Utility Contribution calculation
Utility Contribution calculation
(OP)
Hi,
How does utility companies calculate the 3-phase, line to ground fault utility contribution to a facility, as well as X/R ratio.
Suppose that this facility is powered from a 44 KV line and is 2000 KVA, 44kV/600V, delta-wye ground connected with a % impedance of 6%. Say the distance between the utility feed and the facility is 2.3 Km
How does utility companies calculate the 3-phase, line to ground fault utility contribution to a facility, as well as X/R ratio.
Suppose that this facility is powered from a 44 KV line and is 2000 KVA, 44kV/600V, delta-wye ground connected with a % impedance of 6%. Say the distance between the utility feed and the facility is 2.3 Km






RE: Utility Contribution calculation
Who owns the transformer and the line from the transformer to the facility?
RE: Utility Contribution calculation
RE: Utility Contribution calculation
RE: Utility Contribution calculation
RE: Utility Contribution calculation
RE: Utility Contribution calculation
Usually an infinity source it is assume in many practical applications. If not data is available rom the utility X/R=20 and the rating of the circuit breaker of the nerarest substation (40 kA) may be assumed.
See the enclosed link that show the graphically the effect of the utility SC available with the distance on the secondary feeder.
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RE: Utility Contribution calculation