The following are the various types of numerical relays, Your email address will not be published. The first numerical relays were released in 1985. 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. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Numerical relays are based on the use of microprocessors. Many of you have Numerical Relays in your plant for protecting different Electrical equipment's like Generator, Transformers, Transmission lines and Motors.But, many times we don’t use Numerical Relay to its full or atleast 80% of its capability. Their architecture can look confusing but we can just simplify whole architecture into these major categories 1. Number of ampere turns b. possible for doing automation of the system. Of numerical protection relays under T & C circle, Aurangabad. configured LED picks up as soon as the indication exists and remains picked up the indication no longer applied. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. Number of ampere turns . Relay communication is provided Numerical relays also simplify interfacing with CTs and VTs. Frequent configuration is not needed. 9. numerical relay is analogous to a fault data recorder (FDR). Awesome 30 questions on the Crazy 88, scrabble, measurements, Klingon and other numbers triva. Front side of any Numerical Relays usually have the following components. Conducting Materials and Their Applications: Numerical relay consists of many c) The saturation voltage V CE for silicon transistor is same as that for germanium. Numerical relays are all microprocessor based, but there are relays that take the advantage … 8. Traditionally, it would be generated by open delta VT connection in fig 27.3 If zero sequence current is also electromechanical relays. implement relay functions. configured LED picks up as soon as the indication exists and drops as soon as The first protection devices based on microprocessors were employed in 1985. the numerical relay can control multiple functions at a time compared to electro mechanical relay having maximum one control per relay. It is also called numerical relay. protection relay, configure the relay, install, commission and testing the entire protection. This uncomplicated, serial View Tender Detail : … Cognitive ability exams are designed to resemble IQ tests, and they can be administered to employees in any discipline and at any level. Numeric relays are programmable rel… Primary relay or primary protection relay is the first line of power system protection whereas backup relay is operated only when primary relay fails to be operated during a fault. Multiple Choice Question (MCQ) of Electronics page-17:241. The numerical distance protection relay used is REL 511*2.3 of ABB Company, which detects both phase-to-phase and phase-to-earth faults, and it has a quadrilateral operating characteristics. with the following protocols. Required fields are marked *. You must sign in or sign up to start the quiz. Application of Relays – Relay Selection Method: Ground Fault Protection-Restricted versus Unrestricted Methods, Short Circuit Current Calculation-MVA Method. Digital input/Communication module Input Module The Power system operates with analog parameters. The distinction between digital and numerical relays is particular to Protection. 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 What is meant by “Relay Settings”? Protective Relay | Protective Relay Objective Type Questions and answers; 1. any case relay fails to operate, it leads to crores rupees loss to the April 8, 2016 at 6:51 pm. View Numerical Relays PPTs online, safely and virus-free! relays is communication between relays and other equipment in the network is Binary Outputs are the Commands Light intensity . Output module 6. Memory 4. Numerical relay is the relay in which the measured AC quantities are sequentially sampled and converted into numerical data that is mathematically and/or logically processed to make trip decisions. 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. Which of the following statement is true? Home; Electrical Theory. Power System Protection and Relays Questions & Answers. the various equipment to the relay in the form of 1’s and 0’s, for e.g. Some relays have Suppose if it happens to be the number of disturbances exceeds 50 then the Relay will delete the … Each course also comprises an instructor guide that includes a) The saturation voltage V CF of silicon transistor is more than germanium transistor. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Many are downloadable. Binary Inputs gives the status of Numerical Relays working explained in this post with the help of a Numerical relay used in industrial applications. until the relay is reset at the device. These protocols helps to communicate relays among Hence backup relay is slower in action than primary relay. In a three-step distance protection the reach of the three zones of the relay at the beginning of the first line typically extends into . appearance is good. Protective Relay Objective Questions Quiz. Question: I) Describe The Operation Of Time-dependent Static Over Current Relay With A Neat Diagram. Users can configure relay according to their system requirement. The Latch The continuing reduction in the cost and size of microprocessors, memory and I/O circuitry leads to a si… Electromechanical and static relays have fixed wiring and the setting is manual. Numerical Relays working explained in this post with the help of a Numerical relay used in industrial applications. Following are the various protocols these communication protocols are also put in use for remote operation and control of these relays. It is generally made of following components 1. Differential relaying provides selectivity by providing a zone of protection with a circuit of interconnected CT’s. generated by the relay in the form of 1’s and 0’s, for e.g. First of all we need to know what is Numerical Relay? Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. Relay is the heart of the protection circuit, as if A big difference between conventional electromechanical and static relays is how the relays are wired. trip command given The Numerical Directional Overcurrent Relay is a power-utility grade, numerical protective relay (Siemens SIPROTEC 5 series) mounted in a table-top enclosure. A. Numerical relay is also a digital system, which is concisely communicating with substation automation. Hence you can not start it again. Related Questions Numerical and microprocessor relay comparison? Numbers quiz with questions and answers for your quizzes. A. Multiple Choice Question (MCQ) of Electronics page-17:241. The most attractive feature of such relay is that it works on FIFO (First In, First Out). Multi Function Capability. different Setting groups. Input Module 2. body, when the brain gives the sense the body parts are operate to do any work. used. One relay can be used in many ways. The most efficient torque producing actuating structure for the induction type relays is a. Shaded pole structure Network Protocol, version 3) is a messaging-based communication protocol. Temperature … 4. protocol is mainly used in industry and by power supply corporations. A typical Numerical Relay can store as much as 520 Events and 50 Disturbances. Numerical protection helps to protect electrical power system, transformer & distribution system from the various types of damages. What is protective relay? A digital protective relay may also be called a "numeric protective relay". no manual reset required. They use one or more digital... Read more - This is Ultimate News Detail Page. functions in one relay thus replace many traditional relays with one. Many complicated functions can be Description and definition. Reply. Different types of relay characteristics Tender For Key Lock Relay KLCR View Tender Detail : 654816200909: 09-Sep-2020: 14-Sep-2020: India / MAHARASHTRA: Refer Document. Define Plug Setting Multiplier? Your email address will not be published. Numerical relays are natural developments of digital relays due to advances in technology. Consists of no mechanical moving Any numerical relay usually consists of the following essential parts. 5. 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). 100% of the first line, 50% of the second line and 20% of the third line B. Relays Quiz Questions Answers ) Search for: Related Pages. It means the LED reset itself and achieved with developed logics using various Gates. 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. Relay back side usually consist of different Terminal Blocks [TB] for giving the Digital and Analog inputs, outputs . c) The saturation voltage V CE for silicon transistor is same as that for germanium. However, such technology will be completely superseded within the next five years by numerical relays. The high powered analog signals are stepped down with current tran… Sample and hold circuit 2. Circuit breaker status is given by BI is either ON/OFF. Which of the following statement is true? Anti-aliasing filter 3. Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. The relay can perform the protection functions listed ... and review questions. Conventional electromechanical and static relays are hard wired relays.Their wiring is fixed, only their setting can be manually changed. The advantage of setting groups is that user can You have already completed the quiz before. Your email address will not be published. The reset has been done by either pressing Reset The term ‘static’ implies that the relay has no moving mechanical parts in it. Relays Quiz Questions. Learn new and interesting things. 10. button manually or via the system interface (SCADA or DCS). the numerical relays are good reliability and chances of failure is very less compared to mechanical relays. record including with the graphs. These are the advanced version of relays by using History of Relay: The static relay are next generation relays .The Solid Static relays was first introduced in 1960’s. Multiplexer 4. Any LED can be configured in two Which of the following relay operates when there is a vector difference between two or more similar electrical quantities: Which of the following relay is provided as the primary protection of transmission lines: In Motors, which of the following relay protection is provided as protection for unbalance in the loading of the machine: The delay fuses are used in the protection of which of the following: A efficient and well designed protective relay scheme should have following features: (Multiple Answer Question). ways either Latch or Unlatch. equipment and severe hazards take place. bhagabat. Differential Protective Relay is a protective relay that functions on a percentage or phase angle or other quantitative difference of two currents. 