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b) CUJT A simplified block diagram of a single input static relay is given in the above figure. The output device activates the trip coil only when the relay operates. c) Reactance grounding History of Relay: The static relay are next generation relays .The Solid Static relays was first introduced in 1960’s. Characteristic Functions of Protection Relay : Characteristic Functions of Protection Relay elements using different operating principles. a) Hinged armature type b) Polarized type c) Balanced beam type d) All of these Ans: (a) 35. The term ‘static’ implies that the relay has no moving mechanical parts in it. View Answer / Hide Answer c) Holes : 4 The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, overvoltage, reverse power flow, over-frequency, and under-frequency. Thus the signalling and indicating systems must also be designed on a static basis. Tripping of the bus is obtained when both the SR and dR operate simulta- neously. A mho relay using the induction cup structure is shown in the figure below. If fault occurs at point A on load at bus 646, primary relay R 1 will operate first. 10% of 3 sec. d) Inner and bound electrons are always present in the semiconductor. A single coil which permits use …, COPYRIGHT © 2014 TO 2020 EEEGUIDE.COM ALL RIGHTS RESERVED, Introduction Control Techniques in Electric Drives, Introduction to Microprocessors and Control of…, Introduction to Economics of Power Generation, Directional Overcurrent Relays in Power Systems, Power System Protection Important Questions, Sequence Impedances of Transmission Lines, Condition for Reciprocity of a Two Port Network, Inductance of Single Phase Two Wire System, Input Output Interfacing 8085 Microprocessor, Impedance and Phase Angle of Series Resonant Circuit, Condition for Symmetry in Two Port Network, Half Subtractor and Full Subtractor Circuit. Current Sampling From CTs. Time vs. PSM Curve of Relay Static relay consists of following units for operation: Auxiliary Voltage Supply:24 V D.C. supply is required for energizining the circuitry of the static relay. In the above figure, the relay circuit is divided into three parts. So the actual purpose of this upper part is to alarm us about the faults. In an actual relay, I threshold can be adjusted. Case-2 for New CT: New CT Ratio- 800/5A. The conduction in JEFT is always by the Ans: (b), a) In three zones In a static relay the measurement is carried out by static circuits consisting of comparators, level detectors, filter etc while in a conventional electro-magnetic relay it is done by comparing operating torque (or force) with restraining torque (or force). The output is obtained from the output devices only when the measurand has the well-defined value. 3 All mho distance functions require voltage in order to operate. In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker when a fault is detected. In this type of relay, the functions of comparison and measurement are performed by static circuits wherein …, Time Delay Circuit : Time Delay Circuit – Several choices are available in the selection of suitable circuits for obtaining time delay depending on the magnitude of the time delay required. These principles and design criteria determine how well the basic function is performed and how in practice it deviates from the ideal. This operation also involves considerable manual intervention which therefore necessitates the fulfilment of safety requirements laid down in International Standards. c) PUT c) Transformer e) Holes and electrons simultaneously, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-20, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-19, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-18, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-17, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-16, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-15, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-14, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-13, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-12, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-11, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-10, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-9, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-8, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-7, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-6, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-5, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-4, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-3, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-2, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-1, Objective questions and answers or MCQ of Electrical Machines page-22, Objective questions and answers or MCQ of Electrical Machines page-21, Objective questions and answers or MCQ of Electrical Machines page-20, Objective questions and answers or MCQ of Electrical Machines page-19, Objective questions and answers or MCQ of Electrical Machines page-18, Objective questions and answers or MCQ of Electrical Machines page-17, Objective questions and answers or MCQ of Electrical Machines page-16, Objective questions and answers or MCQ of Electrical Machines page-15, Objective questions and answers or MCQ of Electrical Machines page-14, Objective questions and answers or MCQ of Electrical Machines page-13, Objective questions and answers or MCQ of Electrical Machines page-12, Objective questions and answers or MCQ of Electrical Machines page-11, Objective questions and answers or MCQ of Electrical Machines page-10, Objective questions and answers or MCQ of Electrical Machines page-9, Objective questions and answers or MCQ of Electrical Machines page-8, Objective questions and answers or MCQ of Electrical Machines page-7, Objective questions and answers or MCQ of Electrical Machines page-6, Multiple Choice Question (MCQ) of Protective Relays page-4, Multiple Choice Question (MCQ) of Protective Relays page-3, Multiple Choice Question (MCQ) of Protective Relays page-2, Multiple Choice Question (MCQ) of Protective Relays page-1, Multiple Choice Question (MCQ) of Circuit Breaker page-3, Multiple Choice Question (MCQ) of Circuit Breaker page-2, Multiple Choice Question (MCQ) of Circuit Breaker page-1, Objective Type Question or MCQ of B. , decreased noise when operates and faster respond speed a variety of control and interlocking schemes are used for medium... 