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A three-phase, 230 V, 72 kVA, 0.9 pf (lagging) load is supplied by three 29 KVA, 1330/230 V, 60 Hz transformers connected in Yd5 by means of a common three-phase feeder with an impedance of 0.003+j0.015 ohms per phase. The transformers are supplied from a three-phase source (substation) through a three-phase line with an impedance of 0.55+j4.6 ohms per phase. The equivalent impedance (Rsc +jXsc) of one or the single-phase transformers referred to the low-voltage side is 0.16+j0.32 ohms. (a) Deter- mine the required supply voltage if the load voltage is 230 V. (b) Determi voltage

A three-phase, 230 V, 72 kVA, 0.9 pf (lagging) load is supplied by three 29 KVA, 1330/230 V, 60 Hz transformers connected in Yd5 by means of a common three-phase feeder with an impedance of 0.003+j0.015 ohms per phase. The transformers are supplied from a three-phase source (substation) through a three-phase line with an impedance of 0.55+j4.6 ohms per phase. The equivalent impedance (Rsc +jXsc) of one or the single-phase transformers referred to the low-voltage side is 0.16+j0.32 ohms. (a) Deter- mine the required supply voltage if the load voltage is 230 V. (b) Determi voltage

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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A three-phase, 230 V, 72 kVA, 0.9 pf (lagging) load is supplied by three 29 KVA, 1330/230 V, 60 Hz transformers connected in Yd5 by means of a common three-phase feeder with an impedance of 0.003+j0.015 ohms per phase. The transformers are supplied from a three-phase source (substation) through a three-phase line with an impedance of 0.55+j4.6 ohms per phase. The equivalent impedance (Rsc+jXsc) of one or the single-phase transformers referred to the low-voltage side is 0.16+j0.32 ohms. (a) Deter- mine the required supply voltage if the load voltage is 230 V. (b) Determine the voltage regulation. Single-line diagram showing the substation, line, transformer, feeder and load. line feeder Ⓒ| ### + @ ### substation Yd5 (a) Required substation supply voltage : (b) Voltage regulation: %. load volts.
Transcribed Image Text:A three-phase, 230 V, 72 kVA, 0.9 pf (lagging) load is supplied by three 29 KVA, 1330/230 V, 60 Hz transformers connected in Yd5 by means of a common three-phase feeder with an impedance of 0.003+j0.015 ohms per phase. The transformers are supplied from a three-phase source (substation) through a three-phase line with an impedance of 0.55+j4.6 ohms per phase. The equivalent impedance (Rsc+jXsc) of one or the single-phase transformers referred to the low-voltage side is 0.16+j0.32 ohms. (a) Deter- mine the required supply voltage if the load voltage is 230 V. (b) Determine the voltage regulation. Single-line diagram showing the substation, line, transformer, feeder and load. line feeder Ⓒ| ### + @ ### substation Yd5 (a) Required substation supply voltage : (b) Voltage regulation: %. load volts.
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