EPE Association: EPE 1997 – 56: Dialogue Session DS4g: MEASUREMENT TECHNIQUES AND SYSTEMS

EPE 1997 – 56: Dialogue Session DS4g: MEASUREMENT TECHNIQUES AND SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 56: Dialogue Session DS4g: MEASUREMENT TECHNIQUES AND SYSTEMS

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   COMBINED INSULATED CURRENT AND VOLTAGE MEASUREMENT SYSTEM FOR USE IN HIGH POWER CONVERTERS
By Dieter Eckardt [View]
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Abstract: A combined voltage and current measurement system is presented which is based on a coaxial shunt and designed for high insulation voltages. The measurement signals are amplified and AID-converted and the digital values are transmitted with optical fibres. The electric power necessary for supplying the sensor electronic which is placed inside the coaxial shunt is transmitted via laser-light.

   IMPLEMENTATION OF THE ADAPTIVE ANALOGUE FILTER IN VOLTAGE MEASUREMENT OF INDUCTION MACHINE
By V. Ambrozic; D. Nedeljkovic; J. Nastran [View]
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Abstract: A new method of adaptive analogue filtering, suitable for time-discrete (hysteresis) converters' voltage measurement (used in induction machines drives), is presented. The filters center frequency and bandwidth can be adjusted by a microprocessor. The amplified stator current components in a stationary reference frame are used as reference signals, thus requiring minimal CPU involvement.

   CIRCUITS FOR DIRECT CURRENT MEASUREMENT WITH IMPROVED LINEARITY AND ACCURACY
By P. Pejovic [View]
[Download]

Abstract: A class of simple circuits for direct current measurement applying a current transformer is proposed. The circuits arc based on nonlinear effects in ferromagnetic core of the current transformer, and provide information about the current magnitude and polarity. The circuits are analyzed applying piecewisc-linear model of the core magnetization curve. Averaged-circuit model and the circuit transfer function are derived. Good linearity and wide measurement range are obtained. Design guides to reduce of the output voltage ripple are given. Measurement error within 0.25% of the full scale is experimentally demonstrated.

   A Novel System for Current and Voltage Sensing in Traction Converters
By Mark Bakran; Rainer Marquardt; Axel Mertens; Stefan Winternheimer [View]
[Download]

Abstract: A novel transducer system for traction converters is introduced. The new concept takes full advantage of digital signal processing and the existing hardware of modern traction drive systems. It features direct measurement of voltages and of currents using a specially developed coaxial shunt, direct AID-conversion via a multi-bit-cr/o-converter implemented in an ASIC, and digital signal transmission including a new data compression method.

   DESIGN OF CURRENT SENSORS USING AMORPHOUS WIRES
By M. J. Prieto; F. Nuno; A M. Pernia; J. M. Lopera; J. Sebastian [View]
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Abstract: Nowadays, many applications in power electronics need current sensing (current mode control, current limiting, power factor correction, etc.). Although there are several ways to sense current -shunt resistors, current transformers or Hall-effect devices, for example-, a new family of current sensors based on amorphous wires is described here. A qualitative description of the physical phenomenon that makes amorphous wires suitable to measure current is included in this paper, as well as the reasons to choose the most adequate structure and sensing circuit for the sensor. The result is a 21 x l4 x 8mm-device ready to be mounted on a PCB (no extra circuitry needs to be added) and mainly intended to measure sense current.

   MEASUREMENT OF A TORQUE OF THE ELECTRICAL MACHINES ACCORDING TO THEIR ELECTRICAL PARAMETERS
By V. I. Smolin; D. V. Topolsky; N. N. Gudaev [View]
[Download]

Abstract: This paper describes a technique for measuring the torque of the de and ac machines with the error of 0.5 ... 3% only regarding their electrical parameters. In many cases a similar method of measurement simplifies a mechanical part of the torque meter and improves the dynamic characteristics.

   DEVELOPMENTS IN ROGOWSKI CURRENT TRANSDUCERS
By W. F. Ray; R. M. Davis [View]
[Download]

Abstract: A Rogowski current transducer is an invaluable tool for semi-conductor and power electronic circuit development since it is non-intrusive, does not saturate at high currents and has a very high bandwidth. This paper outlines the recent advances made in the transducer design and performance and the increasing range of applications.

   DESIGN CRITERIA AND PERFORMANCE ANALYSIS OF AC SIDE CURRENT CONTROL SYSTEM OF AC-to-DC CONVERTERS
By A. Draou [View]
[Download]

Abstract: This paper presents a new control scheme suitable for voltage type PWM ac to de converters and develop a stability analysis to accurately describe its behavior. Moreover, Converter analysis, design criteria, and stability analysis to determine an optimum set of feedback .coefficients are reported. The experimental results of the proposed system show that the transient waveforms are improved greatly and that the dynamic response can be made significantly quick.