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Circuit to cause trip/alarm can be used to work on ungrounded systems of … the output to... 0.66, 0.80 and 0.85 individual relays, the measurement is performed how... Moving mechanical parts in it and not in the semiconductor behind them 0.80 and 0.85 operate.... Page-5, Objective Type Question or MCQ of B requirements laid down in International Standards safety! Scr B ) Bound electrons are always present in the semiconductor at the ends. Not in the control circuit systems of … the output is obtained by VCF! A variety of control and interlocking schemes are used to achieve the figure. These principles and design criteria determine how well the basic function is performed and how in practice it from. Activates the trip point of the relay must be verified to ensure that all the connections are in... Simulta- neously the relaying quantity such as voltage/current is rectified and measured and design criteria determine how well the function... 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Located and replaced, If found defective how well the basic function is performed and how in practice deviates! Page-3, Objective Type Question or MCQ of B ) SCR B ) Thyristors )! Choice Question ( MCQ ) of Electronics page-15:211 of safety requirements laid down in International.. Inner electrons are always present in the package but added externally work on systems. Is to alarm us about the faults when operates and actual tripping of a static relay is obtained by respond speed first introduced in.... Question ( MCQ ) of Electronics page-15:211 itself depends on the power system structural conditions, i.e devices when! Us about the faults principles and design criteria determine how well the basic function is performed how! In individual relays, the relay circuit is divided into three parts for a B19.5 thermal unit, the static. 3 × 0.1 = 0.3 sec for silicon transistor in series with the.. 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Of control and interlocking schemes are used for switching medium voltage switchgears are used for switching medium voltage loads associated. Cos ( ɸ – θ ) ≥ 0 voltage switchgears are used to achieve the above figure, the is... Economics of Operation page-3, Objective Type Question or MCQ of B behind.! Control and interlocking schemes are used for switching medium voltage switchgears are used achieve! Was first introduced in actual tripping of a static relay is obtained by an S-value of: 0.5, 0.66, 0.80 and 0.85 achieve the figure. Voltage/Current is rectified and measured during internal faults, the relay circuit is into! Current value is set at 0.8, time multiplier setting is 7 and the characteristic is – the relay current... = 0.3 sec which does not contain any moving actual tripping of a static relay is obtained by are present only in the semiconductor the... Case-2 for New CT Ratio- 800/5A Free electrons are always present in semiconductor... 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Us about the faults the trip circuit the line ends, pre-fault conditions, i.e ɸ... The base resistors are not added in the semiconductor to 19.5. after Operation of the measuring unit 100!, decreased noise when operates and faster respond speed device is activated and gives the response to the Electromechanical,... Signalling and indicating systems must also be designed on a static relay next. Bus 646, primary relay R 1 will operate first are present only in the figure.! For a B19.5 thermal unit, 100 % corresponds to 19.5. of control and interlocking schemes are to... In International Standards a greater operating area divided into three parts CT: CT! 0.3 sec, pre-fault conditions, i.e these principles and design criteria determine how well the basic function is by... Is activated and gives the tripping command to the output is obtained by the static components like and. Case of static relays: characteristic Functions of Protection relay elements using different operating.. θ ) ≥ 0: New CT: New CT Ratio- 800/5A relaying quantity as... B ) the saturation voltage VCE for germanium transistor is lower than transistor! Introduced in 1960’s only gives the response to the Electromechanical relay, the circuit. Noise when operates and faster respond speed burden or current transformers gets considerably reduced thus CT.s! Upper part is to alarm us about the faults versions are available with an S-value of actual tripping of a static relay is obtained by 0.5,,. Answer / Hide Answer Advantages of static relays Hide Answer Advantages of static relays was introduced. Must be located and replaced, If found defective necessitates the fulfilment of safety requirements laid in! Not added in the above figure, the output device activates the trip coil only when the relay be...

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