Explain the working of an Over current relay and mention the types of it? 22. The output of the relay is a normally-open contact, which changes over to closed state when the relay trips. Electrical Interview Questions for Relay Protection Engineering III Have you also worked on Motor or generator protection or it is only transmission and distribution? Then we asked Steve Shepard, CEO of TwoPointZero and Suzie McInerney, CEO of Six Degrees Executive to take us through why employers ask each question and explain what they look for in a response. A. EelectricalLive.com | 2015-2020 | Contact US, Interview Question On Circuit Breaker And Relay, Torque-Slip Characteristics In Three Phase Induction Motor. Negative sequence relay is employed for the protection of generators and motors against unbalanced loading that may arise due to phase to phase faults. Q. Process lasted around 2 weeks. What Are The Bandwidth Specifications Of Frame Relay? Answer : Soft skills include things like communication, work ethic, time management skills, etc. Behavioral Interview Questions. Become a part of our community of millions and ask any question that you do not find in our Electrical Q&A library. Networking Tutorial. SF6 gas has superior arc quenching capacity and high dielectric strength. Global Relay interview details: 159 interview questions and 108 interview reviews posted anonymously by Global Relay interview candidates. What are the main functions of Differential Relays? Answer: The Impedance relay is suitable for the phase faults relaying for the lines of moderate lengths Reactance type relays are employed for the ground faults while Mho type of relays are best suited for the long transmission lines and particularly where synchronizing power surge may occur What is percentage differential relay? What is the operation principle of the differential relay? What different kind of relaying you have worked with? A. Inverse Time Over-current Relay. A CT whose primary is in series with the line in which current is to be measured. Q. What is the percentage differential relay? We have to allow for the overshoot of the primary relay, so that there is proper coordination between the primary and the back-up. With an additional 53 professionally written interview answer examples. Negative sequence relay is employed for the protection of generators and motors against unbalanced loading that may arise due to phase to phase faults. Instantaneous Over-current Relay 2. At the same time, the relay should be sensitive enough to respond to the smallest fault. The process took 2 weeks. Differential Relays must have the following features: Relay settings mean the actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. In an IDMT (inverse definite minimum time) relay, the operating principle is based on the idea that with the more severe a fault is, the faster it should be cleared to avoid damage to the apparatus. DLCIs have local significance. What is the committed information rate (CIR)? 78% of relaying is still electromechanical. A. If SF6 (Sulpher Hexa Fluoride) gas is used as arc quenching medium in a Circuit breaker, it is termed as SF6 CB. Negative sequence relay is employed for the protection of generators and motors against unbalanced loading that may arise due to phase to phase faults. I interviewed at Relay Therapeutics in February 2020. If you're preparing for a customer service job interview, it can be helpful to review frequently asked questions and answers ahead of time so you have some idea of what to expect. An over-current (OC) relay has a single input in the form of ac current. Refer to the diagram below to answer Question 5 to Question 8 Q5. Think of DLCIs as the MAC address of the Frame Relay network. What is protective relay? Save my name, email, and website in this browser for the next time I comment. In IDMT relay its operating is inversely proportional and also a characteristic of minimum time after which this relay operates. Electric Interview Questions In Relay . A. A. For what type of fault does Buchholz relay is employed? To detect the fault and initiate the operation of the circuit breaker to isolate the defective element from the rest of the system, thereby protecting the system from damages consequent to the fault. d. All of these. Question3: At what layers of the OSI model does Frame Relay operate? Difference between them, Electrical & Instrumentation QC Interview Questions, Start Stop of one Motor from the same Push button PLC program, Remote Seal Transmitters Ranging Calculation, Difference between AC and DC Solenoid Valves, Ability to operate with low values of voltage, There should be no voltage and current creep. Question 2. Soft skills interview questions aim to reveal how strong a candidate's soft skills are before a hiring decision is made. As you prepare for your interview, you may be considering which questions the employer is going to ask you. Question4: What is a Data Link Connection Identifier (DLCI)? Interview. It is inverse in the sense, the tripping time will decrease as the magnitude of fault current increase. Many questions about teamwork will be behavioral interview questions. These are the time setting and the plug setting. Where does the Negative phase sequence relay is employed? A. We can set the pick-up value of the relay, keeping in mind that the relay should allow normal load as well as a certain degree of overload to be supplied. If not, … We tracked down the 10 most-asked interview questions by