Header Date Phenomenon of increasing load current THD Thomas Gsell xxx date Phenomenon: Increasing Load Current THD Measurement: Network Current MaxSine 100A should be sufficient! Rising THD due to Impedance, Slide 2 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 1 Header Date Phenomenon: Increasing Load Current THD Measurement: Network Current Sufficient compensation quality? Is MaxSine working well? Rising THD due to Impedance, Slide 3 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Measurement: MaxSine Current MaxSine is fully loaded! Rising THD due to Impedance, Slide 4 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 2 Header Date Phenomenon: Increasing Load Current THD Measurement: Load Current Did the load current increase? Test: Switch off MaxSine Rising THD due to Impedance, Slide 5 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Measurement: Load Current Did the load current increase? Insight: Harmonics increases with MaxSine Test: Switchload off MaxSine Rise MaxSine power to 200A ! Rising THD due to Impedance, Slide 6 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 3 Header Date Phenomenon: Increasing Load Current THD Measurement: Network Current Diagnosis: Sufficient compensation quality! Rising THD due to Impedance, Slide 7 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Measurement: MaxSine Current Rising THD due to Impedance, Slide 8 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 4 Header Date Phenomenon: Increasing Load Current THD Measurement: Load Current Test: Switch off MaxSine Rising THD due to Impedance, Slide 9 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Measurement: Load Current Rising THD due to Impedance, Slide 10 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 5 Header Date Phenomenon: Increasing Load Current THD Measurement: Load Current Harmonics load current increases more then 60% when MaxSine is working! Rising THD due to Impedance, Slide 11 Why??? © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Assumption: A non-linear load consists of an impedance as well as a harmonics current source. The load current ILD consists of a fundamental and a harmonics part: The admittance is the reciprocal of the impedance: The current of the current source IHarm is distributed to the network admittance as well as to the load admittance appropriate to their admittance values: Rising THD due to Impedance, Slide 12 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 6 Header Date Phenomenon: Increasing Load Current THD Assumption: A non-linear load consists of an impedance as well as a harmonics current source. The load current ILD consists of a fundamental and a harmonics part: The admittance is the reciprocal of the impedance: The current of the current source IHarm is distributed to the network admittance as well as to the load admittance appropriate to their admittance values: Rising THD due to Impedance, Slide 13 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Compensation equipment is installed in order to compensate the harmonics currents. The compensation current is equal to the harmonics load current: Rising THD due to Impedance, Slide 14 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 7 Header Date Phenomenon: Increasing Load Current THD Compensation equipment is installed in order to compensate the harmonics currents. The compensation current is equal to the harmonics load current: The network current now consist of fundamental current only: ( From this it follows that: ) Rising THD due to Impedance, Slide 15 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Phenomenon: Increasing Load Current THD Measurement: Load Current Calculation of the maximum harmonics load current IHarm if the network impedance is known: Rising THD due to Impedance, Slide 16 © ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circ umstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. Footer 8 Header Date www.alstom.com Footer 9
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