Electrician Exam – Important Questions
1.Which of the following is the starter used for 3 phase slip ring induction motor? Rotor resistance 2. The conductor used for over head transmission line is….? ACSR 3. The current transformer is used...
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Differential Protection of Alternators or Merz-Price circulating current protection
Differential protection or Mertz Price circulating current is mainly employed for the alternator stator winding protection against earth faults and phase-to-phase faults by use of circulating current principle. It function on the concept of...
Buchholz Relay
The Buchholz relay is a safety device which protects the transformer from internal incipient faults(slow developing faults such as insulation failure of winding, core heating, fall of oil level due to leaky joints etc..). It is...
Distance /Impedance relay
Relay Operation is governed by the ratio of applied voltage to current in the protected circuit. ie,the relay operates depending upon the impedance between the point of fault and the point where relay is...
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