R. Heinrich

University of Missouri, Columbia, Missouri, United States

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Publications (10)3.31 Total impact

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    ABSTRACT: Based on experimental investigations a theoretical model of a sensor for partial discharge (PD) detection on high-voltage cross-linked polyethylene (XLPE)-insulated cables respectively joints has been developed. The model handles radial symmetric sensors and is based on the Finite-Difference Time-Domain (FDTD) method in which a cylindrical coordinate system is exploited. The calculation provides field values at each node of the FDTD grid. The field pattern in the cable and sensor at different time steps is used to investigate the coupling mechanism of the sensor. It is also used for parametric studies of the sensor, e. g. the dependence of the sensitivity on geometrical characteristics of the sensor, which is investigated theoretically as well as experimentally. Results of computer simulation are in a good agreement with experimental data derived for such sensors.
    European Transactions on Electrical Power 01/2007; 10(3):161-166. · 0.63 Impact Factor
  • D. Pommerenke, R. Jobava, R. Heinrich
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    ABSTRACT: In this second of a series of three papers, the authors investigate partial discharge (PD) detection and propagation in cable joints. The complex nature of cable joints leads to errors when PD analysis is carried out using conventional equivalent circuits. The authors use the finite difference time domain method to determine the transient electromagnetic fields caused by simulated PD in model cable joints.
    IEEE Electrical Insulation Magazine 12/2002; · 1.32 Impact Factor
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    ABSTRACT: An efficient and accurate FDTD simulation technique for investigation of field propagation in multi-layered coaxial cables has been developed. This technique combines a uniform FDTD scheme with the piecewise linear recursive convolution method, which is applied for the treatment of fields in dispersive layers, having extremely high permittivity. The method has been developed and tested for a radial symmetric cylindrical system and is intended for future use in 3D applications.
    Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2002. DIPED - 2002. Proceedings of the 7th International Seminar/Workshop on; 02/2002
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    D. Pommerenke, R. Jobava, R. Heinrich
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    ABSTRACT: This paper analyses the dependence of the output signals from different sensors as a function of partial discharge (PD) location using finite differences time domain (FDTD) modeling and compares their ability to quantify signals to the standard PD measurement method
    Dielectric Materials, Measurements and Applications, 2000. Eighth International Conference on (IEE Conf. Publ. No. 473); 02/2000
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    ABSTRACT: In this paper a simple and efficient method for the calculation of multi-layered coaxial cables is proposed. The parameters of an equivalent transmission line are calculated. These calculations are compared with FDTD results and measurements, and show a good agreement. The developed approach is especially suitable for fast and easy calculation of the propagation characteristics of multi-layered coaxial cables with high permittivity and conductivity, where other methods are less efficient
    Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2000. DIPED - 2000. Proceedings of the 5th International Seminar/Workshop on; 02/2000
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    ABSTRACT: Summary form only given. We introduce a 3D FDTD algorithm in cylindrical coordinates, which allows the investigation of the propagation of transient fields in high voltage cables and the interaction of these fields with directional coupler partial discharge (PD) sensors. The directional coupler sensors are modeled as 3D objects, consisting of a sensor electrode and 50 Ohm cables attached to this electrode for the signal output. The high voltage XLPE-insulated cable has an interface between the conductors and the electrical insulation, which is made of relatively thin semiconducting layers with extremely high permittivity, which is in range of 20 to 20000 for frequencies from 0.1 to 1000 MHz. These layers are represented by Debye media, the parameters of which are extracted from measurement data. A combination of the piecewise linear recursive convolution method (applied for dispersive components of the cable system) with the uniform FDTD algorithm gives an efficient and flexible tool for investigation of field propagation in XLPE cables
    Applied Electromagnetism, 2000. Proceedings of the Second International Symposium of Trans Black Sea Region on; 02/2000
