EPE Association: NORpie 2006 - Topic 03: Industrial Applications

NORpie 2006 - Topic 03: Industrial Applications
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2006 > NORpie 2006 - Topic 03: Industrial Applications

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   Modelling the RF Signal Propagation in the Motor Feeder Cable
By A. Kosonen; J. Ahola; M. Jokinen [View]
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Abstract: The motivation for this work was the possibility of utilizing the motor feeder cable as a communication channel in the inverter driven electrical drives. The simulation of the data transmission and electromagnetic interference in the motor cable claims a model. The newest power line transmission methods utilize the frequency band up to 30 MHz. In this article, modelling RF (Radio Frequency) signal propagation in the motor feeder cable is discussed. The RF signal propagation is modelled in the inverter driven electrical drives. The simulation is concerned the frequency band 100 kHz – 30 MHz. The effect of each component is taken into account with a model or a measurement. The simulation model takes into consideration the frequency depending damping of the channel and the effect of the coupling interfaces and impedance mismatching. The laboratory experiments are carried out for proving the applicability of the proposed method. The channel model is a tool in developing the coupling interfaces to the power line modems. It also helps to estimate the data transfer rates and limitation in the motor cable.

   A New Approach to Current Differential Protection for Powerformer
By Q. Tian; X. Lin [View]
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Abstract: This paper presents a novel differential protection of Powerformer, a type of high-voltage graded insulated cable wound generator. The false differential current associated with the distributed capacitance of Powerformer stator windings is analyzed. Based on the investigation results, the winding capacitance can be equivalently arranged on the terminal and neutral of the generator respectively in a reasonable partition. And the phase voltages at the terminals are utilized to estimate the capacitive currents, which can be compensated to improve the sensitivity of the differential protection. Extensive simulation results prove that this compensation scheme can improve the reliability of the current differential protection of Powerformer.

   Transient Over Voltages in PWM Variable Speed AC Drives – Modeling and Analysis
By J.-P. Ström; M. Koski; H. Muittari; P. Silventoinen [View]
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Abstract: In this paper, transient motor over voltages caused by the operation of a pulse width modulation based variable speed AC drive utilizing IGBT semiconductor power switches are discussed. The voltage reflections occurring at the interconnecting power cable interfaces are analyzed using transmission line theory. Also, the most common solutions to the over voltage problem are presented. The frequency converter-interconnecting power cable-motor system is modeled using the Matlab Simulink package and the simulation results are compared to measured over voltage transients.

   Utilization of Ethernet Communications in Electric Drive Diagnostics – Requirements and Protocols
By R. Tiainen; A. Kämäri; V. Särkimäki; J. Ahola [View]
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Abstract: In this article, the utilization of Ethernet-based communication buses in electric drive condition monitoring and diagnostics is studied. The basic concepts of Ethernet are reviewed, and the requirements of embedded Ethernet are investigated. Concepts for diagnostics information management using protocols currently in use in computer networks are proposed.

   Analysis of the Requirements for an Inductively Coupled Power Supply for a Wireless Sensor
By V. Särkimäki; T. Ahonen; R. Tiainen; J. Ahola; T. Lindh [View]
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Abstract: The purpose of this work is to make analysis of the requirements for an inductively coupled power supply for a wireless sensor that is used in instrumentation of an electric motor. Focus is on ZigBee wireless technology and inductively coupled power supply, but also some general key points of powering a wireless sensor is given. Operation of the inductively coupled power supply is verified through laboratory tests.

NORpie 2006 - Topic 03: Industrial Applications
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2006 > NORpie 2006 - Topic 03: Industrial Applications
	[return to parent folder]

	Modelling the RF Signal Propagation in the Motor Feeder Cable By A. Kosonen; J. Ahola; M. Jokinen	[View] [Download]
Abstract: The motivation for this work was the possibility of utilizing the motor feeder cable as a communication channel in the inverter driven electrical drives. The simulation of the data transmission and electromagnetic interference in the motor cable claims a model. The newest power line transmission methods utilize the frequency band up to 30 MHz. In this article, modelling RF (Radio Frequency) signal propagation in the motor feeder cable is discussed. The RF signal propagation is modelled in the inverter driven electrical drives. The simulation is concerned the frequency band 100 kHz – 30 MHz. The effect of each component is taken into account with a model or a measurement. The simulation model takes into consideration the frequency depending damping of the channel and the effect of the coupling interfaces and impedance mismatching. The laboratory experiments are carried out for proving the applicability of the proposed method. The channel model is a tool in developing the coupling interfaces to the power line modems. It also helps to estimate the data transfer rates and limitation in the motor cable.

	A New Approach to Current Differential Protection for Powerformer By Q. Tian; X. Lin	[View] [Download]
Abstract: This paper presents a novel differential protection of Powerformer, a type of high-voltage graded insulated cable wound generator. The false differential current associated with the distributed capacitance of Powerformer stator windings is analyzed. Based on the investigation results, the winding capacitance can be equivalently arranged on the terminal and neutral of the generator respectively in a reasonable partition. And the phase voltages at the terminals are utilized to estimate the capacitive currents, which can be compensated to improve the sensitivity of the differential protection. Extensive simulation results prove that this compensation scheme can improve the reliability of the current differential protection of Powerformer.

	Transient Over Voltages in PWM Variable Speed AC Drives – Modeling and Analysis By J.-P. Ström; M. Koski; H. Muittari; P. Silventoinen	[View] [Download]
Abstract: In this paper, transient motor over voltages caused by the operation of a pulse width modulation based variable speed AC drive utilizing IGBT semiconductor power switches are discussed. The voltage reflections occurring at the interconnecting power cable interfaces are analyzed using transmission line theory. Also, the most common solutions to the over voltage problem are presented. The frequency converter-interconnecting power cable-motor system is modeled using the Matlab Simulink package and the simulation results are compared to measured over voltage transients.

	Utilization of Ethernet Communications in Electric Drive Diagnostics – Requirements and Protocols By R. Tiainen; A. Kämäri; V. Särkimäki; J. Ahola	[View] [Download]
Abstract: In this article, the utilization of Ethernet-based communication buses in electric drive condition monitoring and diagnostics is studied. The basic concepts of Ethernet are reviewed, and the requirements of embedded Ethernet are investigated. Concepts for diagnostics information management using protocols currently in use in computer networks are proposed.

	Analysis of the Requirements for an Inductively Coupled Power Supply for a Wireless Sensor By V. Särkimäki; T. Ahonen; R. Tiainen; J. Ahola; T. Lindh	[View] [Download]
Abstract: The purpose of this work is to make analysis of the requirements for an inductively coupled power supply for a wireless sensor that is used in instrumentation of an electric motor. Focus is on ZigBee wireless technology and inductively coupled power supply, but also some general key points of powering a wireless sensor is given. Operation of the inductively coupled power supply is verified through laboratory tests.