analysing our Interview Builder tool that employers and recruiters use. Contacted for a phone interview followed by a skype interview with a number of team members. It is inverse in the sense, the tripping time will decrease as the magnitude of fault current increase. Minimum Oil Circuit Breaker 4. Accept Read More, Protection Relays Interview Questions & Answers. Secondary of the CT and the operating coil. Learn Windows Server Interview Questions and answer cracks the interview. Whereas CB gets activated under fault conditions according to the fault detected. Oil Circuit Breaker 3. An over-current (OC) relay has a single input in the form of ac current. Primary winding of a current CT which is connected in series with the line to be protected. Types: 1. Air Blast Circuit Breaker 5. Where does Negative phase sequence relay is employed? Q. Answer : Access Rate; Committed Information Rate; Voice Over Internet Protocol (VOIP) Interview Questions . Question 6. Secondly, it isolates the relay circuitry from the high voltage of the EHV system. A. Shunt Faults: Basically shunt faults are short circuits. differential relay operates when the phasor … A. Define operating time of … Where Impedance relay, Reactance relay, and Mho relays are employed? Question 5. Normal, Alert, Emergency, In extremis and Restorative. Practice 27 Global Relay Communications, Inc. Interview Questions with professional interview answer examples with advice on how to answer each question. We'll assume you're ok with this, but you can opt-out if you wish. Study the electrical engineering technical questions and answers on protection relays to prepare for the job discussions. Air Break Circuit Breaker 2. 0. Best Switchgear Protection Interview Questions and Answers. What is the Power plant or Power Station? A. IDMT relays have better fault clearing times over DTOC relays. 1. Firstly, it steps down the current to such a level that it can be easily handled by the relay current coil. No real technical question but they asked me to submit a piece of code that I had written. Windows Server Interview Questions: Windows Server is a series of different server operating systems that have been developed by the Microsoft Corporation. b. The current transformer has two jobs to do. The output of the relay is a normally-open contact, which changes over to closed state when the relay trips. Where Does Negative Phase Sequence Relay Is Employed? 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 Fuse; Multiple Choice Question (MCQ) of Circuit Breaker page-3 The relay has two settings. 23. Here are some important Windows Server Interview Questions for fresher and experienced candidate both. Here are some very important current transformer interview questions with proper answers which are mostly asked with Electrical Graduates in every industrial interview as … Induction type non-directional over current relay,Induction type directional over current relay & current differential relay. What does the first part consist of? During abnormal & faulty conditions (when current exceeds the rated value) an arc is produced between the fixed & moving contacts & thereby it forms the open circuit arc is extinguished by the Arc Quenching media like air, oil, vacuum etc. Dear Readers, Welcome to Switchgear Protection Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Switchgear Protection.These Switchgear Protection Questions are very important for campus placement test and … 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 Fuse; Multiple Choice Question (MCQ) of Circuit Breaker page-3 The team was very welcoming and friendly. Thus as soon as the fault takes place, it is sensed by both the primary and the back-up protection. Directional relay is used when graded time overload protection is applied to ring mains and interconnected networks. Can we measure over voltage and over current by measuring current only? Explain The Encapsulation Types Of Frame Relay? (adsbygoogle = window.adsbygoogle || []).push({}); A. See a list of common communication skills interview questions. As there is no counter m.m.f, primary m.m.f produces high flux in the core which leads to excessive core losses and overheating. So, they have very short arcing time and can interrupt high currents. Name the different kinds of over current relays. A differential relay operates when the phasor difference of two or more similar electrical quantities exceeds a pre-determined amount. What grades did you get in college? Why distance protection is preferred as primary protection compared to overcurrent protection for transmission lines? What is the operation principle of the differential relay? The generation, distribution, and transmission system … Define IDMT relay? 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. A. Isolators are mainly for switching purpose under normal conditions but they cannot operate in fault conditions. A PT primary is connected in parallel at the point where a measurement is desired. Relay interview details: 1 interview questions and 1 interview reviews posted anonymously by Relay interview candidates. But, DTOC relays are used for lines which are short in length as Zs>>Zl and If remains almost same. Thus fuses are used for only once but breakers can used by multiple number of times. I don't leave many remarks, but i did some searching and wound up here "Interview Questions on Transformer Protection". Interview Questions; Frame Relay; 6. 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