The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Miro Milanovic - One of the best experts on this subject based on the ideXlab platform.

Zulkurnai Abdul-malek - One of the best experts on this subject based on the ideXlab platform.

  • Performance analysis of modified shifted current method for surge arrester condition monitoring
    2010 International Conference on High Voltage Engineering and Application, 2010
    Co-Authors: Zulkurnai Abdul-malek, Novizon Yusoff, Mohd Fairouz Mohd Yousof
    Abstract:

    The gapless zinc oxide surge arresters enable the utility personnel to measure the leakage current due to its gapless physical configuration. An arrester leakage current which comprises of capacitive and Resistive Components is such an important parameter to be analyzed because its third harmonic Resistive Component is known to be directly related to the ageing or the degradation of the zinc oxide arrester itself. Various methods can be applied to monitor the condition of the surge arresters both for in-field as well as inside a laboratory. The Resistive Component extraction method called the Modified Shifted Current Method (MSCM) is utilised in this work. A portable device consisting of a tablet computer is able to measure and store the leakage current data and therefore can be used for an in-situ arrester condition assessment. This paper describes the performance of the portable device when measurements of the arrester leakage current were conducted at the 132-kV transmission substations. The leakage current data were analyzed and summarized to indicate its performance in terms of the accuracy of assessments made on the arrester conditions in actual substation environment.

  • Portable device to extract Resistive Component of the metal oxide surge arrester leakage current
    2008 Australasian Universities Power Engineering Conference, 2008
    Co-Authors: Zulkurnai Abdul-malek
    Abstract:

    In practical applications of surge arrester degradation monitoring, an extraction method is usually required to extract the Resistive Component from the total measured leakage current. This paper describe the actual steps involved in the Resistive current waveshape-based method and implement the method using programs in Matlab as well as LabView. The LabView-based developed method promises a simplified metal-oxide surge arrester monitoring of Resistive leakage current since the program is ready to be implemented in a portable device.

  • A new method to extract the Resistive Component of the metal oxide surge arrester leakage current
    2008 IEEE 2nd International Power and Energy Conference, 2008
    Co-Authors: Zulkurnai Abdul-malek
    Abstract:

    Many studies have been conducted to monitor the degradation of MO arresters. The arresterpsilas leakage current, in particular, the third harmonic Component of the Resistive leakage current, is known to be directly related to the degree of degradation of the MO arrester. In order to extract the Resistive Component from the total leakage current, the voltage across the arrester terminals is usually measured as well. Although the measurement of total leakage current in substations or other installations can be easily done by using current shunts or current transformers, the measurement of voltage is relatively difficult if not prohibitive. Apart from the difficult and risky high voltage access for the voltage probe, the voltage measurement in a single phase may suffer from interference from nearby phases resulting in an unclean voltage reference. This paper introduces a new method to extract the Resistive current from the total leakage current without the need of the voltage signal. It is referred to as the Modified Shifted Current Method (MSCM). The new modified shifted current method of extracting Resistive current Component from the metal-oxide surge arrester leakage total current is shown to work well based on the simulated as well as experimental results. The new technique compares very well with the conventional compensation technique, especially for Resistive dominated leakage current waveforms. The new technique promises a simplified metal-oxide surge arrester monitoring of Resistive leakage current since no additional high voltage transducer, as in commercially available devices, is needed. The consequential benefits are reduced cost and safer working procedure for the maintenance staff.

  • Resistive Component extraction of leakage current in metal oxide surge arrester: A hybrid method
    Measurement, 1
    Co-Authors: Abdullah Munir, Zulkurnai Abdul-malek, Rai Naveed Arshad
    Abstract:

    Abstract Leakage current based condition monitoring is the most widely used method to ascertain the ageing of on-site Metal Oxide Surge Arrester (MOSA). The extraction of Resistive Component of leakage current is necessary for the exact health diagnostic of arrester. In particular, the third harmonic Component of Resistive current is known to be directly correlated with the ageing of arrester. Although, some existing methods are still used to extract the Resistive leakage current but their computational procedures and accuracies have some limitations. This paper is aimed to propose a newly developed technique, referred as hybrid method for the extraction of Resistive leakage current without acquiring the grid’s voltage. This method was developed on SIMULINK software and then validated experimentally on 120 kV rated MOSA manufactured by ABB. Results have shown that the proposed method is 3.2% more accurate than the modified shifted current method. It can be implemented to develop a highly precise condition monitoring module for online monitoring of MOSAs.

Vid Voncina - One of the best experts on this subject based on the ideXlab platform.

Niels Grønbech-jensen - One of the best experts on this subject based on the ideXlab platform.

Mohd Fairouz Mohd Yousof - One of the best experts on this subject based on the ideXlab platform.

  • Performance analysis of modified shifted current method for surge arrester condition monitoring
    2010 International Conference on High Voltage Engineering and Application, 2010
    Co-Authors: Zulkurnai Abdul-malek, Novizon Yusoff, Mohd Fairouz Mohd Yousof
    Abstract:

    The gapless zinc oxide surge arresters enable the utility personnel to measure the leakage current due to its gapless physical configuration. An arrester leakage current which comprises of capacitive and Resistive Components is such an important parameter to be analyzed because its third harmonic Resistive Component is known to be directly related to the ageing or the degradation of the zinc oxide arrester itself. Various methods can be applied to monitor the condition of the surge arresters both for in-field as well as inside a laboratory. The Resistive Component extraction method called the Modified Shifted Current Method (MSCM) is utilised in this work. A portable device consisting of a tablet computer is able to measure and store the leakage current data and therefore can be used for an in-situ arrester condition assessment. This paper describes the performance of the portable device when measurements of the arrester leakage current were conducted at the 132-kV transmission substations. The leakage current data were analyzed and summarized to indicate its performance in terms of the accuracy of assessments made on the arrester conditions in actual substation environment.

  • Field experience on surge arrester condition monitoring - Modified Shifted Current Method
    45th International Universities Power Engineering Conference UPEC2010, 2010
    Co-Authors: Zulkurnai Abdul-malek, Novizo Yusoff, Mohd Fairouz Mohd Yousof
    Abstract:

    The gapless surge arresters enable the utility personnel to measure the leakage current due to its gapless physical configuration. Arrester leakage current which comprises of capacitive and Resistive Components is such an important parameter to be analyzed because its third harmonic Resistive Component is known to be directly related to the ageing or the degradation of the metal-oxide arrester itself. Various methods nowadays can be applied to monitor the condition of the surge arresters both for on-line (on-site) and off-line (off-site). A new Resistive Component extraction method called the Modified Shifted Current Method (MSCM) is described in this work. This method has been applied to a newly developed portable device for easy on-site gapless surge arrester condition monitoring. This device consists of a tablet computer and is able to measure and store the leakage current data and is reliable for in-situ arrester condition assessment. Being newly developed and having tested inside the laboratory, this portable device was tested in the actual on-site application where the effects of various factors and interferences were studied. This paper describes the field experience of the portable device when measurement of the arrester leakage current were conducted at the 132-kV and above transmission substations. The leakage current data were analyzed and summarized to indicate its performance in terms of accuracy of assessment and in-situ decision made on the arrester conditions in actual substation environment.