What will be the residual voltage of the open delta winding

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Reference no: EM13952199

(a) What is meant by time grading in protective systems?

(b) In FIGURE 1, time graded relays control the circuit breakers. Which will have the shortest delay in operating for a fault at the location shown

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(c) A voltage transformer for use on an 11 kV system has a star connected primary. If the turns ratio is 100/1 what will be the residual voltage of the open delta winding?

(d) A 1 A electromagnetic relay has 80 turns on minimum setting. If the settings are from 50% to 200% in 25% steps, calculate the plug bridge turns for each setting. If the relay presents a burden of 3 VA determine the number of turns required if the relay was to operate at 12 V.

Reference no: EM13952199

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