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. A commercial office building is to be supplied service at 208Y/120 V from the utilıty company 12.47 kV distribution feeder (12.47 kV line-to-line and 7.2 kV line-to- neutral). The estimated demand load is 85 kW at 0.9 lagging power factor. Determine the appropriate apparent power rating and voltage rating of the three-phase, pad-mounted transformer required to serve this load. The transformer is connected delta-grounded wye. Assume the load is continuous and allow a 25% factor for load growth.

. A commercial office building is to be supplied service at 208Y/120 V from the utilıty company 12.47 kV distribution feeder (12.47 kV line-to-line and 7.2 kV line-to- neutral). The estimated demand load is 85 kW at 0.9 lagging power factor. Determine the appropriate apparent power rating and voltage rating of the three-phase, pad-mounted transformer required to serve this load. The transformer is connected delta-grounded wye. Assume the load is continuous and allow a 25% factor for load growth.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Transformer Problem (see attached picture).  Use given tables (see attached picture).

TABLE 14-3 Standard kVA Ratings for Pad- Mounted Transformers Single Phase Three Phase 25 75 37.5 112.5 50 150 75 225 100 300 167 500 750 1000 1500 2000 2500 Source: Reprinted from American National Standard C57.12.21-1980 by permission of the National Electrical Manufacturers Association. TABLE 14-4 Standard Voltage Ratings for Pad-Mounted Transformers Single Phase Three Phase 2400 4160GRDY/2400 8320GRDY/4800 4160 4800 12,000GRDY/6930 12,470GRDY/7200 13,200GRDY/7620 13,800GRDY/7970 16,430GRDY/9430 22,860GRDY/13,200 23,900GRDY/13,800 34,500GRDY/19,920 7200 12,000 12,470 13,200 13,800 16,340 22,860GRDY/13,200 23,900GRDY/13,800 24,940GRDY/14,400 34,500GRDY/19,920 208Y/120 240/120 240 480 480Y/277
Transcribed Image Text:TABLE 14-3 Standard kVA Ratings for Pad- Mounted Transformers Single Phase Three Phase 25 75 37.5 112.5 50 150 75 225 100 300 167 500 750 1000 1500 2000 2500 Source: Reprinted from American National Standard C57.12.21-1980 by permission of the National Electrical Manufacturers Association. TABLE 14-4 Standard Voltage Ratings for Pad-Mounted Transformers Single Phase Three Phase 2400 4160GRDY/2400 8320GRDY/4800 4160 4800 12,000GRDY/6930 12,470GRDY/7200 13,200GRDY/7620 13,800GRDY/7970 16,430GRDY/9430 22,860GRDY/13,200 23,900GRDY/13,800 34,500GRDY/19,920 7200 12,000 12,470 13,200 13,800 16,340 22,860GRDY/13,200 23,900GRDY/13,800 24,940GRDY/14,400 34,500GRDY/19,920 208Y/120 240/120 240 480 480Y/277
1. A commercial office building is to be supplied service at 208Y/120 V from the utilıty company 12.47 kV distribution feeder (12.47 kV line-to-line and 7.2 kV line-to- neutral). The estimated demand load is 85 kW at 0.9 lagging power factor. Determine the appropriate apparent power rating and voltage rating of the three-phase, pad-mounted transformer required to serve this load. The transformer is connected delta-grounded wye. Assume the load is continuous and allow a 25% factor for load growth.
Transcribed Image Text:1. A commercial office building is to be supplied service at 208Y/120 V from the utilıty company 12.47 kV distribution feeder (12.47 kV line-to-line and 7.2 kV line-to- neutral). The estimated demand load is 85 kW at 0.9 lagging power factor. Determine the appropriate apparent power rating and voltage rating of the three-phase, pad-mounted transformer required to serve this load. The transformer is connected delta-grounded wye. Assume the load is continuous and allow a 25% factor for load growth.
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