Microprocessor based inverse time over current relay. Indicate the difference on R-X diagrams and show where each type is suitable Explain i. Unit 2 Explain the principle of distance relays stating clearly the difference between impedance relay, reactance and mho relay. What protective functions are performed by this device? Explain the essential qualities of protection in detail Describe the construction and principle of operation of (i) Expulsion type lightning arrester, (ii)Valve type lightning arrester. Describe the protection of stations and sub-stations against direct lightning stroke Explain various neutral earthing techniques. Anna University Exams Nov / Dec 2016 – Regulation 2013 Unique Important Questions – 7th Semester BE/BTECH EE6702 Protection and Switchgear Unit 1 Explain the term insulation coordination.
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