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A distance relay is used to protect the transmission system shown below. The line impedance of each section is given below:
Line Impedance ( Ohms)1-2 6+j602-3 4+j402-4 5+j50
The rated voltage of the line is 500 kV. Assume a 1500:5 CT ratio and 4500:1
VT ratio at B12.
(a) Determine the settings Z1, Z2 & Z3 for the relay at B12.
(b) If the maximum current for line 1-2 is 1400A at 0.9 power factor lagging, verify that B12 does not trip for such current.
A three-phase overhead transmission line has a per-phase resistance of 0.15 ohm/km, and a per-phase inductance of 1.3263 mH/km.
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A 35-year old female worker receives an x-ray exposure of 5.2 rad (whole-body) while carrying out emergency procedures in a nuclear accident. Discuss the health risks assumed by this worker as a result of the radiation exposure.
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find the voltage E and the current Ir and IL in phasor form
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