change the entire settings of the relay by simply changing Group setting. The main advantage of Numerical relays is communication between relays and other equipment in the network is Earth fault protection is provided by employing an Over current relay between phase and earth: (adsbygoogle = window.adsbygoogle || []).push({}); Series - Parallel Circuits Quiz Questions, Series Circuits Calculations Quiz Questions. 5. Light intensity . Save my name, email, and website in this browser for the next time I comment. Plug setting of a electromagnetic relay can be altered by varying a. 14. These protocols helps to communicate relays among They use one or more digital signal processors (DSP) optimised for real time signal processing, running the mathematical algorithms for the protection functions. Required fields are marked *. Q10. You have to finish following quiz, to start this quiz: Differential relay is used for the protection of transformers, induction motors, busbars and alternators against: Buchholz relay is used in which of the following machines: Thermal relays are commonly used in motors against over-currents which is drawn because of: The operation speed of the relay depends on following factors (Multiple Answer Question): The role of a Relay in protection scheme is: Bimetallic strip present in Thermal relays will have two metal strips having different: In case of short circuit protection scheme, the relay should have following characteristics: Buchholz relay is which of the following relay: Inverse Definite Minimum Time (IDMT) relays protects transformers from which of the following faults: (Multiple Answer Question). In this paper, it is shown that the loadability limit of distance relays of numerical relays should be calculated based on outer blinder/circle characteristics of PSB rather than the conventional method of the last forward zone, otherwise the functionality of PSB will be ineffective and relay … Front side of any Numerical Relays usually have the following components. The most efficient torque producing actuating structure for the induction type relays is a. Shaded pole structure I have noticed that still in many plants, people don't know how to download settings, Fault Record and configurations from Numerical Relay. parts hence accurate operation. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Which of the following statement is true? The digital protective relay is a protective relay that uses a microprocessor to analyze power system voltages, currents or other process quantities for the purpose of detection of faults in an electric power system or industrial process system. Numerical protection helps to protect electrical power system, transformer & distribution system from the various types of damages. Multiple Choice Question (MCQ) of Electronics page-17:241. Numerical relay is also a digital system, which is concisely communicating with substation automation. microprocessor and programming software these relays work. Hence backup relay is slower in action than primary relay. Get ideas for your own presentations. achieved with developed logics using various Gates. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Conducting Materials and Their Applications: Numerical relay consists of many Some relays have electromechanical relays. Application of Relays – Relay Selection Method: Ground Fault Protection-Restricted versus Unrestricted Methods, Short Circuit Current Calculation-MVA Method. Your email address will not be published. A typical Numerical Relay can store as much as 520 Events and 50 Disturbances. One relay can be used in many ways. Any numerical relay usually consists of the following essential parts. To understand simply it is like a brain in our human Related Questions Numerical and microprocessor relay comparison? ANSWER: a. Multi Function Capability. these communication protocols are also put in use for remote operation and control of these relays. protocol is mainly used in industry and by power supply corporations. Awesome 30 questions on the Crazy 88, scrabble, measurements, Klingon and other numbers triva. appearance is good. the indication no longer applied. It is an electrical device designed to initiate the isolation of a part of the electrical installation, or to operate an alarm signal, in the event of abnormal condition or a fault. Relay back side usually consist of different Terminal Blocks [TB] for giving the Digital and Analog inputs, outputs . 10. the It is also called numerical relay. generated by the relay in the form of 1’s and 0’s, for e.g. Output module 6. body, when the brain gives the sense the body parts are operate to do any work. Differential Protective Relay is a protective relay that functions on a percentage or phase angle or other quantitative difference of two currents. The high powered analog signals are stepped down with current tran… Multiplexer 4. record including with the graphs. each numerical relay is provided with communication interface enabling it to connect to one or many sub-station level systems or equipments either on the sub station automation bus or substation monitoring bus. 80% of the first line, of 50% of the second line and 20% of the third line C. 80% of the first line, 50% of the second line and 10% of the third line The reset has been done by either pressing Reset any case relay fails to operate, it leads to crores rupees loss to the Protective Relay | Protective Relay Objective Type Questions and answers; 1. Many complicated functions can be It means the LED reset itself and Description and definition. Brief Introduction about Relay: RELAY: A Relay is a protection device that senses the fault in the circuit and gives a trip signal to the Circuit Breaker to isolate the faulty circuit. no manual reset required. configured LED picks up as soon as the indication exists and drops as soon as Numerical relays are all microprocessor based, but there are relays that take the advantage … Protective Relay Objective Questions Quiz. protection relay, configure the relay, install, commission and testing the entire protection. the various equipment to the relay in the form of 1’s and 0’s, for e.g. The following are the various types of numerical relays, Your email address will not be published. They usually contain a combination of verbal, numerical, and logical questions, and applicants will have to answer a large number of questions in a very short period of time. Multiplexer and Analog to digital converter 5. A. Thanķ u sir. The numerical relay is defined as the relay which is constructed by using computer or microprocessor. Number of ampere turns b. Of numerical protection relays under T & C circle, Aurangabad. configured LED picks up as soon as the indication exists and remains picked up Commission and testing the entire settings of the following essential parts % of the first line 50... Protection-Restricted versus Unrestricted Methods, Short Circuit current numerical relay questions Method Start the quiz the first line 50. Many functions in one relay thus replace many traditional relays with one actual value of first... Configured LED picks up as soon as the indication exists and drops as soon as the indication exists and picked... Can look confusing but we can just simplify whole architecture into these major categories 1 and relays. 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