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Sub-transmission and distribution circuits are supplied in one of two configurations, 4 wire wye and 3 wire delta. The potential transformers used in these circuits must be properly selected based on the connected voltage, and properly wired to produce the required voltage at the meter or relay. 1. Use the following system voltages and configurations 1. 44,000V A 2. 27,600V A 3. 22,000V A 4. 27,000V Y 5. 14,400V Y 6. 12,270V Y Assume that for each option 120V is required at the connection to the relay. For each of the above: Calculate the exact ratio of the voltages appearing on the transformer, primary to secondary. Referring to the manufacturers' bulletins posted on Blackboard under Labs > Week 2, select a specific potential transformer, including catalog number that you would use for each application. (Pay attention to the number of primary bushings required.) For the selected device, calculate the exact secondary voltage that would appear at the relay with the system operating at rated primary voltage. 2. Produce a sketch of the potential transformer wiring diagram for a delta (3 wire) system, using an open delta PT configuration to connect to an SEL 451 relay. Show all connections, and label all phases and relay terminal numbers.

Sub-transmission and distribution circuits are supplied in one of two configurations, 4 wire wye and 3 wire delta. The potential transformers used in these circuits must be properly selected based on the connected voltage, and properly wired to produce the required voltage at the meter or relay. 1. Use the following system voltages and configurations 1. 44,000V A 2. 27,600V A 3. 22,000V A 4. 27,000V Y 5. 14,400V Y 6. 12,270V Y Assume that for each option 120V is required at the connection to the relay. For each of the above: Calculate the exact ratio of the voltages appearing on the transformer, primary to secondary. Referring to the manufacturers' bulletins posted on Blackboard under Labs > Week 2, select a specific potential transformer, including catalog number that you would use for each application. (Pay attention to the number of primary bushings required.) For the selected device, calculate the exact secondary voltage that would appear at the relay with the system operating at rated primary voltage. 2. Produce a sketch of the potential transformer wiring diagram for a delta (3 wire) system, using an open delta PT configuration to connect to an SEL 451 relay. Show all connections, and label all phases and relay terminal numbers.

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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Sub-transmission and distribution circuits are supplied in one of two configurations, 4 wire wye and 3 wire delta. The potential transformers used in these circuits must be properly selected based on the connected voltage, and properly wired to produce the required voltage at the meter or relay. 1. Use the following system voltages and configurations 1. 44,000V A 2. 27,600V A 3. 22,000V A 4. 27,000V Y 5. 14,400V Y 6. 12,270V Y Assume that for each option 120V is required at the connection to the relay. For each of the above: Calculate the exact ratio of the voltages appearing on the transformer, primary to secondary. Referring to the manufacturers' bulletins posted on Blackboard under Labs > Week 2, select a specific potential transformer, including catalog number that you would use for each application. (Pay attention to the number of primary bushings required.) For the selected device, calculate the exact secondary voltage that would appear at the relay with the system operating at rated primary voltage. 2. Produce a sketch of the potential transformer wiring diagram for a delta (3 wire) system, using an open delta PT configuration to connect to an SEL 451 relay. Show all connections, and label all phases and relay terminal numbers.
Transcribed Image Text:Sub-transmission and distribution circuits are supplied in one of two configurations, 4 wire wye and 3 wire delta. The potential transformers used in these circuits must be properly selected based on the connected voltage, and properly wired to produce the required voltage at the meter or relay. 1. Use the following system voltages and configurations 1. 44,000V A 2. 27,600V A 3. 22,000V A 4. 27,000V Y 5. 14,400V Y 6. 12,270V Y Assume that for each option 120V is required at the connection to the relay. For each of the above: Calculate the exact ratio of the voltages appearing on the transformer, primary to secondary. Referring to the manufacturers' bulletins posted on Blackboard under Labs > Week 2, select a specific potential transformer, including catalog number that you would use for each application. (Pay attention to the number of primary bushings required.) For the selected device, calculate the exact secondary voltage that would appear at the relay with the system operating at rated primary voltage. 2. Produce a sketch of the potential transformer wiring diagram for a delta (3 wire) system, using an open delta PT configuration to connect to an SEL 451 relay. Show all connections, and label all phases and relay terminal numbers.
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