Question

A synchronous generator and motor are rated for 30,000 kVA, 13.2 kV, and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000 kW at 0.8 power factor leading. The terminal voltage of the motor is 12.8 kV. When a symmetrical three-phase fault occurs at the motor terminals, find the subtransient current in the generator, motor, and at the fault point.

Name: a synchronous generator and motor are rated for 30000 kva 132kv and both have sub transient reactance of 20 the line connecting them has a reactance of 10 on the base of machine ratings the 66387
Uploaded: 2023-06-05T05:19:29-08:00
Duration: 6 min 25 s
Channel: Supreeta N
Description: a synchronous generator and motor are rated for 30000 kva 132kv and both have sub transient reactance of 20 the line connecting them has a reactance of 10 on the base of machine ratings the 66387

          A synchronous generator and motor are rated for 30,000 kVA, 13.2 kV, and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000 kW at 0.8 power factor leading. The terminal voltage of the motor is 12.8 kV. When a symmetrical three-phase fault occurs at the motor terminals, find the subtransient current in the generator, motor, and at the fault point.

Added by Matthew S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Supreeta N

06/05/2023

Step 1

First, we need to find the per-unit (pu) values for the given parameters. Base kVA = 30,000 kVA Base Voltage = 13.2 kV Base Impedance (Z_base) = (V_base^2) / S_base = (13.2^2) / 30,000 = 0.5808 ohms Show more…

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A synchronous generator and motor are rated for 30,000 kVA, 13.2 kV, and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000 kW at 0.8 power factor leading. The terminal voltage of the motor is 12.8 kV. When a symmetrical three-phase fault occurs at the motor terminals, find the subtransient current in the generator, motor, and at the fault point.