Question

Determine RRRV for (a) Grounded fault (b) Ungrounded fault if in a short circuit test on a 220 kV, three phase circuit breaker having earthed neutral has the following results Fault p.f = 0.4, recovery voltage = 0.9 of full line value Breaking current is symmetrical and the restriking transient of natural frequency 18 kHz.

          Determine RRRV for (a) Grounded fault
(b) Ungrounded fault if in a short circuit test
on a 220 kV, three phase circuit breaker
having earthed neutral has the following
results
Fault p.f = 0.4, recovery voltage = 0.9 of full
line value
Breaking current is symmetrical and the
restriking transient of natural frequency 18
kHz.

Determine RRRV for (a) Grounded fault
(b) Ungrounded fault if in a short circuit test
on a 220 kV, three phase circuit breaker
having earthed neutral has the following
results
Fault p.f = 0.4, recovery voltage = 0.9 of full
line value
Breaking current is symmetrical and the
restriking transient of natural frequency 18
kHz.

Added by Jeremy V.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Justin Swantek

Step 1

Since the circuit breaker has an earthed neutral, the fault current will flow through the neutral and cause a voltage drop across the neutral impedance. To determine the RRRV (Recovery Rate of Rise of Restriking Voltage) for a grounded fault, we need to consider Show more…

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Determine RRRV for (a) Grounded fault (b) Ungrounded fault if in a short circuit test on a 220 kV, three-phase circuit breaker having earthed neutral has the following results: Fault p.f = 0.4, recovery voltage = 0.9 of full line value. Breaking current is symmetrical and the restriking transient of natural frequency 18 kHz.