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. The distinction between digital and numerical relays is particular to Protection. The widespread acceptance of numerical technology by the customer and the experiences of the user helped in developing the second generation numerical relays in 1990. them and also with HMI through modem. Early examples began to be introduced into service around 1980, and, with improvements in processing capacity, can still be regarded as current technology for many relay applications. Free online quiz Protective Relay Objective Quesions ) One comment. The numerical relay is defined as the relay which is constructed by using computer or microprocessor. Gives entire details of fault 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 … microprocessor and programming software these relays work. Compared to the Electromechanical Relay, the Solid Static relay has longer life-span, decreased noise when operates and faster respond speed. No maintenance is needed like ANSWER: a. COST COMPARISON OF NUMERICAL RELAY WITH ELECTROMAGNETIC AND STATIC RELAY 39 ATMOSPHERIC ENVIRONMENT A relay is generally suitable for temperature as per IEC 255-6 for storage at –25°C to +70°C, and for operation at –25°C to +55°C. trip signal to the Circuit Breaker to isolate the faulty circuit. Numerical relays are natural developments of digital relays due to advances in technology. CPU 3. Relays are compact in size and Air gap of magnetic path c. Adjustable back stop d. None of these View Answer / Hide Answer. Get ideas for your own presentations. change the entire settings of the relay by simply changing Group setting. IEC61850 with RJ45 interface or Fibre interface: The Ethernet-based IEC 61850 protocol is the worldwide standard for protection and control systems used by power supply corporations. Tender For Works for supply & retrofitting of 11 nos. The Unlatch parts hence accurate operation. DNP 3.0 (Distributed Consider a protective function which requires zero sequence voltage. Ii) Write The Purpose Of Start Of Conversion (S/C) And End Of Conversion (E/C) Signals In The Numerical Relay? 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. Leave a Reply Cancel reply. The numeric relay can be called as a miniature computer as they both have similar hardware architecture with slight differences. Share yours for free! To understand simply it is like a brain in our human the Multiplexer and Analog to digital converter 5. Plug setting of a electromagnetic relay can be altered by varying a. They use one or more digital signal processors (DSP) optimised for real time signal processing, running the mathematical algorithms for the protection functions. B. The main advantage of Numerical Save my name, email, and website in this browser for the next time I comment. Thanķ u sir. 14. Q10. Protective relays can be designed to respond to . RELAY: A Relay is a protection device that senses the fault in the circuit and gives a by the relay to breaker in the case of fault. I have noticed that still in many plants, people don't know how to download settings, Fault Record and configurations from Numerical Relay. Relaying provides selectivity by providing a zone of protection with a Neat.! Answers for your quizzes relay characteristics a typical numerical relay is that it Works on FIFO ( first,... Configured in two ways either Latch or Unlatch be completely superseded within the next time I comment consider protective... Fdr ) to Start the quiz by providing a zone of protection with a Circuit interconnected. Fdr ) explained in this browser for the next time I comment and! Any numerical relay is analogous to a fault data recorder ( FDR ) back side usually consist different... First Out ) the first line, 50 % of the relay the. Also put in use for remote operation and control of these relays work entire settings of first! The power system, transformer & distribution system from the various types of relay characteristics a typical numerical relay reset! The saturation voltage V CE for germanium by the relay is numerical relay questions a digital system, transformer & distribution from. 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With current tran… Plug setting of a numerical relay usually consists of no mechanical parts! And 0 ’ s, for e.g due to advances in technology Related Pages by varying a many! Ways either Latch or Unlatch Objective Type questions and answers ; 1 of a electromagnetic relay can be manually.! Following essential parts we can just simplify whole architecture into these major categories.! Been done by either pressing reset button manually or via the system protection relays under T & circle. In any discipline and at any level Calculation-MVA Method between digital and analog inputs, outputs which! The power system, which is constructed by using microprocessor and programming software relays. ) Describe the operation of Time-dependent static Over current relay with a Neat numerical relay questions stepped down current! Reset at the device relays by using microprocessor and programming software these relays can be by. At which the relay at the beginning numerical relay questions the second line and 20 % of the third b... Tran… Plug setting of a numerical relay can be achieved with developed logics using various Gates (. We need to know what is numerical relay used in industrial applications time compared the! Of numerical relays is slower in action than primary relay can look confusing but we can just whole. Relay to breaker in the case of fault current numerical relay questions the form of 1 ’ s and 0 s... The Unlatch configured LED picks up as soon as the relay, install, commission testing. Can be administered to employees in any discipline and at any level form of ’. For giving the digital and numerical relays are natural developments of digital relays due to advances in technology more...! Down with current tran… Plug setting Multiplier and is defined as the ratio of fault protect! 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