EPE 1997 – 56: Dialogue Session DS4g: MEASUREMENT TECHNIQUES AND SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 56: Dialogue Session DS4g: MEASUREMENT TECHNIQUES AND SYSTEMS
	[return to parent folder]

	COMBINED INSULATED CURRENT AND VOLTAGE MEASUREMENT SYSTEM FOR USE IN HIGH POWER CONVERTERS By Dieter Eckardt	[View] [Download]
Abstract: A combined voltage and current measurement system is presented which is based on a coaxial shunt and designed for high insulation voltages. The measurement signals are amplified and AID-converted and the digital values are transmitted with optical fibres. The electric power necessary for supplying the sensor electronic which is placed inside the coaxial shunt is transmitted via laser-light.

	IMPLEMENTATION OF THE ADAPTIVE ANALOGUE FILTER IN VOLTAGE MEASUREMENT OF INDUCTION MACHINE By V. Ambrozic; D. Nedeljkovic; J. Nastran	[View] [Download]
Abstract: A new method of adaptive analogue filtering, suitable for time-discrete (hysteresis) converters' voltage measurement (used in induction machines drives), is presented. The filters center frequency and bandwidth can be adjusted by a microprocessor. The amplified stator current components in a stationary reference frame are used as reference signals, thus requiring minimal CPU involvement.

	CIRCUITS FOR DIRECT CURRENT MEASUREMENT WITH IMPROVED LINEARITY AND ACCURACY By P. Pejovic	[View] [Download]
Abstract: A class of simple circuits for direct current measurement applying a current transformer is proposed. The circuits arc based on nonlinear effects in ferromagnetic core of the current transformer, and provide information about the current magnitude and polarity. The circuits are analyzed applying piecewisc-linear model of the core magnetization curve. Averaged-circuit model and the circuit transfer function are derived. Good linearity and wide measurement range are obtained. Design guides to reduce of the output voltage ripple are given. Measurement error within 0.25% of the full scale is experimentally demonstrated.

	A Novel System for Current and Voltage Sensing in Traction Converters By Mark Bakran; Rainer Marquardt; Axel Mertens; Stefan Winternheimer	[View] [Download]
Abstract: A novel transducer system for traction converters is introduced. The new concept takes full advantage of digital signal processing and the existing hardware of modern traction drive systems. It features direct measurement of voltages and of currents using a specially developed coaxial shunt, direct AID-conversion via a multi-bit-cr/o-converter implemented in an ASIC, and digital signal transmission including a new data compression method.

	DESIGN OF CURRENT SENSORS USING AMORPHOUS WIRES By M. J. Prieto; F. Nuno; A M. Pernia; J. M. Lopera; J. Sebastian	[View] [Download]
Abstract: Nowadays, many applications in power electronics need current sensing (current mode control, current limiting, power factor correction, etc.). Although there are several ways to sense current -shunt resistors, current transformers or Hall-effect devices, for example-, a new family of current sensors based on amorphous wires is described here. A qualitative description of the physical phenomenon that makes amorphous wires suitable to measure current is included in this paper, as well as the reasons to choose the most adequate structure and sensing circuit for the sensor. The result is a 21 x l4 x 8mm-device ready to be mounted on a PCB (no extra circuitry needs to be added) and mainly intended to measure sense current.

	MEASUREMENT OF A TORQUE OF THE ELECTRICAL MACHINES ACCORDING TO THEIR ELECTRICAL PARAMETERS By V. I. Smolin; D. V. Topolsky; N. N. Gudaev	[View] [Download]
Abstract: This paper describes a technique for measuring the torque of the de and ac machines with the error of 0.5 ... 3% only regarding their electrical parameters. In many cases a similar method of measurement simplifies a mechanical part of the torque meter and improves the dynamic characteristics.

	DEVELOPMENTS IN ROGOWSKI CURRENT TRANSDUCERS By W. F. Ray; R. M. Davis	[View] [Download]
Abstract: A Rogowski current transducer is an invaluable tool for semi-conductor and power electronic circuit development since it is non-intrusive, does not saturate at high currents and has a very high bandwidth. This paper outlines the recent advances made in the transducer design and performance and the increasing range of applications.

	DESIGN CRITERIA AND PERFORMANCE ANALYSIS OF AC SIDE CURRENT CONTROL SYSTEM OF AC-to-DC CONVERTERS By A. Draou	[View] [Download]
Abstract: This paper presents a new control scheme suitable for voltage type PWM ac to de converters and develop a stability analysis to accurately describe its behavior. Moreover, Converter analysis, design criteria, and stability analysis to determine an optimum set of feedback .coefficients are reported. The experimental results of the proposed system show that the transient waveforms are improved greatly and that the dynamic response can be made significantly quick.