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Motor type Power rating (mechanical), Pc Rated line voltage, VL Induction, 3-phase 110 kW 400 V Frequency, fN 50 Hz Poles, NP 4 Rated speed, WR Rated current, IR Starting current ratio, Is/IR Nominal torque, гN 1491 rpm 194 A 7.9 Locked torque ratio, ПL/бN Efficiency at 100% load, ПMAX Power factor, PF 705 N.m 2.4 96.3% 0.85 A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. (ii) Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. (iii) Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.

Motor type Power rating (mechanical), Pc Rated line voltage, VL Induction, 3-phase 110 kW 400 V Frequency, fN 50 Hz Poles, NP 4 Rated speed, WR Rated current, IR Starting current ratio, Is/IR Nominal torque, гN 1491 rpm 194 A 7.9 Locked torque ratio, ПL/бN Efficiency at 100% load, ПMAX Power factor, PF 705 N.m 2.4 96.3% 0.85 A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. (ii) Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. (iii) Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.

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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Motor type Power rating (mechanical), Pc Rated line voltage, VL Induction, 3-phase 110 kW 400 V Frequency, fN 50 Hz Poles, NP 4 Rated speed, WR Rated current, IR Starting current ratio, Is/IR Nominal torque, гN 1491 rpm 194 A 7.9 Locked torque ratio, ПL/бN Efficiency at 100% load, ПMAX Power factor, PF 705 N.m 2.4 96.3% 0.85
Transcribed Image Text:Motor type Power rating (mechanical), Pc Rated line voltage, VL Induction, 3-phase 110 kW 400 V Frequency, fN 50 Hz Poles, NP 4 Rated speed, WR Rated current, IR Starting current ratio, Is/IR Nominal torque, гN 1491 rpm 194 A 7.9 Locked torque ratio, ПL/бN Efficiency at 100% load, ПMAX Power factor, PF 705 N.m 2.4 96.3% 0.85
A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. (ii) Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. (iii) Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.
Transcribed Image Text:A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. (ii) Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. (iii) Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.
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