, causing relay to operate for protection of alternator winding.
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104 views
1 answer
asked
Jun 23, 2020
by
anonymous
With a neat sketch, explain the working of Thermal relay.
Last Answer : Working of Thermal Relay: 1) When the system is in normal operating condition, the heating element carries normal current from CT, this current produces heat = I2Rt. This heat ... of the spring releases which operates relay contacts resulting into providing trip signal to trip circuit.
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54 views
1 answer
asked
Jun 23, 2020
by
anonymous
Define the following terms with respect to protective relays i) Relay time ii) Reset current iii) Plug setting multiplier and iv) Time setting multiplier
Last Answer : 1) Relay Time: The time interval between occurrence of fault and closure of relay contacts. 2) Reset Current: The value of current below which the relay resets and comes back to ... The adjustment arrangement provided for setting the operation time of relay is known as Time setting multiplier.
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120 views
1 answer
asked
Jun 23, 2020
by
anonymous
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Draw a typical time-current characteristic for IDMT relay.
Last Answer : Time-Current Characteristic for IDMT Relay:
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167 views
1 answer
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Jun 23, 2020
by
anonymous
Explain operation of balanced beam type relay.
Last Answer : Balanced Beam Type Relay: Under normal operating condition the current through relay coil is such that the beam is held in the horizontal position by the spring. When the fault occurs on the system the ... becomes greater than pick-up value and beam is attracted to close the trip circuit.
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147 views
1 answer
asked
Jul 21, 2019
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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469 views
1 answer
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Jul 21, 2019
by
anonymous
Explain MHO relay in detail.
Last Answer : MHO Relay: In this relay, poles 1, 2, 3 are energized by a voltage V through polarizing coil to produce flux, the capacitor connected provides phase shift. The left pole 4 is energized by a current which is the ... hence on the ratio (I/V) = Y i.e. admittance, hence called as MHO relay.
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2.6k views
1 answer
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Jul 21, 2019
by
anonymous
Describe over current relay with time-current characteristic.
Last Answer : Over current relay with time-current characteristics:- 1. Definite time over current relay: Operating time is constant, the relays operates after a predetermined time when the current exceeds the pickup ... of fault current and definite time characteristics at higher values of fault current.
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316 views
1 answer
asked
Jul 21, 2019
by
anonymous
Explain operation of µP based relay with block diagram
Last Answer : Operation of Microprocessor (µP) based relay: The inputs from the power system through CTs and PTS are received by the analog Input receiver; they are sampled simultaneously or ... compares the dynamic inputs and decides accordingly to generate trip/alarm signal to the output device.
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162 views
1 answer
asked
Jul 21, 2019
by
anonymous
Explain construction and operation of induction type directional over current relay.
Last Answer : Directional overcurrent relay: Construction: It consists of two units: i) Non-directional Over-current unit ii) Directional power unit The directional unit consists of upper electromagnet ... closes the trip circuit. This operates circuit breaker which isolates the faulty section.
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975 views
1 answer
asked
Jul 21, 2019
by
anonymous
