interview questions on relays

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07.01.21

A. Fuses are burnt when over current flows in the circuit but circuit breakers will just open during over current. Biased differential relay is preferred because its operation is not affected by the trouble arising out of the difference in the CTs ratios for high values of external short circuit currents. a. Firstly, it steps down the current to such a level that it can be easily handled by the relay current coil. Types: 1. We tracked down the 10 most-asked interview questions by analysing our Interview Builder tool that employers and recruiters use. These questions require you to provide an example from your past work experiences. A. Why distance protection is preferred as primary protection compared to overcurrent protection for transmission lines? A. Refer to the diagram below to answer Question 5 to Question 8 Q5. Negative sequence relay is employed for the protection of generators and motors against unbalanced loading that may arise due to phase to phase faults. Practice 27 Global Relay Communications, Inc. Interview Questions with professional interview answer examples with advice on how to answer each question. Air Blast Circuit Breaker 5. The circuit breaker is an electrically operated switch, which is capable of safely making, as well as breaking, short-circuit currents. 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? Thus fuses are used for only once but breakers can used by multiple number of times. Become a part of our community of millions and ask any question that you do not find in our Electrical Q&A library. Air Break Circuit Breaker 2. Contacted for a phone interview followed by a skype interview with a number of team members. The output of the relay is a normally-open contact, which changes over to closed state when the relay trips. These are the time setting and the plug setting. Only if the primary protection does not clear the fault, the back-up protection should initiate tripping. The relay has two settings. 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. But, DTOC relays are used for lines which are short in length as Zs>>Zl and If remains almost same. c. Tripping circuit. Where does Negative phase sequence relay is employed? It refers to the current or voltage which is used to activate the relay into operation. It is observed in practice that most of the open conductor faults sooner or later develop into some or the other short-circuit fault. Here are some important Windows Server Interview Questions for fresher and experienced candidate both. Best Switchgear Protection Interview Questions and Answers. 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. Where Does Negative Phase Sequence Relay Is Employed? 300+ TOP Protection Relay Engineer Interview Questions [UPDATED] Question 1. Question4: What is a Data Link Connection Identifier (DLCI)? The voltage transformer or potential transformer steps down the high voltage of the line to a level safe enough for the relaying system (pressure coil of relay) and personnel to handle. Safely making, as well as breaking, short-circuit currents short in length Zs. 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