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    ABSTRACT: Because of several technical and economical advantages XLPE (cross-linked polyethylene)-insulated power cable systems are increasingly used in the high voltage (HV) and extremely high voltage (EHV) range. High voltage XLPE-insulated cables consist of a copper or aluminium conductor (inner conductor), a semiconducting layer extruded over the inner conductor, an XLPE-insulation, an outer semiconducting layer, a metallic wire screen or aluminum sheath and an outer polyethylene sheath. The extruded semiconducting layers provide a well bonded and smooth interface between the conductors and the dielectric, avoiding electric field strength enhancements, which would lead to partial discharge and a premature breakdown. However, the XLPE-insulation is very sensitive to partial discharges (PD). To ensure the reliability of the whole cable system, sensitive laboratory PD tests before installation and on-site verification are required. One common method to detect PD is the measurement of the radiated fields of the PD with sensitive field sensors. These sensors couple PD signals through the outer semiconducting layer and therefore the properties of the semiconducting layer have a significant influence on the coupling mechanisms. Knowing the conductivity and permittivity and their dependence on frequency and temperature is important to optimise PD field sensors. Those sensors are usually placed above the outer semicon layer close to or within cable joints. This paper presents a measurement set-up to determine the frequency dependent conductivity and permittivity of small samples taken from the outer semicon layer of different medium and high voltage cables. The measurement set-up can handle extremely high, frequency dependent dielectric constants, which are typical for semiconducting materials (carbon black filled polymers). Besides, the temperature of the sample can be adjusted from 10°C to 85°C to study the temperature dependence of the properties of the semicon sample
    Dielectric Materials, Measurements and Applications, 2000. Eighth International Conference on (IEE Conf. Publ. No. 473); 02/2000
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    ABSTRACT: On-site partial discharge (PD) measurement is required to ensure proper installation of extra high voltage (EHV) cable systems accessories. To achieve high sensitivity and good localization, two problems have to be overcome. First, the strong high frequency in long XLPE cables requires that the sensors be located along the cable, preferably directly at the accessories. Secondly, the detection system must be able to distinguish internal PD from other pulses. This paper describes a solution based on directional coupling sensors and a data visualization system, which displays phase-amplitude diagrams for individual PD sources which are identified by the direction of pulse propagation. It has been applied to on-site measurements, type and routine testing of HV cable joints and stress cones. Due to the reliable discrimination between internal PD from the accessory measured and from other pulses, testing can be done in unshielded rooms even using terminations with internal PD and corona. The method works independently well on line voltage, resonance sources, oscillating voltages and 0.1 Hz cosine-square voltage. It has been used to verify the cable accessories installed in the 6.3 km long 380 kV cable system in Berlin, Germany
    IEEE Transactions on Dielectrics and Electrical Insulation 01/2000; · 1.36 Impact Factor
  • P. Craatz, R. Plath, R. Heinrich, W. Kalkner
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    ABSTRACT: To verify the reliability of 110 kV XLPE cable joints a long term prequalification test was carried out at IPH. 12 joints of various manufacturers were integrated in a circular 110 kV XLPE cable test loop. The short distances between the joints required selective PD measurement and localisation location to measure PD from each joint separately. Therefore directional coupler sensors (DCS) were integrated at each joint to provide a sensitive and unequivocal PD measurement and localisation
    High Voltage Engineering, 1999. Eleventh International Symposium on (Conf. Publ. No. 467); 02/1999
  • [Show abstract] [Hide abstract]
    ABSTRACT: Based on the experimental investigations a simple theoretical model for the simulation of partial discharge (PD) detection on high voltage XLPE-insulated cables has been developed. The model handles radial symmetric sensors. The dependence of sensitivity on geometrical characteristics of the sensor is investigated experimentally and theoretically. Results of computer simulation are in a good agreement with experimental data derived for such sensors
    Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 1998. DIPED-98. Proceedings of III International Seminar/Workshop on; 12/1998

Publication Stats

57 Citations
3.31 Total Impact Points

Institutions

  • 2002
    • University of Missouri
      Columbia, Missouri, United States
    • The University of Georgia (Tbilisi)
      Tbilsi, T'bilisi, Georgia
  • 2000
    • Ivane Javakhishvili Tbilisi State University
      • Department of Physics
      Tbilsi, T'bilisi, Georgia
  • 1998–2000
    • Technische Universität Berlin
      Berlín, Berlin, Germany