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If the per unit reactance of a power system up to the fault point is 0.1pu and base power (VA) is 10 MVA, then the fault level (VASC) is ut of O 100 MVA 2 MVA O 50 MVA O 500 MVA МacВook Air DII DD F11 F10 こ: F9 000 F7 F8 F6 F4 F5 * & 7 V 8 A9 a 5 0 6.

When plugging, as a general rule, the reversing contactor is of a larger size than the forward contactor because of the increased plugging current O True False

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Refer to figure 2. Calculate fault current

surge protector working principal

5-In transformers short circuit test primary voltage will be greater than secondary voltage.

Magnitude of Severity of fault is expressed in terms of Magnitude of Recovery Types of fault All of these the fault current voltage

ings of a 40 kVA, 6 m respectively. The le- ate (i) the primary vol ced (ii) the full-load re

c) Figure 4 (c) shows two (2) 11 kV/415V distribution transformers are connected using 2 incomings with sectionalizing breakers at HV and LV side. briefly summarize the switching procedure for maintenance personnel to shutdown the Transformer 2 for breaker servicing work at LV side and put back in-service. Supply line 1 Supply line 2 Disconnect switch Disconnect switch HV side breaker HV side breaker HV sectionilizing breaker HV busleection 1 HV bus section 2 Transformer 1 Transtormer 2 Indoor switchgear LV side breaker LV sectionilizing breaker LV bus section 1 LV bus section 2 Feeders breakers Outcoming feeders Figure 4 (c)